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

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

Summary

• Michael Cannon-Brookes, Atlassian's Co-CEO, Director, and 10% Owner, sold Class A Common Stock.
• The transactions occurred on October 1, 2025.
• Sales were executed under a Rule 10b5-1 trading plan adopted on February 20, 2025.
• A total of 7,665 shares were sold across multiple transactions.
• Weighted-average sale prices ranged from $149.6221 to $162.04 per share.
• Following these transactions, Michael Cannon-Brookes indirectly beneficially owns 482,895 Class A Common Stock shares through CBC Co Pty Limited as trustee for the Cannon-Brookes Head Trust.

Sentiment

Score: 5

Explanation: The filing reports routine insider stock sales executed under a pre-arranged 10b5-1 trading plan, which is a neutral event for market sentiment as it indicates planned liquidity or diversification rather than a reactive decision based on new information.

Positives

• Transactions were conducted under a pre-arranged Rule 10b5-1 trading plan, indicating planned sales rather than reactive ones, which enhances transparency and mitigates concerns about opportunistic insider trading.

Negatives

• Significant insider selling by a co-founder and CEO, totaling 7,665 shares, could be perceived negatively by some investors, despite being pre-planned.

Risks

• Potential for negative market perception due to insider selling, although the existence of a 10b5-1 plan generally mitigates this risk.

Future Outlook

N/A

Industry Context

N/A

Related Party Transactions

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

Stakeholder Impact

• Shareholders: May observe insider selling, but the pre-arranged 10b5-1 plan typically mitigates concerns about management's confidence in the company's future performance.

Key Dates

Recommendation

The reported transactions are routine insider sales executed under a pre-arranged Rule 10b5-1 trading plan. Such planned sales typically do not reflect a change in management's outlook on the company's fundamentals and are often for personal liquidity or diversification. Therefore, these transactions alone do not warrant a change in investment recommendation.

Keywords

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