Custom Truck EVP awarded 16,739 CTOS shares

Custom Truck One Source, Inc. reported that EVP, General Counsel & Secretary Paul M. Jolas acquired 16,739 shares of Common Stock as a stock award at a price of $0.00 per share.

Rhea-AI Filing Summary

Custom Truck One Source, Inc. reported that EVP, General Counsel & Secretary Paul M. Jolas acquired 16,739 shares of Common Stock as a stock award at a price of $0.00 per share. The award represents performance stock units earned for a performance period ending on December 31, 2025, certified on February 23, 2026. These shares remain subject to time-based vesting until December 31, 2026. Following this grant, Jolas directly holds 50,458 shares of Common Stock.

Insider Trade Summary

Grant/Award: 16,739 shares

Grant/Award 1 txn

Insider JOLAS PAUL M

Role EVP, General Counsel & Sec.

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	16,739	$0.00	$0.00

Holdings After Transaction: Common Stock — 50,458 shares (Direct)

Footnotes (1)

1. F1. 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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Custom Truck One Source (CTOS) EVP Paul M. Jolas report on this Form 4?

Paul M. Jolas reported acquiring 16,739 shares of Custom Truck One Source Common Stock as a stock award at no cash cost. The shares were earned under performance stock units and increase his direct holdings to 50,458 shares after the transaction.

How many Custom Truck One Source (CTOS) shares were granted to Paul M. Jolas?

He was granted 16,739 shares of Common Stock tied to performance stock units. These were earned based on achievement of performance criteria for a period ending December 31, 2025, as later certified by the compensation committee.

At what price were the CTOS shares awarded to Paul M. Jolas on this Form 4?

The 16,739 shares of Custom Truck One Source Common Stock were awarded at a price of $0.00 per share. This reflects a compensation-related equity grant, not an open-market purchase, and therefore did not involve cash paid by Jolas.

What vesting conditions apply to the new CTOS shares reported by Paul M. Jolas?

Although earned, the shares remain subject to a time-based vesting condition until December 31, 2026. This means Jolas must satisfy continued service or other conditions through that date before the award fully vests and becomes unrestricted.

How many Custom Truck One Source shares does Paul M. Jolas hold after this transaction?

After the award, Paul M. Jolas directly holds 50,458 shares of Custom Truck One Source Common Stock. This total reflects his updated ownership following the 16,739-share performance stock unit grant reported in the Form 4 filing.

What performance period applied to the CTOS performance stock units granted to Paul M. Jolas?

The performance stock units were earned based on a performance period that ended on December 31, 2025. The compensation committee certified the achievement of performance criteria on February 23, 2026, triggering the share award reported here.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 03/26/2026 - 04:30 PM EDT Learn about SEC filing dates

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^*

JOLAS PAUL M

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, General Counsel & Sec.

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		16,739(1)	A	$0	50,458	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	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)