F5 shares fell 19.28% to $367.27 in intraday trading on October 28, 2026, while the S&P 500 gained 0.2%. The decline came a day after the application software and security company reported its fiscal fourth-quarter results.

Key Takeaways

  • The stock fell as the broader S&P 500 edged higher.
  • F5 reported quarterly revenue growth of 13% and issued fiscal 2027 guidance.

F5 shares diverge from the market

The drop in Nasdaq-listed F5 contrasted with the broader market’s advance during the session. Investors were also awaiting a Federal Reserve interest-rate decision and earnings from Alphabet and Microsoft.

The available information does not establish what caused F5’s share-price decline.

Results and outlook preceded the decline

In its fiscal fourth-quarter earnings release on October 27, F5 reported revenue of $917 million for the quarter ended September 30, up from $810 million a year earlier. GAAP net income was $186 million, compared with $190 million in the prior-year quarter.

F5 forecast fiscal 2027 revenue growth of 8% to 9% and non-GAAP earnings of $18.00 to $18.30 per share. Those figures are company guidance, not reported results.

The board also authorized an additional $1.5 billion for share repurchases, on top of $322 million remaining under the existing program. The authorization does not mean the shares have already been bought.

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