Palo Alto Networks (PANW) reported mixed fiscal first quarter results, sparking a stock sell-off. The cybersecurity giant reported adjusted earnings per share of $1.56, surpassing analyst expectations of $1.48, while revenue of $2.1 billion fell slightly short of Wall Street's $2.12 billion estimate.

This comes ahead of Palo Alto's planned two-for-one forward stock split, set to take effect on December 12th.

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