Custom Truck One Source (NYSE: CTOS) CEO receives 40,292-share PSU award

Rhea-AI Filing Summary

Custom Truck One Source, Inc. reported that Chief Executive Officer Ryan McMonagle acquired 40,292 shares of common stock as a performance stock unit award. The units were earned based on performance for a period ending December 31, 2025 and certified on February 23, 2026. These shares remain subject to time-based vesting until December 31, 2026. Following this grant, McMonagle directly holds 629,015 common shares.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider McMonagle Ryan

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	40,292	$0.00	--

Holdings After Transaction: Common Stock — 629,015 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

McMonagle Ryan

(Last) (First) (Middle)

7701 INDEPENDENCE AVE

(Street)

KANSAS CITY MISSOURI 64125

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Custom Truck One Source, Inc. [ CTOS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
02/23/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	02/23/2026		A		40,292(1)	A	$0	629,015	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents an award of performance stock units ("PSUs") earned as a result of the achievement of performance criteria pursuant to PSU awards with a performance period that ended on December 31, 2025, as certified by the compensation committee of the Issuer's board of directors on February 23, 2026. Such shares remain subject to a time-based vesting condition, which will be satisfied on December 31, 2026.

	/s/ Paul M. Jolas, Attorney-in-fact	03/26/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Custom Truck One Source (CTOS) report?

Custom Truck One Source reported its CEO, Ryan McMonagle, received 40,292 common shares as a performance stock unit award. The grant reflects earned performance units that converted into shares, forming part of his equity-based compensation package.

Was the CTOS CEO’s recent Form 4 transaction an open-market stock purchase?

No, the CTOS CEO’s Form 4 transaction reflects a grant of 40,292 performance stock units converting into shares at no cash cost. This is compensation-related, not an open-market buy or sell in the company’s stock.

How many Custom Truck One Source (CTOS) shares does the CEO hold after this grant?

After this grant, CTOS CEO Ryan McMonagle directly holds 629,015 common shares. This updated holding reflects the addition of 40,292 shares from earned performance stock units awarded as part of his compensation.

What are the vesting terms of the CTOS CEO’s new performance stock unit award?

The 40,292 shares were earned based on performance for a period ending December 31, 2025. However, they remain subject to a time-based vesting condition that will be satisfied on December 31, 2026, extending the retention period.

What performance period determined the CTOS CEO’s earned performance stock units?

The earned performance stock units were based on performance criteria over a period that ended on December 31, 2025. The compensation committee certified achievement of those criteria on February 23, 2026, triggering the award of 40,292 shares.