Zscaler Stock (ZS) Plunges on Weak Guidance After Q3 Earnings

Zscaler reported Q3 fiscal 2026 results after the close on May 26, 2026, showing revenue of $850.5 million, up 25% year-over-year, and Annual Recurring Revenue (ARR) growing 25% to $3.525 billion. Despite beating expectations on top-line growth, the stock dropped approximately 16% in after-hours trading, closing the extended session near $154 after finishing the regular session at $184.60. The market's reaction was not driven by the quarter itself but by the guidance attached to it.

The core concern: Zscaler lowered its free cash flow margin target to approximately 22.8% to 23.3% for the full year, down sharply from prior guidance of 26.5% to 27%, citing higher capital expenditures running in the high single digits as a percentage of revenue. For a cybersecurity company whose premium valuation has historically been justified by high free cash flow conversion, a margin cut of this magnitude is significant. Zscaler did raise its revenue and adjusted earnings guidance for FY2026, now targeting revenue of approximately $3.33 billion (growth of roughly 24.6%), which suggests the demand environment remains healthy. The conflicting signals created a classic "good quarter, bad guide" pattern that weighed on the stock.

The longer-term read is nuanced. Elevated capex may reflect genuine investment in the infrastructure required to serve a growing zero-trust security customer base, which could position Zscaler for stronger cash generation in subsequent fiscal years. However, investors who paid a premium multiple for high free cash flow should reassess near-term models. Key items to watch include whether the sales force disruption mentioned in prior quarters has been resolved, whether ARR growth can sustain the 24% to 25% range into FY2027, and how management addresses cash flow margin recovery on the next earnings call in August.