Zscaler and Fastly Shares Slump on Executive Exit and AI ROI Concerns

Key Facts

1Zscaler shares fell 9% following the announcement of the Chief Revenue Officer's departure.

2Fastly shares dropped 6% as Citigroup questioned the financial payoff of AI-related traffic.

Zscaler shares fell 9% following the announcement of the Chief Revenue Officer's departure, according to 247wallst.com. The company stated that Ross Tackett, the worldwide head of sales, will succeed the outgoing executive effective October 1, raising concerns regarding sales execution at the cybersecurity provider.

Fastly shares dropped 6% as Citigroup questioned the financial payoff of AI-related traffic under the company's billing model. ZS closed at $214.64, while FSLY closed at $26.68 on September 24, 2026. Separately, Citigroup (C) closed at $132.1 on the same date.