Jonathan D. Mariner - 07 Jul 2025 Form 4 Insider Report for OneStream, Inc. (OS)

Reporting relationship: Director
Issuer ticker: OS
Reported as of: 07 Jul 2025
Net transaction value: -$176,292
SEC form: 4
Accepted by SEC: 09 Jul 2025, 16:17:01 UTC
Prior SEC filing: 13 Jun 2025
Next SEC filing: 06 Aug 2025
Source filing: View source filing
Reporting owner signature: /s/ Holly Koczot, attorney-in-fact

Key filing fact

Jonathan D. Mariner filed Form 4 for OneStream, Inc. (OS) on 09 Jul 2025.

Key facts

This page summarizes Jonathan D. Mariner's Form 4 filing for OneStream, Inc. (OS).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 09 Jul 2025, 16:17.

Change

Previous filing in this sequence was filed on 13 Jun 2025.
Current net transaction value: -$176,292.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001063663 Primary reporting owner

MARINER JONATHAN D

Relationship: Director
Address: C/O ONESTREAM, INC., 191 N. CHESTER STREET, BIRMINGHAM
Signature: /s/ Holly Koczot, attorney-in-fact
Signature date: 09 Jul 2025

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

OS transaction

Class A Common Stock

Sale

Transaction value: $176,292
Shares: -6,630
Change %: -14%
Price: $26.59
Shares after: 40,280
Date: 07 Jul 2025
Ownership: Direct
Footnotes: F1, F2, F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 3 footnotes

Footnote F1

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 28, 2025.

Footnote F2

Represents the weighted average share price of an aggregate total of 6,630 shares sold in the price range of $26.35 to $26.76, 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.

Footnote F3

The shares reported include unvested restricted stock units.