CTOS (NYSE: CTOS) President – Sales awarded 24,796 performance-based shares

Rhea-AI Filing Summary

Ross Joe P. reported acquisition or exercise transactions in this Form 4 filing.

Custom Truck One Source, Inc. reported that President – Sales Joe P. Ross received an equity award tied to past performance. On February 23, 2026, he was granted 24,796 shares of Common Stock at no cost, earned from performance stock units for a period that ended on December 31, 2025.

The company’s compensation committee certified the results on February 23, 2026, and these shares remain subject to time-based vesting until December 31, 2026. After this award, Ross directly holds 336,281 common shares and indirectly holds 282,449 shares through Joseph P. Ross Holding Company, LLC.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Ross Joe P.

Role President - Sales

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	24,796	$0.00	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 336,281 shares (Direct); Common Stock — 282,449 shares (Indirect, By Joseph P. Ross Holding Company, LLC)

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
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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^*

Ross Joe P.

(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)
	President - Sales

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		24,796(1)	A	$0	336,281	D
Common Stock								282,449	I	By Joseph P. Ross Holding Company, LLC

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 CTOS executive Joe P. Ross report on this Form 4?

Joe P. Ross reported receiving 24,796 shares of Custom Truck One Source common stock as an equity award. The shares were earned from performance stock units based on results through December 31, 2025, and certified by the compensation committee on February 23, 2026.

What type of equity award did CTOS grant to Joe P. Ross on February 23, 2026?

The award to Joe P. Ross was 24,796 shares earned from performance stock units. These PSUs were tied to performance criteria over a period ending December 31, 2025, and converted into shares after the compensation committee certified the results on February 23, 2026.

Are the new CTOS shares granted to Joe P. Ross fully vested?

The newly granted 24,796 CTOS shares are not yet fully vested. Although earned based on past performance, they remain subject to a time-based vesting condition that will be satisfied on December 31, 2026, if Ross continues to meet the vesting requirements.

How many CTOS shares does Joe P. Ross hold directly after this Form 4 transaction?

After this equity award, Joe P. Ross directly holds 336,281 shares of Custom Truck One Source common stock. This reflects the addition of 24,796 performance-based shares granted at no cost on February 23, 2026, subject to time-based vesting through December 31, 2026.

What indirect CTOS holdings does Joe P. Ross report on this Form 4 filing?

The filing shows an indirect holding of 282,449 CTOS common shares for Joe P. Ross. These shares are held through Joseph P. Ross Holding Company, LLC, and are reported as indirect ownership in addition to his directly held 336,281 shares following the reported award.

What period did the CTOS performance stock units for Joe P. Ross cover?

The performance stock units that converted into 24,796 CTOS shares covered a performance period ending December 31, 2025. The compensation committee certified achievement of the performance criteria on February 23, 2026, triggering the award, which still vests time-based through December 31, 2026.