L.B. Foster Co

FSTRNASDAQ · USD
39.75USD+0.68 (+1.74%)
859

L.B. Foster Co (FSTR) Historical Volatility

FSTR's 30 day historical volatility is 49.12%, in the 88th percentile of readings over the past year. This is a high percentile, meaning L.B. Foster Co shares have swung far more than usual. FSTR's 30 day implied volatility sits at 45.55%, with an IV Rank of 9.92%, leaving IV 3.57 points below historical volatility. This means options are pricing in less movement than the stock has actually delivered, as of Nov 5, 2026.

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Tracking FSTR historical volatility helps you see how much L.B. Foster Co's stock price has actually moved, giving you a baseline for whether option premiums look fair, cheap, or expensive. While implied volatility shows what the market expects, FSTR's HV, also known as realized volatility, shows what actually happened. Use our scanner to monitor FSTR 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 a stock's past returns, typically measured over rolling windows like 10, 20, 30, or 60 days. FSTR's 30 day historical volatility, or FSTR HV, is one of the most widely watched readings because it balances responsiveness with stability. Comparing FSTR's HV to its implied volatility reveals the volatility risk premium. When IV sits well above HV, options are pricing in more movement than the stock has actually delivered, giving option sellers an edge. When HV runs hot relative to IV, options are pricing in less movement than the stock has delivered, and buyers may be underpaying for it.

L.B. Foster Company provides engineered and manufactured products and services for the building and infrastructure projects worldwide. The company's Rail, Technologies, and Services segment offers new rail to passenger and short line freight railroads, industrial companies, and rail contractors; used rails; rail accessories, including track spikes and anchors, bolts, angle bars, tie plates, and other products; power rail, direct fixation fasteners, coverboards, and special accessories; and trackwork products, as well as engineers and manufactures insulated rail joints and related accessories. This segment also provides friction management products and application systems, railroad condition monitoring systems and equipment, wheel impact load detection systems, wayside data collection and management systems, track fasteners, and engineered concrete railroad ties; and aftermarket services.

Historical Volatility

HV Percentile
88thHV Percentile
High

Historical movement is elevated versus the past year. The stock has been unusually active.

Historical Volatility (30d)49.12%

HV Percentile88th

Implied Volatility (30d)45.55%

IV Rank9.92%

IV Minus HV-3.57%

As of Nov 5, 2026

IV vs HV
Implied Volatility (IV) vs Historical Volatility (HV) over the past month.

As of Nov 5, 2026

IV - HV Difference
Difference between IV and HV over time. Positive values indicate IV > HV.

As of Nov 5, 2026

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