EXPLANATORY NOTE
DEREGISTRATION OF SECURITIES
This Post-Effective Amendment No. 2 relates to Registration Statement No. 333-182460 on Form
S-8 (the Registration Statement), filed by EQM Midstream Partners, LP, a Delaware limited partnership (EQM), with the Securities and Exchange Commission (the SEC) on June 29, 2012, pertaining to the
registration of 2,000,000 common units representing limited partner interests of EQM under the EQT Midstream Services, LLC 2012 Long-Term Incentive Plan, as amended by Post-Effective Amendment No. 1 to the Registration Statement, filed by EQM
with the SEC on February 22, 2019, changing the name of the EQT Midstream Services, LLC 2012 Long-Term Incentive Plan to the Amended and Restated EQGP Services, LLC 2012 Long-Term Incentive Plan.
On June 15, 2020, the limited partners of EQM approved that certain Agreement and Plan of Merger, dated as of February 26, 2020 (the
Merger Agreement), by and among Equitrans Midstream Corporation, a Pennsylvania corporation (Equitrans Midstream), EQM LP Corporation, a Delaware corporation and a wholly owned subsidiary of Equitrans Midstream (EQM LP), LS Merger Sub, LLC, a
Delaware limited liability company and a wholly owned subsidiary of EQM LP (Merger Sub), EQM and EQGP Services, LLC, a Delaware limited liability company, a wholly owned subsidiary of Equitrans Midstream and the general partner of EQM. Pursuant to
the terms of the Merger Agreement, Merger Sub merged with and into EQM (the Merger), with EQM continuing and surviving as an indirect, wholly owned subsidiary of Equitrans Midstream following the Merger.
The Merger became effective on June 17, 2020, upon the filing of the Certificate of Merger with the Secretary of State of the State of
Delaware. In connection with the completion of the Merger, EQM terminated all offerings of securities pursuant to the Registration Statement. In accordance with undertakings made by EQM in the Registration Statement to remove from registration, by
means of a post-effective amendment, any of the securities that had been registered for issuance that remain unsold at the termination of such offering, EQM hereby removes from registration all of such securities of EQM registered but unsold under
the Registration Statement.