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).
HF Sinclair terminated Executive Vice President and Chief Financial Officer Atanas Atanasov on May 13, 2026, effective immediately. Atanasov had been on leave since February 24, 2026, and Vivek Garg has served as acting CFO since that date, so the company is now moving from an interim arrangement to a termination.
Termination of Atanas Atanasov as EVP and Chief Financial Officer, effective May 13, 2026
Atanasov may receive severance under the Company's Severance Pay Plan if he meets its conditions
Atanasov on leave since February 24, 2026; Vivek Garg serving as acting CFO since that date
First Interstate BancSystem said its Executive Vice President and Chief Operations Officer, Kristina Robbins, was terminated without cause effective immediately on May 11, 2026, and moved into an Executive Advisor role reporting to CEO James Reuter. The CEO is expected to handle COO duties until a successor is named, which matters to shareholders because the company's operations leadership is changing and no permanent replacement has been named in the filing.
Kristina Robbins' COO employment was terminated without cause, effective May 11, 2026 (announced that day).
Robbins will serve as Executive Advisor to CEO James Reuter, expected to end August 1, 2026, unless ended earlier.
CEO James Reuter is expected to perform COO duties until a successor is appointed; the filing names no successor.
Robbins will keep her current compensation and benefits during the advisory period under a Transition and Separation Agreement dated May 11, 2026.
Toll Brothers said Robert Parahus will retire as President and Chief Operating Officer effective June 30, 2026, and Executive Vice President Seth J. Ring will succeed him. Ring will also join the Board, which the filing says will increase to 11 members, and Parahus will stay on as a senior advisor through June 30, 2027.
Seth J. Ring, age 46, succeeds Robert Parahus as President and COO effective June 30, 2026, and joins the Board with a term expiring at the 2027 annual meeting.
Ring's compensation includes a $1,000,000 base salary, a fiscal 2026 targeted bonus of $1,750,000, and an annual equity award totaling $3,750,000, all pro-rated for fiscal 2026.
Parahus will receive total compensation of $1,850,000 as a senior advisor, half in periodic cash payments and half in a long-term equity award.
Allegro MicroSystems expanded its board to ten members and elected Robert J. Willett as a Class III director effective May 13, 2026, with seats on the Audit and Compensation Committees. Directors Susan D. Lynch and Richard R. Lury will leave the board at the August 5, 2026 annual meeting after deciding not to stand for reelection, and the filing states neither departure stems from a disagreement with the company. The changes reshape board composition, and the filing discloses no financial results.
Robert J. Willett elected to the board effective May 13, 2026, and appointed to the Audit and Compensation Committees
Board expanded from nine to ten seats under the Second Amended and Restated Stockholders Agreement dated July 29, 2024, with Sanken Electric Co., Ltd.
Susan D. Lynch (notified May 11, 2026) and Richard R. Lury (notified May 13, 2026) will not stand for reelection at the August 5, 2026 annual meeting
Board determined Willett is independent and an audit committee financial expert; he previously served 14 years as CEO of Cognex Corporation
Kevin M. Warsh resigned from the UPS Board of Directors automatically when the Senate confirmed him as Chairman of the Federal Reserve Board of Governors on May 13, 2026, as he had previously said he would. UPS states his decision was not due to any disagreement with the company on its operations, policies or practices.
Kevin M. Warsh's board resignation took effect on May 13, 2026, upon his Senate confirmation as Fed Chairman.
Warsh had advised UPS of his planned resignation in an earlier 8-K filed February 6, 2026.
UPS says the resignation was not due to any disagreement with the company.
Myomo's board appointed Joseph M. Manko Jr. as a director effective May 9, 2026, filling a seat that brings the board to seven directors. Manko is the founder and Senior Principal of Horton Capital Management LLC, which the filing describes as a significant shareholder in the company, so the appointment links a major shareholder directly to the board.
Joseph M. Manko Jr., 60, was appointed effective May 9, 2026, as a Class I director serving until the 2027 annual meeting.
Manko is Senior Principal of Horton Capital Management LLC (Horton Fund), which he founded in 2013 and which is a significant shareholder in Myomo.
Manko has not been appointed to any board committee and has an indemnification agreement with the company.
Non-chair directors receive a $60,000 annual cash retainer and an annual restricted stock unit grant with a $85,000 grant date fair value; Manko will be paid the same way after the 2026 annual meeting.
Werner Enterprises director Carmen A. Tapio retired from the Board effective May 12, 2026, and stated the decision did not involve any disagreement with the company. At the same day's annual meeting, stockholders elected four directors, approved executive compensation on an advisory basis, and ratified KPMG LLP as the auditor for 2026.
Carmen A. Tapio retired from the Board effective May 12, 2026, with no disagreement cited
Stockholders elected Diane K. Duren, Derek J. Leathers, Michelle D. Livingstone and M. Gayle Packer as directors at the May 12, 2026 annual meeting
Advisory say-on-pay proposal was approved with 54,000,280 votes for and 1,369,015 against
KPMG LLP was ratified as the independent registered public accounting firm for the year ending December 31, 2026
WM's Board promoted Tara Hemmer, an WM veteran since 1999, to Executive Vice President and Chief Operating Officer, replacing John Morris, who voluntarily resigned from that role and remains President. Healthcare Solutions leader Rafael Carrasco will retire on July 17, 2026, and that business will report directly to Morris. The filing describes a leadership change and a compensation package for Hemmer, but gives no financial results.
Tara Hemmer, age 53, promoted to EVP and Chief Operating Officer; base salary raised to $850,000 with a 105% target annual cash incentive
Hemmer receives RSUs with a $575,000 grant value on May 20, 2026, vesting 34%, 33% and 33% over three years
Rafael Carrasco, SVP Enterprise Strategy and President of WM Healthcare Solutions, retires effective July 17, 2026
John Morris voluntarily resigned as Chief Operating Officer and remains WM President
On May 7, 2026, Mettler-Toledo's Compensation Committee approved 2026 long-term incentive awards for its named executive officers, split into equal May and November 2026 grants. The May grant, dated May 12, 2026, raised the CEO's target LTI value by about 6.25% versus 2025 and the other named executive officers' by about 12.5%, which shows how the company is compensating its leadership team.
Awards mix one-third performance share units, one-third non-qualified stock options and one-third restricted stock units, with half granted in May 2026 and half in November 2026.
May 2026 grant to CEO Patrick Kaltenbach: 838 PSUs, 2,005 stock options and 810 RSUs, based on the May 12, 2026 closing price.
RSUs carry a 3-year cliff vesting schedule; vesting for PSUs and options is unchanged.
AptarGroup said it appointed Aditya J. Gandhi as Vice President and Chief Accounting Officer, effective June 8, 2026, succeeding Daniel Ackerman, who has taken another leadership role within the Aptar Finance organization. Gandhi most recently served as chief accounting officer of Sonoco Products Company and will report to CFO Vanessa Kanu. The filing is a routine leadership change in the finance function and includes no financial results or guidance.
Aditya J. Gandhi, age 46, appointed Vice President and Chief Accounting Officer, effective June 8, 2026
Gandhi succeeds Daniel Ackerman, who steps down as chief accounting officer and principal accounting officer on the same date
Gandhi previously served as chief accounting officer of Sonoco Products Company from August 2022 to May 2026
Offer letter includes a one-time sign-on bonus of $105,000 and a one-time equity award with a grant-date fair value of $715,000
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.