# Zscaler just had its worst day ever, down 31% — short the bounce as the sell-off continues

_AI-generated trading idea · SHORT · ZS_

> Canonical page: https://commonquant.ai/research/for-you/zscaler-just-had-its-worst-day-ever-down-31-short-the-bounce--c0e23b7c-710b-4ae2-96b9-3b385b54ccd9

Cybersecurity company Zscaler lost nearly a third of its value today — its worst day ever — after issuing cautious forward guidance and shaking up its sales leadership. The stock has now lost more than half its value over the past year.

## Idea

A 31% single-day crash is extreme, and the fundamental reasons behind it — cautious guidance and a sales leadership shake-up — suggest the business is deteriorating, not just having a bad quarter. Zscaler has already been cut in half over the past year, so the longer-term trend was already pointing down. After a crash this big, the stock often bounces for a day or two as bargain hunters step in, but those bounces tend to fade quickly when the underlying story hasn't changed. Shorting into that bounce, with a tight stop, captures the likely next leg lower. The broader market is also grappling with a Fed governor warning she's ready to raise rates if inflation sticks around, which adds pressure to high-priced growth names.

## Key details

- Symbols: ZS
- Timeframes: daily
- Tags: \#earnings, \#cybersecurity, \#short

## Community

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## News sources

- [Earnings live updates: Zscaler stock plunges 31% on cautious guidance](https://finance.yahoo.com/markets/live/earnings-live-updates-zscaler-stock-plunges-31-on-cautious-guidance-115127526.html) — Yahoo Finance
- [Zscaler tanks 31% for worst day ever on 'prudent' guidance, sales shakeup](https://www.cnbc.com/2026/05/27/zscaler-zs-earnings-q3-2026.html) — CNBC

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