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

Atlassian Co-CEO Michael Cannon-Brookes sold 7,665 Class A Common Stock shares on November 6, 2025, as part of a pre-arranged 10b5-1 trading plan.

Summary

• Michael Cannon-Brookes, Atlassian's Co-CEO, Director, and 10% Owner, sold a total of 7,665 shares of Class A Common Stock.
• The sales occurred on November 6, 2025, at weighted-average prices ranging from $153.8017 to $159.55 per share.
• These transactions were executed under a Rule 10b5-1 trading plan, which was adopted on February 20, 2025.
• Following these transactions, Cannon-Brookes indirectly beneficially owns 283,605 shares of Class A Common Stock through CBC Co Pty Limited as trustee for the Cannon-Brookes Head Trust.

Sentiment

Score: 5

Explanation: The transaction is a routine insider sale executed under a pre-arranged 10b5-1 plan, which is generally considered neutral. While it represents a reduction in insider ownership, the planned nature mitigates immediate negative sentiment.

Positives

• The transaction was executed under a pre-arranged Rule 10b5-1 trading plan, indicating a planned and systematic approach to share sales rather than an opportunistic or reactive one.

Negatives

• A key insider, the Co-CEO and a 10% owner, reduced their direct beneficial ownership in the company.

Risks

• While executed under a 10b5-1 plan, consistent insider selling by key executives could be perceived negatively by investors, potentially signaling a lack of confidence or a desire to diversify personal holdings.

Future Outlook

Not applicable. This filing reports past transactions, not future guidance.

Management Comments

• This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 20, 2025.

Industry Context

This is an insider transaction report specific to Atlassian and its Co-CEO. It does not directly provide broader industry trends or competitive analysis.

Related Party Transactions

• The sale of Class A Common Stock by Michael Cannon-Brookes, a Director, 10% Owner, and Co-CEO, constitutes a related party transaction.

Stakeholder Impact

• Shareholders: May view the insider sale as a slight negative signal, though the 10b5-1 plan context reduces its impact. It indicates a diversification of personal wealth by a key executive.

Next Steps

• Continued execution of the Rule 10b5-1 trading plan as per its terms.

Key Dates

Keywords

Atlassian, TEAM, Michael Cannon-Brookes, insider trading, Form 4, stock sale, 10b5-1 plan, executive compensation, beneficial ownership