Custom Truck CEO gets 175,000 new RSUs

Custom Truck One Source CEO Ryan McMonagle reported equity compensation activity.

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Form Type

Rhea-AI Filing Summary

Custom Truck One Source CEO Ryan McMonagle reported equity compensation activity. On April 1, 2026, restricted stock units representing 121,875 shares of common stock were exercised, and 54,906 shares of common stock were withheld at $6.62 per share to cover tax obligations.

Following these transactions, he held 695,984 shares of common stock directly. He was also granted 175,000 new restricted stock units, each convertible into one share of common stock. These RSUs vest in four equal annual installments beginning on April 1, 2027, subject to continued service and potential partial acceleration upon achieving specified corporate milestones.

Insider Trade Summary

121,875 shares exercised/converted

Exercise 5 txns

Insider McMonagle Ryan

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Unit	81,250	$0.00	$0.00
Exercise	Restricted Stock Unit	40,625	$0.00	$0.00
Grant/Award	Restricted Stock Unit	175,000	$0.00	$0.00
Exercise	Common Stock	121,875	$0.00	$0.00
Exercise Price or Tax Liability	Common Stock	54,906	$6.62	$363K

Holdings After Transaction: Restricted Stock Unit — 378,125 contracts (Direct); Common Stock — 695,984 shares (Direct)

Footnotes (5)

F1. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.
F2. Shares withheld to satisfy tax obligations arising out of vesting of the Reporting Person's restricted stock units.
F3. The restricted stock units vest in four equal annual installments beginning on April 1, 2024.
F4. The restricted stock units vest in four equal annual installments beginning on April 1, 2026.
F5. 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: 121,875 shares Shares withheld for taxes: 54,906 shares at $6.62 Common shares held after: 695,984 shares +2 more

5 metrics

RSUs exercised 121,875 shares Restricted stock units converted to common stock on April 1, 2026

Shares withheld for taxes 54,906 shares at $6.62 Tax-withholding disposition tied to RSU vesting

Common shares held after 695,984 shares Direct ownership following April 1, 2026 transactions

New RSU grant 175,000 RSUs Grant vesting in four annual installments from April 1, 2027

RSU-to-share ratio 1:1 Each restricted stock unit equals one share of common stock

Key Terms

Restricted Stock Unit, tax obligations, vest in four equal annual installments, continued service, +1 more

5 terms

Restricted Stock Unit financial

"Each restricted stock unit represents a contingent right to receive one share..."

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..."

vest in four equal annual installments financial

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

continued service financial

"subject to continued service on the applicable vesting date..."

corporate milestones financial

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

FAQ

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

What insider transactions did CTOS CEO Ryan McMonagle report on April 1, 2026?

On April 1, 2026, CTOS CEO Ryan McMonagle exercised restricted stock units for 121,875 shares of common stock. In connection with this vesting, 54,906 shares were withheld at $6.62 per share to satisfy related tax obligations, reflecting routine equity compensation activity.

How many Custom Truck One Source (CTOS) shares does the CEO hold after this Form 4?

After the reported transactions, the CTOS CEO directly holds 695,984 shares of common stock. This figure reflects the vested shares received from restricted stock units, net of the shares withheld to cover tax liabilities associated with the equity compensation vesting event.

What new restricted stock units were granted to the CTOS CEO in this filing?

The CTOS CEO received a grant of 175,000 restricted stock units, each representing a right to one share of common stock. These RSUs vest in four equal annual installments beginning April 1, 2027, subject to continued service and certain corporate milestone conditions for potential partial acceleration.

How do the CTOS CEO’s restricted stock units convert into common stock?

Each restricted stock unit reported for the CTOS CEO represents a contingent right to receive one share of common stock. As the RSUs vest on scheduled dates, they convert into common shares, increasing direct share ownership, subject to any shares withheld to satisfy tax obligations at vesting.

Why were 54,906 CTOS shares withheld in the CEO’s Form 4 filing?

The 54,906 shares of CTOS common stock were withheld to satisfy tax obligations arising from the vesting of the CEO’s restricted stock units. This tax-withholding disposition at $6.62 per share is a non-market transaction and part of the standard equity compensation settlement process.

What is the vesting schedule for the CTOS CEO’s new 175,000 RSU grant?

The 175,000 restricted stock units granted to the CTOS CEO vest in four equal annual installments starting April 1, 2027. Vesting requires continued service on each vesting date and may partially accelerate if specified corporate milestones are achieved, as described in the footnotes.

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

Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 04/03/2026 - 06:08 PM EDT

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)
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		121,875⁽¹⁾	A	$0	750,890	D
Common Stock	04/01/2026		F		54,906⁽²⁾	D	$6.62	695,984	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)
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			81,250	⁽³⁾	⁽³⁾	Common Stock	81,250	$0	81,250	D
Restricted Stock Unit	⁽¹⁾	04/01/2026		M			40,625	⁽⁴⁾	⁽⁴⁾	Common Stock	40,625	$0	121,875	D
Restricted Stock Unit	⁽¹⁾	04/01/2026		A		175,000		⁽⁵⁾	⁽⁵⁾	Common Stock	175,000	$0	175,000	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