Form 4: Atlassian Co-Founder Sells Shares Under 10b5-1 Plan

Atlassian CEO and Co-Founder Michael Cannon-Brookes sold 7,665 Class A Common Stock shares on December 16, 2025, under a pre-arranged 10b5-1 trading plan.

Summary

• Michael Cannon-Brookes, CEO, Co-Founder, Director, and 10% Owner of Atlassian Corp (TEAM), disposed of 7,665 shares of Class A Common Stock.
• The transactions occurred on December 16, 2025, through multiple trades at weighted-average prices ranging from $159.0262 to $162.69 per share.
• These sales were executed pursuant to a Rule 10b5-1 trading plan adopted by Mr. Cannon-Brookes on February 20, 2025.
• Following these transactions, Mr. Cannon-Brookes beneficially owns 76,650 shares of Class A Common Stock indirectly through CBC Co Pty Limited as trustee for the Cannon-Brookes Head Trust.

Sentiment

Score: 4

Explanation: The sentiment is neutral to slightly negative. While insider selling can be perceived negatively, the execution under a pre-arranged 10b5-1 plan mitigates concerns about opportunistic timing, indicating a planned diversification or liquidity event rather than a reaction to adverse company-specific news.

Positives

• The transactions were conducted under a pre-arranged Rule 10b5-1 trading plan, indicating a structured and transparent approach to insider stock sales rather than an opportunistic one.

Negatives

• The sale by a key executive, director, and significant owner reduces their direct beneficial ownership in the company.

Future Outlook

NA

Industry Context

NA

Stakeholder Impact

• Shareholders may note the reduction in beneficial ownership by a key executive, though the 10b5-1 plan suggests a pre-planned action.

Key Dates

Keywords

Atlassian, TEAM, Michael Cannon-Brookes, Insider Trading, Form 4, Stock Sale, 10b5-1 Plan, CEO, Co-Founder