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

Atlassian CEO and Co-Founder Michael Cannon-Brookes sold 7,665 shares of Class A Common Stock on October 24, 2025, under a pre-arranged 10b5-1 trading plan.

Summary

• Michael Cannon-Brookes, CEO, Co-Founder, Director, and 10% Owner of Atlassian Corp (TEAM), reported sales of Class A Common Stock.
• A total of 7,665 shares were sold across multiple transactions on October 24, 2025.
• The sales were executed at weighted-average prices ranging from $162.5042 to $167.5 per share.
• These transactions were conducted pursuant to a Rule 10b5-1 trading plan adopted by Mr. Cannon-Brookes on February 20, 2025.
• Following these transactions, Mr. Cannon-Brookes indirectly beneficially owns 352,590 shares of Class A Common Stock through CBC Co Pty Limited as trustee for the Cannon-Brookes Head Trust.

Sentiment

Score: 6

Explanation: The sentiment is neutral to slightly positive. While insider selling can be perceived negatively, the execution under a Rule 10b5-1 plan mitigates concerns, suggesting a planned financial management activity rather than a lack of confidence in the company's future.

Positives

• The transactions were executed under a pre-arranged Rule 10b5-1 trading plan, indicating a scheduled liquidity event rather than a reaction to new, undisclosed negative information about the company.

Negatives

• Insider selling, even when pre-planned, reduces the direct ownership stake of a key executive and founder, which some investors might interpret as a slight reduction in alignment of interests with shareholders.

Risks

• No specific new risks were identified in this Form 4 filing beyond the general implications of insider share sales.

Future Outlook

The filing does not contain any forward-looking statements or guidance regarding the company's future performance or strategic direction.

Industry Context

This Form 4 filing reports a routine insider stock sale under a pre-arranged trading plan, which is a common practice for executives to manage personal finances and diversify holdings. It does not provide specific insights into broader industry trends or competitive landscape.

Related Party Transactions

• Shares are held by CBC Co Pty Limited as trustee for the Cannon-Brookes Head Trust, indicating indirect beneficial ownership through a related entity.

Stakeholder Impact

• Shareholders: A minor reduction in direct insider ownership, which is a common occurrence for wealth diversification and generally not a significant concern when executed under a 10b5-1 plan.

Key Dates

Recommendation

The insider sale by Michael Cannon-Brookes, while reducing his direct stake, was conducted under a pre-arranged Rule 10b5-1 trading plan. This suggests a routine personal financial management decision rather than a signal of deteriorating company fundamentals. Without additional information on company performance or strategic shifts, this transaction alone does not warrant a change in investment thesis, thus a 'hold' recommendation is appropriate.

Keywords

Atlassian, TEAM, Michael Cannon-Brookes, Insider Trading, Form 4, Stock Sale, 10b5-1 Plan, Equity Transaction