1,796 material Form 8-K filings that 1,448 companies we cover made with the SEC in May 2026, 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).
Gale Klappa completed his service as Chairman of the Board of WEC Energy Group on May 7, 2026, after reaching the retirement age under the company's governance guidelines. The Compensation Committee approved accelerated vesting of about 1,616 unvested restricted shares held by Mr. Klappa, effective the same day, in recognition of his years of service.
Gale Klappa completed his service as Chairman of the Board on May 7, 2026, due to reaching retirement age under company guidelines.
Compensation Committee approved on May 4, 2026 the acceleration of vesting for about 1,616 unvested restricted shares held by Mr. Klappa.
Signet Jewelers' board appointed Jeffrey Gennette, former CEO and Chairman of Macy's, as a director effective May 6, 2026. Director Nancy Reardon will not stand for re-election at the June 26, 2026 annual meeting, and the board will shrink from 12 to 11 members after that meeting. The filing reports no financial results and no changes to operations, so the news mainly affects board composition.
Jeffrey Gennette, 65, was appointed effective May 6, 2026, and joins the Human Capital Management & Compensation Committee and the Finance Committee.
Gennette was CEO of Macy's, Inc. from March 2017 to February 2024 and Chairman from February 2018 to April 2024.
Nancy Reardon, a director since March 2018, will not stand for re-election at the Annual Meeting on June 26, 2026, and the filing says her decision was not due to any disagreement with the Company.
The board temporarily expands to 12 members until the Annual Meeting, then drops to 11.
Six Flags said CFO Brian Witherow and Chief Legal and Compliance Officer Brian Nurse will both leave effective May 8, 2026. Chief Accounting Officer David Hoffman will serve as interim CFO, and the company has not yet named a permanent successor. The filing says the company will provide an update when its CFO succession process is complete, and it was filed alongside a separate first quarter 2026 results release.
Brian Witherow steps down as CFO and Brian Nurse departs as Chief Legal and Compliance Officer, both effective May 8, 2026.
David Hoffman, 57, Chief Accounting Officer, becomes interim CFO effective May 8, 2026, with an additional $20,000 cash payment per month for the role.
Amy Martin Ziegenfuss will become Chief Marketing Officer and Christopher Bennett will become Chief Legal and Compliance Officer, both effective June 3, 2026.
No permanent CFO has been named; the company says its succession process has advanced and it will provide an update when complete.
GDL Fund disclosed that its chairman and portfolio manager, Mario J. Gabelli, was admitted to the hospital for observation and testing after a medical incident on March 19, 2026, and that his condition is improving. The timeline for his return is not yet known, so day-to-day operations will be led by co-CEO Douglas R. Jamieson and new GAMCO President Christopher J. Marangi, with Willis Brucker managing the Fund's portfolio.
Mario J. Gabelli was admitted to the hospital after a medical incident on March 19, 2026; the filing says his condition is improving.
No timeline for Mr. Gabelli's return has been set.
GAMCO named Christopher J. Marangi its President on March 22, 2026, under a succession plan in place for several years.
Willis Brucker will handle day-to-day management of the Fund's portfolio during Mr. Gabelli's absence.
GABELLI UTILITY TRUST disclosed that Chairman and Trustee Mario J. Gabelli was admitted to the hospital for observation and testing after a medical incident on March 19, 2026, and that his condition is improving, though the timeline for his return is not known. Day-to-day operations at the fund's parent company GAMCO continue under co-CEO Douglas R. Jamieson and Christopher J. Marangi, and Kevin V. Dreyer and Marangi lead the fund's portfolio management during his absence.
Mario J. Gabelli was admitted to the hospital after a medical incident on March 19, 2026; his condition is improving.
On March 22, 2026, GAMCO named Christopher J. Marangi its President under a succession plan in place for several years.
Kevin V. Dreyer and Christopher J. Marangi lead the fund's portfolio management team during Mr. Gabelli's absence.
The Fund disclosed that Mario J. Gabelli, its Trustee and Chairman, was admitted to hospital for observation and testing after a medical incident on March 19, 2026, and that his condition is improving but his return date is unknown. Kevin V. Dreyer and Christopher J. Marangi now lead the Fund's portfolio management team in his absence, which matters to shareholders because the day-to-day investment leadership has changed while the timeline for his return remains undetermined.
Mario J. Gabelli was admitted to hospital after a medical incident on March 19, 2026; his condition is improving, but his return timeline is not known.
On March 22, 2026, GAMCO implemented a succession plan naming Christopher J. Marangi President of GAMCO.
Kevin V. Dreyer and Christopher J. Marangi lead the Fund's portfolio management team during Mr. Gabelli's absence.
Douglas R. Jamieson and Christopher J. Marangi will lead GAMCO's day-to-day operations.
The Trust disclosed that Mario J. Gabelli, its trustee and chief investment officer, was admitted to hospital for observation and testing after a medical incident on March 19, 2026. The filing says his condition is improving but his return timeline is unknown, and Kevin V. Dreyer and Christopher J. Marangi now lead the Fund's portfolio management team in his absence.
Mario J. Gabelli was hospitalized for observation and testing after a medical incident on March 19, 2026; his return date is not yet known.
On March 22, 2026, GAMCO implemented a succession plan and named Christopher J. Marangi its President.
Kevin V. Dreyer and Christopher J. Marangi lead the Fund's portfolio management team during Mr. Gabelli's absence.
Day-to-day operations of GAMCO continue under co-CEO Douglas R. Jamieson and Christopher J. Marangi.
The fund disclosed that its trustee and chief investment officer, Mario J. Gabelli, was hospitalized for observation after a medical incident on March 19, 2026, and his return timeline is unknown. Day-to-day portfolio management has shifted to Kevin V. Dreyer and Christopher J. Marangi, and GAMCO's succession plan named Marangi its president on March 22, 2026.
Mario J. Gabelli was admitted to hospital for observation and testing after a March 19, 2026 medical incident; his condition is reported as improving.
Kevin V. Dreyer and Christopher J. Marangi lead the fund's portfolio management team during Mr. Gabelli's absence.
Christopher J. Marangi was named President of GAMCO on March 22, 2026 under a succession plan in place for several years.
The filing gives no timeline for Mr. Gabelli's return.
The fund disclosed that its trustee, chairman and chief investment officer Mario J. Gabelli was admitted to the hospital for observation and testing after a medical incident on March 19, 2026, and that his condition is improving. Christopher J. Marangi, named GAMCO president on March 22, 2026, and co-chief investment officers Kevin V. Dreyer and Marangi now lead portfolio management for the fund while Gabelli is absent.
Mario J. Gabelli was admitted to the hospital after a medical incident on March 19, 2026; his condition is improving, but the timeline for his return is not known.
On March 22, 2026, GAMCO implemented a succession plan and named Christopher J. Marangi president.
Kevin V. Dreyer and Christopher J. Marangi lead the fund's portfolio management team during Gabelli's absence.
Day-to-day GAMCO operations continue under co-CEO Douglas R. Jamieson and Marangi.
The Fund disclosed that Mario J. Gabelli, its Trustee and Chairman and Chief Investment Officer, was admitted to hospital for observation and testing after a medical incident on March 19, 2026, and that his condition is improving with the timeline for his return not yet known. Co-Chief Investment Officers Kevin V. Dreyer and Christopher J. Marangi are leading the Fund's portfolio management team in his absence, which matters to shareholders because day-to-day investment leadership has changed.
Mario J. Gabelli was admitted to hospital after a medical incident on March 19, 2026; his condition is improving, but no return date has been set.
On March 22, 2026, GAMCO implemented a succession plan under which Christopher J. Marangi was named President of GAMCO.
Kevin V. Dreyer and Christopher J. Marangi lead the Fund's portfolio management team during Mr. Gabelli's absence.
Douglas R. Jamieson and Christopher J. Marangi will continue to lead GAMCO's day-to-day operations.
The fund disclosed that its trustee and chief investment officer, Mario J. Gabelli, was hospitalized for observation and testing after a medical incident on March 19, 2026, and his condition is improving, but his return date is unknown. Day-to-day portfolio management is now led by Kevin V. Dreyer and Christopher J. Marangi, and GAMCO's succession plan made Marangi its president on March 22, 2026.
Mario J. Gabelli was admitted to hospital after a medical incident on March 19, 2026; his condition is improving.
Timeline for Mr. Gabelli's return is not yet known.
Kevin V. Dreyer and Christopher J. Marangi lead the Fund's portfolio management team during his absence.
Christopher J. Marangi was named President of GAMCO on March 22, 2026, under a succession plan in place for several years.
The fund disclosed that Mario J. Gabelli, its Trustee and Chairman, was hospitalized for observation and testing after a medical incident on March 19, 2026, and that his condition is improving, though his return timeline is unknown. Christopher J. Marangi and Kevin V. Dreyer now lead the fund's portfolio management team during his absence, and a parent-company succession plan named Marangi GAMCO president on March 22, 2026.
Mario J. Gabelli was admitted to hospital for observation and testing after a medical incident on March 19, 2026; his condition is improving but his return date is not known.
Christopher J. Marangi and Kevin V. Dreyer lead the fund's portfolio management team during Gabelli's absence.
On March 22, 2026, Marangi was named President of GAMCO under a succession plan in place for several years.
Douglas R. Jamieson and Marangi will lead GAMCO's day-to-day operations.
At its May 7, 2026 annual meeting, Peabody stockholders elected ten directors to one-year terms, approved the 2026 Incentive Plan, approved executive pay on an advisory basis, and ratified Ernst & Young LLP as auditor for 2026. The Board also rejected Chair Robert A. Malone's resignation, allowing him to serve one additional year after reaching age 75, subject to re-election at the 2027 annual meeting, and approved a new Vice Chair role.
Ten directors elected for one-year terms; Bob Malone received 85,763,616 votes for and 1,947,648 against.
2026 Incentive Plan approved with 86,289,993 votes for and 1,245,353 against, effective immediately.
Board rejected Chair Robert A. Malone's resignation and authorized him to serve one more year after reaching age 75, subject to re-election in 2027.
Board amended governance guidelines to create a Vice Chair role, with an appointment to follow the 2027 Annual Meeting.
STERIS plc appointed Pierre Boulud, CEO of bioMérieux, to its Board of Directors effective May 5, 2026, and increased the Board from nine to ten members. Director Richard C. Breeden, who has served 18 years, will not stand for reelection at the 2026 Annual General Meeting, and the company said his decision was not due to any disagreement with the company. The filing reports no financial results or guidance changes, so the event mainly affects board composition.
Pierre Boulud was appointed director effective May 5, 2026; the Board increased from nine to ten members.
Richard C. Breeden notified the company on May 1, 2026 that he will not stand for reelection at the 2026 Annual General Meeting, after 18 years as a director.
Boulud has been CEO of bioMérieux since June 2023 and will receive a prorated fee of $76,989 for the rest of the 2025-26 term, paid in career restricted stock units.
Berkshire Hathaway said Charles C. Chang will succeed Marc D. Hamburg as chief financial officer on June 1, 2026, with an annual cash salary of $8 million. The filing also covers a May 2, 2026 annual meeting, where shareholders approved executive pay and rejected a shareholder proposal on workforce oversight, and a May 3, 2026 bylaw update; the 8-K itself does not report first-quarter earnings figures.
Charles C. Chang succeeds Marc D. Hamburg as CFO on June 1, 2026, at an annual cash salary of $8 million.
Berkshire estimates the cost of Hamburg's NetJets flight benefit at about $490,000 per year, for up to 30 flight hours a year through May 31, 2037.
Advisory say-on-pay vote: 403,351 for and 30,251 against at the May 2, 2026 annual meeting.
Shareholder proposal on workforce and human-capital oversight: 65,023 for and 367,387 against, so it did not pass.
A10 Networks disclosed that Sheen Khoury, Executive Vice President, Worldwide Sales and Marketing, was terminated on April 27, 2026, and signed a separation agreement on May 2, 2026. Under the agreement, vesting of 11,667 restricted stock units and 21,385 performance-based restricted stock units will be accelerated, subject to a release of claims and the agreement taking effect.
Sheen Khoury, Executive Vice President, Worldwide Sales and Marketing, was terminated effective April 27, 2026.
Separation Agreement and Release signed May 2, 2026; it takes effect on the eighth day after Khoury signed, unless revoked.
Accelerated vesting covers 11,667 restricted stock units and 21,385 performance-based restricted stock units tied to stock price thresholds.
The filing states no other compensation or benefits will be provided to Khoury in connection with his termination.
Post Holdings reported second-quarter fiscal 2026 net sales of $2.0 billion, up 4.7%, and net earnings of $81.9 million, up 30.8%, and affirmed its fiscal 2026 Adjusted EBITDA outlook of $1,550-$1,580 million. The filing also says Nicolas Catoggio, the current Chief Operating Officer, will become President and Chief Executive Officer on October 1, 2026, while Robert V. Vitale moves to Executive Chairman, and the Board approved a new $600.0 million share repurchase authorization.
Q2 diluted EPS was $1.56, versus $1.03 a year earlier; Adjusted diluted EPS was $1.94, versus $1.41.
Q2 Adjusted EBITDA was $395.0 million, up 14.0% from $346.5 million.
Robert V. Vitale moves from President and CEO to Executive Chairman; Nicolas Catoggio becomes President and CEO, both effective October 1, 2026.
New $600.0 million buyback authorization takes effect May 9, 2026; the existing $500.0 million authorization is cancelled May 8, 2026, with $236.6 million remaining.
Mastercard said its Corporate Controller and principal accounting officer, Sandra Arkell, will become Chief Audit Executive effective August 3, 2026, and Chris Mullett will succeed her in the controller and principal accounting officer roles on that date. The change affects who signs the company's accounting oversight roles, and the filing describes it as an internal move without any change to pay terms beyond standard employee arrangements.
Sandra Arkell moves from Corporate Controller to Chief Audit Executive effective August 3, 2026.
Chris Mullett, age 52, will succeed Arkell as Corporate Controller and principal accounting officer effective August 3, 2026.
Mullett joined Mastercard in November 2017 and has been Chief Financial Officer, Europe since May 2023.
Mullett's compensation is described as a base salary comparable to other employees, with participation in standard company plans.
At the May 7, 2026 annual meeting, Class III director Steven L. Waechter's term ended after he was not renominated under the company's policy requiring directors to be 75 or younger. The board shrank from ten members to nine, and shareholders re-elected three Class III directors, ratified RSM US LLP as auditor for fiscal 2026, and approved executive pay on an advisory basis. The filing says Waechter's departure did not stem from any disagreement with the company, and the votes reflect routine governance matters.
Steven L. Waechter, age 76, was not renominated; his term ended at the May 7, 2026 meeting and the filing cites no disagreement with the company.
The board was reduced from ten to nine members. Gerard A. Fasano joins the Compensation committee and Nicole B. Theophilus joins the NG committee, both effective May 8, 2026.
Melvin F. Parker received 26,771,119 votes for and 1,255,126 against; Ross S. Niebergall received 27,563,152 for; Jeremy C. Wensinger received 27,369,904 for.
Shareholders ratified RSM US LLP as independent auditor for fiscal 2026 with 29,441,872 votes for and 14,187 against.
Benjamin F. Rassieur, III retired from the Commerce Bancshares board effective May 7, 2026, under the company's mandatory retirement requirements. He had served on the board since 1997 and was a member and former chairman of the Audit and Risk Committee.
Benjamin F. Rassieur, III retired from the board effective May 7, 2026
Retirement was due to the company's mandatory retirement requirements
Rassieur had been a board member since 1997
He was a member and former committee chairman of the Audit and Risk Committee
PROG Holdings' board named President and CEO Steve Michaels chairman, effective immediately, succeeding Ray M. Robinson, who was appointed lead independent director. The board also granted Michaels a one-time award of $5 million in restricted stock units, which the company said is intended to retain him as CEO. Separately, the board declared a $0.14 per share quarterly cash dividend, and shareholders re-elected all ten director nominees at the May 6, 2026 annual meeting.
Steve Michaels, President and CEO, elected Chairman of the Board effective May 7, 2026; Ray M. Robinson becomes Lead Independent Director
One-time award of $5 million in restricted stock units to Michaels, vesting ratably on the third, fourth and fifth anniversaries of the grant date
Quarterly cash dividend of $0.14 per share, payable June 2, 2026, to shareholders of record as of May 19, 2026
Non-binding say-on-pay resolution received 31,949,347 votes for and 2,782,090 against at the May 6, 2026 annual meeting
Viasat appointed Shekar Ayyar and Jinhy Yoon to its board on May 6, 2026, and entered into a cooperation agreement with activist investor Carronade Capital Management, LP. The board now has ten members, eight of them independent, and both new directors joined the Strategic Review Committee, which shareholders may watch as a signal of the review's direction.
Shekar Ayyar, CEO of Arrcus, Inc., appointed as an independent Class II director with a term expiring at the 2028 annual meeting
Jinhy Yoon, former PIMCO executive, appointed as an independent Class I director with a term expiring at the 2027 annual meeting
Cooperation agreement includes voting commitments and standstill obligations, and terminates if the board grows to more than ten directors
Both new directors were appointed to the Strategic Review Committee; the agreement is filed as Exhibit 10.1
Protolabs appointed Bernardo Parlange as its newly created Chief Commercial Officer, effective May 18, 2026, and said COO Mike Kenison will retire effective July 1, 2026. The filing discloses leadership changes only and does not include financial results or guidance.
Parlange will oversee global commercial strategy, including sales, marketing, and customer success.
Parlange was most recently Senior Vice President of Sales & Marketing at Fortrex, a Blackstone portfolio company.
Kenison joined Protolabs in 2006 and retires as Chief Operations Officer effective July 1, 2026.
The announcement was made in a press release dated May 7, 2026, filed as Exhibit 99.1.
Shake Shack appointed Michelle Hook as Chief Financial Officer effective May 11, 2026, reporting to CEO Robert Lynch. She previously served as CFO of Portillo's Inc. from December 2020 and spent more than 17 years at Domino's Pizza, Inc. The filing sets out her pay package, including a $625,000 base salary, a 100% target bonus and a $1,200,000 signing equity award, which matter to shareholders as a new CFO takes over financial operations.
Effective date is May 11, 2026; Hook reports to CEO Robert Lynch
Initial annual base salary of $625,000, with a target bonus of 100% of base salary
Signing cash award of $300,000 and signing RSUs with a grant date fair value of $1,200,000, granted July 15, 2026
Severance includes 12 months of base salary continuation if terminated without Cause or resigns for Good Reason
ITT Inc. said its Chief Financial Officer, Emmanuel Caprais, will leave the company for personal reasons effective May 8, 2026, after almost 14 years of service. Treasurer Michael J. Savinelli will serve as interim CFO while the company searches for a successor, and the filing says Caprais's departure is not the result of any disagreement with the company. The change puts a new interim head over finance during the search, which shareholders will want to watch.
Emmanuel Caprais, CFO, departs effective May 8, 2026, and stays as a business advisor to the CEO through July 1, 2026
Michael J. Savinelli, Vice President, Treasurer, Chief Tax Officer & Assistant Secretary, becomes interim CFO effective May 8, 2026
Savinelli received $300,000 of restricted stock units and will get a $25,000 monthly cash stipend while serving as interim CFO
A search for a permanent successor is under way; the filing gives no timeline
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.