619 material Form 8-K filings that 507 companies we cover made with the SEC in December 2025, each read and summarized by AI: what happened, the key figures, whether it reads positive or negative for shareholders, and how big a deal it is (impact 1-5). All of them were written later, when past filings were added: a selection, not every 8-K of the month (see the note below).
Gesher Acquisition Corp. II, a Nasdaq-listed special purpose acquisition company, said its Chief Financial Officer and director Sagi Dagan resigned from both roles effective December 31, 2025, and that the resignation was not due to any disagreement with the company. The board appointed Caroline Fu as Deputy CFO effective December 2, 2025, and as CFO effective January 1, 2026, and she signed a joinder to the existing letter agreement on waivers and voting for business combinations.
Sagi Dagan submitted his resignation as CFO and board member on December 1, 2025, effective December 31, 2025.
The board accepted the resignation and appointed Caroline Fu Deputy CFO on December 2, 2025, and CFO effective January 1, 2026.
Ms. Fu has served as a consultant to the company since August 2025, working on its search and diligence of potential target companies.
Ms. Fu signed a joinder to the March 20, 2025 letter agreement covering redemption-right waivers and voting in favor of an initial business combination.
Ciena renewed change in control severance agreements with its executive officers effective November 30, 2025, as part of a routine three-year review after the prior agreements expired that day. The company says the severance benefits are unchanged, with the main revisions being clarifications on clawback rights and equity treatment under Section 409A.
New agreements run through November 30, 2028, unless terminated earlier
Severance benefits are unchanged; CEO Gary B. Smith's protection period is 18 months after a change in control, versus 12 months for other officers
Changes include clarifying that the agreements do not limit the Executive Compensation Clawback Policy and language on Section 409A equity treatment
Parsons Corporation's board elected Robert H. Smith as a director effective December 1, 2025, and increased the board size to 12 members. Smith, former CEO of Blue Origin, joins as a Class I director with a term expiring at the 2026 annual meeting. The filing describes the appointment as adding relevant aerospace and government experience, though it gives no financial figures.
Robert H. Smith elected to the board effective December 1, 2025, as a Class I director
Board size increased to 12 members; term expires at the 2026 annual meeting of stockholders
Smith was CEO of Blue Origin from 2017 through January 2024 and has served on Parsons' Strategic Advisory Board since April 2024
Smith will receive cash and equity compensation under the non-employee director policy
Boeing's board elected Bradley D. Tilden, former chairman, president and CEO of Alaska Air Group, as a director effective December 3, 2025. He will serve on the Aerospace Safety and Finance committees and join the company's nonemployee director compensation program.
Tilden was elected by the board on December 1, 2025, effective December 3, 2025.
He will serve on the Aerospace Safety Committee and the Finance Committee.
Tilden is 64 and spent 31 years at Alaska Air Group, becoming its CEO in 2012.
The filing says Tilden will be the 10th new director added since 2019 and the 12th board member.
Caesars Entertainment said director Don R. Kornstein has decided to resign from the Board effective December 31, 2025. The filing states his decision is not the result of any disagreement with the company.
Don R. Kornstein informed the Executive Chairman of his resignation on December 3, 2025.
Resignation takes effect December 31, 2025.
The filing says the resignation is not due to any disagreement with the company.
Two Alnylam directors, Michael W. Bonney and Carolyn Bertozzi, resigned from the board effective December 2, 2025, and the board cut its size from eleven to ten seats. The board also elected Stuart A. Arbuckle as a non-employee director, effective January 5, 2026, with a $75,000 annual cash retainer and a $600,000 stock option grant. The filing states that the resignations did not stem from any disagreement with the company on its operations, policies or practices.
Michael W. Bonney and Carolyn Bertozzi resigned from the board effective December 2, 2025; the filing states no disagreement with the company caused either resignation
Board size reduced from eleven to ten directors
Stuart A. Arbuckle elected as a Class I director effective January 5, 2026, with a $75,000 annual cash retainer and a stock option grant with a $600,000 grant date fair value
Dr. Bertozzi is joining the board of Eli Lilly effective December 8, 2025, and will continue as a scientific advisor to Alnylam
Equinix said Chief Financial Officer Keith Taylor intends to retire in 2026 after 27 years with the company. He will stay as CFO until a successor is appointed, then serve as a part-time Special Advisor through March 1, 2027, and the company is considering internal and external candidates.
Taylor joined Equinix in 1999 and will remain CFO until a successor is appointed.
Transition Agreement dated December 2, 2025 sets his Special Advisor salary at $48,000 per year for about 20 hours per week.
He will not earn a bonus for any plan year after 2025, but previously granted equity awards continue to vest.
FMC Corporation disclosed that director Anthony DiSilvestro resigned from its Board of Directors and all committees, effective immediately, on December 3, 2025. He cited increased professional commitments after being appointed Chief Financial Officer of Keurig Dr Pepper Inc. on November 25, 2025, along with scheduling conflicts with FMC board and committee meetings. The filing does not name a replacement, and the departure is a board change rather than a change in financial results or guidance.
Resignation from the FMC Board and all committees, effective immediately, notified December 3, 2025
Reason given: new role as CFO of Keurig Dr Pepper Inc., appointed November 25, 2025
Also cited: scheduling conflicts with FMC board and committee meeting dates
FMC thanked DiSilvestro for his service; the filing names no successor
AppFolio disclosed a separation agreement with Matt Mazza, its former Chief Trust Officer, who departed on November 14, 2025. The agreement provides severance and related benefits conditioned on a release of claims and continued compliance with restrictive covenants.
Mazza receives $315,000, equal to nine months of base salary, paid through regular biweekly payroll
A pro-rated fiscal 2025 bonus of $219,462 is payable in a lump sum
Company will pay or reimburse COBRA premiums for up to nine months, and Executive Medical Reimbursement coverage continues through March 31, 2026 (up to $100,000 in eligible expenses)
Old National Bancorp said Commercial Banking CEO Jim Sandgren intends to retire in April 2026, after a career of nearly 35 years with the company. The filing states that he has held roles including President and COO and Southern Region CEO, and it names no successor for the commercial banking role. For shareholders, this is a senior leadership change in the company's commercial banking business, and the filing contains no financial figures tied to it.
Sandgren, Commercial Banking CEO, intends to retire in April 2026; the announcement was made December 3, 2025.
Sandgren has been with Old National for nearly 35 years and previously served as President and COO and Southern Region CEO.
President and COO Tim Burke said Sandgren will work to ensure the smoothest possible transition for the commercial bank team and clients over the coming months.
Reinsurance Group of America said its Executive Vice President and Chief Investment Officer, Leslie Barbi, informed the company on December 1, 2025 that she intends to retire effective April 15, 2026. The filing does not name a successor or describe the reasons for the departure.
Leslie Barbi is Executive Vice President and Chief Investment Officer.
Retirement is effective April 15, 2026; she informed the company on December 1, 2025.
Barbi is a named executive officer in the proxy statement filed April 10, 2025.
Trex Company appointed B. Andrew Rose, former President and CEO of Worthington Enterprises, as a director effective December 3, 2025. He will serve on the Audit and Compensation Committees, and the Board will have ten directors, nine of whom are independent, and the filing says the change is part of an ongoing board refreshment effort.
B. Andrew Rose appointed director effective December 3, 2025; board appointment made December 1, 2025
Rose to serve on the Audit and Compensation Committees; board will have ten directors, nine independent
Rose will stand for election at the 2026 annual meeting; director Ronald Kaplan, serving since 2008, will not stand for re-election
Briefs are written by AI from the filing text and can contain mistakes — open the filing before acting on anything. Impact (1-5) and tone are the AI's reading of the filing for shareholders, not a price forecast. Not investment advice.
Briefs marked “Written later” were written in November 2026 for filings that were by then more than three weeks old, so months before mid-October 2026 hold a selection: every material 8-K of the past year for the 100 largest companies we cover and the last 15 important 8-Ks of every other one. Briefs the number check holds back are not shown or counted. Also: the last 45 days, briefs by company, A–Z and the live SEC filings wire.