# Zscaler drops 31% in a single day — wait for a green candle, then buy the bounce

_AI-generated trading idea · LONG · ZS_

> Canonical page: https://commonquant.ai/research/for-you/zscaler-drops-31-in-a-single-day-wait-for-a-green-candle-the--17082467-9d71-4eb7-8346-40ff1e1186d6

Cybersecurity company Zscaler just had its worst trading day ever, losing 31% in a single session after reporting cautious future guidance and shaking up its sales leadership. The stock has now lost half its value over the past year.

## Idea

A 31% single-day crash is an emotional overreaction more often than not. Zscaler's business didn't evaporate overnight — the sell-off was triggered by cautious forward guidance and a sales reorganization, not a fundamental breakdown. Historical patterns show that extreme one-day drops of 25%+ in large-cap tech frequently see a snap-back rally within a week as value hunters and short-sellers taking profits create buying pressure. The key is to wait for the first sign of stabilization — one green candle — before stepping in, and to keep the trade small and short-duration since the downtrend could resume.

## Key details

- Symbols: ZS
- Timeframes: 1D
- Tags: \#oversold, \#earnings, \#mean\_reversion, \#tech

## 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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