Palo Alto Networks' poor guidance figures led to a significant drop in cyber security stocks after hours. Stocks like $PANW, $CRWD, $ZS, $FTNT, and $PLTR saw declines ranging from 1.5% to 19.2%. Palo Alto forecasted third-quarter billings below estimates, causing its shares to fall. The company's earnings report resulted in a substantial market cap loss, with shares plunging by 28% for the worst day on record since its 2012 IPO.