Updated materials to reflect new projections received from management on 12/21/18: Includes updated Base and Downside Cases and additional Upside Case Financing assumptions updated with $600mm of Term Loan debt issued to financed transaction vs. $550mm in prior materials Updating after-tax analysis [pending data request from company regarding future allocated net income] Price updated to January 2, 2019 Updated AM Trading Comparables Updated Trading Comparables for Q3 Removed VLP from Trading Comparables as a result of the announced buy-in by VLO Regrouped EQM and WES into “Single E&P Sponsored” Added OMP given updated higher growth rate and relative size Added ETRN to AMGP Trading Comparables given the ETRN spinoff completed 11/13/2018, the announced acquisition of EQGP for $20.00 cash/unit on 11/30/2018 and, subsequent to the GP buy-in, the announced simplification of EQM and PF ETRN Updated PF AMGP Trading Comparbles Removed EQM from PF AMGP Trading Comparables given updated lower growth rate Added OMP given higher growth rate and relative size Added PSXP given growth rate Updated Transaction Comparables, including premiums paid analysis, to include select transactions announced since last meeting Updated cost of capital group based on updates to comparable company group Red page numbers reflect respective page number in prior materials to the extent they are different than this version Prior vs. Current Since October 8, 2018 Special Committee Meeting 4

Proposal Component Description Consideration Each Non-AR AM Common Unit to receive: 1.6350 AMGP shares $3.415 Cash For each common unit held, AR to receive: 1.6023 AMGP shares $3.00 Cash Series B Elimination Series B units will be exchanged for 17.354mm AMGP shares (total pro forma AMGP shares of 508.2mm) Implies ~$297mm valuation at market close as of October 8, 2018 and $198mm on January 2, 2019 Newly issued AMGP shares will vest on the same schedule as Series B units Unvested new AMGP shares do not accrue dividends Pro Forma Ownership AM Unitholders: ~59.9% Governance PF AMGP will be reestablished as a Delaware C-corp 9-member independent, Board of Directors with no more than 4 appointed by AR, the Sponsors or Management AR, the Sponsors, and Management agree to vote in support of independent directors nominated by the Nominations & Governance Committee or in proportion to the votes cast by public stockholders Summary of Project Alpine Transaction 5 (2) _____________________________________ Source: Company filings, FactSet as of 1/2/2019. Implied all-in XR calculated as equity XR of 1.6350x plus $3.415 cash consideration divided by current AMGP share price. Premium to unaffected date of 2/23/2018 prior to Special Committee formation announcement on 2/26/2018. Fully diluted share count including full Series B vesting of 17.354mm shares. (3) 4 (1) Transaction Premiums Implied Offer Current Implied Offer Premium 2/23/2018 10/8/2018 1/2/2019 10/8/2018 1/2/2019 2/23/2018 10/8/2018 1/2/2019 Spot AM Price $26.49 $29.48 $21.98 $31.41 $22.04 (16.8%) (25.2%) 0.3% Spot AMGP Price $19.19 $17.12 $11.39 -- -- -- -- -- Spot XR 1.3804x 1.7220x 1.9298x 1.8326x 1.9175x 38.9% 11.4% (0.6%)

Antero Entities Ownership Overview Organizational Structure Overview Antero Resources (“AR”) Antero Midstream GP LP (“AMGP”) Antero Midstream Partners LP (“AM”) Public Shareholders Public Unitholders Sponsors 72% 19% 47% LP 100% IDRs 53% LP Public Shareholders 38% 42% Antero Midstream Partners GP LLC 100% Antero IDR Holdings (“IDR LLC”) 100% Series A Units 100% Series B Units Management _____________________________________ Source: Company filings, FactSet as of 1/2/2019. 2/3 remain unvested, with 50% of those (1/3 of total) vesting 12/31/18 and the final 50% of those (1/3 of total) vesting 12/31/19. Value based on 6% of AMGP equity value above $2,000mm. AR net debt consolidates AM. Non-Econ GP Management Management 9% 20% ($ in millions, unless otherwise noted) 6 5 Metric AR AM AMGP Price (as of 1/2/2019) $9.76 $21.98 $11.39 Fully Dilluted Shares O/S 322 187 186 Market Equity Value 3,140 4,111 2,120 GP Equity Value - 2,128 - Total Equity Value 3,140 6,239 2,120 Net Debt (2) 5,366 1,192 (4) Series B Value - - 7 Total Enterprise Value $8,506 $7,431 $2,123 Value of AM Units Held $2,175 Sponsor/Managenent Ownership x AR AM AMGP - Series A AMGP - Series B (1) Total # Shares (000s) Value ($MM) % Outstanding # Units (000s) Value ($MM) % Outstanding # Shares (000s) Value ($MM) % Outstanding Units (000s) Value ($MM) % Outstanding Total Aggregate Investment Warburg Pincus LLC 46,609 $455 14.7% - - - 55,110 $628 29.6% - - - $1,083 Yorktown Partners LLC 12,905 $126 4.1% - - - 15,534 $177 8.3% - - - $303 Total Sponsor 59,514 $581 18.8% - - - 70,644 $805 37.9% - - - $1,385 Paul Rady 16,350 $160 5.2% 303 $7 0.2% 19,997 $228 10.7% 48 $4 48.7% $398 Glen Warren 10,823 $106 3.4% 207 $5 0.1% 14,931 $170 8.0% 32 $2 32.5% $283 Other 3 $0 0.0% 353 $8 0.2% 2,937 $33 1.6% 19 $1 18.9% $43 Total Management 29,787 $265 8.6% 863 $19 0.5% 37,865 $431 20.3% 99 $7 100.0% $723 TOTAL 89,301 $846 27.3% 863 $19 0.5% 108,509 $1,236 58.3% 99 $7 100.0% $2,108

AM Selected Comparable Company Analysis ___________________________________ Source: FactSet as of 1/2/2019 and Wall Street research. Note: On November 8, 2018, WES and WGP announced a simplification agreement. On November 8, 2018, WES and WGP announced a simplification agreement. On November 30th, 2018, Equitrans Midstream (ETRN) announced the acquisition of EQGP for $20.00 cash/unit and, subsequent to the GP buy-in, ETRN announced the proposed simplification of EQM and PF ETRN. Note: AM at Mgmt. Estimates represents mgmt. projections under AR Base Case. Values GP and IDR cash flow at LP yield for MLPs with non-public GPs. Defined as high-growth MLP if current – 2020E distribution growth CAGR is greater than 10%. Based on Wall Street consensus estimates as compiled by FactSet. Antero Midstream Partners LP announced on February 26, 2018 that its Board of Directors had formed a special committee, in conjunction with the formation of special committees at both Antero Resources and Antero Midstream GP, to evaluate potential measures and transactions that could involve Antero Midstream. Implied unit prices are calculated based on Management projections under AR Base Case. (7) (3,4) Single E&P Spon. High Growth MLP (5) (5) 11 9 A B C D E F G H I J K L M Dist. Growth LP Distribution / Unit / Price / Enterprise Value / Unit Price at Total Equity Enterprise 2018E to % Dist. Price (Yield) DCF / LP Unit EBITDA 2019E Company 1/2/2019 Market Value (1) Value 2020E CAGR to GP/IDRs Current 2019E 2019E 2020E 2019E 2020E Coverage EQT Midstream Partners LP $43.66 $10,350 $13,823 9% 35% 10.2% 11.0% 8.7x 6.5x 10.6x 8.1x 1.05x Western Gas Partners, L.P. 42.93 11,211 15,706 6% 36% 9.0% 9.5% 8.4x 7.8x 10.7x 9.5x 1.24x BP Midstream Partners LP 16.02 1,743 2,023 15% 0% 7.3% 8.1% 9.7x 8.5x 9.4x 7.4x 1.42x CNX Midstream Partners LP 16.40 1,214 1,726 15% 14% 8.5% 9.6% 7.1x 5.9x 7.3x 6.2x 1.53x Hess Midstream Partners LP 17.62 987 3,287 15% 3% 8.1% 9.2% 9.9x 9.0x 9.5x 8.0x 1.13x Noble Midstream Partners LP 29.67 1,254 2,513 20% 6% 7.5% 8.8% 7.0x 5.0x 8.4x 7.1x 1.94x Oasis Midstream Partners LP 17.25 515 1,082 20% 0% 10.0% 11.7% 5.3x 4.8x 7.5x 6.3x 1.84x Phillips 66 Partners LP 42.72 8,861 12,429 10% 39% 7.0% 8.1% 10.6x 9.9x 10.1x 8.7x 1.21x Shell Midstream Partners LP 17.12 5,421 7,336 11% 29% 8.9% 10.0% 8.4x 8.3x 8.8x 7.4x 1.19x Mean $4,617 $6,658 13% 18% 8.5% 9.6% 8.4x 7.3x 9.2x 7.6x 1.39x Median $1,743 $3,287 15% 14% 8.5% 9.5% 8.4x 7.8x 9.4x 7.4x 1.24x Low $515 $1,082 6% 0% 7.0% 8.1% 5.3x 4.8x 7.3x 6.2x 1.05x High $11,211 $15,706 20% 39% 10.2% 11.7% 10.6x 9.9x 10.7x 9.5x 1.94x Single E&P Sponsored Mean $10,780 $14,764 7% 35% 9.6% 10.2% 8.6x 7.1x 10.6x 8.8x 1.15x Single E&P Sponsored Median $10,780 $14,764 7% 35% 9.6% 10.2% 8.6x 7.1x 10.6x 8.8x 1.15x High - Growth MLP Mean $2,856 $4,342 15% 13% 8.2% 9.4% 8.3x 7.3x 8.7x 7.3x 1.46x High - Growth MLP Median $1,254 $2,513 15% 6% 8.1% 9.2% 8.4x 8.3x 8.8x 7.4x 1.42x AM at WSC $21.98 $6,239 $7,431 28% 31% 8.0% 10.0% 7.6x 6.6x 8.0x 6.3x 1.19x AM at Mgmt. Estimates $21.98 $6,239 $7,431 29% 31% 8.0% 10.1% 9.0x 7.4x 8.3x 6.5x 1.10x Metric Multiple Range Implied Unit Price Metric Multiple Range Implied Unit Price AM at Mgmt. AM at WSC Low Median High Low Median High AM at Mgmt. AM at WSC Low Median High Low Median High 2019E EBITDA $892 $932 7.3x 9.4x 10.7x $17.14 $26.86 $33.25 2019E LP DCF / Unit $2.44 $2.88 5.3x 8.4x 10.6x $12.93 $20.55 $25.83 2020E EBITDA $1,143 $1,184 6.2x 7.4x 9.5x $20.01 $27.53 $40.15 2020E LP DCF / Unit $2.97 $3.31 4.8x 7.8x 9.9x $14.32 $23.17 $29.39 LP Distribution / Unit Yield Range Implied Unit Price AM at Mgmt. AM at WSC Low Median High Low Median High 2019E Distribution Yield $2.21 $2.20 11.7% 9.5% 8.1% $18.87 $23.31 $27.17

Precedents MLP Transactions Analysis ___________________________________ Source: Company filings, press releases, presentations and FactSet for pricing data. Represents precedent MLP transactions by affiliated and third party MLPs, Public GPs and C-Corps since 2011. Note: Considers transactions where target is an MLP. Based on Wall Street research. Non-adjusted transaction TEV values affiliated and non-affiliated units at offer price. Adjusted transaction TEV value affiliated units at market price and non-affiliated units at offer price. Illustrative transaction value for PF AMGP at Transaction includes conversion of Series B units, AM existing debt, and the purchase of AM units outstanding. Excludes transaction fees. AM public unitholder premium to current XR of 1.9298x. At Transaction 12 (4) 10 A B C D E F G H I J K L M Announcement Transaction TEV / FY1 Adj. Transaction Adj. TEV / FY1 Deal 1-Day Taxable Buyer Transaction Date Value EBITDA (1,2) Value (1,3) EBITDA (1,3) Value Premium Transaction Type Type 11/26/18 Dominion Energy Inc Dominion Energy Midstream Partners LP $3,598 11.6x $3,584 11.5x $1,262 0.9% 0% No C-Corp Affiliate 11/26/18 Arclight Capital TransMontaigne Partners L.P. 1,247 9.0x 1,232 8.9x 536 12.6% 100% No C-Corp Affiliate 11/8/18 Western Gas Equity Partners LP Western Gas Partners, LP 12,781 10.6x 12,603 10.4x 5,763 7.6% 0% No C-Corp Affiliate 10/22/18 EnLink Midstream LLC EnLink Midstream Partners, L.P. 12,236 11.8x 12,221 11.8x 5,084 1.1% 0% Yes C-Corp Affiliate 10/18/18 Valero Energy Corporation Valero Energy Partners LP 3,788 11.2x 3,734 11.0x 1,976 6.0% 100% Yes C-Corp Affiliate 9/18/18 Enbridge Inc. Enbridge Energy Partners 15,562 10.0x 15,541 10.0x 2,742 2.1% 0% Yes C-Corp Affiliate 8/24/18 Enbridge Inc. Spectra Energy Partners, LP 27,810 12.0x 26,945 11.6x 3,276 5.7% 0% Yes C-Corp Affiliate 8/1/18 Energy Transfer Equity, L.P. Energy Transfer Partners 66,981 8.9x 66,915 8.9x 27,179 11.2% 0% No MLP Affiliate 6/19/18 Cheniere Energy Inc. Cheniere Energy Partners LP Holdings 5,651 10.7x 5,526 10.4x 1,240 2.2% 0% No C-Corp Affiliate 5/17/18 Williams Companies Williams Partners, LP 57,793 12.6x 56,013 12.2x 10,427 6.4% 0% Yes C-Corp Affiliate 3/26/18 Tall Grass Energy GP, LP Tallgrass Energy Partners, LP 8,361 12.0x 8,083 11.6x 1,686 0.6% 0% Yes C-Corp Affiliate 2/7/18 Terra Nitrogen GP, Inc. Terra Nitrogen Co. LP 1,474 7.0x 1,432 6.8x 387 3.7% 100% Yes C-Corp Affiliate 1/2/18 Archrock, Inc Archrock Partners, LP 2,438 9.6x 2,358 9.3x 607 23.4% 0% Yes C-Corp Affiliate 8/29/17 Zenith Energy US, LP Arc Logistics Partners LP 736 12.9x 736 12.9x 407 15.2% 100% Yes MLP 3rd Party 10/25/16 Energy Transfer Partners, LP PennTex Midstream Partners, LP 789 10.3x 789 10.3x 640 43.3% 50% Yes MLP Affiliate 3/2/17 VTTI, B.V VTTI Energy Partners, LP 1,867 9.2x 1,842 9.1x 481 6.0% 100% Yes C-Corp Affiliate 4/3/17 World Point Terminals, Inc. World Point Terminals, LP 594 9.1x 570 8.8x 159 5.8% 100% Yes C-Corp Affiliate 2/1/17 ONEOK, Inc ONEOK Partners, LP 23,654 12.0x 22,380 11.4x 9,309 25.8% 0% Yes C-Corp Affiliate 1/27/17 Enbridge Energy Company Midcoast Energy Partners, LP 1,176 11.4x 1,194 11.6x 170 (8.6%) 100% Yes C-Corp Affiliate 11/21/16 Sunoco Logistics Partners, LP Energy Transfer Partners, LP 54,455 9.7x 54,455 9.7x 21,965 (0.2%) 0% No MLP Affiliate 10/24/16 American Midstream Partners LP JP Energy Partners LP 476 8.6x 476 8.6x 302 9.1% 0% No MLP 3rd Party 9/26/16 Transcanada Columbia Pipeline Partners 3,464 4.9x 3,384 4.8x 915 11.1% 100% Yes C-Corp Affiliate 5/30/16 SemGroup Corp. Rose Rock Midstream 2,034 12.0x 2,034 12.0x 771 0.0% 0% Yes C-Corp Affiliate 11/3/15 Targa Resources Corp. Targa Resources Partners LP 12,229 10.6x 12,138 10.5x 6,672 18.4% 0% Yes C-Corp Affiliate 8/1/16 Transocean, Inc Transocean Partners 1,202 3.5x 1,153 3.3x 259 20.8% 0% No C-Corp Affiliate 10/26/15 Western Refining, Inc. Northern Tier Energy 5,286 11.8x 5,185 11.5x 1,982 11.7% 65% Yes C-Corp 3rd Party 7/13/15 MPLX LP MarkWest Energy Partners, LP 22,360 22.8x 22,360 22.8x 16,612 36.3% 8% No MLP 3rd Party 5/6/15 Crestwood Equity Partners, LP Crestwood Midstream Partners 6,920 11.9x 6,901 11.9x 3,381 17.2% 0% No MLP Affiliate 4/6/15 Tesoro Logistics LP QEP Midstream Partners LP 1,145 7.5x 1,104 7.2x 394 8.6% 0% No MLP Affiliate 1/26/15 Energy Transfer Partners, LP Regency Energy Partners LP 18,593 11.0x 18,593 11.0x 11,276 13.2% 1% No MLP Affiliate 10/26/14 Williams Partners LP Access Midstream Partners LP 34,256 10.5x 34,256 10.5x 21,944 (0.2%) 0% No MLP Affiliate 10/13/14 Targa Resources Partners LP Atlas Pipeline Partners LP 6,002 17.5x 6,002 17.5x 3,866 15.0% 3% No MLP 3rd Party 11/12/14 Enterprise Products Partners LP Oiltanking Partners LP 4,289 23.0x 4,243 22.8x 1,392 1.7% 0% No MLP Affiliate 8/10/14 Kinder Morgan Inc. Kinder Morgan Energy Partners 52,566 8.8x 52,351 8.8x 27,351 12.0% 12% Yes C-Corp Affiliate 8/10/14 Kinder Morgan Inc. El Paso Pipeline Partners 13,677 11.9x 13,193 11.4x 5,421 15.4% 12% Yes C-Corp Affiliate 7/24/14 Breitburn Energy Partners QR Energy LP 2,856 9.4x 2,856 9.4x 1,811 17.5% 19% No MLP 3rd Party 10/10/13 Regency Energy Partners LP PVR Partners LP 5,659 13.5x 5,659 13.5x 3,931 25.7% 1% No MLP 3rd Party 8/27/13 Plains All American LP PAA Natural Gas Storage LP 2,531 20.1x 2,434 19.4x 755 8.5% 0% No MLP Affiliate 5/6/13 Inergy Midstream LP Crestwood Midstream Partners LP 2,643 14.6x 2,643 14.6x 1,661 14.5% 4% No MLP 3rd Party 1/29/13 Kinder Morgan Energy Partners LP Copano Energy LLC 4,858 14.9x 4,858 14.9x 3,911 23.5% 0% No MLP 3rd Party 2/23/11 Enterprise Products Partners Duncan Energy Partners LP 3,282 9.5x 2,973 8.6x 1,006 28.1% 0% No MLP Affiliate Median $4,375 10.7x $5,185 10.5x $1,686 6.0% 0% Mean 12,092 10.1x 11,509 9.9x 3,847 8.3% 34% Median $4,970 10.6x $4,885 10.5x $1,539 7.0% 0% Mean 14,326 10.7x 14,130 10.5x 5,513 9.7% 24% Median $4,858 13.2x $3,857 13.2x $1,896 15.1% 6% Mean 5,653 13.5x 5,201 13.5x 3,502 18.1% 30% Median $4,573 11.0x $4,858 11.0x $1,811 11.1% 0% Mean 12,715 11.5x 12,267 11.3x 5,144 11.7% 24% Premium to Current Antero Midstream GP LP Antero Midstream Partners LP $7,988 9.0x -- -- -- (0.6%) 7% Yes C-Corp Affiliate At Announcement (10/8/2018) Antero Midstream GP LP Antero Midstream Partners LP $10,933 11.1x -- -- -- 6.4% 5% Yes C-Corp Affiliate Overall 3rd Party % Cash Affiliate Acquiror Target C-Corp Buying MLP

AM DCF Analysis AR Base Volumes Case Valuation Effective Date: 12/31/2018 Discounted Levered DCF Analysis Levered DCF Attributable to AM LP Unitholders Discounted Distribution Analysis Distributions Attributable to LP Unitholders Discounted Levered DCF Analysis Supplemental Calculation Detail Discounted Distribution Analysis Supplemental Calculation Detail ___________________________________ Source: Management projections and FactSet as of 1/2/2019. 13 11 2019E 2020E 2021E 2022E LP DCF per Unit $2.44 $2.97 $3.54 $3.89 Discount Factor 0.954 0.867 0.788 PV of LP DCF per Unit $2.32 $2.57 $2.79 Disc. LP DCF Total $7.69 Terminal Multiple 8.5x Terminal Disc. Factor 0.751 Implied Terminal Value per Unit $24.85 Implied Value per Unit $32.54 2019E 2020E 2021E 2022E LP Distribution Per Unit $2.21 $2.85 $3.42 $3.76 Discount Factor 0.954 0.867 0.788 PV of LP Dist. per Unit $2.11 $2.47 $2.70 Disc. LP Dist. Total $7.28 Terminal Yield 9.0% Terminal Disc. Factor 0.751 Implied Terminal Value per Unit $31.39 Implied Value per Unit $38.66 2022E DCF Multiple ##### 7.0x 8.5x 10.0x 8.0% $29.54 $34.17 $38.81 10.0% $28.16 $32.54 $36.93 12.0% $26.87 $31.02 $35.18 Discount Rate 2022E Distribution Yield ##### 10.0% 9.0% 8.0% 8.0% $37.34 $40.65 $44.80 10.0% $35.52 $38.66 $42.59 12.0% $33.84 $36.81 $40.53 Discount Rate

AM DCF Analysis AR Downside Volumes Case Valuation Effective Date: 12/31/2018 Discounted Levered DCF Analysis Levered DCF Attributable to AM LP Unitholders Discounted Distribution Analysis Distributions Attributable to LP Unitholders Discounted Levered DCF Analysis Supplemental Calculation Detail Discounted Distribution Analysis Supplemental Calculation Detail ___________________________________ Source: Management projections and FactSet as of 1/2/2019. 15 13 2019E 2020E 2021E 2022E LP DCF per Unit $2.44 $2.77 $3.42 $3.68 Discount Factor 0.954 0.867 0.788 PV of LP DCF per Unit $2.32 $2.40 $2.70 Disc. LP DCF Total $7.42 Terminal Multiple 8.5x Terminal Disc. Factor 0.751 Implied Terminal Value per Unit $23.53 Implied Value per Unit $30.95 2019E 2020E 2021E 2022E LP Distribution Per Unit $2.21 $2.58 $2.97 $3.42 Discount Factor 0.954 0.867 0.788 PV of LP Dist. per Unit $2.11 $2.23 $2.34 Disc. LP Dist. Total $6.68 Terminal Yield 9.0% Terminal Disc. Factor 0.751 Implied Terminal Value per Unit $28.55 Implied Value per Unit $35.23 2022E Distribution Yield ##### 10.0% 9.0% 8.0% 8.0% $34.02 $37.04 $40.81 10.0% $32.38 $35.23 $38.80 12.0% $30.84 $33.55 $36.93 Discount Rate 2022E DCF Multiple ##### 7.0x 8.5x 10.0x 8.0% $28.11 $32.49 $36.88 10.0% $26.79 $30.95 $35.10 12.0% $25.57 $29.51 $33.44 Discount Rate

AM DCF Analysis AR Upside Volumes Case Valuation Effective Date: 12/31/2018 Discounted Levered DCF Analysis Levered DCF Attributable to AM LP Unitholders Discounted Distribution Analysis Distributions Attributable to LP Unitholders Discounted Levered DCF Analysis Supplemental Calculation Detail Discounted Distribution Analysis Supplemental Calculation Detail ___________________________________ Source: Management projections and FactSet as of 1/2/2019. 17 2019E 2020E 2021E 2022E LP DCF per Unit $2.42 $2.90 $3.74 $4.16 Discount Factor 0.954 0.867 0.788 PV of LP DCF per Unit $2.31 $2.52 $2.95 Disc. LP DCF Total $7.77 Terminal Multiple 8.5x Terminal Disc. Factor 0.751 Implied Terminal Value per Unit $26.56 Implied Value per Unit $34.34 2019E 2020E 2021E 2022E LP Distribution Per Unit $2.21 $2.85 $3.42 $4.10 Discount Factor 0.954 0.867 0.788 PV of LP Dist. per Unit $2.11 $2.47 $2.70 Disc. LP Dist. Total $7.28 Terminal Yield 9.0% Terminal Disc. Factor 0.751 Implied Terminal Value per Unit $34.23 Implied Value per Unit $41.50 2022E DCF Multiple ##### 7.0x 8.5x 10.0x 8.0% $31.12 $36.07 $41.02 10.0% $29.65 $34.34 $39.02 12.0% $28.28 $32.72 $37.16 Discount Rate 2022E Distribution Yield ##### 10.0% 9.0% 8.0% 8.0% $40.04 $43.65 $48.17 10.0% $38.08 $41.50 $45.78 12.0% $36.26 $39.50 $43.55 Discount Rate

AMGP Selected Comparable Company Analysis ___________________________________ Source: FactSet as of 1/2/2019 and Wall Street research. Note: Implied GP value calculated as the equity value of GP - equity value of the LP units held + net debt held by the GP. Note: On November 8, 2018, WES and WGP announced a simplification agreement. On November 30th, 2018, Equitrans Midstream (ETRN) announced the acquisition of EQGP for $20.00 cash/unit and, subsequent to the GP buy-in, ETRN announced the proposed simplification of EQM and PF ETRN. Total entity distribution yield calculated as GP distribution per unit / share over current GP unit / share price. Total entity enterprise value calculated as the equity value of GP + net debt held by the GP. GP EBITDA calculated as total distributions to the GP. For AMGP, EBITDA calculated as total distributions to IDR, LLC less Series B payments. Implied GP equity value calculated as GP share / unit price times GP shares outstanding. Cash available for distribution (CAFD) calculated as GP EBITDA less interest expense and maintenance capex. Antero Midstream Partners LP announced on February 26, 2018 that its Board of Directors had formed a special committee, in conjunction with the formation of special committees at both Antero Resources and Antero Midstream GP, to evaluate potential measures and transactions that could involve Antero Midstream. Implied share prices are calculated based on Management projections. “Total HoldCo Distributions with Series B Conversion” calculated as HoldCo distributions with post-tax Series B payments added back in over (AMGP FD S/O + 17.3mm Series B converted units). Representative of 91% interest in EQGP. On November 30. 2018, Equitrans Midstream made an all-cash offer of $20 per unit for all outstanding EQGP units, representing a ~17% premium to the latest closing price. Since that time EQGP equity has remained at ~$20 per unit while Equitrans Equity Value has declined ~13%. (4) (5) (5) (6) 20 16 (7) (8) Series B Metric Multiple Range Implied Total Entity Share Price Metric Multiple Range Implied GP Share Price AMGP at Mgmt. Estimates AMGP at WSC Low Median High Low Median High AMGP at Mgmt. Estimates AMGP at WSC Low Median High Low Median High With Series B Conversion 2019E EBITDA $235 $233 11.1x 13.4x 15.3x $12.81 $15.50 $17.70 2019E CAFD $165 $176 11.2x 11.5x 15.2x $9.08 $9.32 $12.34 Series B Total HoldCo Distributions Yield Range Implied Total Entity Share Price AMGP at Mgmt. Estimates AMGP at WSC Low Median High Low Median High With Series B Conversion 2019E Distribution Yield $174 $173 9.0% 9.0% 7.1% $9.48 $9.52 $12.14 A B C D E F G H I J K L M Total Entity Distribution / Unit / Total Entity Enterprise Value / Implied GP Equity Value / Unit Price at Total Entity Total Entity Implied GP Implied GP Price (Yield) (1) GP EBITDA (2) CAFD (3) 2018E - 2020E Company 1/2/2019 Equity Value TEV Equity Value TEV Current 2019E 2019E 2020E 2019E 2020E Dist. CAGR Equitrans Midstream LLC $20.01 $5,088 $4,910 $4,420 $4,242 8.2% 9.0% 11.1x 9.9x 11.5x 10.2x 13.8% EQT GP Holdings LP 19.98 6,044 6,672 5,091 5,090 6.3% 7.1% 15.3x 13.6x 15.2x 13.4x 15.1% Western Gas Equity Partners, LP 28.26 6,188 7,523 4,044 4,061 8.4% 9.0% 13.4x 11.7x 11.2x 9.4x 8.8% Mean $5,773 $6,368 $4,519 $4,464 7.6% 8.4% 13.2x 11.7x 12.6x 11.0x 12.6% Median $6,044 $6,672 $4,420 $4,242 8.2% 9.0% 13.4x 11.7x 11.5x 10.2x 13.8% Low $5,088 $4,910 $4,044 $4,061 6.3% 7.1% 11.1x 9.9x 11.2x 9.4x 8.8% High $6,188 $7,523 $5,091 $5,090 8.4% 9.0% 15.3x 13.6x 15.2x 13.4x 15.1% AMGP at WSC $11.39 $2,120 $2,123 $2,120 $2,123 5.1% 7.7% 13.0x 9.7x 15.0x 9.1x 57.3% AMGP at Mgmt Estimates $11.39 $2,120 $2,123 $2,120 $2,123 5.1% 7.8% 9.5x 6.3x 12.8x 8.5x 57.3%

AMGP DCF Analysis AR Base Volumes Case AMGP with Series B Value Conversion Valuation Effective Date: 12/31/2018 Discounted Levered DCF(1) Analysis Distributions Attributable to IDR, LLC Before Series B Payments Discounted Distribution Analysis Pre-Series B Payment AMGP Distributions 1.0x Coverage SQ AM Distribution Policy Discounted Levered DCF(1) Analysis Supplemental Calculation Detail Discounted Distribution Analysis Supplemental Calculation Detail ___________________________________ Source: Management projections and FactSet as of 1/2/2019. AMGP discounted DCF defined as HoldCo DCF with Series B payments added back in. Discounted cost of equity at 10.0%. Adj. GP distribution per share calculated as (AMGP DCF + Series B payment added back) / (fully diluted AMGP shares outstanding + 17.354mm converted Series B units). 21 17 2022E CAFD Multiple $22 11.0x 12.5x 14.0x 8.0% $20.52 $22.85 $25.18 10.0% $19.50 $21.71 $23.91 12.0% $18.55 $20.64 $22.73 Discount Rate 2022E Distribution Yield ##### 9.0% 8.0% 7.0% 8.0% $20.69 $22.85 $25.62 10.0% $19.67 $21.71 $24.33 12.0% $18.71 $20.64 $23.13 Discount Rate 2019E 2020E 2021E 2022E HoldCo DCF $177 $269 $350 $398 Discount Factor 0.954 0.867 0.788 PV of GP FCF $169 $233 $276 Disc. IDR Distribution Total $678 Terminal Multiple 12.5x Terminal Disc. Factor 0.751 Implied Equity Value $4,419 AMGP Shares O/S (Inclusive of 17.354mm Series B Conversion Shares) 203.6 Implied Equity Value per Share $21.71 2019E 2020E 2021E 2022E Adj. GP Dist. Per Share (2) $0.87 $1.32 $1.72 $1.96 Discount Factor 0.954 0.867 0.788 PV of GP Dist. per Share $0.83 $1.14 $1.35 Disc. Adj. Dist. Total $3.33 Terminal Yield 8.0% Terminal Disc. Factor 0.751 Implied Terminal Value per Share $18.38 Implied Equity Value per Share $21.71

AMGP DCF Analysis AR Downside Volumes Case AMGP with Series B Value Conversion Valuation Effective Date: 12/31/2018 Discounted Levered DCF(1) Analysis Distributions Attributable to IDR, LLC Before Series B Payments Discounted Distribution Analysis Pre-Series B Payment AMGP Distributions 1.0x Coverage SQ AM Distribution Policy Discounted Levered DCF(1) Analysis Supplemental Calculation Detail Discounted Distribution Analysis Supplemental Calculation Detail ___________________________________ Source: Management projections and FactSet as of 1/2/2019. AMGP discounted IDR distribution defined as HoldCo DCF with Series B payments added back in. Discounted cost of equity at 10.0%. Adj. GP distribution per share calculated as (AMGP DCF + Series B payment added back) / (fully diluted AMGP shares outstanding + 17.354mm converted Series B units). 23 19 2022E CAFD Multiple $19 11.0x 12.5x 14.0x 8.0% $18.01 $20.06 $22.10 10.0% $17.12 $19.06 $20.99 12.0% $16.29 $18.13 $19.96 Discount Rate 2022E Distribution Yield ##### 9.0% 8.0% 7.0% 8.0% $18.16 $20.06 $22.49 10.0% $17.26 $19.06 $21.36 12.0% $16.43 $18.13 $20.31 Discount Rate 2019E 2020E 2021E 2022E HoldCo DCF $177 $229 $286 $350 Discount Factor 0.954 0.867 0.788 PV of GP FCF $169 $199 $225 Disc. IDR Distribution Total $593 Terminal Multiple 12.5x Terminal Disc. Factor 0.751 Implied Equity Value $3,879 AMGP Shares O/S (Inclusive of 17.354mm Series B Conversion Shares) 203.6 Implied Equity Value per Share $19.06 2019E 2020E 2021E 2022E Adj. GP Dist. Per Share (2) $0.87 $1.13 $1.40 $1.72 Discount Factor 0.954 0.867 0.788 PV of GP Dist. per Share $0.83 $0.98 $1.11 Disc. Adj. Dist. Total $2.92 Terminal Yield 8.0% Terminal Disc. Factor 0.751 Implied Terminal Value per Share $16.14 Implied Equity Value per Share $19.06

AMGP DCF Analysis AR Upside Volumes Case AMGP with Series B Value Conversion Valuation Effective Date: 12/31/2018 Discounted Levered DCF(1) Analysis Distributions Attributable to IDR, LLC Before Series B Payments Discounted Distribution Analysis Pre-Series B Payment AMGP Distributions 1.0x Coverage SQ AM Distribution Policy Discounted Levered DCF(1) Analysis Supplemental Calculation Detail Discounted Distribution Analysis Supplemental Calculation Detail ___________________________________ Source: Management projections and FactSet as of 1/2/2019. AMGP discounted DCF defined as HoldCo DCF with Series B payments added back in. Discounted cost of equity at 10.0%. Adj. GP distribution per share calculated as (AMGP DCF + Series B payment added back) / (fully diluted AMGP shares outstanding + 17.354mm converted Series B units). 25 2022E CAFD Multiple $24 11.0x 12.5x 14.0x 8.0% $22.60 $25.21 $27.83 10.0% $21.47 $23.94 $26.42 12.0% $20.42 $22.76 $25.10 Discount Rate 2022E Distribution Yield ##### 9.0% 8.0% 7.0% 8.0% $22.79 $25.21 $28.32 10.0% $21.65 $23.94 $26.89 12.0% $20.59 $22.76 $25.55 Discount Rate 2019E 2020E 2021E 2022E HoldCo DCF $177 $269 $350 $447 Discount Factor 0.954 0.867 0.788 PV of GP FCF $169 $233 $276 Disc. IDR Distribution Total $678 Terminal Multiple 12.5x Terminal Disc. Factor 0.751 Implied Equity Value $4,874 AMGP Shares O/S (Inclusive of 17.354mm Series B Conversion Shares) 203.6 Implied Equity Value per Share $23.94 2019E 2020E 2021E 2022E Adj. GP Dist. Per Share (2) $0.87 $1.32 $1.72 $2.19 Discount Factor 0.954 0.867 0.788 PV of GP Dist. per Share $0.83 $1.14 $1.35 Disc. Adj. Dist. Total $3.33 Terminal Yield 8.0% Terminal Disc. Factor 0.751 Implied Terminal Value per Share $20.61 Implied Equity Value per Share $23.94

Analysis at Transaction Value ___________________________________ Source: Company filings, and FactSet as for 1/2/2019. Includes Series B units exchanged for 17.354mm AMGP shares DCF attributable to the LP unitholders. DCF multiples based on total all-in implied equity consideration for AM public and AR. Each Public AM Common Unit to receive: 1.6350 AMGP shares, $3.415 Cash. For each common unit held, AR to receive: 1.6023 AMGP shares and $3.00 Cash. ($ in millions, unless otherwise noted) AR Downside Volumes Case AR Base Case 28 AR Upside Volumes Case 22 A B C D E F 10/8 At Transaction (3) Current At Transaction (3) All-in Exchange Ratio to Public (At Current AMGP Sh. Price of $11.39) 1.8324x 1.9175x Premium to Implied AM Unit Price to Public (AMGP Share Price x All-in XR) 6.4% (0.6%) Implied AM Unit Price to Public $31.37 $21.84 Fully Diluted AM Units Outstanding Owned by Public 88.2 88.2 Implied Fully-Diluted AM Equity Value Owned by Public $2,766 $1,926 Total Implied Fully-Diluted AM Equity Value $5,805 $4,033 AM Net Debt / (Cash) 1,633 1,633 AMGP Net Debt / (Cash) - - Implied AMGP Equity Value (1) $2,319 $2,319 Implied AM Enterprise Value $9,757 $7,985 Comparable Metrics AM Trading Transaction Multiples: Statistic Median Median (NTM) 2019E EBITDA $892 10.9x 9.0x 9.4x 10.9x 2020E EBITDA $1,143 8.5x 7.0x 7.4x 2019E DCF (2) $456 12.7x 8.8x 8.4x 2020E DCF (2) $555 10.5x 7.3x 7.8x Current Yield to Public $1.76 5.6% 8.1% 8.5% 2019E EBITDA $892 10.9x 9.0x 2020E EBITDA $1,051 9.3x 7.6x 2019E DCF (2) $456 12.7x 8.8x 2020E DCF (2) $517 11.2x 7.8x Current Yield to Public $1.76 5.6% 8.1% 2019E EBITDA $892 10.9x 9.0x 2020E EBITDA $1,128 8.6x 7.1x 2019E DCF (2) $453 12.8x 8.9x 2020E DCF (2) $543 10.7x 7.4x Current Yield to Public $1.76 5.6% 8.1%

Contribution Analysis AR Base Case AMGP DCF Contribution Based On Actual Forecasted Taxes (Including on Series B Cash Flow) Contribution Analysis Implied Ownership Implied Exchange Ratio Series B Adjusted(1,2) AMGP AM 29 29 ___________________________________ Source: Management projections. FactSet as of 1/2/2019. Note: AM DCF calculated as LP Interest in EBITDA less interest expense, maintenance capex, and tax withholding reimbursements paid to AR. AMGP DCF calculated as IDR DCF from AM to IDR LLC less G&A and cash taxes plus post-tax Series B payments. Note: AM distributions calculated as distributions attributable to LP unitholders. AMGP distributions defined as distributions attributable to IDR, LLC less taxes paid on full distributions available to IDR, LLC less G&A. Note: Cash tax shield from Series B depreciation of ~$6mm per year. Implied exchange ratios utilize adjusted AMGP share count of fully diluted AMGP shares outstanding + 17.354mm converted Series B units. At Transaction: 1.6350x XR and $3.415 cash consideration / unit. At Transaction (Current): 1.9175x 23 3.175x 2.428x 2.242x 2.078x 1.941x 1.881x 5.334x 3.199x 2.518x 2.160x 1.997x 1.931x 2017A DCF 2018E DCF 2019E DCF 2020E DCF 2021E DCF 2022E DCF 2017A Distributions 2018E Distributions 2019E Distributions 2020E Distributions 2021E Distributions 2022E Distributions 76.0% 70.8% 69.2% 67.5% 66.0% 65.3% 82.9% 76.2% 71.6% 68.4% 66.6% 65.9% 24.0% 29.2% 30.8% 32.5% 34.0% 34.7% 17.1% 23.8% 28.4% 31.6% 33.4% 34.1% 2017A DCF 2018E DCF 2019E DCF 2020E DCF 2021E DCF 2022E DCF 2017A Distributions 2018E Distributions 2019E Distributions 2020E Distributions 2021E Distributions 2022E Distributions

Contribution Analysis AR Downside Volumes Case AMGP DCF Contribution Based On Actual Forecasted Taxes (Including on Series B Cash Flow) Contribution Analysis Implied Ownership Implied Exchange Ratio Series B Adjusted(1,2) ___________________________________ Source: Management projections. FactSet as of 1/2/2019. Note: AM DCF calculated as LP Interest in EBITDA less interest expense, maintenance capex, and tax withholding reimbursements paid to AR. AMGP DCF calculated as IDR DCF from AM to IDR LLC less G&A and cash taxes plus post-tax Series B payments. Note: AM distributions calculated as distributions attributable to LP unitholders. AMGP distributions defined as distributions attributable to IDR, LLC less taxes paid on full distributions available to IDR, LLC less G&A. Note: Cash tax shield from Series B depreciation of ~$6mm per year. Implied exchange ratios utilize adjusted AMGP share count of fully diluted AMGP shares outstanding + 17.354mm converted Series B units. At Transaction: 1.6350x XR and $3.415 cash consideration / unit. AMGP AM 30 At Transaction (Current): 1.9175x 24 3.175x 2.428x 2.242x 2.118x 1.882x 1.883x 5.334x 3.199x 2.518x 2.280x 2.118x 1.997x 2017A DCF 2018E DCF 2019E DCF 2020E DCF 2021E DCF 2022E DCF 2017A Distributions 2018E Distributions 2019E Distributions 2020E Distributions 2021E Distributions 2022E Distributions 76.0% 70.8% 69.2% 67.9% 65.3% 65.3% 82.9% 76.2% 71.6% 69.5% 67.9% 66.6% 24.0% 29.2% 30.8% 32.1% 34.7% 34.7% 17.1% 23.8% 28.4% 30.5% 32.1% 33.4% 2017A DCF 2018E DCF 2019E DCF 2020E DCF 2021E DCF 2022E DCF 2017A Distributions 2018E Distributions 2019E Distributions 2020E Distributions 2021E Distributions 2022E Distributions

Contribution Analysis AR Upside Case AMGP DCF Contribution Based On Actual Forecasted Taxes (Including on Series B Cash Flow) Contribution Analysis Implied Ownership Implied Exchange Ratio Series B Adjusted(1,2) ___________________________________ Source: Management projections. FactSet as of 1/2/2019. Note: AM DCF calculated as LP Interest in EBITDA less interest expense, maintenance capex, and tax withholding reimbursements paid to AR. AMGP DCF calculated as IDR DCF from AM to IDR LLC less G&A and cash taxes plus post-tax Series B payments. Note: AM distributions calculated as distributions attributable to LP unitholders. AMGP distributions defined as distributions attributable to IDR, LLC less taxes paid on full distributions available to IDR, LLC less G&A. Note: Cash tax shield from Series B depreciation of ~$6mm per year. Implied exchange ratios utilize adjusted AMGP share count of fully diluted AMGP shares outstanding + 17.354mm converted Series B units. At Transaction: 1.6350x XR and $3.415 cash consideration / unit. AMGP AM 31 At Transaction (Current): 1.9175x 3.175x 2.428x 2.255x 2.122x 1.864x 1.860x 5.334x 3.199x 2.518x 2.160x 1.997x 1.879x 2017A DCF 2018E DCF 2019E DCF 2020E DCF 2021E DCF 2022E DCF 2017A Distributions 2018E Distributions 2019E Distributions 2020E Distributions 2021E Distributions 2022E Distributions 76.0% 70.8% 69.3% 68.0% 65.1% 65.0% 82.9% 76.2% 71.6% 68.4% 66.6% 65.3% 24.0% 29.2% 30.7% 32.0% 34.9% 35.0% 17.1% 23.8% 28.4% 31.6% 33.4% 34.7% 2017A DCF 2018E DCF 2019E DCF 2020E DCF 2021E DCF 2022E DCF 2017A Distributions 2018E Distributions 2019E Distributions 2020E Distributions 2021E Distributions 2022E Distributions

Implied Exchange Ratios(1) AM & AMGP AR Base Volumes Case AR Downside Volumes Case Discounted Levered DCF Approach Discounted Levered DCF Approach ___________________________________ Source: Management projections. FactSet as of 1/2/2019. Note: AM distributable cash flow defined as distributable cash flow attributable to AM LP unitholders. AMGP distributable cash flow defined as HoldCo DCF with pre-tax Series B payments added back in. AMGP share values based on Shares Outstanding including 17.354mm additional shares from Series B conversion. Low AM to high AMGP and high AM to low AMGP implied unit and share prices compared to assess full range of potential exchange ratios. Discounted Distribution Approach Discounted Distribution Approach PV of Future Share Price PV of Future Share Price At Transaction (Current): 1.9175x 32 Discounted Levered DCF Approach Discounted Distribution Approach PV of Future Share Price AR Upside Volumes Case 25 Implied XR Low Med High 8.0% 1.457x 1.779x 2.165x 10.0% 1.460x 1.781x 2.166x 12.0% 1.463x 1.783x 2.166x Discount Rate Implied XR Low Med High 8.0% 1.513x 1.847x 2.247x 10.0% 1.516x 1.849x 2.248x 12.0% 1.519x 1.851x 2.248x Discount Rate PV of FSP at 10% Discount Rate YE 2019 YE 2020 YE 2021 Low 1.977x 1.847x 1.803x Mid 1.951x 1.821x 1.778x High 1.918x 1.790x 1.747x Implied XR Low Med High 8.0% 1.272x 1.620x 2.048x 10.0% 1.276x 1.624x 2.050x 12.0% 1.281x 1.628x 2.053x Discount Rate Implied XR Low Med High 8.0% 1.173x 1.496x 1.891x 10.0% 1.178x 1.499x 1.894x 12.0% 1.182x 1.503x 1.896x Discount Rate PV of FSP at 10% Discount Rate YE 2019 YE 2020 YE 2021 Low 2.087x 1.963x 1.872x Mid 2.060x 1.936x 1.846x High 2.026x 1.903x 1.813x Implied XR Low Med High 8.0% 1.414x 1.731x 2.114x 10.0% 1.416x 1.733x 2.114x 12.0% 1.419x 1.735x 2.115x Discount Rate PV of FSP at 10% Discount Rate YE 2019 YE 2020 YE 2021 Low 1.977x 1.847x 1.756x Mid 1.951x 1.821x 1.730x High 1.918x 1.790x 1.700x Implied XR Low Med High 8.0% 1.118x 1.431x 1.815x 10.0% 1.122x 1.434x 1.818x 12.0% 1.127x 1.438x 1.820x Discount Rate

Premiums Paid Analysis MLP Transactions ___________________________________ Source: Company filings, press releases, presentations and FactSet for pricing data. Represents precedent MLP transactions by affiliated and third party MLPs, Public GPs and C-Corps since 2011. Note: Considers transactions where target is an MLP. Unaffected 1-Day premium for transaction as of 2/23/2018, prior to Special Committee formation announcement. Spot pricing as of 10/8/2018. 33 At Transaction 26 Premium A B C D E F G H I J Announcement Transaction 1-Day Unaffected 1-Day Unaffected Taxable Acquiror Performance AMZ Performance Date Value Premium Premium Date Transaction Since Day Prior to Announcement Since Day Prior to Announcement 11/26/18 Dominion Energy Midstream Partners LP Dominion Energy Inc $3,598 0.9% 0.9% NA No (2.6%) (6.7%) 11/26/18 TransMontaigne Partners L.P. Arclight Capital 1,247 12.6% 12.6% NA No N/A (6.7%) 11/8/18 Western Gas Partners, LP Western Gas Equity Partners LP 12,781 7.6% 7.6% NA No (14.4%) (12.4%) 10/22/18 EnLink Midstream Partners, L.P. EnLink Midstream LLC 12,236 1.1% 1.1% NA Yes (39.6%) (16.7%) 10/18/18 Valero Energy Partners LP Valero Energy Corporation 3,788 6.0% 6.0% NA Yes (27.2%) (17.2%) 9/18/18 Enbridge Energy Partners Enbridge Inc. 15,562 2.1% 11.6% 5/17/18 Yes (7.9%) (18.9%) 8/24/18 Spectra Energy Partners, LP Enbridge Inc. 27,810 5.7% 19.4% 5/17/18 Yes (12.3%) (21.8%) 8/1/18 Energy Transfer Partners, LP Energy Transfer Equity, L.P. 66,981 11.2% 11.2% NA No (27.2%) (19.0%) 6/19/18 Cheniere Energy Partners LP Holdings Cheniere Energy Inc. 5,651 2.2% 10.7% 5/16/18 No (7.6%) (15.0%) 5/17/18 Williams Partners, LP Williams Companies 57,793 6.4% 16.5% 3/15/18 Yes (18.1%) (14.8%) 3/26/18 Tallgrass Energy Partners, LP Tall Grass Energy GP, LP 8,361 0.6% (18.4%) 2/7/18 Yes 37.1% (5.4%) 2/7/18 Terra Nitrogen Co. LP Terra Nitrogen GP, Inc. 1,474 3.7% 3.7% NA Yes N/A (19.9%) 1/2/18 Archrock Partners, LP Archrock, Inc 2,438 23.4% 23.4% NA Yes (23.9%) (17.9%) 8/29/17 Arc Logistics Partners LP Zenith Energy US, LP 736 15.2% 15.2% NA Yes N/A (17.3%) 10/25/16 PennTex Midstream Partners, LP Energy Transfer Partners, LP 789 43.3% 43.3% NA Yes N/A (28.1%) 3/2/17 VTTI Energy Partners, LP VTTI, B.V 1,867 6.0% 6.0% NA Yes N/A (31.8%) 4/3/17 World Point Terminals, LP World Point Terminals, Inc. 594 5.8% 5.8% NA Yes N/A (30.1%) 2/1/17 ONEOK Partners, LP ONEOK, Inc 23,654 25.8% 25.8% NA Yes (1.3%) (31.5%) 1/27/17 Midcoast Energy Partners, LP Enbridge Energy Company 1,176 (8.6%) (8.6%) NA Yes (28.8%) (33.5%) 11/21/16 Energy Transfer Partners, LP Sunoco Logistics Partners, LP 54,455 (0.2%) (0.2%) NA No N/A (25.3%) 10/24/16 JP Energy Partners LP American Midstream Partners 476 9.1% 9.1% NA No (77.9%) (28.0%) 9/26/16 Transcanada Columbia Pipeline Partners LP 3,464 11.1% 9.9% 3/16/16 Yes (22.4%) (27.8%) 8/1/16 Transocean Partners LLC Transocean Inc. 1,202 20.8% 20.8% NA No (35.0%) (28.8%) 5/30/16 Rose Rock Midstream SemGroup Corp. 2,034 0.0% 0.0% NA Yes (51.7%) (25.1%) 11/3/15 Targa Resources Partners LP Targa Resources Corp. 12,229 18.4% 18.4% NA Yes (36.9%) (32.3%) 10/26/15 Northern Tier Energy Western Refining, Inc. 5,286 11.7% 11.7% NA Yes N/A (30.3%) 7/13/15 MarkWest Energy Partners, LP MPLX LP 22,360 36.3% 36.3% NA No (55.5%) (43.6%) 5/6/15 Crestwood Midstream Partners Crestwood Equity Partners, LP 6,920 17.2% 17.2% NA No (57.4%) (50.0%) 4/6/15 QEP Midstream Partners LP Tesoro Logistics LP 1,145 8.6% (14.0%) 10/18/14 No (37.0%) (47.5%) 1/26/15 Regency Energy Partners LP Energy Transfer Partners, LP 18,593 13.2% 13.2% NA No N/A (50.0%) 10/26/14 Access Midstream Partners LP Williams Partners LP 34,256 (0.2%) (5.7%) 6/13/14 No N/A (55.9%) 10/13/14 Atlas Pipeline Partners LP Targa Resources Partners LP 6,002 15.0% 15.0% NA No N/A (53.7%) 11/12/14 Oiltanking Partners LP Enterprise Products Partners LP 4,289 1.7% (0.9%) 9/30/14 No (33.8%) (54.8%) 8/10/14 Kinder Morgan Energy Partners Kinder Morgan Inc. 52,566 12.0% 12.0% NA Yes (56.3%) (54.7%) 8/10/14 El Paso Pipeline Partners Kinder Morgan Inc. 13,677 15.4% 15.4% NA Yes (56.3%) (54.7%) 7/24/14 QR Energy LP Breitburn Energy Partners 2,856 17.5% 17.5% NA No N/A (57.1%) 10/10/13 PVR Partners LP Regency Energy Partners LP 5,659 25.7% 25.7% NA No N/A (48.6%) 8/27/13 PAA Natural Gas Storage LP Plains All American LP 2,531 8.5% 8.5% NA No (60.1%) (48.8%) 5/6/13 Crestwood Midstream Partners LP Inergy Midstream LP 2,643 14.5% 14.5% NA No N/A (50.0%) 1/29/13 Copano Energy LLC Kinder Morgan Energy Partners LP 4,858 23.5% 23.5% NA No N/A (47.2%) 2/23/11 Duncan Energy Partners LP Enterprise Products Partners 3,282 28.1% 28.1% NA No 14.4% (40.0%) Median 11.1% 11.7% Mean 11.7% 11.5% Taxable Transactions Median 6.2% 13.6% Taxable Transactions Mean 11.0% 11.9% Premium to Current (0.6%) 38.9% At Announcement (10/8/2018) (1) 6.4% 32.9% Acquiror Target

Transaction Assumptions ___________________________________ Source: FactSet as of 1/2/2019. Includes equity issued for Series B unit conversion into AMGP shares. Provided by Management. Status Quo Pro Forma Transaction effective on 12/31/2018 To acquire AM, AMGP will convert into a C-Corp in a 100% stock transaction Base case assumes: Each outstanding Public AM common unit exchanged for 1.6350 AMGP shares and $3.415 cash per AM unit, for an all-equity equivalent exchange ratio of 1.9175x Each outstanding AM common unit held at AR will be exchanged for 1.6023 AMGP shares and $3.00 cash per AM unit, for an all-equity equivalent exchange ratio of 1.8505x All existing Series B units exchanged for 17.354mm AMGP shares Assumes Company provided dividend policy Step-up depreciation due to Capex allocated on a 5-20 year MACRs schedule depending on capex category Goodwill based on inside tax basis and 704(c) and 743(b) provided by company management $600mm refinancing of revolver debt with 6% term loan issued on 12/31/2018 New capex financed by $500mm senior unsecured issuance in 2019, 2020, and 2022 at a 5.500% interest rate Transaction Assumptions Sources & Uses At Proposed Transaction AMGP Ownership Comparison (1) (2) 3.4% Series B share under Transaction 35 28 Sources AMGP Equity Issued $3,664 AM Debt Rolled to AMGP Balance Sheet 1,633 Revolver Draw 622 Total Sources $5,919 Existing Public 15.0% Mgmt. 11.2% Sponsors 13.9% AR 31.2% Prior AM Public 28.8% Existing Public 40.9% Mgmt. 21.1% Sponsors 38.0% Uses Purchase Non-Affiliated AM Units O/S $1,662 Purchase Affiliated AM Units O/S $1,804 Conversion of Series B Units 198 Cash Consideration - Affiliated Units 297 Cash Consideration - Non-Affiliated Units 301 Transaction Fees 24 AM Existing Debt 1,633 Total Uses $5,919

Accretion / (Dilution) Pre – Unitholder Tax(1) AM & AMGP AR Base Case AM Distributable Cash Flow Accretion / (Dilution) - % At 1.9175x Exchange Ratio AMGP Distributable Cash Flow Accretion / (Dilution) - % At 1.0x AM Coverage ___________________________________ Source: Management projections and FactSet as of 1/2/2019. Pre – Unitholder Tax; 1.9175x represents implied XR at 1.6350x equity XR and cash consideration of $3.415 / unit. Status Quo AMGP: Pro Forma AMGP: $ Acc / (Dil): 36 Status Quo AM: PF AMGP at 1.9175x: AM Distribution Accretion / (Dilution) - % At 1.9175x Exchange Ratio AMGP Distribution Accretion / (Dilution) - % $ Acc / (Dil): Status Quo AM: Pro Forma AMGP at 1.9175x: $ Acc / (Dil): (1) PF AMGP Coverage: Status Quo AMGP: Pro Forma AMGP: $ Acc / (Dil): PF AMGP Coverage: SQ AM Coverage: (1) (1) 29 9.7% 13.3% 19.8% 20.2% 2H 2018E $1.02 $0.97 $0.98 ($0.05) ($0.04) 2019E $2.42 $2.62 $2.66 $0.20 $0.23 2020E $2.90 $3.24 $3.29 $0.34 $0.39 2021E $3.74 $4.41 $4.48 $0.67 $0.74 1.9175x XR 9.8% 13.9% 18.6% 16.8% 2019E $2.44 $2.68 $0.24 2020E $2.97 $3.38 $0.41 2021E $3.54 $4.20 $0.66 2022E $3.89 $4.55 $0.66 7.6% 7.6% 7.4% 17.0% 2019E $2.21 $2.38 $0.17 1.130x 1.125x 2020E $2.85 $3.07 $0.22 1.050x 1.102x 2021E $3.42 $3.67 $0.25 1.041x 1.144x 2022E $3.76 $4.40 $0.64 1.040x 1.033x 39.8% 19.6% 10.1% 15.9% 2019E $0.89 $1.24 $0.35 1.125x 2020E $1.34 $1.60 $0.26 1.102x 2021E $1.74 $1.92 $0.18 1.144x 2022E $1.98 $2.30 $0.32 1.033x 33.8% 24.8% 20.7% 15.2% 2019E $1.04 $1.40 $0.35 2020E $1.41 $1.76 $0.35 2021E $1.81 $2.19 $0.38 2022E $2.06 $2.37 $0.31

Status Quo AMGP: Pro Forma AMGP: $ Acc / (Dil): PF AMGP Coverage: AM Distributable Cash Flow Accretion / (Dilution) - % At 1.9175x Exchange Ratio Accretion / (Dilution) Pre – Unitholder Tax(1) AM & AMGP AR Downside Volumes Case AMGP Distributable Cash Flow Accretion / (Dilution) - % At 1.0x AM Coverage ___________________________________ Source: Management projections and FactSet as of 1/2/2019. Pre – Unitholder Tax; 1.9175x represents implied XR at 1.6350x equity XR and cash consideration of $3.415 / unit. Status Quo AMGP: Pro Forma AMGP: $ Acc / (Dil): 37 AM Distribution Accretion / (Dilution) - % At 1.9175x Exchange Ratio AMGP Distribution Accretion / (Dilution) - % PF AMGP Coverage: Status Quo AM: PF AMGP at 1.9175x: $ Acc / (Dil): (1) Status Quo AM: Pro Forma AMGP at 1.9175x: $ Acc / (Dil): (1) PF AMGP Coverage: SQ AM Coverage: (1) 30 7.6% 19.1% 23.6% 28.7% 2019E $2.21 $2.38 $0.17 1.130x 1.125x 2020E $2.58 $3.07 $0.49 1.091x 1.006x 2021E $2.97 $3.67 $0.70 1.180x 1.089x 2022E $3.42 $4.40 $0.98 1.090x 0.975x 39.8% 39.9% 34.6% 31.9% 2019E $0.89 $1.24 $0.35 1.125x 2020E $1.14 $1.60 $0.46 1.006x 2021E $1.42 $1.92 $0.49 1.089x 2022E $1.74 $2.30 $0.56 0.975x 33.8% 26.8% 21.1% 17.9% 2019E $1.04 $1.40 $0.35 2020E $1.27 $1.61 $0.34 2021E $1.72 $2.09 $0.36 2022E $1.90 $2.24 $0.34 9.8% 11.6% 17.0% 16.5% 2019E $2.44 $2.68 $0.24 2020E $2.77 $3.09 $0.32 2021E $3.42 $4.00 $0.58 2022E $3.68 $4.29 $0.61 9.7% 13.3% 19.8% 20.2% 2H 2018E $1.02 $0.97 $0.98 ($0.05) ($0.04) 2019E $2.42 $2.62 $2.66 $0.20 $0.23 2020E $2.90 $3.24 $3.29 $0.34 $0.39 2021E $3.74 $4.41 $4.48 $0.67 $0.74 1.9175x XR

Status Quo AMGP: Pro Forma AMGP: $ Acc / (Dil): PF AMGP Coverage: AM Distributable Cash Flow Accretion / (Dilution) - % At 1.9175x Exchange Ratio Accretion / (Dilution) Pre – Unitholder Tax(1) AM & AMGP AR Upside Volumes Case AMGP Distributable Cash Flow Accretion / (Dilution) - % At 1.0x AM Coverage ___________________________________ Source: Management projections and FactSet as of 1/2/2019. Pre – Unitholder Tax; 1.9175x represents implied XR at 1.6350x equity XR and cash consideration of $3.415 / unit. Status Quo AMGP: Pro Forma AMGP: $ Acc / (Dil): 38 AM Distribution Accretion / (Dilution) - % At 1.9175x Exchange Ratio AMGP Distribution Accretion / (Dilution) - % PF AMGP Coverage: Status Quo AM: PF AMGP at 1.9175x: $ Acc / (Dil): (1) Status Quo AM: Pro Forma AMGP at 1.9175x: $ Acc / (Dil): (1) PF AMGP Coverage: SQ AM Coverage: (1) 9.7% 13.3% 19.8% 20.2% 2019E $2.42 $2.66 $0.23 2020E $2.90 $3.29 $0.39 2021E $3.74 $4.48 $0.74 2022E $4.16 $5.00 $0.84 7.6% 7.6% 7.4% 7.3% 2019E $2.21 $2.38 $0.17 1.123x 1.118x 2020E $2.85 $3.07 $0.22 1.022x 1.072x 2021E $3.42 $3.67 $0.25 1.108x 1.219x 2022E $4.10 $4.40 $0.30 1.016x 1.136x 39.8% 19.6% 10.1% 3.4% 2019E $0.89 $1.24 $0.35 1.118x 2020E $1.34 $1.60 $0.26 1.072x 2021E $1.74 $1.92 $0.18 1.219x 2022E $2.22 $2.30 $0.08 1.136x 34.0% 25.3% 19.6% 16.2% 2019E $1.03 $1.39 $0.35 2020E $1.37 $1.72 $0.35 2021E $1.95 $2.33 $0.38 2022E $2.24 $2.61 $0.36 9.7% 13.3% 19.8% 20.2% 2H 2018E $1.02 $0.97 $0.98 ($0.05) ($0.04) 2019E $2.42 $2.62 $2.66 $0.20 $0.23 2020E $2.90 $3.24 $3.29 $0.34 $0.39 2021E $3.74 $4.41 $4.48 $0.67 $0.74 1.9175x XR

Growth Comparison at Transaction Pre – Unitholder Tax SQ AM, SQ AMGP, & PF AMGP ___________________________________ Source: Management projections and FactSet as of 1/2/2019. Note: Coverage assumptions as provided by Management. PF AMGP coverage extrapolated based on fixed distributions provided for AR Base Case. SQ AM coverage for AR Base Case extrapolated based on fixed distributions provided for AR Base Case. SQ AM coverage for AR Downside Volumes base extrapolated based on fixed distributions provided for AR Downside Volumes Case. 39 31 DCF per Unit / Share 2019E - 2022E CAGR Updated Base Case 2019E 2020E 2021E 2022E AM $2.44 $2.97 $3.54 $3.89 17% AMGP @ 1.0x AM Coverage $1.04 $1.41 $1.81 $2.06 25% PF AMGP $1.40 $1.76 $2.19 $2.37 19% Updated Downside Case AM $2.44 $2.77 $3.42 $3.68 15% AMGP @ 1.0x AM Coverage $1.04 $1.27 $1.72 $1.90 22% PF AMGP $1.40 $1.61 $2.09 $2.24 17% Updated Upside Case AM $2.42 $2.90 $3.74 $4.16 20% AMGP @ 1.0x AM Coverage $1.03 $1.37 $1.95 $2.24 29% PF AMGP $1.39 $1.72 $2.33 $2.61 23% Distributions / Dividends per Unit / Share 2019E - 2022E CAGR Updated Base Case 2019E 2020E 2021E 2022E AM $2.21 $2.85 $3.42 $3.76 19% AMGP $0.89 $1.34 $1.74 $1.98 31% PF AMGP $1.24 $1.60 $1.92 $2.30 23% Updated Downside Case AM $2.21 $2.58 $2.97 $3.42 16% AMGP $0.89 $1.14 $1.42 $1.74 25% PF AMGP $1.24 $1.60 $1.92 $2.30 23% Updated Upside Case AM $2.21 $2.85 $3.42 $4.10 23% AMGP $0.89 $1.34 $1.74 $2.22 36% PF AMGP $1.24 $1.60 $1.92 $2.30 23% SQ AM Mgmt Dist Coverage (Updated Base Case) 1.130x 1.050x 1.041x 1.040x SQ AM Mgmt Dist Coverage (Updated Downside Case) 1.130x 1.091x 1.180x 1.090x SQ AM Mgmt Dist Coverage (Updated Upside Case) 1.123x 1.022x 1.108x 1.016x PF AMGP Mgmt. Dividend Coverage (Updated Base Case) 1.125x 1.102x 1.144x 1.033x PF AMGP Mgmt. Dividend Coverage (Updated Downside Case) 1.125x 1.006x 1.089x 0.975x PF AMGP Mgmt. Dividend Coverage (Updated Upside Case) 1.118x 1.072x 1.219x 1.136x

PF AMGP Selected Public Trading Comparables Midstream C-Corps & High – Growth MLPs ___________________________________ Source: FactSet as of 1/2/2019 and Wall Street research. Note: Assumes AMGP share price of $11.19 for offer / AM Proposal metrics. Note: On November 30th, 2019, Equitrans Midstream announced a simplification of EQGP and EQM. For C-corps, CAGR calculated using Q4 2017 dividend annualized and 2020E dividend. Calculated as equity value to LP DCF. DCF calculated as EBITDA less interest expense and maintenance capital. Defined as high-growth MLP if current – 2020E distribution growth CAGR is greater than 10%. 41 32 A B C D E F G H I J K L Distribution / Unit / Dist. Growth Equity Value / Enterprise Value / Coverage Unit Price at Price (Yield) 2018E to DCF (2,3) EBITDA Company 1/2/2019 Equity Value TEV Current 2019E 2020E CAGR (1) 2019E 2020E 2019E 2020E 2019E Non-IDR Midstream C-Corps Kinder Morgan Inc $15.80 $35,038 $70,320 5.1% 6.3% 25% 7.6x 7.4x 9.2x 8.8x 2.6x ONEOK, Inc. 54.41 22,382 31,251 6.3% 6.7% 10% 11.7x 10.9x 11.9x 9.9x 1.4x Plains All American Pipeline LP 20.57 16,290 25,830 5.8% 6.4% 11% 7.0x 7.1x 9.2x 9.1x 1.9x SemGroup Corporation 14.26 1,121 4,030 13.3% 14.1% 5% 4.8x 4.8x 9.3x 8.7x 1.4x Targa Resources Corp. 36.74 8,536 15,728 9.9% 9.9% 1% 9.5x 6.3x 10.0x 7.9x 1.1x The Williams Companies, Inc. 22.42 27,140 49,924 6.1% 6.8% 11% 8.5x 7.9x 9.8x 9.3x 2.2x Tallgrass Energy, LP 24.17 6,778 9,806 8.4% 9.0% 7% 10.3x 10.9x 10.3x 10.9x 1.2x High - Growth MLPs (4) BP Midstream Partners LP $16.02 $1,743 $2,023 7.3% 8.1% 15% 9.7x 8.5x 9.4x 7.4x 1.4x CNX Midstream Partners LP 16.40 1,214 1,726 8.5% 9.6% 15% 7.1x 5.9x 7.3x 6.2x 1.3x Hess Midstream Partners LP 17.62 987 3,287 8.1% 9.2% 15% 9.9x 9.0x 9.5x 8.0x 1.2x Noble Midstream Partners LP 29.67 1,254 2,513 7.5% 8.8% 20% 7.0x 5.0x 8.4x 7.1x 2.0x Oasis Midstream Partners LP 17.25 515 1,082 10.0% 11.7% 20% 5.3x 4.8x 7.5x 6.3x 1.1x Phillips 66 Partners LP 42.72 8,861 12,429 7.0% 8.1% 10% 10.6x 9.9x 10.1x 8.7x 1.3x Shell Midstream Partners LP 17.12 5,421 7,336 8.9% 10.0% 11% 8.4x 8.3x 8.8x 7.4x 1.2x Mean $9,806 $16,949 8.0% 8.9% 13% 8.4x 7.6x 9.3x 8.3x 1.5x Median $6,116 $7,429 7.8% 8.6% 11% 9.0x 8.1x 9.5x 8.7x 1.3x Midstream C-Corp Mean $16,755 $29,556 7.8% 8.5% 10% 8.5x 7.9x 10.0x 9.2x 1.7x Midstream C-Corp Median $16,290 $25,830 6.3% 6.8% 10% 8.5x 7.4x 9.8x 9.1x 1.4x High-Growth MLP Mean $2,856 $4,342 8.2% 9.4% 15% 8.3x 7.3x 8.7x 7.3x 1.4x High-Growth MLP Median $1,254 $2,513 8.1% 9.2% 15% 8.4x 8.3x 8.8x 7.4x 1.3x PF AMGP at Transaction $11.39 $4,033 $7,988 8.1% 10.1% 29% 8.9x 7.8x 9.0x 7.6x 1.1x

Has / Gets Analysis AR Base Case AM Pre – Unitholder Tax Valuation Effective Date: 12/31/2018 Stand Alone AM Implied Unit Price XR Adjusted PF AMGP Implied Share Price 1.9175x XR(1) ___________________________________ Source: Management projections and FactSet as of 1/2/2019. Implied XR at 1.6350x equity XR and cash consideration of $3.415 / unit. Cash consideration added to implied share price at 1.6350x XR. Unlevered free cash flow defined as PF AMGP EBITDA less cash taxes and capital expenditures. Implied equity value per share backs out implied AM Q4 2018 net debt per share. Discounted Levered DCF Analysis Discounted Distribution Analysis Discounted Levered DCF Analysis Discounted Distribution Analysis Discounted Cash Flow Unlevered FCF(2) Discounted at WACC 42 SQ vs PF Distribution Coverage 33 2022E DCF Multiple 2022E DCF Multiple $20.62 7.0x 8.5x 10.0x 8.0% $29.54 $34.17 $38.81 10.0% $28.16 $32.54 $36.93 12.0% $26.87 $31.02 $35.18 Discount Rate 2022E Distribution Yield 2022E Distribution Yield 10.0% 9.0% 8.0% 8.0% $37.34 $40.65 $44.80 10.0% $35.52 $38.66 $42.59 12.0% $33.84 $36.81 $40.53 Discount Rate 2022E DCF Multiple 2022E CAFD Multiple 7.0x 9.0x 11.0x 8.0% $32.68 $38.84 $44.99 10.0% $31.31 $37.13 $42.96 12.0% $30.02 $35.54 $41.06 Discount Rate 2022E Distribution Yield 2022E Distribution Yield 10.0% 8.5% 7.0% 8.0% $40.07 $45.33 $52.83 10.0% $38.28 $43.25 $50.36 12.0% $36.61 $41.32 $48.05 Discount Rate 2022E Terminal Multiple 9.0x 10.0x 11.0x 7.0% $36.24 $40.09 $43.93 8.5% $34.72 $38.41 $42.10 10.0% $33.28 $36.82 $40.36 Discount Rate 2019E 2020E 2021E 2022E SQ AM Coverage 1.130x 1.050x 1.041x 1.040x PF AMGP Coverage 1.125x 1.102x 1.144x 1.033x

Has / Gets Analysis AR Downside Volumes Case AM Pre – Unitholder Tax Valuation Effective Date: 12/31/2018 Stand Alone AM Implied Unit Price XR Adjusted PF AMGP Implied Share Price 1.9175x XR(1) Discounted Levered DCF Analysis Discounted Distribution Analysis Discounted Levered DCF Analysis Discounted Distribution Analysis Discounted Cash Flow Unlevered FCF(2) Discounted at WACC 43 SQ vs PF Distribution Coverage ___________________________________ Source: Management projections and FactSet as of 1/2/2019. Implied XR at 1.6350x equity XR and cash consideration of $3.415 / unit. Cash consideration added to implied share price at 1.6350x XR. Unlevered free cash flow defined as PF AMGP EBITDA less cash taxes and capital expenditures. Implied equity value per share backs out implied AM Q4 2018 net debt per share. 34 2022E DCF Multiple 2022E DCF Multiple $19.51 7.0x 8.5x 10.0x 8.0% $28.11 $32.49 $36.88 10.0% $26.79 $30.95 $35.10 12.0% $25.57 $29.51 $33.44 Discount Rate 2022E Distribution Yield 2022E Distribution Yield 10.0% 9.0% 8.0% 8.0% $34.02 $37.04 $40.81 10.0% $32.38 $35.23 $38.80 12.0% $30.84 $33.55 $36.93 Discount Rate 2022E DCF Multiple 2022E CAFD Multiple 7.0x 9.0x 11.0x 8.0% $31.11 $36.92 $42.73 10.0% $29.81 $35.31 $40.81 12.0% $28.60 $33.81 $39.02 Discount Rate 2022E Distribution Yield 2022E Distribution Yield 10.0% 8.5% 7.0% 8.0% $40.07 $45.33 $52.83 10.0% $38.28 $43.25 $50.36 12.0% $36.61 $41.32 $48.05 Discount Rate 2022E Terminal Multiple 9.0x 10.0x 11.0x 7.0% $34.19 $37.82 $41.45 8.5% $32.76 $36.24 $39.72 10.0% $31.40 $34.74 $38.08 Discount Rate 2019E 2020E 2021E 2022E SQ AM Coverage 1.130x 1.091x 1.180x 1.090x PF AMGP Coverage 1.125x 1.006x 1.089x 0.975x

Has / Gets Analysis AR Upside Volumes Case AM Pre – Unitholder Tax Valuation Effective Date: 12/31/2018 Stand Alone AM Implied Unit Price XR Adjusted PF AMGP Implied Share Price 1.9175x XR(1) Discounted Levered DCF Analysis Discounted Distribution Analysis Discounted Levered DCF Analysis Discounted Distribution Analysis Discounted Cash Flow Unlevered FCF(2) Discounted at WACC 44 SQ vs PF Distribution Coverage ___________________________________ Source: Management projections and FactSet as of 1/2/2019. Implied XR at 1.6350x equity XR and cash consideration of $3.415 / unit. Cash consideration added to implied share price at 1.6350x XR. Unlevered free cash flow defined as PF AMGP EBITDA less cash taxes and capital expenditures. Implied equity value per share backs out implied AM Q4 2018 net debt per share. 2022E DCF Multiple 2022E DCF Multiple $22.29 7.0x 8.5x 10.0x 8.0% $31.12 $36.07 $41.02 10.0% $29.65 $34.34 $39.02 12.0% $28.28 $32.72 $37.16 Discount Rate 2022E Distribution Yield 2022E Distribution Yield 10.0% 9.0% 8.0% 8.0% $40.04 $43.65 $48.17 10.0% $38.08 $41.50 $45.78 12.0% $36.26 $39.50 $43.55 Discount Rate 2022E DCF Multiple 2022E CAFD Multiple 7.0x 9.0x 11.0x 8.0% $34.94 $41.71 $48.48 10.0% $33.44 $39.85 $46.26 12.0% $32.05 $38.12 $44.19 Discount Rate 2022E Distribution Yield 2022E Distribution Yield 10.0% 8.5% 7.0% 8.0% $40.07 $45.33 $52.83 10.0% $38.28 $43.25 $50.36 12.0% $36.61 $41.32 $48.05 Discount Rate 2022E Terminal Multiple 9.0x 10.0x 11.0x 7.0% $38.81 $42.98 $47.15 8.5% $37.18 $41.18 $45.18 10.0% $35.63 $39.47 $43.31 Discount Rate 2019E 2020E 2021E 2022E SQ AM Coverage 1.123x 1.022x 1.108x 1.016x PF AMGP Coverage 1.118x 1.072x 1.219x 1.136x

Illustrative Discounted Future Value Pre – Unitholder Tax SQ AM & PF AMGP ___________________________________ Source: Management projections and FactSet as of 1/2/2019. Note: Valuation based on annual distributions. Implied XR at 1.6350x equity XR and cash consideration of $3.415 / unit. SQ AM AR Upside Case Assumptions Management projections Valuation date as of 12/31/18 Future share price calculated at FY1 distributions divided by yield Discounted to 12/31/18 at 10% cost of equity Interim distributions discounted upon receipt to 12/31/18 PF AMGP 1.9175x XR Adjusted(1) AR Upside Case Yield SQ AM AR Downside Volumes Case PF AMGP 1.9175x XR Adjusted(1) AR Downside Volumes Case Yield Current AM Unit Price Yield Current AM Unit Price Yield 45 SQ AM AR Base Case PF AMGP 1.9175x XR Adjusted(1) AR Base Case 8.0% 9.0% 10.0% Yield Current AM Unit Price 7.0% 8.5% 10.0% Yield SQ AM AR Upside Volumes Case 8.0% 9.0% 10.0% 8.0% 9.0% 10.0% 7.0% 8.5% 10.0% 7.0% 8.5% 10.0% 35 $26.67 $30.09 $33.64 $29.40 $32.96 $36.64 $32.81 $36.53 $40.38 $21.98 2019E 2020E 2021E $29.55 $33.14 $37.07 $33.95 $37.93 $42.29 $40.24 $44.77 $49.75 2019E 2020E 2021E $29.29 $34.23 $36.92 $32.31 $37.53 $40.21 $36.09 $41.65 $44.33 $21.98 2019E 2020E 2021E $29.55 $33.14 $37.07 $33.95 $37.93 $42.29 $40.24 $44.77 $49.75 2019E 2020E 2021E $29.29 $34.23 $39.60 $32.31 $37.53 $43.19 $36.09 $41.65 $47.68 $21.98 2019E 2020E 2021E $29.55 $33.14 $37.07 $33.95 $37.93 $42.29 $40.24 $44.77 $49.75 2019E 2020E 2021E

SQ AM After Tax Distribution Discount Model 9% Yield-Based Terminal Value AR Base Volumes Case 47 ___________________________________ Source: Management projections and FactSet as of 1/2/2019. Note: Assumes Unit sold on 12/31/2022. 37 2019E 2020E 2021E 2022E BT LP Distribution Per Unit $3.76 AT LP Distribution Per Unit $2.21 $2.85 $3.41 $3.75 Discount Factor 0.954 0.867 0.788 0.717 PV of LP Dist. per Unit $2.11 $2.47 $2.69 $2.69 Disc. LP Dist. Total $9.95 Terminal Yield 9.0% Implied Terminal Future Value per Unit $41.78 Tax Calculation: Average Purchase Price $26.64 Existing RoC ($6.15) Beginning Tax Basis $20.49 2019E 2020E 2021E 2022E Beg. Avg. Tax Basis / Unit $20.49 $17.50 $13.99 $10.19 Less: Distributions / Unit (2.21) (2.85) (3.42) (3.76) Plus: Net Income Allocated (0.78) (0.66) (0.38) 0.05 Avg. EOY Basis / Unit $17.50 $13.99 $10.19 $6.48 Implied Terminal Value per Unit $41.78 Less: Basis at YE 2022E ($6.48) Less: PAL at YE 2022E ($3.96) Gain Subject to Tax $31.34 Capital Gain $12.40 Ordinary Gain $18.94 Total Gain $31.34 Total Tax on Gain per Unit Tax on Ordinary Gain - 33.4% $6.33 Tax on Capital Gain - 23.8% 2.95 State Tax on Ordinary Income - 5.2% 0.98 State Tax on Capital Gain - 5.2% 0.64 Total Tax on Gain $10.90 Total Effective Tax Rate 34.8% After-Tax Future Value per Unit $30.88 Terminal Disc. Factor 0.683 Implied Present Value per Unit at 8% Terminal Yield $33.58 Implied Present Value per Unit at 9% Terminal Yield $31.04 Implied Present Value per Unit at 10% Terminal Yield $29.02

SQ AM After Tax Distribution Discount Model 9% Yield-Based Terminal Value AR Downside Volumes Case 48 ___________________________________ Source: Management projections and FactSet as of 1/2/2019. Note: Assumes Unit sold on 12/31/2022. 38 2019E 2020E 2021E 2022E BT LP Distribution Per Unit $3.42 AT LP Distribution Per Unit $2.21 $2.57 $2.96 $3.41 Discount Factor 0.954 0.867 0.788 0.717 PV of LP Dist. per Unit $2.11 $2.23 $2.34 $2.44 Disc. LP Dist. Total $9.12 Terminal Yield 9.0% Implied Terminal Future Value per Unit $38.00 Tax Calculation: Average Purchase Price $26.64 Existing RoC ($6.15) Beginning Tax Basis $20.49 2019E 2020E 2021E 2022E Beg. Avg. Tax Basis / Unit $20.49 $17.50 $14.26 $10.91 Less: Distributions / Unit (2.21) (2.58) (2.97) (3.42) Plus: Net Income Allocated (0.78) (0.66) (0.38) 0.05 Avg. EOY Basis / Unit $17.50 $14.26 $10.91 $7.55 Implied Terminal Value per Unit $38.00 Less: Basis at YE 2022E ($7.55) Less: PAL at YE 2022E ($3.96) Gain Subject to Tax $26.50 Capital Gain $7.55 Ordinary Gain $18.94 Total Gain $26.50 Total Tax on Gain per Unit Tax on Ordinary Gain - 33.4% $6.33 Tax on Capital Gain - 23.8% 1.80 State Tax on Ordinary Income - 5.2% 0.98 State Tax on Capital Gain - 5.2% 0.39 Total Tax on Gain $9.50 Total Effective Tax Rate 35.9% After-Tax Future Value per Unit $28.50 Terminal Disc. Factor 0.683 Implied Present Value per Unit at 8% Terminal Yield $30.89 Implied Present Value per Unit at 9% Terminal Yield $28.58 Implied Present Value per Unit at 10% Terminal Yield $26.74

SQ AM After Tax Distribution Discount Model 9% Yield-Based Terminal Value AR Upside Volumes Case 49 ___________________________________ Source: Management projections and FactSet as of 1/2/2019. Note: Assumes Unit sold on 12/31/2022. 2019E 2020E 2021E 2022E BT LP Distribution Per Unit $4.10 AT LP Distribution Per Unit $2.21 $2.85 $3.41 $4.09 Discount Factor 0.954 0.867 0.788 0.717 PV of LP Dist. per Unit $2.11 $2.47 $2.69 $2.93 Disc. LP Dist. Total $10.20 Terminal Yield 9.0% Implied Terminal Future Value per Unit $45.56 Tax Calculation: Average Purchase Price $26.64 Existing RoC ($6.15) Beginning Tax Basis $20.49 2019E 2020E 2021E 2022E Beg. Avg. Tax Basis / Unit $20.49 $17.50 $13.99 $10.19 Less: Distributions / Unit (2.21) (2.85) (3.42) (4.10) Plus: Net Income Allocated (0.78) (0.66) (0.38) 0.05 Avg. EOY Basis / Unit $17.50 $13.99 $10.19 $6.14 Implied Terminal Value per Unit $45.56 Less: Basis at YE 2022E ($6.14) Less: PAL at YE 2022E ($3.96) Gain Subject to Tax $35.46 Capital Gain $16.51 Ordinary Gain $18.94 Total Gain $35.46 Total Tax on Gain per Unit Tax on Ordinary Gain - 33.4% $6.33 Tax on Capital Gain - 23.8% 3.93 State Tax on Ordinary Income - 5.2% 0.98 State Tax on Capital Gain - 5.2% 0.86 Total Tax on Gain $12.10 Total Effective Tax Rate 34.1% After-Tax Future Value per Unit $33.46 Terminal Disc. Factor 0.683 Implied Present Value per Unit at 8% Terminal Yield $35.81 Implied Present Value per Unit at 9% Terminal Yield $33.05 Implied Present Value per Unit at 10% Terminal Yield $30.84

50 PF AMGP After Tax Cash Flow 8.5% Terminal Yield Value Unadjusted Exchange Ratio AR Base Case At 1.8897x Exchange Ratio ___________________________________ Source: Management projections and FactSet as of 1/2/2019. Inclusive of Federal & State capital gains taxes. AM current price of $21.98 as of 1/2/2019 Cash consideration used to pay all taxes for an average public AM unitholder; any additional cash available assumed to purchase secondary shares 39 2019E 2020E 2021E 2022E Terminal Tax Basis at YE 2018 $20.49 Taxes Incurred in Merger (Assumed Paid in 2020) 0.00 Cash Received from Offer 0.00 Stepped Up Basis Upon Close $22.04 XR Adj. PF AMGP BT Dist. per Share $2.34 $3.02 $3.62 $4.34 % RoC 67.3% 62.5% 58.3% 59.4% % QD 32.7% 37.5% 41.7% 40.6% Return of Capital $1.58 $1.91 $2.13 $2.60 Qualified Dividends $0.77 $1.15 $1.53 $1.78 Project Tax Liability ($0.18) ($0.27) ($0.36) ($0.42) XR Adj. PF AMGP AT Dist. per Share $2.16 $2.75 $3.26 $3.92 Terminal Yield 8.50% Sale at 12/31/22 - Terminal FV per XR Adj. PF AMGP Share $51.02 Less: Basis on Conversion ($22.04) Plus: Dividends Treated as Return of Capital $8.22 Gain on Sale Tax Rate (1) $37.21 Tax on Gain 29.0% $10.79 Sale at 12/31/22 - Terminal FV per XR Adj. PF AMGP Share $51.02 Less: Taxes on Gain ($10.79) Net Proceeds $40.24 Total Net Cash Flow $1.98 $2.48 $2.90 $3.50 $40.24 Total Cash In Flow $2.16 $2.75 $3.26 $3.92 $51.02 Total Cash Out Flow - Tax on Dividends ($0.18) ($0.27) ($0.36) ($0.42) ($10.79) Total Cash Out Flow - Taxes in Merger $0.00 Discount Factor 0.954 0.867 0.788 0.717 0.683 Implied Present Value per Share $1.89 $2.15 $2.29 $2.51 $27.48 XR Adj. PF AMGP Implied Present Value per Share $36.32

51 PF AMGP After Tax Cash Flow 8.5% Terminal Yield Value Unadjusted Exchange Ratio Downside Case At 1.8897x Exchange Ratio ___________________________________ Source: Management projections and FactSet as of 1/2/2019. Inclusive of Federal & State capital gains taxes. AM current price of $21.98 as of 1/2/2019 Cash consideration used to pay all taxes for an average public AM unitholder; any additional cash available assumed to purchase secondary shares 40 2019E 2020E 2021E 2022E Terminal Tax Basis at YE 2018 $20.49 Taxes Incurred in Merger (Assumed Paid in 2020) 0.00 Cash Received from Offer 0.00 Stepped Up Basis Upon Close $22.04 XR Adj. PF AMGP BT Dist. per Share $2.34 $3.02 $3.62 $4.34 % RoC 67.5% 72.9% 61.3% 59.3% % QD 32.5% 27.1% 38.7% 40.7% Return of Capital $1.58 $2.23 $2.24 $2.60 Qualified Dividends $0.76 $0.83 $1.42 $1.79 Project Tax Liability ($0.18) ($0.19) ($0.33) ($0.42) XR Adj. PF AMGP AT Dist. per Share $2.16 $2.83 $3.29 $3.92 Terminal Yield 8.50% Sale at 12/31/22 - Terminal FV per XR Adj. PF AMGP Share $51.02 Less: Basis on Conversion ($22.04) Plus: Dividends Treated as Return of Capital $8.66 Gain on Sale Tax Rate (1) $37.64 Tax on Gain 29.0% $10.91 Sale at 12/31/22 - Terminal FV per XR Adj. PF AMGP Share $51.02 Less: Taxes on Gain ($10.91) Net Proceeds $40.11 Total Net Cash Flow $1.98 $2.63 $2.95 $3.50 $40.11 Total Cash In Flow $2.16 $2.83 $3.29 $3.92 $51.02 Total Cash Out Flow - Tax on Dividends ($0.18) ($0.19) ($0.33) ($0.42) ($10.91) Total Cash Out Flow - Taxes in Merger $0.00 Discount Factor 0.954 0.867 0.788 0.717 0.683 Implied Present Value per Share $1.89 $2.28 $2.33 $2.51 $27.40 XR Adj. PF AMGP Implied Present Value per Share $36.40

52 PF AMGP After Tax Cash Flow 8.5% Terminal Yield Value Unadjusted Exchange Ratio AR Upside Case At 1.8897x Exchange Ratio ___________________________________ Source: Management projections and FactSet as of 1/2/2019. Inclusive of Federal & State capital gains taxes. AM current price of $21.98 aas of 1/2/2019 Cash consideration used to pay all taxes for an average public AM unitholder; any additional cash available assumed to purchase secondary shares 2019E 2020E 2021E 2022E Terminal Tax Basis at YE 2018 $20.49 Taxes Incurred in Merger (Assumed Paid in 2020) 0.00 Cash Received from Offer 0.00 Stepped Up Basis Upon Close $22.04 XR Adj. PF AMGP BT Dist. per Share $2.34 $3.02 $3.62 $4.34 % RoC 67.7% 65.2% 50.1% 47.1% % QD 32.3% 34.8% 49.9% 52.9% Return of Capital $1.59 $1.99 $1.83 $2.07 Qualified Dividends $0.76 $1.07 $1.83 $2.32 Project Tax Liability ($0.18) ($0.25) ($0.43) ($0.55) XR Adj. PF AMGP AT Dist. per Share $2.16 $2.77 $3.19 $3.79 Terminal Yield 8.50% Sale at 12/31/22 - Terminal FV per XR Adj. PF AMGP Share $51.02 Less: Basis on Conversion ($22.04) Plus: Dividends Treated as Return of Capital $7.48 Gain on Sale Tax Rate (1) $36.47 Tax on Gain 29.0% $10.57 Sale at 12/31/22 - Terminal FV per XR Adj. PF AMGP Share $51.02 Less: Taxes on Gain ($10.57) Net Proceeds $40.45 Total Net Cash Flow $1.98 $2.52 $2.76 $3.25 $40.45 Total Cash In Flow $2.16 $2.77 $3.19 $3.79 $51.02 Total Cash Out Flow - Tax on Dividends ($0.18) ($0.25) ($0.43) ($0.55) ($10.57) Total Cash Out Flow - Taxes in Merger $0.00 Discount Factor 0.954 0.867 0.788 0.717 0.683 Implied Present Value per Share $1.89 $2.19 $2.18 $2.33 $27.63 XR Adj. PF AMGP Implied Present Value per Share $36.21

After-Tax Discounted Dividend / Distribution Analysis XR Adjusted Implied PV / Unit at Various 2022E Distribution Yield 10% Equity Discount Rate 53 AR Base Case AR Downside Volumes Case ___________________________________ Source: Management projections and FactSet as of 1/2/2019. Note: Cash consideration of $3.415 per AM unit. Tax calculations provided by Management. Ordinary gain tax rate for AM accounts for Federal ordinary income tax rate of 37%, individual MLP investor deduction rate of 20% and 3.8% ACA tax rate. Ordinary gain tax rate for PF AMGP accounts for Federal ordinary income tax rate of 37% and 3.8% ACA tax rate. Transaction based on Non-AR Unitholders receiving 1.6350x AMGP shares + $3.415 cash consideration, AR receives 1.6023x + $3.000 cash consideration, and Series B receive 17.354mm AMGP shares AM current price of $21.98 as of 1/2/2019 Cash consideration used to pay all taxes for an average public AM unitholder; any additional cash available assumed to purchase secondary shares For comparison purposes, AM Proposal assumes issuance of 17.354mm AMGP shares for Series B Unitholders (1) (1) AR Upside Case 41 (1) SQ AM 2022E Distribution Yield 10.0% 9.0% 8.0% $26.74 $28.58 $30.89 PF AMGP 2022E Dividend Yield All-In XR Tax-Adjusted Equity Only XR 10.0% 8.5% 7.0% XR AMGP Proposal 1.9175x 1.8897x $32.69 $36.40 $41.71 SQ AM 2022E Distribution Yield 10.0% 9.0% 8.0% $29.02 $31.04 $33.58 PF AMGP 2022E Dividend Yield All-In XR Tax-Adjusted Equity Only XR 10.0% 8.5% 7.0% XR AMGP Proposal 1.9175x 1.8897x $32.60 $36.32 $41.62 2019E 2020E 2021E 2022E SQ AM Coverage 1.130x 1.091x 1.180x 1.090x PF AMGP Coverage 1.125x 1.006x 1.089x 0.975x 2019E 2020E 2021E 2022E SQ AM Coverage 1.130x 1.050x 1.041x 1.040x PF AMGP Coverage 1.125x 1.102x 1.144x 1.033x SQ AM 2022E Distribution Yield 10.0% 9.0% 8.0% $30.84 $33.05 $35.81 PF AMGP 2022E Dividend Yield All-In XR Tax-Adjusted Equity Only XR 10.0% 8.5% 7.0% XR AMGP Proposal 1.9175x 1.8897x $32.69 $36.21 $41.51 2019E 2020E 2021E 2022E SQ AM Coverage 1.123x 1.022x 1.108x 1.016x PF AMGP Coverage 1.118x 1.072x 1.219x 1.136x

Certain TPH Relationships In May 2017, TPH served as co-manager on Antero Midstream GP’s $875 million initial public offering In October 2016, TPH served as financial advisor to Antero Resources on its $170 million sale of 17,000 net acres in southwest PA In June 2016, TPH served as a co-manager on Antero Resources’ $762 million follow-on equity offering In November 2014, TPH served as a co-manager on Antero Midstream’s $1 billion initial public offering In May 2014, TPH served as a senior co-manager on Antero Resources’ $744 million follow-on equity offering In October 2013, TPH acted as senior co-manager on Antero Resources’ $1.57 billion initial public offering TPH is a full service securities firm engaged in securities trading, brokerage and private equity and investment management activities as well as providing investment banking and other financial services. In the ordinary course of business, TPH and its affiliates, including Perella Weinberg Partners, may acquire, hold or sell, for their own accounts and the accounts of customers, equity, debt and other securities and financial instruments (including bank loans and other obligations) of AM, AMGP, AR, their affiliates, other prospective transaction participants and other companies that may be involved in the transactions, as well as provide investment banking and other financial services to such companies. TPH has in the past and may in the future provide financial advisory services to AM, AMGP, AR and other transaction participants. In addition, TPH, its affiliates and certain of their employees, including members of the team performing this engagement, as well as certain private equity and investment management funds associated or affiliated with TPH in which they may have financial interests, may from time-to-time acquire, hold or make direct or indirect investments in or otherwise finance a wide variety of companies, including the parties, other transaction participants and their respective affiliates. TPH merged with Perella Weinberg Partners (“PWP”) in November 2016 Relationship Disclosure TPH Investment Banking & Antero Midstream Partners, Antero Midstream Partners GP and Antero Resources 54 42

17% Management Projections: AM Updated Base Case Operations & EBITDA Low Pressure (Bcf/d) Water Handling (MBbls/d) Capital Expenditures DCF and Distributions per Unit Distribution Breakdown 2019E – 2022E CAGR ___________________________________ Source: Management Projections, Company Filings. Note: Operational volumes based on annual average volumes. YoY growth of LP DCF per unit and LP distributions per unit respectively. Coverage ratio calculated as total DCF over total distributions. Coverage Ratio(2) ($ in millions, unless otherwise noted) 19% Total LP DCF Total LP Distributions YoY Growth(1) 60 48 $398 $437 $209 $73 $136 $110 $43 $20 $125 $4 $34 $1 $198 $154 $96 $47 $769 $827 $348 $141 2019E 2020E 2021E 2022E 64% 60% 58% 57% 34% 38% 40% 40% 2% 2% 2% 2% 2019E 2020E 2021E 2022E $447 $445 $309 $274 $132 $113 $45 $22 $125 $34 $1 $198 $154 $96 $47 $815 $838 $450 $344 2019A 2020A 2021E 2022E MPLX JV Wastewater Stonewall Earn-out payment Water Handling Gathering & Compression 92% 78% 68% 63% 59% 57% 55% 8% 22% 30% 36% 39% 41% 42% - % 1% 1% 2% 2% 2% 2% 2016A 2017A 2018E 2019E 2020E 2021E 2022E AM LPs AMGP (IDRs) Series B Units $1.49 $1.61 $2.07 $2.76 $3.24 $3.75 $4.29 $1.03 $1.33 $1.72 $2.21 $2.85 $3.42 $4.10 2016A 2017A 2018E 2019E 2020E 2021E 2022E LP DCF per Unit LP Distributions per Unit $2.44 $2.97 $3.54 $3.89 $2.21 $2.85 $3.42 $3.76 2019E 19%/29% 1.13x $456 $413 2020E 22%/29% 1.05x $555 $533 2021E 19%/20% 1.04x $662 $640 2022E 10%/10% 1.04x $728 $703 161 216 221 215 140 209 273 309 2.7 3.0 3.6 4.0 $892 $1,143 $1,338 $1,465 2019E 2020E 2021E 2022E 1.4 1.7 2.2 2.8 3.5 4.1 4.7 3.5 4.4 5.1 5.9 6.3 6.9 7.4 0.8 1.1 1.2 1.5 2.1 2.7 3.1 4 4 5 6 6 7 7 $404 $529 $730 $989 $1,222 $1,413 $1,642 2016A 2017A 2018E 2019E 2020E 2021E 2022E Low Pressure Water Delivery Produced Water EBITDA

15% Management Projections: AM Updated Downside Case Operations & EBITDA Low Pressure (Bcf/d) Water Handling (MBbls/d) Capital Expenditures DCF and Distributions per Unit Distribution Breakdown 2019E – 2022E CAGR ___________________________________ Source: Management Projections, Company Filings. Note: Operational volumes based on annual average volumes. YoY growth of LP DCF per unit and LP distributions per unit respectively. Coverage ratio calculated as total DCF over total distributions. Coverage Ratio(2) ($ in millions, unless otherwise noted) 16% Total LP DCF Total LP Distributions YoY Growth(1) 61 49 $398 $319 $272 $147 $136 $131 $59 $19 $125 $4 $34 $1 $198 $119 $50 $95 $769 $695 $382 $262 2019E 2020E 2021E 2022E 64% 60% 58% 57% 34% 38% 40% 40% 2% 2% 2% 2% 2019E 2020E 2021E 2022E $447 $445 $309 $274 $132 $113 $45 $22 $125 $34 $1 $198 $154 $96 $47 $815 $838 $450 $344 2019A 2020A 2021E 2022E MPLX JV Wastewater Stonewall Earn-out payment Water Handling Gathering & Compression 92% 78% 68% 63% 59% 57% 55% 8% 22% 30% 36% 39% 41% 42% - % 1% 1% 2% 2% 2% 2% 2016A 2017A 2018E 2019E 2020E 2021E 2022E AM LPs AMGP (IDRs) Series B Units $1.49 $1.61 $2.07 $2.76 $3.24 $3.75 $4.29 $1.03 $1.33 $1.72 $2.21 $2.85 $3.42 $4.10 2016A 2017A 2018E 2019E 2020E 2021E 2022E LP DCF per Unit LP Distributions per Unit $2.44 $2.77 $3.42 $3.68 $2.21 $2.58 $2.97 $3.42 2019E 19%/29% 1.13x $456 $413 2020E 14%/17% 1.09x $517 $482 2021E 24%/15% 1.18x $640 $556 2022E 8%/15% 1.09x $689 $640 161 159 229 216 140 200 259 293 2.7 3.0 3.4 3.8 $892 $1,051 $1,296 $1,382 2019E 2020E 2021E 2022E 1.4 1.7 2.2 2.8 3.5 4.1 4.7 3.5 4.4 5.1 5.9 6.3 6.9 7.4 0.8 1.1 1.2 1.5 2.1 2.7 3.1 4 4 5 6 6 7 7 $404 $529 $730 $989 $1,222 $1,413 $1,642 2016A 2017A 2018E 2019E 2020E 2021E 2022E Low Pressure Water Delivery Produced Water EBITDA

20% Management Projections: AM Updated Upside Case Operations & EBITDA Low Pressure (Bcf/d) Water Handling (MBbls/d) Capital Expenditures DCF and Distributions per Unit Distribution Breakdown 2019E – 2022E CAGR ___________________________________ Source: Management Projections, Company Filings. Note: Operational volumes based on annual average volumes. YoY growth of LP DCF per unit and LP distributions per unit respectively. Coverage ratio calculated as total DCF over total distributions. Coverage Ratio(2) ($ in millions, unless otherwise noted) 23% Total LP DCF Total LP Distributions YoY Growth(1) 62 $447 $445 $309 $274 $132 $113 $45 $22 $125 $4 $34 $1 $198 $154 $96 $47 $815 $838 $450 $344 2019E 2020E 2021E 2022E 64% 60% 58% 57% 34% 38% 40% 41% 2% 2% 2% 2% 2019E 2020E 2021E 2022E $447 $445 $309 $274 $132 $113 $45 $22 $125 $34 $1 $198 $154 $96 $47 $815 $838 $450 $344 2019A 2020A 2021E 2022E MPLX JV Wastewater Stonewall Earn-out payment Water Handling Gathering & Compression 92% 78% 68% 63% 59% 57% 55% 8% 22% 30% 36% 39% 41% 42% - % 1% 1% 2% 2% 2% 2% 2016A 2017A 2018E 2019E 2020E 2021E 2022E AM LPs AMGP (IDRs) Series B Units $1.49 $1.61 $2.07 $2.76 $3.24 $3.75 $4.29 $1.03 $1.33 $1.72 $2.21 $2.85 $3.42 $4.10 2016A 2017A 2018E 2019E 2020E 2021E 2022E LP DCF per Unit LP Distributions per Unit $2.42 $2.90 $3.74 $4.16 $2.21 $2.85 $3.42 $4.10 2019E 18%/29% 1.12x $453 $413 2020E 20%/29% 1.02x $543 $533 2021E 29%/20% 1.11x $699 $640 2022E 11%/20% 1.02x $778 $767 161 205 262 254 140 207 283 331 2.7 3.0 3.7 4.3 $892 $1,128 $1,431 $1,588 2019E 2020E 2021E 2022E 1.4 1.7 2.2 2.8 3.5 4.1 4.7 3.5 4.4 5.1 5.9 6.3 6.9 7.4 0.8 1.1 1.2 1.5 2.1 2.7 3.1 4 4 5 6 6 7 7 $404 $529 $730 $989 $1,222 $1,413 $1,642 2016A 2017A 2018E 2019E 2020E 2021E 2022E Low Pressure Water Delivery Produced Water EBITDA

AMGP & Series B Unit Valuation(1,2,5) Management Projections: AMGP Updated Base Case IDR LLC owns the 100% of the IDRs in AM and has two share classes AMGP owns 100% of the Series A units Management owns 100% of the Series B units Series B unitholders are entitled to receive up to 6% of the distributions from AM in excess of $7.5MM per quarter Remaining profits pass through AMGP via Series A shares Series B units scheduled to vest at a value of 6% of equity value above $2 billion in the event of a liquidation of IDR LLC AMGP currently pays corporate taxes of 21% and 4% at the federal and state taxes, respectively IDR LLC, Series B Cash Flow, and Tax Observations AMGP Total Distributions IDR LLC Cash Flow ’19 – ’22 CAGR 26% 31% ($ in millions, unless otherwise noted) ___________________________________ Source: Management Projections, Company Filings. Implied AMGP and Series B valuation from 2016A through 2020E based on 2018E yield. Implied AMGP and Series B valuation from 2021E forward based on yield vs growth regression analysis. Excludes IPO related G&A. Series B valuation calculated as 6% of the valuation of AMGP less $2 billion. Illustrative yield based on regression analysis. 63 50 2019E 2020E 2021E 2022E AM Distributions to IDR LLC $235 $355 $462 $525 Series B Take (12) (20) (26) (30) Cash Distributions to AMGP $223 $336 $436 $496 G&A (3) (2) (2) (2) (2) Taxes (56) (85) (110) (125) CAFD to AMGP Shareholders $165 $249 $324 $369 Illustrative Yield 3.3% 3.3% 3.5% 5.9% AMGP Valuation $5,000 $7,545 $9,370 $6,246 Series B Valuation (4) $180 $333 $442 $255 $165 $249 $324 $369 $56 $85 $110 $125 $2 $2 $2 $2 $12 $20 $26 $30 $235 $355 $462 $525 2019E 2020E 2021E 2022E $10 $48 $100 $165 $249 $324 $413 $6 $16 $34 $56 $85 $110 $140 $1 $2 $2 $2 $2 $2 $2 $2 $7 $12 $20 $26 $34 2016A 2017A 2018E 2019E 2020E 2021E 2022E Distributions to AMGP Taxes G&A Series B Reserved CF $10 $48 $101 $166 $250 $326 $415 $52 $86 $144 $237 $302 $369 $441 2016A 2017A 2018E 2019E 2020E 2021E 2022E SQ AM Distribution Policy SQ AM Fully Distributed $165 $249 $324 $369 $195 $265 $340 $386 2019A 2020A 2021E 2022E

AMGP & Series B Unit Valuation(1,2,5) Management Projections: AMGP Updated Downside Case IDR LLC owns the 100% of the IDRs in AM and has two share classes AMGP owns 100% of the Series A units Management owns 100% of the Series B units Series B unitholders are entitled to receive up to 6% of the distributions from AM in excess of $7.5MM per quarter Remaining profits pass through AMGP via Series A shares Series B units scheduled to vest at a value of 6% of equity value above $2 billion in the event of a liquidation of IDR LLC AMGP currently pays corporate taxes of 21% and 4% at the federal and state taxes, respectively IDR LLC, Series B Cash Flow, and Tax Observations AMGP Total Distributions IDR LLC Cash Flow ’19 – ’22 CAGR 23% 25% ($ in millions, unless otherwise noted) ___________________________________ Source: Management Projections, Company Filings. Implied AMGP and Series B valuation from 2016A through 2020E based on 2018E yield. Implied AMGP and Series B valuation from 2021E forward based on yield vs growth regression analysis. Excludes IPO related G&A. Series B valuation calculated as 6% of the valuation of AMGP less $2 billion. Illustrative yield based on regression analysis. 64 51 2019E 2020E 2021E 2022E AM Distributions to IDR LLC $235 $304 $378 $462 Series B Take (12) (16) (21) (26) Cash Distributions to AMGP $223 $287 $357 $436 G&A (3) (2) (2) (2) (2) Taxes (56) (72) (90) (110) CAFD to AMGP Shareholders $165 $213 $265 $324 Illustrative Yield 3.3% 3.3% 5.1% 5.6% AMGP Valuation $5,000 $6,451 $5,193 $5,764 Series B Valuation (4) $180 $267 $192 $226 $165 $213 $265 $324 $56 $72 $90 $110 $2 $2 $2 $2 $12 $16 $21 $26 $235 $304 $378 $462 2019E 2020E 2021E 2022E $10 $48 $100 $165 $249 $324 $413 $6 $16 $34 $56 $85 $110 $140 $1 $2 $2 $2 $2 $2 $2 $2 $7 $12 $20 $26 $34 2016A 2017A 2018E 2019E 2020E 2021E 2022E Distributions to AMGP Taxes G&A Series B Reserved CF $10 $48 $101 $166 $250 $326 $415 $52 $86 $144 $237 $302 $369 $441 2016A 2017A 2018E 2019E 2020E 2021E 2022E SQ AM Distribution Policy SQ AM Fully Distributed $165 $213 $265 $324 $195 $238 $324 $359 2019A 2020A 2021E 2022E

AMGP & Series B Unit Valuation(1,2,5) Management Projections: AMGP Updated Upside Case IDR LLC owns the 100% of the IDRs in AM and has two share classes AMGP owns 100% of the Series A units Management owns 100% of the Series B units Series B unitholders are entitled to receive up to 6% of the distributions from AM in excess of $7.5MM per quarter Remaining profits pass through AMGP via Series A shares Series B units scheduled to vest at a value of 6% of equity value above $2 billion in the event of a liquidation of IDR LLC AMGP currently pays corporate taxes of 21% and 4% at the federal and state taxes, respectively IDR LLC, Series B Cash Flow, and Tax Observations AMGP Total Distributions IDR LLC Cash Flow ’19 – ’22 CAGR 30% 36% ($ in millions, unless otherwise noted) ___________________________________ Source: Management Projections, Company Filings. Implied AMGP and Series B valuation from 2016A through 2020E based on 2018E yield. Implied AMGP and Series B valuation from 2021E forward based on yield vs growth regression analysis. Excludes IPO related G&A. Series B valuation calculated as 6% of the valuation of AMGP less $2 billion. Illustrative yield based on regression analysis. 65 2019E 2020E 2021E 2022E AM Distributions to IDR LLC $235 $355 $462 $589 Series B Take (12) (20) (26) (34) Cash Distributions to AMGP $223 $336 $436 $555 G&A (3) (2) (2) (2) (2) Taxes (56) (85) (110) (140) CAFD to AMGP Shareholders $165 $249 $324 $413 Illustrative Yield 3.3% 3.3% 3.5% 4.8% AMGP Valuation $5,000 $7,545 $9,370 $8,617 Series B Valuation (4) $180 $333 $442 $397 $165 $249 $324 $413 $56 $85 $110 $140 $2 $2 $2 $2 $12 $20 $26 $34 $235 $355 $462 $589 2019E 2020E 2021E 2022E $10 $48 $100 $165 $249 $324 $413 $6 $16 $34 $56 $85 $110 $140 $1 $2 $2 $2 $2 $2 $2 $2 $7 $12 $20 $26 $34 2016A 2017A 2018E 2019E 2020E 2021E 2022E Distributions to AMGP Taxes G&A Series B Reserved CF $10 $48 $101 $166 $250 $326 $415 $52 $86 $144 $237 $302 $369 $441 2016A 2017A 2018E 2019E 2020E 2021E 2022E SQ AM Distribution Policy SQ AM Fully Distributed $165 $249 $324 $413 $193 $256 $366 $421 2019A 2020A 2021E 2022E

AMGP Status Quo Management Projections & Wall Street Consensus AMGP is covered by 12 analysts as compared to 22 for AR and 14 for AM Median price target of $21.00 as of 1/2/2019 Average price target range of $15.00 - $27.00 as of 1/2/2019 Commentary EBITDA Total Distributions to AMGP Shareholders Distributions per Share ___________________________________ Source: Management Projections, Thomson One, FactSet as of 1/2/2019. Note: WSC estimates available for AMGP through 2020E. 2017A distributions / share represents 4th quarter distribution annualized. ($ in millions, unless otherwise noted) 36% 2019E – 2022E CAGR 31% 36% 2019E – 2022E CAGR 31% 36% 2019E – 2022E CAGR 30% 67 25% 25% 25% 53 $336 $436 $555 $223 $336 $436 $496 $330 $280 $458 $223 $287 $357 $436 2019E 2020E 2021E 2022E $1.34 $1.74 $2.22 $1.34 $1.74 $1.98 $1.32 $1.55 $1.81 $0.89 $1.14 $1.42 $1.74 2019E 2020E 2021E 2022E $249 $324 $413 $249 $324 $369 $245 $289 $337 $165 $213 $265 $324 2019E 2020E 2021E 2022E $3.76 $3.89 $4.17 $3.42 1E Wall Street Consensus Mgmt. Projections at Updated Upside Case Mgmt. Projections at Updated Base Case Mgmt. Projections at Updated Downside Case

SQ AM Peer Group Cost of Equity Analysis Comparable Public Company Yield-Based Cost of Equity Expected Total Return Cost of Equity Sensitized Peer Total Return Cost of Equity Barra Beta ______________________________________________ Source: Bloomberg, Duff & Phelps, FactSet, Federal Reserve, Company filings as of 1/2/2019. Weights Expected Current – 2020E distribution growth estimates 15% and long-term economic growth estimate by 85% to arrive at a long-term distribution growth estimate. Barra beta as of 12/29/2018. Illustrative low and high range reflects a -/+ 15% range around Barra beta. 20-year treasury bond yield as of 1/2/19. Duff & Phelps historical arithmetic premium. Low High (2) (3) (4) 70 56 Cost of Equity 13.4% 14.4% A B C D E F Expected Current - 2020E Long-Term Economic Company Distribution CAGR Growth Estimate Expected Growth (1) Current Yield Implied Total Return CNX Midstream Partners LP 15.0% 4.0% 5.6% 8.5% 14.1% Phillips 66 Partners LP 10.0% 4.0% 4.9% 7.0% 11.9% Oasis Midstream Partners LP 20.0% 4.0% 6.4% 10.0% 16.4% Hess Midstream Partners LP 14.9% 4.0% 5.6% 8.1% 13.7% Noble Midstream Partners LP 19.7% 4.0% 6.4% 7.5% 13.9% BP Midstream Partners LP 14.7% 4.0% 5.6% 7.3% 12.9% Shell Midstream Partners LP 11.5% 4.0% 5.1% 8.9% 14.0% Western Gas Partners, L.P. 6.1% 4.0% 4.3% 9.0% 13.3% EQT Midstream Partners LP 8.7% 4.0% 4.7% 10.2% 14.9% Median 14.7% 4.0% 5.6% 8.5% 13.9% Mean 13.4% 4.0% 5.4% 8.5% 13.9% Raw Beta 0.61 0.82 Spot Risk-Free Rate 2.8% 2.8% Equity Risk Premium 6.0% 6.0% Cost of Equity 6.5% 7.8%

SQ AMGP Peer Group Cost of Equity Analysis Comparable Public Company Yield-Based Cost of Equity Expected Total Return Cost of Equity Sensitized Peer Total Return Cost of Equity Barra Beta ______________________________________________ Source: Bloomberg, Duff & Phelps, FactSet, Federal Reserve, Company filings as of 1/2/2019. Weights Expected Current – 2020E distribution growth estimates 15% and long-term economic growth estimate by 85% to arrive at a long-term distribution growth estimate. Barra beta as of 12/29/2018. Illustrative low and high range reflects a -/+ 15% range around Barra beta. 20-year treasury bond yield as of 1/2/19. Duff & Phelps historical arithmetic premium. Low High (2) (3) (4) 71 57 Cost of Equity 12.6% 13.6% A B C D E F Expected Current - 2020E Long-Term Economic Company Distribution CAGR Growth Estimate Expected Growth (1) Current Yield Implied Total Return EQT GP Holdings LP 8.0% 4.0% 4.6% 6.3% 10.9% Equitrans Midstream LLC 10.1% 4.0% 4.9% 8.2% 13.1% Western Gas Equity Partners, LP 9.9% 4.0% 4.9% 8.4% 13.3% Median 9.9% 4.0% 4.9% 8.2% 13.1% Mean 9.3% 4.0% 4.8% 7.6% 12.4% Raw Beta 0.69 0.93 Spot Risk-Free Rate 2.8% 2.8% Equity Risk Premium 6.0% 6.0% Cost of Equity 7.0% 8.4%

PF AMGP Peer Group WACC Analysis ______________________________________________ Source: Bloomberg, Duff & Phelps, FactSet, Federal Reserve, Company filings as of 1/2/2019. Weights Expected Current – 2020E distribution growth estimates 15% and long-term economic growth estimate by 85% to arrive at a long-term distribution growth estimate. Expected Total Return 72 58 A B C D E F 2018E - 2020E Long-Term Economic Company Dividend CAGR Growth Estimate Expected Growth (1) Current Yield Implied Total Return Kinder Morgan Inc 25.0% 4.0% 7.1% 3.2% 10.3% ONEOK, Inc. 10.5% 4.0% 5.0% 5.5% 10.5% Plains All American Pipeline LP 10.9% 4.0% 5.0% 5.8% 10.9% SemGroup Corporation 5.1% 4.0% 4.2% 12.6% 16.8% Tallgrass Energy, LP 6.5% 4.0% 4.4% 5.0% 9.3% Targa Resources Corp. 0.8% 4.0% 3.5% 9.9% 13.4% The Williams Companies, Inc. 11.3% 4.0% 5.1% 5.4% 10.4% BP Midstream Partners LP 14.7% 4.0% 5.6% 7.3% 12.9% CNX Midstream Partners LP 15.0% 4.0% 5.6% 8.5% 14.1% Hess Midstream Partners LP 14.9% 4.0% 5.6% 8.1% 13.7% Noble Midstream Partners LP 19.7% 4.0% 6.4% 7.5% 13.9% Oasis Midstream Partners LP 20.0% 4.0% 6.4% 10.0% 16.4% Phillips 66 Partners LP 10.0% 4.0% 4.9% 7.0% 11.9% Shell Midstream Partners LP 11.5% 4.0% 5.1% 8.9% 14.0% Median 11.4% 4.0% 5.1% 7.4% 13.2% Mean 12.6% 4.0% 5.3% 7.5% 12.8%

PF AMGP Peer Group WACC Analysis (cont.) Cost of Equity Comparable Company Yield-Based Cost of Equity Barra Beta 73 ______________________________________________ Source: Bloomberg, Duff & Phelps, FactSet, Federal Reserve, Company filings as of 1/2/2019. Illustrative low and high range reflects a -/+ 100 bps range around after tax current 5.6% cost of debt at AM. Barra beta for AMGP as of 12/29/2018. Illustrative low and high range reflects a -/+ 15% range around Barra beta. 20-year treasury bond yield as of 1/2/19. Duff & Phelps historical arithmetic premium. Optimal Capital Structure based on Total Debt of 3.5x 2019E EBITDA Low High Low High (2) (3) (4) Low High Low High (1) Cost of Capital Yield Based PF Capital Structure Cost of Capital Yield Based Optimal Capital Structure(5) (1) Low High Low High Cost of Capital Barra Beta PF Capital Structure Cost of Capital Barra Beta Optimal Capital Structure(5) (1) (1) 59 Cost of Equity 12.7% 13.7% Market Value of Equity $5,788 $5,788 Cost of Equity 12.7% 13.7% Cost of Equity 12.7% 13.7% Cost of Debt 3.4% 4.9% Market Value of Equity $5,788 $5,788 Total Debt $1,205 $1,205 Cost of Capital 11.1% 12.1% Cost of Equity 12.7% 13.7% Cost of Debt 3.4% 4.9% Market Value of Equity $5,788 $5,788 Total Debt $3,121 $3,121 Cost of Capital 9.4% 10.6% Raw Beta 0.69 0.93 Spot Risk-Free Rate 2.8% 2.8% Equity Risk Premium 6.0% 6.0% Cost of Equity 7.0% 8.4% Cost of Equity 7.0% 8.4% Cost of Debt 3.4% 4.9% Market Value of Equity $5,788 $5,788 Total Debt $3,121 $3,121 Cost of Capital 5.7% 7.2% Cost of Equity 7.0% 8.4% Cost of Debt 3.4% 4.9% Market Value of Equity $5,788 $5,788 Total Debt $1,205 $1,205 Cost of Capital 6.4% 7.8%

Management Projections: AM EBITDA Capital Expenditures Total DCF LP DCF per Unit ___________________________________ Source: Management projections ($ in millions, unless otherwise noted) 76 $989 $1,222 $1,413 $1,642 $851 $1,105 $1,229 $1,409 $892 $1,143 $1,338 $1,465 $1,128 $1,431 $1,588 $1,051 $1,296 $1,383 $800 $900 $1,000 $1,100 $1,200 $1,300 $1,400 $1,500 $1,600 $1,700 2019 2020 2021 2022 $989 $1,222 $1,413 $1,642 $851 $1,105 $1,229 $1,409 $1,128 $1,431 $1,588 $892 $1,143 $1,338 $1,465 $1,051 $1,296 $1,383 $800 $900 $1,000 $1,100 $1,200 $1,300 $1,400 $1,500 $1,600 $1,700 2019 2020 2021 2022 Prior AM Base Case Prior AM Downside Case New AM Upside Case New AM Base Case New AM Downside Case $815 $719 $430 $352 $488 $506 $272 $194 $769 $827 $348 $141 $838 $450 $344 $695 $382 $262 $100 $200 $300 $400 $500 $600 $700 $800 $900 2019 2020 2021 2022 $849 $1,034 $1,222 $1,425 $721 $955 $1,071 $1,233 $728 $928 $1,145 $1,277 $732 $907 $1,223 $1,381 $727 $852 $1,099 $1,199 $700 $800 $900 $1,000 $1,100 $1,200 $1,300 $1,400 $1,500 2019 2020 2021 2022 $2.73 $3.22 $3.72 $4.26 $2.39 $3.01 $3.32 $3.75 $2.42 $2.96 $3.54 $3.89 $2.43 $2.90 $3.74 $4.17 $2.42 $2.75 $3.41 $3.68 $2.00 $2.50 $3.00 $3.50 $4.00 $4.50 2019 2020 2021 2022

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