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).
M3-Brigade Acquisition VI Corp. appointed Frank M. Garrison, Jr. as an independent director on December 2, 2025, and placed him on the Audit and Compensation Committee. The filing describes a letter agreement and an indemnity agreement he signed with the company, with copies attached as exhibits. The filing does not describe financial results or a change in control, so the event is administrative in nature.
Board appointed Frank M. Garrison, Jr. as an independent director effective December 2, 2025
Garrison joined the Audit and Compensation Committee effective December 2, 2025
Garrison entered a letter agreement and an indemnity agreement with the company on December 2, 2025
Agreements are filed as Exhibits 10.1 and 10.2; the filing states no other arrangements or Item 404(a) transactions
IDEX Corporation appointed Sean M. Gillen, currently CFO of AAR CORP., as Senior Vice President and Chief Financial Officer effective January 5, 2026, replacing interim CFO Akhil Mahendra, who returns to his prior role as Vice President, Corporate Development. The company also said Senior Vice President and Chief Human Resources Officer Melissa S. Flores will resign effective December 19, 2025, and that it plans to fill that role externally.
Sean M. Gillen starts as CFO on January 5, 2026; he served as CFO of AAR CORP. from January 2019.
Offer terms include a $625,000 base salary, an 85% target incentive, a $3,000,000 new hire restricted stock award and a $325,000 sign-on bonus.
Melissa S. Flores, a named executive officer, departs effective December 19, 2025, to pursue another employment opportunity.
Akhil Mahendra had served as interim CFO since May 2025.
ESAB appointed Dr. Sébastien Martin, an Associate Professor of Operations at Northwestern's Kellogg School of Management, as a director effective January 1, 2026, and he will join the Audit Committee. The company also said director Patrick Allender will retire at its 2026 annual meeting of stockholders, with no disagreement with the company cited. The filing contains no financial results, so the change is administrative and governance-related for shareholders.
Dr. Sébastien Martin appointed director effective January 1, 2026; Board size increases from nine to ten members.
Dr. Martin joins the Audit Committee effective January 1, 2026, and has served as an external AI advisor to ESAB since February 2025.
Patrick Allender will retire as a director at the 2026 annual meeting of stockholders; the company says it is not due to any disagreement.
The Board determined Dr. Martin is independent under NYSE listing standards.
Avantor's board elected Sanjeev Mehra, co-founder and managing partner of Periphas Capital, as a director on December 4, 2025. His initial term runs until the 2026 Annual Meeting of Stockholders, and the filing says he meets NYSE and Exchange Act independence standards.
Mehra is 66 and was a Goldman Sachs partner from 1998 to 2017; he also serves on the board of OPENLANE, Inc.
Non-employee director pay includes a $95,000 annual cash retainer, prorated for 2025, and restricted stock units with a $210,000 grant date fair value.
The restricted stock units are scheduled to vest in full one year from the grant date, subject to continued board service.
The filing reports no arrangements with other persons for his selection and no material related-party interest.
PTC announced that Jennifer DiRico, currently CFO of Commvault Systems, will become PTC's Executive Vice President and Chief Financial Officer effective January 1, 2026, succeeding Kristian Talvitie, whose last day is December 31, 2025. The company also affirmed its full fiscal 2026 and first fiscal quarter 2026 guidance given on November 5, 2025, which signals no change to its outlook.
Jennifer DiRico appointed CFO effective January 1, 2026; announced December 4, 2025 with a November 30, 2025 appointment date
DiRico's fiscal 2026 annual salary and target bonus are each $575,000, prorated; signing bonus of $255,000
Kristian Talvitie's last day as CFO is December 31, 2025; his departure is not tied to any disagreement with PTC
PTC affirmed guidance for fiscal year ending September 30, 2026 and the quarter ending December 31, 2025
AAR CORP. said Chief Financial Officer Sean M. Gillen will resign effective December 11, 2025, to pursue another opportunity outside the aviation industry, and Vice President of Financial Operations Sarah L. Flanagan will serve as interim CFO. The filing states the departure is not the result of any disagreement with the company, and Gillen will remain an employee through December 19, 2025 to assist the transition.
Sean M. Gillen notified AAR of his resignation on December 1, 2025, effective December 11, 2025
Sarah L. Flanagan, age 54, named Interim CFO effective December 11, 2025; she has been Vice President, Financial Operations, since 2017
Gillen remains an employee through December 19, 2025 to assist with the transition
CEO John M. Holmes said Gillen played a key role in executing the strategy to focus the portfolio on higher growth, higher margin businesses
Commvault said Chief Financial Officer Jennifer DiRico will leave at the end of the calendar year to pursue an opportunity in another industry, and the company has started a search for her successor. Until a new CFO is in place, CEO Sanjay Mirchandani will oversee a newly formed Office of the CFO with Kevin White and Danielle Abrahamsen, and the company says its outlook is unchanged.
DiRico notified the company on November 30, 2025, and will resign at the end of the calendar year.
The filing says her departure is not related to any disagreement, including on accounting, disclosures, internal controls, management or operations.
Mirchandani will oversee the Office of the CFO with Kevin White, Vice President of Finance, and Danielle Abrahamsen, Chief Accounting Officer.
The company says there are no changes to the outlook from its October 28, 2025 second quarter results and expects to report third quarter fiscal 2026 results at the end of January 2026.
Stryker said Spencer Stiles, currently Group President of Orthopaedics, will become President and Chief Operating Officer effective January 1, 2026, with responsibility for the company's global businesses, strategy and mergers and acquisitions. Dylan Crotty, now President of Instruments, will succeed Stiles as Group President, Orthopaedics on the same date.
Stiles becomes President and COO effective January 1, 2026, and will lead global businesses, strategy and M&A
Stiles's annualized base salary rises to $1,000,000 with a bonus target of 100% of base salary
Crotty becomes Group President, Orthopaedics effective January 1, 2026, with base salary rising to $700,000 and a bonus target of 85%
Board committee recommendation for February 2026 long-term incentive awards: about $6,000,000 for Stiles and about $3,000,000 for Crotty
Boise Cascade said CEO Nate Jorgensen will retire effective March 2, 2026, and remain on the board. The board elected Chief Operating Officer Jeff Strom, age 58, as CEO effective March 3, 2026, with a base salary of $975,000 and a 120% short-term incentive target. The filing describes the change as planned succession, though it reports no financial results.
Nate Jorgensen retires as CEO effective March 2, 2026, and continues as a director
Jeff Strom, COO since January 2025, becomes CEO effective March 3, 2026
Strom's base salary is $975,000 with a 120% annual short-term incentive target
The company does not plan to backfill the chief operating officer role
Nucor's Board appointed Chief Financial Officer Stephen Laxton as President and Chief Operating Officer effective January 1, 2026, while Chief Operating Officer David Sumoski retires, with his retirement effective June 13, 2026. Laxton will also remain CFO until the company appoints a successor, and Chair and CEO Leon Topalian continues in his roles, so shareholders will see a change in the company's senior operating and finance leadership.
Stephen D. Laxton, CFO since 2022, becomes President and COO effective January 1, 2026, with his annual base salary increased to $1,000,000
David A. Sumoski steps down as COO on January 1, 2026, stays on as an Executive Vice President and advisor, and retires June 13, 2026
Laxton remains CFO until a successor is appointed, and Nucor says it will conduct a search for a new CFO
Leon J. Topalian continues as Chair and Chief Executive Officer
World Acceptance Corporation said Executive Vice President and Chief Branch Operations Officer D. Clinton Dyer will retire effective March 31, 2026, after 30 years with the company. Senior Vice President of Strategy and Analytics J. Tobin Turner will take over branch operations responsibilities during the transition, and the company approved severance-type payments tied to a termination without cause under Dyer's employment agreement.
Retirement effective March 31, 2026; Dyer joined after 30 years of service
Severance-type package includes $550,000 paid over 24 months plus 18 months of COBRA premiums and full vesting of time-based equity awards
J. Tobin Turner, Senior Vice President of Strategy and Analytics, leads branch operations as interim head during the transition
Iridium Communications appointed Louis M. Alterman as an independent director effective immediately, expanding the board to twelve members. The board also declared a cash dividend of $0.15 per share, payable December 31, 2025, to stockholders of record as of December 15, 2025.
Louis M. Alterman joins the board effective December 4, 2025; his initial term runs to the 2026 annual meeting.
Alterman has been president and CEO of Stratix Corporation since 2019 and was CFO of Rackspace from 2017 to 2019.
Cash dividend of $0.15 per share; payable December 31, 2025, to holders of record on December 15, 2025.
Halliburton appointed Jeffrey Shannon Slocum, currently president of the Eastern Hemisphere, as executive vice president and chief operating officer effective January 1, 2026, and added him to the 13-member board as a management director. Slocum will be responsible for global operations, business development, health, safety and environment, and global technology, reporting to chairman, president and CEO Jeff Miller. The change shifts operating responsibility to a new leader and expands the board, though the filing contains no financial results or guidance.
Slocum's base salary is a minimum of $1,000,000 a year under his new executive agreement, effective January 1, 2026.
The board increases from 12 to 13 directors; Slocum's initial term runs until the 2026 Annual Meeting of Shareholders.
Rami Yassine, currently senior vice president for the Middle East North Africa region, succeeds Slocum as president, Eastern Hemisphere, with a minimum base salary of $800,000.
Deere increased its board from 10 to 11 directors and elected Brian Sikes, Chair, President and CEO of Cargill, effective December 4, 2025. The filing also says Raj Kalathur, President of John Deere Financial and Chief Information Officer, will retire effective January 31, 2026. The filing reports no financial results, so the changes do not by themselves show a change in Deere's performance.
Brian Sikes elected to Deere's board effective December 4, 2025; board size rises from 10 to 11
Sikes appointed to the Compensation and Corporate Governance committees
Raj Kalathur to retire as President, John Deere Financial and Chief Information Officer, effective January 31, 2026
The filing states no related party transactions between Sikes and Deere requiring disclosure
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.