OS Insider Filing: 18,564 Shares to Be Sold via Goldman Sachs

Rhea-AI Filing Summary

Form 144 notice for OneStream, Inc. (OS) reports a proposed sale of 18,564 shares of Common Stock through Goldman Sachs & Co. LLC with an aggregate market value of $370,537.44, slated for sale on 09/03/2025 on NASD. The shares were originally acquired from the issuer on 07/27/2020 when Class C shares converted to Class A; payment was recorded as None. The filing lists four recent open-market sales by Jonathan Mariner totaling 13,260 shares with gross proceeds shown for each sale (two on 07/07/2025 and two on 08/04/2025). The filer certifies no undisclosed material adverse information and includes the standard Rule 10b5-1 reference.

Insights

Securities Analyst

TL;DR: Insider plans a routine sale of 18,564 shares via Goldman Sachs; recent months show multiple smaller disposals.

The filing presents a standard Rule 144 notice reflecting an insider sale of 18,564 shares valued at $370,537.44. The securities were acquired on 07/27/2020 from the issuer via class conversion, indicating no complex consideration. Recent sales by the same person in July and August 2025 total 13,260 shares with documented gross proceeds, showing ongoing liquidity events rather than a single large disposition. From a market-impact perspective, the disclosed amounts are small relative to typical mid-cap free float sizes, suggesting limited price pressure solely from these sales.

Compliance Specialist

TL;DR: Filing appears procedurally complete for Rule 144 disclosure and includes required attestations.

The Form 144 includes required elements: issuer identification, broker name and address (Goldman Sachs & Co. LLC), number of shares, market value, acquisition date and nature, and recent sales in the past three months. The signer affirms absence of undisclosed material adverse information and references Rule 10b5-1 protocol. No payment or complex consideration is reported. For compliance review, the filing flags no immediate irregularities but lacks visible filer CIK/contacts in the excerpt; those should be present in the full submission to ensure complete records.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common Stock	Goldman Sachs & Co. LLC 200 West Street New York NY 10282	18564	370537.44	88136155	09/03/2025	NASD

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common Stock	07/27/2020	Acquired Class C common shares from Issuer; Class C common shares were converted to Class A common shares	The Issuer			18564	07/27/2020	None

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Jonathan Mariner 191 N Chester St Birmingham MI 48009	Common Stock	08/04/2025	1989	47173.91
Jonathan Mariner 191 N Chester St Birmingham MI 48009	Common Stock	08/04/2025	4641	108855.58
Jonathan Mariner 191 N Chester St Birmingham MI 48009	Common Stock	07/07/2025	1989	53084.22
Jonathan Mariner 191 N Chester St Birmingham MI 48009	Common Stock	07/07/2025	4641	123179.1

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does OneStream (OS) Form 144 disclose about the proposed sale?

The notice discloses a proposed sale of 18,564 Common Stock shares valued at $370,537.44 through Goldman Sachs & Co. LLC on 09/03/2025 on NASD.

When and how were the shares to be sold acquired?

The shares were acquired on 07/27/2020 from the issuer as Class C common shares that converted to Class A common shares; the filing shows no cash payment recorded for that acquisition.

Has the seller recently sold other OneStream shares?

Yes. The filer, Jonathan Mariner, reported four sales in the past three months totaling 13,260 shares on 07/07/2025 and 08/04/2025 with gross proceeds listed for each transaction.

Which broker is handling the proposed sale?

The broker listed is Goldman Sachs & Co. LLC, located at 200 West Street, New York, NY 10282.

Does the filing include any Rule 10b5-1 plan adoption date?

No specific Rule 10b5-1 plan adoption date is provided in the excerpt; the form contains the standard statement referencing such plans if applicable.