CTOS (NYSE: CTOS) sales president exercises RSUs, receives 100,000-unit award

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

Custom Truck One Source, Inc. President – Sales Joe P. Ross reported equity compensation activity involving restricted stock units and common shares of CTOS. On April 1, 2026, he exercised restricted stock units covering 75,000 shares of common stock, and the company withheld 33,788 shares at $6.62 per share to satisfy tax obligations arising from vesting.

Following these transactions, Ross directly held 377,493 shares of common stock and indirectly held 282,449 shares through Joseph P. Ross Holding Company, LLC. He also received a new grant of 100,000 restricted stock units, which vest in four equal annual installments beginning on April 1, 2027, subject to continued service and potential partial acceleration upon achievement of specified corporate milestones.

Insider Trade Summary

75,000 shares exercised/converted

Mixed 6 txns

Insider Ross Joe P.

Role President - Sales

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Unit	50,000	$0.00	--
Exercise	Restricted Stock Unit	25,000	$0.00	--
Grant/Award	Restricted Stock Unit	100,000	$0.00	--
Exercise	Common Stock	75,000	$0.00	--
Tax Withholding	Common Stock	33,788	$6.62	$224K
holding	Common Stock	--	--	--

Holdings After Transaction: Restricted Stock Unit — 50,000 shares (Direct); Common Stock — 411,281 shares (Direct); Common Stock — 282,449 shares (Indirect, By Joseph P. Ross Holding Company, LLC)

Footnotes (1)

Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock. Shares withheld to satisfy tax obligations arising out of vesting of the Reporting Person's restricted stock units. The restricted stock units vest in four equal annual installments beginning on April 1, 2024. The restricted stock units vest in four equal annual installments beginning on April 1, 2026. The restricted stock units vest in four equal annual installments beginning on April 1, 2027, subject to continued service on the applicable vesting date and potential partial acceleration upon the achievement of certain corporate milestones.

Key Figures

RSUs exercised into common stock: 75,000 shares Shares withheld for taxes: 33,788 shares at $6.62 New RSU grant: 100,000 units +2 more

5 metrics

RSUs exercised into common stock 75,000 shares Derivative exercises reported on April 1, 2026

Shares withheld for taxes 33,788 shares at $6.62 Tax-withholding disposition related to RSU vesting

New RSU grant 100,000 units Grant vesting in four annual installments from April 1, 2027

Direct common stock holdings 377,493 shares Total direct CTOS shares after transactions

Indirect common stock holdings 282,449 shares Held through Joseph P. Ross Holding Company, LLC

Key Terms

Restricted Stock Unit, tax obligations, indirect, corporate milestones

4 terms

Restricted Stock Unit financial

"Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock."

A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.

tax obligations financial

"Shares withheld to satisfy tax obligations arising out of vesting of the Reporting Person's restricted stock units."

indirect financial

"total_shares_following_transaction": "282449.0000", "direct_or_indirect": "I""

corporate milestones financial

"potential partial acceleration upon the achievement of certain corporate milestones."

Form 4 Insider Transactions: What Each Field Means →

04/03/2026 - 06:07 PM

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^*

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)
04/01/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	04/01/2026		M		75,000⁽¹⁾	A	$0	411,281	D
Common Stock	04/01/2026		F		33,788⁽²⁾	D	$6.62	377,493	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Stock Unit	⁽¹⁾	04/01/2026		M			50,000	⁽³⁾	⁽³⁾	Common Stock	50,000	$0	50,000	D
Restricted Stock Unit	⁽¹⁾	04/01/2026		M			25,000	⁽⁴⁾	⁽⁴⁾	Common Stock	25,000	$0	75,000	D
Restricted Stock Unit	⁽¹⁾	04/01/2026		A		100,000		⁽⁵⁾	⁽⁵⁾	Common Stock	100,000	$0	100,000	D

Explanation of Responses:

1. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.

2. Shares withheld to satisfy tax obligations arising out of vesting of the Reporting Person's restricted stock units.

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

4. The restricted stock units vest in four equal annual installments beginning on April 1, 2026.

5. The restricted stock units vest in four equal annual installments beginning on April 1, 2027, subject to continued service on the applicable vesting date and potential partial acceleration upon the achievement of certain corporate milestones.

	By: /s/ Paul M. Jolas, Attorney-in-fact	04/03/2026
	** 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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transactions did CTOS executive Joe P. Ross report?

Joe P. Ross reported exercising restricted stock units into 75,000 CTOS common shares and a tax withholding disposition of 33,788 shares. He also received a new grant of 100,000 restricted stock units as part of his equity compensation on April 1, 2026.

How many Custom Truck One Source (CTOS) shares does Joe P. Ross hold after these transactions?

After the reported transactions, Joe P. Ross directly held 377,493 CTOS common shares. In addition, he indirectly held 282,449 common shares through Joseph P. Ross Holding Company, LLC, reflecting both his personal and entity-related ownership positions disclosed in the filing.

What was the purpose of the 33,788 CTOS shares disposed of by Joe P. Ross?

The 33,788 CTOS shares were withheld to satisfy tax obligations triggered by the vesting of Ross’s restricted stock units. This tax-withholding disposition, at a price of $6.62 per share, is a non-market mechanism and does not represent an open-market stock sale.

What new equity award did Joe P. Ross receive from Custom Truck One Source (CTOS)?

Ross received a grant of 100,000 restricted stock units tied to CTOS common stock. These units vest in four equal annual installments starting April 1, 2027, contingent on his continued service and potential partial acceleration if certain corporate milestones are achieved.

How do the restricted stock units reported by Joe P. Ross convert into CTOS common stock?

Each restricted stock unit represents a contingent right to receive one CTOS common share. As units vest over time, they convert into common stock, increasing Ross’s share ownership, subject to any share withholding to cover associated tax obligations at vesting.

What indirect holdings in CTOS stock are associated with Joe P. Ross?

The filing shows an indirect holding of 282,449 CTOS common shares attributed to Joseph P. Ross Holding Company, LLC. This entry reflects shares held through the related LLC, separate from Ross’s directly owned 377,493 common shares after the reported transactions.