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

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

Summary

• Michael Cannon-Brookes, Co-Founder and CEO of Atlassian Corp, disposed of a total of 7,665 shares of Class A Common Stock on September 8, 2025.
• The sales were executed in three separate transactions at weighted-average prices of $170.386, $171.2306, and $172.16.
• These transactions were conducted pursuant to a Rule 10b5-1 trading plan adopted on February 20, 2025.
• Following these transactions, Mr. Cannon-Brookes indirectly beneficially owns 122,640 shares of Class A Common Stock through CBC Co Pty Limited as trustee for the Cannon-Brookes Head Trust.

Sentiment

Score: 6

Explanation: The sale of shares by a key insider is generally viewed with caution, but the execution under a pre-arranged Rule 10b5-1 trading plan mitigates concerns about opportunistic selling based on new, non-public information. This suggests a planned liquidity event rather than a change in fundamental outlook, leading to a neutral to slightly positive sentiment due to good governance.

Positives

• The transactions were executed under a Rule 10b5-1 trading plan, which demonstrates pre-planning and adherence to insider trading regulations, mitigating concerns about opportunistic selling.

Negatives

• A significant insider sale by a co-founder and CEO, even if pre-planned, could be perceived by some investors as a slight reduction in direct personal stake in the company's future performance.

Risks

• No specific risks are detailed in this Form 4 filing beyond the general market perception of insider selling.

Future Outlook

No forward-looking statements or guidance are provided in this insider transaction report.

Industry Context

This filing reports an individual insider transaction and does not provide broader industry context or trends.

Corporate Governance

Related Party Transactions

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

Stakeholder Impact

• Shareholders: The sale represents a minor reduction in direct insider ownership, but the pre-planned nature under a 10b5-1 plan suggests no immediate negative implications for company performance.
• Employees: No direct impact on employees is indicated by this filing.

Next Steps

• The Reporting Person will continue to file Form 4s for any future changes in beneficial ownership of Atlassian securities.

Key Dates

Recommendation

The sale by a co-founder and CEO, while notable, was conducted under a pre-arranged 10b5-1 trading plan, indicating it was not based on new material non-public information. This type of transaction is common for diversification or liquidity purposes and does not typically signal a change in the company's fundamental outlook or warrant a change in investment recommendation.

Keywords

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