Vertiv Holdings Co

During the fourth quarter of 2025, Edward Monser, a member of the Company's Board, adopted a "Rule 10b5-1 trading arrangement" as such each term is defined in Item 408(a) of Regulation S-K. The Rule 10b5-1 trading arrangement, adopted by Mr. Monser on December 5, 2025, is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act, provides for the exercise of options and same day sale of up to 77,294 shares of Company Class A common stock and will remain in effect until the earlier of (1)December 20, 2026; (2) the first date on which all trades have been executed or all orders relating to such trades have expired; or (3) upon written notice by Mr. Monser or the broker to terminate or modify the Rule 10b5-1 trading arrangement subject to and in compliance with the Company's insider trading policy and applicable securities laws.

We have adopted an insider trading policy applicable to our directors, officers, employees and certain other persons that we believe is reasonably designed to promote compliance with insider trading laws, rules, and regulations, and the listing rules of the NYSE. A copy of the Company’s insider trading policy is included as Exhibit 19 to this Annual Report.