Which 1998 hedge fund collapse prompted a Federal Reserve-brokered rescue to limit market contagion?

The 1998 hedge fund collapse that prompted a Federal Reserve-brokered rescue was Long-Term Capital Management.

Long-Term Capital Management, or LTCM, was a highly leveraged hedge fund founded in 1994. Its partners included prominent academics and financial experts, including Nobel Prize-winning economists. The fund used mathematical models and large positions in relative-value trades, expecting price relationships to converge.

During the 1998 Russian financial crisis, markets moved in ways that LTCM’s models had not adequately anticipated. Losses mounted, leverage magnified the damage, and counterparties feared that a disorderly failure could destabilize already fragile markets. The Federal Reserve Bank of New York helped organize a private-sector rescue in September 1998.

The Federal Reserve did not provide the bailout money itself. Fourteen banks and investment firms supplied $3.6 billion in exchange for control of the fund. The episode became a famous warning about leverage, interconnected counterparties, and risks outside traditional banks.