NB Bancorp Inc
NB Bancorp Inc (NBBK) Historical Volatility
NBBK 30-day historical volatility is 18%. This ranks in the 6th percentile of readings over the past year.
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Tracking NBBK historical volatility helps you see how much NB Bancorp 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, NB Bancorp Inc's HV tells you what really happened. Use our scanner to monitor NBBK 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 NBBK 30 day historical volatility is one of the most widely watched readings because it balances responsiveness with stability. Comparing NB Bancorp 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.
NB Bancorp, Inc. focuses on operating as a bank holding company for Needham Bank that provides various banking products and services in Greater Boston metropolitan area and surrounding communities in Massachusetts, eastern Connecticut, southern New Hampshire, and Rhode Island. The company offers various deposits, including certificate of deposit, individual retirement, money market, savings, NOW, demand deposit, and interest-bearing and noninterest-bearing checking accounts; and commercial real estate and multifamily, one- to four-family residential real estate, construction and land development, commercial and industrial, and consumer loans, as well as home equity loans and lines of credit.
It also invests in securities consisting of U.S. treasury and federal agency securities, government-sponsored residential mortgage-backed securities, municipal bonds, and corporate bonds. The company was founded in 1892 and is based in Needham, Massachusetts.
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 NB Bancorp Inc's historical volatility side-by-side with implied readings across every lookback window, so you can see exactly where NBBK HV is running hot, cold, or in line. Make the NBBK 30 day historical volatility — and every other window — work for your edge instead of against it.
As of September 24, 2026
As of September 24, 2026
See how volatility has moved over time
Track NBBK historical volatility, spot where IV and realized volatility diverge, and find options that are priced in your favor right now.
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