NTB · CIK 0001653242
What Bank of N.T. Butterfield & Son Ltd told the SEC could break it.
Butterfield's disclosures converge on its concentration in a few small offshore markets. Its banking operations are heavily geographic — Bermuda, the Cayman Islands and the Channel Islands/UK together produced about 92% of fiscal 2025 net revenue (Bermuda alone 43%) — and its lending is concentrated by product too, with residential mortgages making up 70.6% of the Group's loan book. Those two concentrations land on the same islands that sit in the hurricane belt: severe weather, earthquakes and rising sea levels threaten both its operations and the property collateral behind that mortgage-heavy book. It also flags a narrower channel, noting US import tariffs are expected to pass through to Cayman inflation, estimated at 1.9% for year-end 2025.
4 self-disclosed vulnerabilities, pulled from its own filings, each in the company’s words, with the source. This is the risk register almost nobody reads.
In its own words
What could break it.
Other disclosures
- residential mortgages — 70.6% of the loan bookhigh
Single-product credit concentration: residential mortgage portfolios were 70.6% of the Group's loan book at end-2025, concentrated in the same small island markets the bank operates in.
“Accordingly, there is no dependence or concentration on a single product in these markets outside of the residential mortgage portfolios, which comprised 70.6% of the Group's loan book as at December 31, 2025”
SEC filing →As of 2026
Climate & physical
- hurricanes / rising sea levels — Bermuda & Caymanmedium
Key markets (Bermuda, Cayman) sit in the hurricane belt; severe weather, earthquakes, and rising sea levels threaten operations and the collateral behind a loan book that is ~70% island residential mortgages.
“The key markets in which we operate including Bermuda and the Cayman Islands, as well as our and our customers' business, operations and financial conditions, are subject to the risks associated with severe weather conditions (including among others tropical storms, hurricanes, floods and tornadoes), earthquakes, rising sea levels and other natural disasters”
SEC filing →As of 2026
Geographic concentration
- Bermuda + Cayman + Channel Islands/UK — 92% of net revenuemedium
Banking operations are concentrated in three small offshore markets: Bermuda (43% of FY2025 net revenue), Cayman (31%), and Channel Islands/UK (18%) — more exposed to a downturn in these islands than diversified competitors.
“Our banking operations are concentrated in Bermuda, the Cayman Islands and the Channel Islands and the UK, and we serve customers in these markets.”
SEC filing →As of 2026
Regulatory & policy
- US import tariffs — Cayman inflation pass-throughlow
Cayman depends on US imports, so recent US tariff increases pass through to local inflation (estimated 1.9% year-end 2025) — a tariff-to-island-economy channel affecting the bank's market.
“Given the Cayman Island's dependence on the US for imports, it is expected that the recent increases in US import tariffs will have a pass through effect on local inflation, resulting in estimated year-end inflation of 1.9% in 2025.”
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