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

Atlassian Co-CEO Michael Cannon-Brookes sold a total of 7,665 shares of Class A Common Stock on October 8, 2025, under a pre-arranged 10b5-1 trading plan.

Summary

• Michael Cannon-Brookes, Atlassian's Co-CEO, Co-Founder, Director, and 10% Owner, reported the sale of Class A Common Stock.
• On October 8, 2025, a total of 7,665 shares were sold across four separate transactions.
• The sales were executed at weighted-average prices ranging from $149.7189 to $152.6292 per share.
• These transactions were conducted under a Rule 10b5-1 trading plan, which was adopted on February 20, 2025.
• Following these sales, Michael Cannon-Brookes indirectly beneficially owns 444,570 shares of Class A Common Stock through CBC Co Pty Limited as trustee for the Cannon-Brookes Head Trust.

Sentiment

Score: 5

Explanation: The sentiment is neutral. While it's an insider sale, the execution under a pre-arranged 10b5-1 plan suggests a scheduled financial management activity rather than a reaction to new company-specific negative news. It neither signals strong confidence nor a lack thereof in the company's immediate future.

Positives

• The transactions were executed pursuant to a pre-arranged Rule 10b5-1 trading plan, indicating a scheduled sale for personal financial management rather than a reaction to new negative company information.

Negatives

• Insider selling by a key executive and significant owner, even if pre-planned, can sometimes be perceived negatively by the market as it reduces the insider's direct equity exposure to the company.

Risks

• No specific risks related to company operations or financial health were mentioned in this Form 4 filing, which primarily reports insider transactions.

Future Outlook

No forward-looking statements or guidance regarding the company's performance or strategic direction were provided in this insider transaction report.

Management Comments

• The transactions were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 20, 2025.

Industry Context

This filing reports a routine insider stock transaction and does not contain information directly related to broader industry trends or competitive landscape. Insider sales, even pre-planned, are a common occurrence for executives managing personal finances and diversification.

Related Party Transactions

• Shares are held indirectly by CBC Co Pty Limited as trustee for the Cannon-Brookes Head Trust, which is a common structure for beneficial ownership by executives.

Stakeholder Impact

• Shareholders may interpret the insider sale differently; some may view it as a routine diversification, while others might see it as a reduction in insider confidence, potentially influencing short-term trading sentiment.

Key Dates

Recommendation

The sale of shares by a Co-CEO, even under a 10b5-1 plan, is a reduction in insider ownership. While the pre-planned nature mitigates the negative signal often associated with insider selling, it does not provide a strong catalyst for a 'buy' recommendation. It suggests personal financial planning rather than a strong conviction about the company's immediate upside or downside, thus a 'hold' recommendation is appropriate for investors to monitor future developments.

Keywords

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