PAUL M. JOLAS - 31 Jul 2023 Form 4 Insider Report for Custom Truck One Source, Inc. (CTOS)

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	* Price $	Shares After	Date	Underlying Class	Amount	Ownership	Footnotes
transaction	CTOS	Restricted Stock Unit	Award	$0	+67,500	$0	67,500	31 Jul 2023	Common Stock	67,500	Direct	F1, F2
transaction	CTOS	Restricted Stock Unit	Award	$0	+67,500	$0	67,500	31 Jul 2023	Common Stock	67,500	Direct	F1, F3
transaction	CTOS	Performance Stock Unit	Award	$0	+33,750	$0	33,750	31 Jul 2023	Common Stock	33,750	Direct	F4
transaction	CTOS	Performance Stock Unit	Award	$0	+33,750	$0	33,750	31 Jul 2023	Common Stock	33,750	Direct	F5

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Id	Content
F1	Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.
F2	The restricted stock units will vest in four substantially equal annual installments beginning on April 1, 2024.
F3	The restricted stock units will vest in four substantially equal annual installments beginning on April 1, 2025.
F4	Each performance stock unit represents a contingent right to receive one share of the Issuer's common stock. The performance stock units will vest if the volume-weighted average price per share of the Issuer's common stock achieves certain thresholds over the applicable performance period.
F5	Each performance stock unit represents a contingent right to receive one share of the Issuer's common stock. The performance stock units will vest if the volume-weighted average price per share of the Issuer's common stock achieves certain thresholds over the applicable performance period.