NBBK vs NBTB: Correlation
Measured on weekly returns over the past three years, NB Bancorp, Inc. (NBBK) and NBT Bancorp Inc. (NBTB) carry a correlation of 0.76, a strong link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are NBBK and NBTB?
On 3 years of weekly data the NBBK/NBTB correlation comes out at 0.76, strong. Little has changed lately, as the 1-year reading of 0.76 lands near the 3-year figure. The 5-year figure is n/a, and annualized covariance runs at 554.1 %².
In NBBK's tracked universe of 17 assets, NBTB sits right near the top at #3. Neither side won the trailing year by much: +19.3% against +18.1%.
How is this computed?
Pearson correlation on weekly returns: ρ(A,B) = cov(rA, rB) / (σA · σB), over windows of 52, 156 and 260 weeks. Covariance is annualized (×52) and expressed in %². Full definitions on the methodology page.
NBBK vs NBTB: side by side
| NBBK (NB Bancorp, Inc.) | NBTB (NBT Bancorp Inc.) | |
|---|---|---|
| 1-year return | +19.3% | +18.1% |
| 5-year return | n/a | +68.0% |
| Volatility (ann.) | 27.6% | 27.2% |
| Beta vs S&P 500 | 0.84 | 0.75 |
| Max drawdown (3Y) | -24.7% | -25.7% |
| Market cap | $1.0B | $2.7B |
| P/E (trailing) | 14.7 | 12.5 |
| Dividend yield | 4.39% | 2.87% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | NBBK | NBTB |
|---|---|---|
| 2022 | – | +16.0% |
| 2023 | – | -0.1% |
| 2024 | +34.3% | +17.7% |
| 2025 | +10.6% | -10.2% |
| 2026 | +13.9% | +26.0% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are NBBK and NBTB good diversifiers for each other?
Somewhat, no more. With 0.76 correlation, most large moves hit both names, and the diversification benefit stays modest.
FAQ
What is the correlation between NBBK and NBTB?
The NBBK/NBTB correlation stands at 0.76 on a 3-year window (1 year: 0.76, 5 years: n/a), computed from weekly returns as of 2026-08-27.
Is NBTB a good diversifier for NBBK?
Somewhat, no more. With 0.76 correlation, most large moves hit both names, and the diversification benefit stays modest.
What does a correlation of 0.76 mean?
On the −1 to +1 scale, 0.76 describes how much the two returns move together: +1 is lockstep, 0 is independence, negative values mean opposite directions. It says nothing about which performed better.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/nbbk-vs-nbtb.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/nbbk-vs-nbtb/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: NBBK correlations · NBTB correlations
