OneStream insider filing: William Koefoed nets $359k via option exercise

Rhea-AI Filing Summary

OneStream, Inc. (OS) – Form 4 insider activity

CFO William A. Koefoed exercised 25,000 stock options on 25-Jul-2025 at an exercise price of $10.65 and immediately sold the resulting shares at $25.00 under a pre-arranged Rule 10b5-1 plan adopted 21-Feb-2025. The gross spread of $14.35 per share represents roughly $359,000 in pre-tax proceeds.

• Transaction code M: option exercise converted options into Class A common shares.
• Transaction code S: disposition of the same 25,000 shares.
• Post-transaction holdings: 237,839 Class A shares (includes unvested RSUs) held directly, plus 170,481 remaining options.

No other material events, earnings data, or company guidance were included in this filing.

Positive

• CFO retains 237,839 shares, preserving strong insider alignment.
• Sale executed under a Rule 10b5-1 plan, reducing governance risk.
• Option exercise injects approximately $266k in cash to the company at $10.65 per share.

Negative

• 25,000-share insider sale may be viewed as a bearish short-term signal.
• Transaction represents ~10% of the CFO’s direct equity stake, indicating partial profit-taking.

Insights

Securities Analyst

TL;DR – Routine 10b5-1 sale; neutral signal, minimal dilution impact.

The CFO monetised 25k shares, but simultaneously exercised 25k options, resulting in no net share change outstanding. He still holds nearly 238k shares and 170k options, aligning incentives with shareholders. The sale was pre-planned, limiting concerns of opportunistic timing. Financially, the company absorbs no cash cost; the exercise price provides $266k to the company while the market absorbs the shares. Overall impact on valuation or float is immaterial.

Corporate Governance Expert

TL;DR – Planned insider sale modestly negative for sentiment but procedurally sound.

Use of a Rule 10b5-1 plan mitigates governance risk; however, any insider sale by a senior officer can pressure short-term sentiment. The continued large personal stake and ongoing vesting schedule suggest long-term alignment. No red flags in disclosure quality or timing.

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).

1. Name and Address of Reporting Person^*

Koefoed William A

(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 Financial Officer

3. Date of Earliest Transaction (Month/Day/Year)
07/25/2025

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	07/25/2025		M		25,000	A	$10.65	262,839(1)	D
Class A Common Stock	07/25/2025		S(2)		25,000	D	$25	237,839(1)	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
Stock Option (right to buy)	$10.65	07/25/2025		M			25,000	(3)	12/04/2031	Class A Common Stock	25,000	$0	170,481	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 February 21, 2025.

3. 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	07/28/2025
	** 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

How many OneStream (OS) shares did the CFO sell on 25-Jul-2025?

He sold 25,000 Class A shares.

At what price were the OS options exercised and shares sold?

Options were exercised at $10.65; the shares were sold at $25.00 each.

What is the CFO’s remaining ownership in OneStream after the transaction?

He now holds 237,839 shares (incl. RSUs) and 170,481 unexercised options.

Was the sale executed under a Rule 10b5-1 trading plan?

Yes. The plan was adopted on 21-Feb-2025, indicating pre-scheduled trades.

Does this Form 4 filing affect OneStream’s outstanding share count?

No material change; exercised options convert but equal number of shares were sold on the open market.