Summit Midstream Corp 8-K

What Happened

• Summit Midstream Corporation (SMC) announced in a Form 8-K (filed Dec 29, 2025) that on Dec 23, 2025 its board unanimously appointed Carolyn J. Stone as an independent director to serve in Class II effective March 16, 2026.
• Ms. Stone will fill the seat being vacated by Marguerite Woung‑Chapman, who notified the board she will retire effective midnight March 15, 2026. Ms. Woung‑Chapman confirmed she has no disagreement with the company regarding its operations, practices, or policies.

Key Details

• Appointment date announced: December 23, 2025; effective date for new director: March 16, 2026.
• Retirement effective: Marguerite Woung‑Chapman effective March 15, 2026.
• Carolyn J. Stone, age 53, is a Certified Public Accountant with material financial and accounting experience: CFO of Civeo Corporation (Nov 2019–Mar 2024); prior roles at Civeo (2014–2019), Synagro Technologies (CFO), and 11 years at Dynegy in senior accounting roles; began career at PriceWaterhouseCoopers.
• No special arrangements or understandings related to her selection; Ms. Stone will be paid under the company’s existing director compensation program.

Why It Matters

• This is a planned, non‑contentious board succession that preserves board independence and adds seasoned financial and audit expertise to Summit’s board, which can strengthen oversight of financial reporting and governance.
• For investors, the change reduces uncertainty about board composition and signals continuity in governance with an experienced accounting professional filling the outgoing director’s seat.