X0306 4/A 2018-11-12 2018-11-14 0 0001747009 Equitrans Midstream Corp ETRN 0001240751 PETRELLI CHARLENE 625 LIBERTY AVENUE, SUITE 2000 PITTSBURGH PA 15222 0 1 0 0 Sr VP & Chief Admin Officer Employee Stock Option (Right to Buy) 33.96 2018-11-12 4 A 0 10371 0 A 2022-01-01 Common Stock 10371 10371 D Employee Stock Option (Right to Buy) 36.55 2018-11-12 4 A 0 10054 0 A 2023-01-01 Common Stock 10054 10054 D Employee Stock Option (Right to Buy) 55.64 2018-11-12 4 A 0 5383 0 A 2024-01-01 Common Stock 5383 5383 D Employee Stock Option (Right to Buy) 46.92 2018-11-12 4 A 0 8233 0 A 2025-01-01 Common Stock 8233 8233 D Employee Stock Option (Right to Buy) 32.31 2018-11-12 4 A 0 11004 0 A 2019-01-01 2026-01-01 Common Stock 11004 11004 D Employee Stock Option (Right to Buy) 40.53 2018-11-12 4 A 0 9421 0 A 2020-01-01 2027-01-01 Common Stock 9421 9421 D Employee Stock Option (Right to Buy) 35.28 2018-11-12 4 A 0 12667 0 A 2021-01-01 2028-01-01 Common Stock 12667 12667 D In connection with the spin-off of Equitrans Midstream Corporation (ETRN) from EQT Corporation (EQT) on November 12, 2018, for each outstanding EQT stock option award held by the Reporting Person immediately prior to the spin-off, the Reporting Person received a stock option award from ETRN. The number of underlying shares and exercise price of each ETRN stock option award were calculated in a manner intended to preserve the aggregate intrinsic value of the original EQT stock option award (based in part on the volume weighted average per-share price of ETRN's common stock during each of the first ten full NYSE trading sessions commencing November 13, 2018). This amendment is being filed to correct the previously disclosed exercise price calculated in respect of each grant. The option has vested as to all shares subject to the grant. /s/ Tobin M. Nelson, Attorney-in-Fact for Charlene Petrelli 2018-12-10