[Form 4] OneStream, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Ken Hohenstein, Chief Revenue Officer of OneStream, Inc. (OS), reported insider transactions dated 08/18/2025. The Form 4 shows an acquisition of a stock option for 20,000 shares with an exercise price of $10.65 and a corresponding entry classifying the option as exercisable through an award covering 20,000 underlying shares. On the same date the filing reports a sale of 20,000 Class A common shares at $21.56. Following the transactions, Hohenstein directly beneficially owned 1,003,163 shares and is associated with an additional 790,279 indirectly held shares via the Hohenstein Purple Elephant Trust. Sales were made under a Rule 10b5-1 plan adopted November 13, 2024.

Positive

• Sales executed under a Rule 10b5-1 plan, indicating pre-planned trading and stronger compliance with insider trading rules
• Significant continuing ownership: combined direct and indirect holdings total approximately 1,793,442 shares, aligning the officer with shareholder interests
• Option grant documented with clear vesting schedule, providing transparency on future potential dilution and incentives

Negative

• Sale of 20,000 shares reduced direct holdings (though remaining direct ownership remains large)
• Indirect holdings via trust may concentrate voting power—nature of control is noted but not further detailed in the filing

Insights

Financial Analyst

TL;DR: Insiders exercised option-based compensation and executed a planned sale; overall ownership remains substantial at >1.7 million shares when combining direct and indirect holdings.

The reported option grant and the simultaneous sale of 20,000 shares are routine insider compensation and liquidity actions. The exercise price of $10.65 versus the sale price of $21.56 indicates the insider realized proceeds from previously granted equity. The filing notes continued significant economic and voting exposure via direct ownership of ~1.0 million shares plus ~790k held through a trust, which signals sustained alignment with company equity. Transactions were executed under a 10b5-1 plan, reducing market-timing concerns.

Corporate Governance Expert

TL;DR: Disclosure follows standard governance practices: a 10b5-1 plan sale and option vesting schedule are documented; ownership concentration remains high.

The Form 4 discloses that sales were effected under a pre-established Rule 10b5-1 trading plan, which supports compliance with insider trading rules. Footnotes clarify option vesting cadence and indirect holdings through an irrevocable trust, providing transparency around control and potential voting power. The signature by an attorney-in-fact is properly executed. These elements are consistent with good governance and clear insider reporting.

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)
08/18/2025

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	08/18/2025		M		20,000	A	$10.65	1,023,163(1)	D
Class A Common Stock	08/18/2025		S(2)		20,000	D	$21.56	1,003,163(1)	D
Class A Common Stock								790,279	I	See Footnote(3)

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	08/18/2025		M			20,000	(4)	03/05/2033	Class A Common Stock	20,000	$0	218,508	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. 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.

4. 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.

	/s/ Holly Koczot, attorney-in-fact	08/20/2025
	** 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).
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.

FAQ

What transactions did Ken Hohenstein report on the OneStream (OS) Form 4?

The Form 4 reports an acquisition of a 20,000-share stock option$10.65 and a sale of 20,000 Class A shares at $21.56, both dated 08/18/2025.

How many OneStream shares does Ken Hohenstein beneficially own after the reported transactions?

Following the transactions, Hohenstein directly beneficially owned 1,003,163 Class A shares and is associated with 790,279 shares indirectly through the Hohenstein Purple Elephant Trust.

Were the share sales subject to an insider trading plan?

Yes. The filing states the sales were effected pursuant to a Rule 10b5-1 trading plan adopted on November 13, 2024.

What are the terms and vesting details for the reported option?

The option covers 20,000 underlying shares with an exercise price of $10.65. Footnotes state one-fourth vested on February 15, 2024 and 1/48th vests monthly thereafter, subject to continued service.

Who signed the Form 4 on behalf of the reporting person?

The Form 4 was signed by Holly Koczot, attorney-in-fact on 08/20/2025.