Form 4: Atlassian Co-Founder Sells $1.28M in Stock

Atlassian Co-Founder Michael Cannon-Brookes sold 7,665 shares of Class A Common Stock for approximately $1.28 million on August 15, 2025, as part of a pre-arranged 10b5-1 trading plan.

Summary

• Michael Cannon-Brookes, Atlassian's Co-Founder, CEO, Director, and 10% Owner, disposed of 7,665 shares of Class A Common Stock on August 15, 2025.
• The total value of the shares sold was approximately $1,280,227.18.
• The transactions were executed at weighted-average prices ranging from $162.695 to $168.5997 per share.
• These sales were conducted pursuant to a Rule 10b5-1 trading plan adopted by Michael Cannon-Brookes on February 20, 2025.
• Following these transactions, Michael Cannon-Brookes indirectly beneficially owns 237,615 shares of Class A Common Stock, held by CBC Co Pty Limited as trustee for the Cannon-Brookes Head Trust.

Sentiment

Score: 5

Explanation: The insider sale was conducted under a pre-arranged 10b5-1 trading plan, which typically mitigates negative sentiment associated with insider selling as it is not a discretionary sale based on new information. The volume is also relatively small compared to the insider's total holdings.

Positives

• The sale was executed under a pre-arranged Rule 10b5-1 trading plan, indicating a scheduled liquidity event rather than a discretionary sale based on new, potentially negative, material non-public information.

Negatives

• Insider selling, even when pre-planned, reduces the direct ownership stake of a key executive and significant shareholder, which can sometimes be perceived as a neutral to slightly negative signal by the market.

Risks

• The weighted-average prices reported indicate that the transactions were executed in multiple trades during the day, subject to market price fluctuations within the specified ranges.

Related Party Transactions

• The sale of shares by Michael Cannon-Brookes, a Director, Officer, and 10% Owner, constitutes a related party transaction.

Stakeholder Impact

• Shareholders may note the reduction in direct insider ownership, but the pre-planned nature of the sale under a 10b5-1 plan generally minimizes concerns about its implications for the company's immediate prospects.

Key Dates

Recommendation

The insider sale by Michael Cannon-Brookes, a co-founder and key executive, was executed under a pre-arranged 10b5-1 trading plan. This indicates a planned liquidity event rather than a reaction to adverse company-specific news. While insider selling can sometimes be a bearish signal, the pre-planned nature and the relatively small volume compared to his overall holdings and the company's market capitalization suggest a neutral impact on the investment thesis. Investors should continue to evaluate Atlassian based on its core business performance and broader market conditions.

Keywords

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