X0508 4 2026-03-06 0 0001674101 Vertiv Holdings Co VRT 0001183480 MONSER EDWARD L C/O VERTIV HOLDINGS CO 505 N. CLEVELAND AVE WESTERVILLE OH 43082 1 0 0 0 1 Class A Common Stock 2026-03-06 4 M 0 38647 12.05 A 55147 D Class A Common Stock 2026-03-06 4 M 0 38647 20.56 A 93794 D Class A Common Stock 2026-03-06 4 S 0 1700 239.34 D 92094 D Class A Common Stock 2026-03-06 4 S 0 3600 240.47 D 88494 D Class A Common Stock 2026-03-06 4 S 0 12127 241.62 D 76367 D Class A Common Stock 2026-03-06 4 S 0 4714 242.20 D 71653 D Class A Common Stock 2026-03-06 4 S 0 2200 243.56 D 69453 D Class A Common Stock 2026-03-06 4 S 0 2067 244.56 D 67386 D Class A Common Stock 2026-03-06 4 S 0 10269 245.65 D 57117 D Class A Common Stock 2026-03-06 4 S 0 13306 246.60 D 43811 D Class A Common Stock 2026-03-06 4 S 0 10162 247.64 D 33649 D Class A Common Stock 2026-03-06 4 S 0 12758 248.56 D 20891 D Class A Common Stock 2026-03-06 4 S 0 2491 249.58 D 18400 D Class A Common Stock 2026-03-06 4 S 0 1900 250.46 D 16500 D Class A Common Stock 918 I See Footnote Stock Option (Right to Buy) 12.05 2026-03-06 4 M 0 38647 0 D 2030-02-07 Class A common stock 38647 0 D Stock Option (Right to Buy) 20.56 2026-03-06 4 M 0 38647 0 D 2031-02-07 Class A common stock 38647 0 D These transactions were automatically effected pursuant to a Rule 10b5-1 trading plan previously adopted by the reporting person on December 5, 2025. These shares were sold in multiple transactions ranging from $238.92 to $239.78. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, and the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote and in footnotes 2 through 13, inclusive. These shares were sold in multiple transactions ranging from $239.97 to $240.94. These shares were sold in multiple transactions ranging from $241.01 to $242.00. These shares were sold in multiple transactions ranging from $242.01 to $242.79. These shares were sold in multiple transactions ranging from $243.04 to $244.00. These shares were sold in multiple transactions ranging from $244.04 to $245.01. These shares were sold in multiple transactions ranging from $245.13 to $246.12. These shares were sold in multiple transactions ranging from $246.13 to $247.12. These shares were sold in multiple transactions ranging from $247.14 to $248.13. These shares were sold in multiple transactions ranging from $248.14 to $249.13. These shares were sold in multiple transactions ranging from $249.14 to $250.10. These shares were sold in multiple transactions ranging from $250.18 to $251.10. Reflects securities held directly by the Reporting Person's spouse. The stock options were fully vested as of the date of the transactions reported herein. /s/ Eric Boxterman, as attorney-in-fact 2026-03-09