Form 4: OneStream Director Sells 18,423 Shares Under 10b5-1 Plan

OneStream Director Jonathan D Mariner sold 18,423 shares of Class A Common Stock for a weighted average price of $20.9 per share on December 2, 2025, pursuant to a pre-arranged trading plan.

Summary

• Jonathan D Mariner, a Director of OneStream, Inc. (OS), reported a sale of Class A Common Stock.
• The transaction involved the disposition of 18,423 shares.
• The shares were sold at a weighted average price of $20.9 per share, with prices ranging from $20.675 to $21.26.
• The sale was executed on December 2, 2025.
• This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Mr. Mariner on February 28, 2025.
• Following the reported transaction, Mr. Mariner beneficially owns 15,086 shares of Class A Common Stock, which includes unvested restricted stock units.

Sentiment

Score: 5

Explanation: The filing reports a routine insider sale executed under a pre-arranged 10b5-1 trading plan, which is generally considered neutral in sentiment as it often reflects personal financial planning rather than a change in outlook on the company.

Industry Context

This filing is a standard disclosure of an insider transaction and does not provide information directly related to broader industry trends or competitive landscape. It reflects an individual director's equity activity.

Stakeholder Impact

• Shareholders may note a director's sale of shares, though executed under a 10b5-1 plan, which typically mitigates negative interpretations regarding management's confidence.

Key Dates

Recommendation

The reported sale by Director Jonathan D Mariner was executed pursuant to a Rule 10b5-1 trading plan adopted several months prior. Such pre-scheduled sales are typically for personal financial planning and do not necessarily reflect a change in the director's confidence in the company's future prospects. Given this context, the transaction itself does not provide a strong signal to alter an investment position, hence a 'hold' recommendation is appropriate.

Keywords

OneStream, OS, Jonathan D Mariner, Insider Sale, Form 4, 10b5-1 Plan, Director Transaction, Equity Sale