STOCK TITAN

Director at Custom Truck One (NYSE: CTOS) exercises and receives RSUs

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Custom Truck One Source, Inc. director Marshall A. Heinberg reported equity compensation and routine stock activity. On April 1, 2026, he received a grant of 34,605 restricted stock units, each representing one share of common stock, scheduled to vest on March 31, 2027. On March 31, 2026, 48,346 restricted stock units vested and were exercised into 48,346 shares of common stock at no cash exercise price, increasing his direct common stock holdings to 400,548 shares. He also reports indirect ownership of 120,000 shares of common stock held by his spouse.

Positive

  • None.

Negative

  • None.
Insider Heinberg Marshall A
Role Director
Type Security Shares Price Value
Grant/Award Restricted Stock Unit 34,605 $0.00 --
Exercise Restricted Stock Unit 48,346 $0.00 --
Exercise Common Stock 48,346 $0.00 --
holding Common Stock -- -- --
Holdings After Transaction: Restricted Stock Unit — 34,605 shares (Direct); Common Stock — 400,548 shares (Direct); Common Stock — 120,000 shares (Indirect, By Spouse)
Footnotes (1)
  1. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock. The restricted stock units vested in full on March 31, 2026. The restricted stock units will vest on March 31, 2027 and have no expiration date.
RSUs granted 34,605 units Restricted Stock Unit grant on April 1, 2026
RSU vesting and exercise 48,346 units/shares RSUs vested and converted to common stock on March 31, 2026
Exercise price $0.0000 per share Stated price for RSU exercise and resulting common shares
Direct common stock holdings 400,548 shares Direct ownership after March 31, 2026 transactions
Indirect common stock holdings 120,000 shares Indirect ownership by spouse reported as of March 31, 2026
New RSU vesting date March 31, 2027 Vesting date for 34,605 newly granted restricted stock units
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
"transaction_code_description: 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.
vesting financial
"The restricted stock units vested in full on March 31, 2026."
Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.
indirect ownership financial
"Common Stock entry shows indirect ownership with nature of ownership: By Spouse."
grant, award, or other acquisition financial
"transaction_code_description: Grant, award, or other acquisition"
SEC Form 4
FORM 4UNITED 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*
Heinberg Marshall A

(Last)(First)(Middle)
7701 INDEPENDENCE AVE

(Street)
KANSAS CITYONTARIO64125

(City)(State)(Zip)

AUSTRALIA

(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)
XDirector10% 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)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock03/31/2026M48,346A$0(1)400,548D
Common Stock120,000IBy Spouse
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Restricted Stock Unit(1)03/31/2026M48,346 (2) (2)Common Stock48,346$00D
Restricted Stock Unit(1)04/01/2026A34,605 (3) (3)Common Stock34,605$034,605D
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-fact04/02/2026
** Signature of Reporting PersonDate
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 transactions did Marshall Heinberg report at Custom Truck One Source (CTOS)?

Marshall A. Heinberg reported equity compensation activity, including the vesting and exercise of 48,346 restricted stock units into common shares and a new grant of 34,605 restricted stock units, all at a stated price of $0.0000 per unit or share.

How many restricted stock units were granted to the CTOS director in this Form 4?

The director received a grant of 34,605 restricted stock units. Each unit represents a contingent right to receive one share of Custom Truck One Source common stock, providing additional equity-based compensation tied directly to the company’s share performance over time.

When do the newly granted CTOS restricted stock units vest for Marshall Heinberg?

The newly granted restricted stock units will vest on March 31, 2027. Vesting means the director will then be entitled to receive one share of Custom Truck One Source common stock for each unit, assuming he satisfies any applicable service conditions.

How many CTOS shares did the director acquire through RSU vesting and exercise?

On March 31, 2026, 48,346 restricted stock units vested in full and were exercised into 48,346 shares of Custom Truck One Source common stock at a stated price of $0.0000, converting previously granted units into directly owned shares.

What are Marshall Heinberg’s reported CTOS share holdings after these transactions?

After the transactions, the director directly owns 400,548 shares of Custom Truck One Source common stock. He also reports indirect ownership of 120,000 additional shares held by his spouse, reflecting both his personal and related-party positions.

Are the CTOS insider transactions open-market buys or compensation events?

The reported transactions are compensation-related equity events, not open-market purchases or sales. They include a new restricted stock unit grant and the vesting and exercise of existing restricted stock units into common stock at a stated price of $0.0000.