Form 4: Atlassian Co-CEO Sells $1.33M in Stock Under 10b5-1 Plan

Atlassian Co-CEO Michael Cannon-Brookes sold 7,665 shares of Class A Common Stock for approximately $1.33 million under 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 September 16, 2025, at weighted-average prices ranging from $171.9541 to $175.5248 per share.
• The total proceeds from these sales amounted to approximately $1,329,828.72.
• These transactions were executed pursuant to a Rule 10b5-1 trading plan, which was adopted by Mr. Cannon-Brookes on February 20, 2025.
• Following these transactions, Mr. Cannon-Brookes beneficially owns 76,650 shares of Class A Common Stock indirectly through a trust.

Sentiment

Score: 4

Explanation: The sale by a co-CEO and significant owner, even under a 10b5-1 plan, can be viewed with slight caution by the market. While not inherently negative due to the pre-planned nature, it doesn't signal increased confidence or investment in the company by a key insider.

Negatives

• Insider selling by a key executive and significant owner, even under a 10b5-1 plan, can be perceived with slight caution by the market, potentially signaling a desire for diversification or liquidity rather than increased confidence.

Future Outlook

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

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

Insider sales, even when pre-arranged through a 10b5-1 plan, are routinely monitored by investors as they can sometimes influence market sentiment. While 10b5-1 plans are designed to allow insiders to sell shares without being accused of trading on material non-public information, significant sales by key executives are still scrutinized within the broader tech industry context, where executive confidence is often a factor in investor perception.

Related Party Transactions

• Shares are held indirectly by CBC Co Pty Limited as trustee for the Cannon-Brookes Head Trust, indicating a related party holding structure for the beneficial ownership.

Stakeholder Impact

• Shareholders may interpret the insider sale as a signal, potentially influencing their perception of the company's near-term prospects or the executive's long-term commitment, despite the 10b5-1 plan.

Key Dates

Recommendation

While the insider sale by Co-CEO Michael Cannon-Brookes is significant in value, it was conducted under a pre-arranged 10b5-1 trading plan, which mitigates the immediate negative signal often associated with open-market insider selling. The plan's adoption date of February 20, 2025, indicates the decision to sell was made well in advance of the transaction date. This suggests a planned diversification or liquidity event rather than a reaction to recent material non-public information. Therefore, without additional information or changes in company fundamentals, a 'hold' recommendation is appropriate, as this transaction alone does not fundamentally alter the investment thesis for Atlassian, but it also doesn't provide a strong positive catalyst.

Keywords

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