Custom Truck One Source, Inc. — Director's Dealing 2025

Jan 3, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Custom Truck One Source, Inc. (CTOS)
CIK: 0001709682
Period of Report: 2024-12-31

Reporting Person: Rich Thomas R. (President - Rentals)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2024-12-31	Common Stock	M	18050	—	Acquired	242828	Direct
2024-12-31	Common Stock	F	10886	$4.81	Disposed	231942	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2024-12-31	Performance Stock Unit	$	M	9025	Disposed		Common Stock (9025)	Direct
2024-12-31	Performance Stock Unit	$	M	9025	Disposed		Common Stock (9025)	Direct

Footnotes

F1: Each performance stock unit represents a contingent right to receive one share of the Issuer's common stock.

F2: Shares withheld to satisfy tax obligations arising out of vesting of the Reporting Person's performance stock units.

F3: Each performance stock unit represents a contingent right to receive one share of the Issuer's common stock. The performance stock units will vest based on the attainment of certain performance conditions.