What the company or idea is
Signature Bank was a New York–based commercial bank founded in 2001, closed by state banking officials on March 12, 2023.
How it actually makes money
Signature Bank earned revenue primarily from net interest income — the spread between what it paid on deposits and what it charged on loans — with a heavy concentration in commercial real estate and private client banking.
What works
Its private client model attracted high-net-worth depositors and corporate clients, particularly in real estate and professional services — but this success deepened its vulnerability to confidence shocks.
What does not
Its risk control framework did not scale with growth. Its liquidity score was downgraded in 2019. It failed to produce consistent, timely data to regulators during the crisis.
What to take from it
Growth without embedded controls is not scalable — especially when 89.3% of deposits are uninsured and regulators have already flagged liquidity weaknesses.
Is it worth your time
Yes. Its collapse exposes how regulatory tolerance for informal governance and delayed data disclosure can accelerate failure when uninsured deposit concentration meets contagion.
