CTOS director gains shares through RSU grant and vest

Custom Truck One Source director Paul T. Bader reported equity compensation activity involving restricted stock units and common shares.

Rhea-AI Filing Summary

Custom Truck One Source director Paul T. Bader reported equity compensation activity involving restricted stock units and common shares. He received a grant of 19,225 restricted stock units on April 1, 2026, each representing one future share of common stock and scheduled to vest on March 31, 2027.

On March 31, 2026, a prior award of 26,859 restricted stock units vested in full and was exercised into 26,859 shares of common stock at no cash exercise price. Following these transactions, Bader directly holds 120,663 shares of common stock, and the filing shows only acquisitions, not any share sales.

Insider Trade Summary

26,859 shares exercised/converted

Exercise 3 txns

Insider BADER PAUL T

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Unit	19,225	$0.00	$0.00
Exercise	Restricted Stock Unit	26,859	$0.00	$0.00
Exercise	Common Stock	26,859	$0.00	$0.00

Holdings After Transaction: Restricted Stock Unit — 19,225 contracts (Direct); Common Stock — 120,663 shares (Direct)

Footnotes (3)

1. F1. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.
2. F2. The restricted stock units vested in full on March 31, 2026.
3. F3. The restricted stock units will vest on March 31, 2027 and have no expiration date.

Key Figures

New RSU grant: 19,225 restricted stock units Vested RSUs exercised: 26,859 restricted stock units Common shares held after transactions: 120,663 shares +2 more

5 metrics

New RSU grant 19,225 restricted stock units Granted April 1, 2026; each unit equals one common share

Vested RSUs exercised 26,859 restricted stock units Vested and converted into 26,859 common shares on March 31, 2026

Common shares held after transactions 120,663 shares Direct ownership of Custom Truck One Source common stock after March 31, 2026 exercise

Exercise price for RSU conversion $0.00 per share Restricted stock units converted into common stock at no cash exercise price

Future RSU vesting date March 31, 2027 Scheduled vesting date for the 19,225 newly granted restricted stock units

Key Terms

Restricted Stock Unit, derivative security, vested in full, expiration date

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.

derivative security financial

"Exercise or conversion of derivative security"

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

vested in full financial

"The restricted stock units vested in full on March 31, 2026."

expiration date financial

"The restricted stock units will vest on March 31, 2027 and have no expiration date."

The expiration date is the deadline after which a financial contract, such as an option or a futures agreement, is no longer valid or can be exercised. It matters to investors because it determines the timeframe during which they can take action or benefit from the contract, similar to how a coupon or a food item has a limited period of usefulness. Once the expiration date passes, the contract loses its value or ability to be used.

FAQ

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

What insider transactions did CTOS director Paul T. Bader report on this Form 4?

Paul T. Bader reported only share acquisitions. A prior 26,859-unit restricted stock award vested into 26,859 common shares, and he received a new 19,225-unit restricted stock unit grant as additional equity compensation.

How many CTOS shares does Paul T. Bader hold after these Form 4 transactions?

After the reported transactions, Paul T. Bader directly holds 120,663 shares of Custom Truck One Source common stock. This total reflects settlement of 26,859 vested restricted stock units into common shares with no reported share sales in this filing.

What are the key details of the new CTOS restricted stock unit grant to Paul T. Bader?

Bader was granted 19,225 restricted stock units on April 1, 2026. Each unit represents one share of Custom Truck One Source common stock and, according to the disclosure, the restricted stock units will vest on March 31, 2027 with no stated expiration date.

When did Paul T. Bader’s CTOS restricted stock units vest and convert into common stock?

A prior award of restricted stock units vested in full on March 31, 2026. On that date, 26,859 restricted stock units were exercised and converted into 26,859 shares of Custom Truck One Source common stock at a reported exercise price of zero.

Did the CTOS Form 4 for Paul T. Bader report any share sales or dispositions?

The Form 4 shows no share sales or dispositions. All reported transactions are acquisitions through a new restricted stock unit grant and the exercise of previously granted restricted stock units into 26,859 shares of common stock held directly by Bader.

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

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Accepted by SEC EDGAR 04/02/2026 - 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^*

BADER PAUL T

(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
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/31/2026

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	03/31/2026		M		26,859	A	$0(1)	120,663	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
Restricted Stock Unit	(1)	03/31/2026		M			26,859	(2)	(2)	Common Stock	26,859	$0	0	D
Restricted Stock Unit	(1)	04/01/2026		A		19,225		(3)	(3)	Common Stock	19,225	$0	19,225	D

Explanation of Responses:

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

2. The restricted stock units vested in full on March 31, 2026.

3. The restricted stock units will vest on March 31, 2027 and have no expiration date.

	By: /s/ Paul M. Jolas, Attorney-in-fact	04/02/2026
	** 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)