OneStream (OS) CEO’s RSU tax withholding covers 9,258 shares at $23.70

Rhea-AI Filing Summary

OneStream, Inc. CEO and director Thomas Anthony Shea reported a Form 4 showing that 9,258 shares of Class A Common Stock were withheld at $23.70 per share to satisfy tax obligations on restricted stock unit settlement, which the company notes is not a market sale. After this tax-withholding disposition, he directly holds 459,986 shares, including unvested restricted stock units.

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

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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^*

Shea Thomas Anthony

(Last) (First) (Middle)

C/O ONESTREAM, INC.

191 N. CHESTER STREET

(Street)

BIRMINGHAM MI 48009

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
OneStream, Inc. [ OS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	X	10% Owner
X	Officer (give title below)		Other (specify below)
	CEO

3. Date of Earliest Transaction (Month/Day/Year)
03/10/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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
Class A Common Stock	03/10/2026		F		9,258(1)	D	$23.7	459,986(2)	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

Explanation of Responses:

1. Represents shares that have been withheld by the Issuer to satisfy the Reporting Person's tax withholding and remittance obligations in connection with the net settlement of restricted stock units and does not represent a sale by the Reporting Person.

2. The shares reported include unvested restricted stock units.

	/s/ Holly Koczot, attorney-in-fact	03/12/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What insider transaction did OneStream (OS) report for CEO Thomas Anthony Shea?

OneStream reported that CEO Thomas Anthony Shea had 9,258 Class A Common Stock shares withheld. These shares covered tax obligations from net settlement of restricted stock units and, according to the company, this event does not represent an open-market sale by the executive.

Was the OneStream (OS) CEO’s Form 4 transaction a stock sale?

The Form 4 states the transaction was not a sale. Shares were withheld by OneStream to satisfy Thomas Anthony Shea’s tax withholding and remittance obligations tied to restricted stock units, rather than being sold into the open market for discretionary liquidity.

How many OneStream (OS) shares were involved in the CEO’s tax withholding transaction?

The transaction involved 9,258 shares of OneStream Class A Common Stock. These shares were withheld at a reported price of $23.70 per share to cover tax liabilities arising from the net settlement of restricted stock units awarded to the CEO.

How many OneStream (OS) shares does the CEO hold after this Form 4 transaction?

Following the tax-withholding disposition, CEO Thomas Anthony Shea directly holds 459,986 OneStream shares. The filing notes that this total includes unvested restricted stock units, so the reported position reflects both vested and unvested equity awards granted to him.

What does transaction code F mean in the OneStream (OS) Form 4 filing?

Transaction code F indicates payment of an exercise price or tax liability by delivering securities. In this case, 9,258 OneStream shares were withheld by the issuer to satisfy Thomas Anthony Shea’s tax obligations related to restricted stock units, rather than an elective stock sale.