Atlassian Corporation PLC's stock experienced a 5.01% decline in after-hours trading, reversing recent positive momentum. The sharp drop followed a multi-day rally that had lifted the company's share price from mid-April levels.

The plunge appears to be primarily driven by a major analyst action from Bank of America Securities, which significantly lowered its price target on Atlassian to $84 from $150 while maintaining a Buy rating. This represents a dramatic 44% reduction in the valuation expectation from the financial institution, which triggered panic selling and profit-taking among investors.

The negative reaction to the revised target overshadowed positive developments announced earlier, including an expanded partnership with Google Cloud to integrate Atlassian's Rovo AI platform with Google's Gemini models and Google Workspace. The after-hours movement suggests the market is focusing on the substantial downward revision in valuation expectations despite the maintained Buy rating.