Eperjesy Christopher J 4

What Happened
Christopher J. Eperjesy, Chief Financial Officer of Custom Truck One Source, Inc. (CTOS), was granted 27,895 shares (performance stock units) on February 23, 2026. The award is reported at $0.00 per share because these are PSUs earned based on performance for the period ending December 31, 2025; the award remains subject to a time-based vesting condition that will be satisfied on December 31, 2026. This transaction is an award/grant (not a purchase or sale).

Key Details

• Transaction date: February 23, 2026; filing date: March 26, 2026 (filed well after the typical 2-business-day Form 4 window).
• Transaction type/code: A (Award/Grant). Reported price: $0.00; shares acquired: 27,895.
• Footnote: PSUs were earned based on performance for the period ending 12/31/2025 as certified by the compensation committee; they will vest (time-based) on 12/31/2026.
• Shares owned after the transaction: not disclosed in the provided filing excerpt.
• No 10b5-1 plan, tax-withholding, or cashless exercise noted in the filing excerpt.

Context
Performance stock units are compensation awarded for meeting performance targets; they are not an open-market purchase or sale and do not represent an immediate cash investment or disposition. Because these PSUs remain subject to time-based vesting until 12/31/2026, they will not convert to unrestricted shares for almost a year. The late filing may be relevant for monitoring insider reporting timeliness but does not change the nature of the award.