Phathom Pharmaceuticals Inc
Phathom Pharmaceuticals Inc (PHAT) Historical Volatility
PHAT 30-day historical volatility is 68%. This ranks in the 65th percentile of readings over the past year.
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Tracking PHAT historical volatility helps you see how much Phathom Pharmaceuticals Inc's stock price has actually moved over past periods, giving you a baseline to judge whether current option premiums are fair, cheap, or expensive. While implied volatility tells you what the market expects, Phathom Pharmaceuticals Inc's HV tells you what really happened. Use our scanner to monitor PHAT 30 day historical volatility alongside longer lookback windows and spot the moments when realized and implied diverge.
Historical volatility is the annualized standard deviation of an underlying's past returns, typically measured over rolling windows like 10, 20, 30, or 60 days. The PHAT 30 day historical volatility is one of the most widely watched readings because it balances responsiveness with stability. Comparing Phathom Pharmaceuticals Inc's HV to its implied volatility reveals the volatility risk premium — when IV sits well above HV, option sellers tend to have an edge; when HV runs hot relative to IV, buyers may be underpaying for movement.
Phathom Pharmaceuticals, Inc., a clinical-stage biopharmaceutical company, focuses on developing and commercializing treatments for gastrointestinal diseases. The company has the rights in the United States, Europe, and Canada to vonoprazan, a potassium-competitive acid blocker (P-CAB) that blocks acid secretion in the stomach. It is also developing vonoprazan, which is in Phase III clinical trials for the treatment of erosive gastroesophageal reflux disease; and in combination with antibiotics for the treatment of Helicobacter pylori infection. Phathom Pharmaceuticals, Inc. was incorporated in 2018 and is headquartered in Florham Park, New Jersey.
Sizing a long premium trade, modeling a covered call, or hunting volatility arbitrage all come back to one question: how much has the stock actually moved? Our scanner puts Phathom Pharmaceuticals Inc's historical volatility side-by-side with implied readings across every lookback window, so you can see exactly where PHAT HV is running hot, cold, or in line. Make the PHAT 30 day historical volatility — and every other window — work for your edge instead of against it.
As of September 23, 2026
As of September 23, 2026
See how volatility has moved over time
Track PHAT historical volatility, spot where IV and realized volatility diverge, and find options that are priced in your favor right now.
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