Glossary term
AMERIBOR
AMERIBOR was a credit-sensitive benchmark interest rate based on unsecured borrowing by U.S. banks, designed as a LIBOR alternative.
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What Is AMERIBOR?
AMERIBOR was a credit-sensitive benchmark interest rate based on unsecured borrowing by U.S. banks, particularly smaller and regional banks. It was developed by the American Financial Exchange as an alternative reference rate during the transition away from U.S. dollar LIBOR.
The past tense matters. In 2025, ICE Benchmark Administration announced that it would cease publication of ICE AMERIBOR settings after June 30, 2025, subject to remaining consultation steps. For legacy documents, the term may still appear in loans, swaps, or rate fallback language.
Key Takeaways
- AMERIBOR was a credit-sensitive interest-rate benchmark.
- It was designed to reflect unsecured bank funding costs.
- It was discussed as a LIBOR alternative, especially for institutions wanting a bank-credit component.
- ICE announced cessation of ICE AMERIBOR settings after June 30, 2025.
- Contracts referencing AMERIBOR should be reviewed for fallback language and replacement-rate mechanics.
How AMERIBOR Worked
AMERIBOR was intended to reflect actual unsecured funding transactions among participating banks and financial institutions. That made it different from risk-free rates such as SOFR, which is based on overnight Treasury repo transactions.
The appeal was credit sensitivity. Some banks wanted a reference rate that moved more closely with bank funding costs rather than a nearly risk-free secured overnight rate. That feature could be useful in loan pricing but also introduced benchmark complexity.
AMERIBOR Versus SOFR
Benchmark | Basic design | Credit sensitivity |
|---|---|---|
AMERIBOR | Unsecured bank funding benchmark | Credit-sensitive |
SOFR | Secured overnight Treasury repo rate | Nearly risk-free rate |
The difference matters for loans and derivatives. A credit-sensitive rate can rise when bank funding stress rises. A risk-free rate may need a spread adjustment to approximate the economics of older LIBOR-based contracts.
Contract and Fallback Risk
When a benchmark stops being published, contracts need a way to determine the replacement rate. Well-drafted agreements include fallback provisions that identify a successor rate, adjustment spread, and calculation agent. Poorly drafted agreements can create disputes or economic surprises.
Anyone reviewing a loan, swap, or floating-rate instrument that references AMERIBOR should identify the fallback language, amendment rights, notice requirements, and effective replacement date.
What to Watch
Benchmark transitions are not just operational changes. They can affect interest expense, yield, hedge effectiveness, valuation, and borrower-lender economics. A small spread difference can matter over a large loan balance or long maturity.
Because the AMERIBOR publication status changed, current documents should be read with up-to-date benchmark notices and contract language rather than older marketing material.
The Bottom Line
AMERIBOR was a credit-sensitive U.S. bank funding benchmark associated with the post-LIBOR transition. Its cessation means the financially important issue is now legacy exposure: which contracts still reference it, and what replacement-rate provisions apply.