Rich Thomas R. 4

What Happened Rich Thomas, President — Rentals of Custom Truck One Source, was granted 24,796 shares (reported as an award/ acquisition, code A) on Feb 23, 2026. The reported price per share is $0.00 (award/issuance rather than a purchase), so the immediate cash value reported is $0. These units were certified as earned based on performance for the period ending Dec 31, 2025 but remain subject to a time-based vesting condition through Dec 31, 2026.

Key Details

• Transaction date: 2026-02-23; Transaction code: A (award/acquisition)
• Shares awarded: 24,796; Reported price: $0.00; Reported immediate value: $0
• Footnote: PSU award earned for performance period ending 12/31/2025; vests time-based on 12/31/2026 (per filing footnote F1)
• Shares owned after transaction: Not disclosed in the provided filing excerpt
• Filing date: 2026-03-26 — the Form 4 was filed ~31 days after the transaction (later than the typical 2-business-day deadline)

Context These were performance stock units (PSUs) certified as earned and converted to share awards, but they remain subject to additional time-based vesting and are not fully vested or necessarily transferable until 12/31/2026. An award (code A) is different from a market purchase or sale and does not directly signal buying or selling activity by the insider. The late filing may simply reflect administrative delay but is noted by regulators and can affect disclosure timeliness for investors.