Montrose Environmental Group, Inc. 8-K

What Happened

• Montrose Environmental Group, Inc. filed a Certificate of Amendment with the Delaware Secretary of State on April 17, 2026 to change its legal name to Onterris, Inc.; the change became effective immediately upon filing. The company filed the change in an 8-K on April 21, 2026 and issued a press release announcing the name change the same day.
• The Board also amended the company’s bylaws to reflect and implement the name change; both the certificate amendment and bylaw amendment became effective on April 17, 2026.

Key Details

• Effective date of legal name change: April 17, 2026.
• New trading name and ticker: Onterris, Inc., ticker symbol “ONT” — expected to begin trading under ONT on the NYSE on May 4, 2026.
• No change to the company’s CUSIP and no change to holders’ voting or other rights in the outstanding common stock.
• The Board approved the amendment under Section 242 of the Delaware General Corporation Law; stockholder approval was not required.

Why It Matters

• This is a corporate rebranding: the company’s legal and trading names will change, but the underlying shares, rights, and listing (NYSE) remain the same. Investors should note the new ticker (ONT) for trading and portfolio records beginning May 4, 2026.
• There are no reported changes to operations, financials, governance rights, or share structure in the filing — the action is procedural and administrative.