PARK OHIO HOLDINGS CORP

During the quarter ended March 31, 2026, no director or officer (as defined in Rule 16a-1(f) promulgated under the Exchange Act) of the Company adopted orterminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement” (as each term is defined in Item 408 of Regulation S-K).

On May 5, 2026, the Compensation Committee of the Board of Directors of the Company adopted the 2026 Supplemental Executive Retirement Plan of Park-Ohio Industries, Inc., which is an unfunded deferred compensation plan for key employees (the “Supplemental Plan”). Participants in the account balance feature of the Company’s qualified pension plan (the “Pension Plan”), including the Company’s named executive officers, may be credited with unfunded supplemental retirement benefits under the Supplemental Plan based on the portion of their annual compensation above the annual compensation limit set by the IRS (the “IRS Limit”). The Supplemental Plan is designed to restore benefits for participants who are restricted due to the IRS Limit applicable to the Pension Plan and, beginning in 2026, any eligible pay earned by participants in excess of the IRS Limit will generate pay credits, at the same rate applicable to the Pension Plan, to their balance in the Supplemental Plan (“Pay Credits”). Participants become vested in the Supplemental Plan benefits after five years of service with the Company, which are credited from their start date. In addition, participants will be credited with an initial amount in their Supplemental Plan account balances, reflecting, among other things, years of prior service and the amount of prior retirement benefits excluded because of the IRS Limit (“Restoration Credit”). The Restoration Credits for the Company’s named executive officers are as follows: Matthew V. Crawford, Chairman, Chief Executive Officer and President - $275,000; Patrick W. Fogarty, Vice President and Chief Financial Officer - $370,000; and Robert D. Vilsack, Chief Legal and Administrative Officer, Corporate Secretary - $370,000.

These Supplemental Plan benefits are expected to have an immaterial impact on the Company’s financial position and results of operations. The foregoing description of the Supplemental Plan is qualified in its entirety by reference to the full text of such plan and the related amendment to the Pension Plan, which are filed as Exhibits 10.1 and 10.2, respectively, to this Quarterly Report on Form 10-Q, and which are incorporated herein by reference thereto.