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

Apr 3, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Custom Truck One Source, Inc. (CTOS)
CIK: 0001709682
Period of Report: 2025-04-01

Reporting Person: Ross Joe P. (President - Sales)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-04-01	Common Stock	M	100000	—	Acquired	356998	Direct
2025-04-01	Common Stock	F	45513	$4.20	Disposed	311485	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-04-01	Restricted Stock Unit	$	M	50000	Disposed		Common Stock (50000)	Direct
2025-04-01	Restricted Stock Unit	$	M	50000	Disposed		Common Stock (50000)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	282449	Indirect

Footnotes

F1: Each restricted 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 restricted stock units.

F3: The restricted stock units vest in four equal annual installments beginning on April 1, 2022.

F4: The restricted stock units vest in four equal annual installments beginning on April 1, 2024.