Form 4: Atlassian Co-Founder Sells $1.26M in Stock

Atlassian Co-Founder and CEO Michael Cannon-Brookes sold 7,665 shares of Class A Common Stock for approximately $1.26 million through a pre-arranged trading plan.

Summary

• Michael Cannon-Brookes, Co-Founder, CEO, Director, and 10% Owner of Atlassian Corp, sold a total of 7,665 shares of Class A Common Stock.
• The sales occurred on December 18, 2025, at weighted-average prices ranging from $161.49 to $165.726 per share.
• The total value of the shares sold is approximately $1,263,377.
• These transactions were executed pursuant to a Rule 10b5-1 trading plan adopted on February 20, 2025.
• Following these transactions, Michael Cannon-Brookes beneficially owns 61,320 shares indirectly through CBC Co Pty Limited as trustee for the Cannon-Brookes Head Trust.

Sentiment

Score: 5

Explanation: The sentiment is neutral. While insider selling can be perceived negatively, the transaction was conducted under a pre-arranged 10b5-1 plan, which mitigates concerns about it being based on immediate, non-public information. It's a routine liquidity event for an executive.

Positives

• The sales were conducted under a pre-arranged Rule 10b5-1 trading plan, indicating they were not based on immediate, non-public information.

Negatives

• Insider selling, even if pre-planned, can sometimes be perceived negatively by investors as it reduces management's direct stake in the company.

Future Outlook

This Form 4 filing reports insider stock transactions and does not contain forward-looking statements or guidance regarding the company's future performance or outlook.

Industry Context

Insider transactions are a routine part of market activity. While sales by key executives can sometimes be viewed with caution, sales executed under a Rule 10b5-1 plan are generally considered less indicative of management's immediate sentiment about the company's prospects, as they are pre-scheduled.

Related Party Transactions

• Shares are held indirectly by CBC Co Pty Limited as trustee for the Cannon-Brookes Head Trust, which is a related entity to Michael Cannon-Brookes.

Stakeholder Impact

• Shareholders may note the reduction in direct ownership by a key executive, though the pre-planned nature of the sale lessens its immediate interpretative impact.
• The transaction does not directly impact employees, customers, suppliers, or creditors.

Key Dates

Keywords

Atlassian, TEAM, Michael Cannon-Brookes, Insider Trading, Stock Sale, Form 4, Rule 10b5-1, CEO, Director, 10% Owner