OneStream (OS) CRO sells 40,000 shares after option exercise under 10b5-1

Rhea-AI Filing Summary

OneStream, Inc. Chief Revenue Officer reported option exercises and share sales in company stock. On 12/16/2025, the insider exercised stock options for 40,000 shares of Class A common stock at an exercise price of $10.65 per share and sold 40,000 shares of Class A common stock at a weighted average price of $17.21, within a price range of $16.91 to $17.65.

The sales were made under a pre-arranged Rule 10b5-1 trading plan adopted on November 13, 2024. After these transactions, the insider holds 990,961 Class A shares directly, which include unvested restricted stock units, and 790,279 shares indirectly through the Hohenstein Purple Elephant 2019 Irrevocable Grantor Trust. The filing also shows remaining stock options covering 178,508 and 69,210 shares, vesting monthly after initial one-quarter vesting tranches.

Insights

Equity compensation and insider trading analyst

Routine insider option exercise and sale under a Rule 10b5-1 plan.

The Chief Revenue Officer of OneStream, Inc. exercised options for 40,000 Class A shares at an exercise price of $10.65 on 12/16/2025, then sold the same number of shares at a weighted average price of $17.21. The sale was executed under a pre-established Rule 10b5-1 trading plan adopted on November 13, 2024, which is commonly used to structure pre-scheduled trades and reduce concerns about trading on nonpublic information.

Following the transactions, the insider still reports substantial ownership: 990,961 Class A shares held directly (including unvested restricted stock units) and 790,279 shares held indirectly via the Hohenstein Purple Elephant 2019 Irrevocable Grantor Trust, over which the insider may be deemed to have voting and dispositive power. In addition, stock options remain outstanding for 178,508 and 69,210 shares, with one-fourth initially vested on February 15, 2024 and February 15, 2023, respectively, and the balance vesting in equal monthly installments, conditioned on continued service.

These details indicate a mix of liquidity-taking via the sale and continued long-term exposure through sizeable direct, indirect, and option holdings. The reported vesting schedules and expiration dates out to 2033 provide a structured timeline for when additional shares may become exercisable, subject to ongoing service.

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).

X

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^*

Hohenstein Ken

(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)

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

3. Date of Earliest Transaction (Month/Day/Year)
12/16/2025

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	12/16/2025		M		40,000	A	$10.65	1,030,961(1)	D
Class A Common Stock	12/16/2025		S(2)		40,000	D	$17.21(3)	990,961(1)	D
Class A Common Stock								790,279	I	See Footnote(4)

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
Stock Option (right to buy)	$10.65	12/16/2025		M			10,000	(5)	03/05/2033	Class A Common Stock	10,000	$0	178,508	D
Stock Option (right to buy)	$10.65	12/16/2025		M			30,000	(6)	12/04/2031	Class A Common Stock	30,000	$0	69,210	D

Explanation of Responses:

1. The shares reported include unvested restricted stock units.

2. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 13, 2024.

3. Represents the weighted average share price of an aggregate total of 40,000 shares sold in the price range of $16.91 to $17.65, inclusive, by the Reporting Person. The Reporting Person undertakes to provide upon request by the staff of the Securities and Exchange Commission, the issuer or any security holder of the issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

4. Shares held by the Hohenstein Purple Elephant 2019 Irrevocable Grantor Trust (the "Hohenstein Purple Elephant Trust"). The Reporting Person may be deemed to have voting and dispositive power over the shares held by the Hohenstein Purple Elephant Trust.

5. One-fourth of the shares subject to the option vested on February 15, 2024, and 1/48th of the shares subject to the option shall vest each month thereafter, subject to the Reporting Person continuing to be a service provider through the applicable vesting date.

6. One-fourth of the shares subject to the option vested on February 15, 2023, and 1/48th of the shares subject to the option shall vest each month thereafter, subject to the Reporting Person continuing to be a service provider through the applicable vesting date.

	/s/ Holly Koczot, attorney-in-fact	12/18/2025
	** 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).
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FAQ

What insider transaction did OneStream (OS) report on December 16, 2025?

The Chief Revenue Officer of OneStream, Inc. exercised options for 40,000 Class A common shares at $10.65 per share and sold 40,000 Class A shares at a weighted average price of $17.21 on 12/16/2025.

Was the OneStream (OS) insider sale made under a Rule 10b5-1 trading plan?

Yes. The filing states that the 40,000-share sale was effected under a Rule 10b5-1 trading plan adopted by the reporting person on November 13, 2024.

How many OneStream (OS) shares does the insider own after the reported transactions?

After the reported transactions, the insider directly owns 990,961 Class A shares (including unvested restricted stock units) and indirectly owns 790,279 shares through the Hohenstein Purple Elephant 2019 Irrevocable Grantor Trust.

What prices were involved in the OneStream (OS) insider’s option exercise and sale?

The options were exercised at an exercise price of $10.65 per share. The 40,000 shares sold had a weighted average sale price of $17.21, within a stated range of $16.91 to $17.65.

What stock options remain for the OneStream (OS) insider after this Form 4?

Following the transactions, the insider reports remaining stock options for 178,508 shares with an expiration date of 03/05/2033 and 69,210 shares with an expiration date of 12/04/2031, both at an exercise price of $10.65 per share.

How do the OneStream (OS) stock options for the insider vest?

For one option grant, one-fourth vested on February 15, 2024, with 1/48 of the shares vesting monthly thereafter. For the other, one-fourth vested on February 15, 2023, with 1/48 vesting monthly thereafter, each subject to continued service.