 CANONSBURG, Pa.--BUSINESS WIRE-- ETRN--Equitrans Midstream Corporation NYSE: ETRN, today, announced financial and operational results for the first quarter 2021. Included in the Non-GAAP Disclosures section of this news release are important disclosures regarding the use of non-GAAP supplemental financial measures, including information regarding their most comparable GAAP financial measure. Q1 2021 Highlights: Delivered first quarter 2021 results ahead of guidance Raised full-year 2021 adjusted 