Which 1998 hedge fund collapse forced a Federal Reserve-coordinated rescue after the Russian financial crisis?

The 1998 hedge fund collapse that forced a Federal Reserve-coordinated rescue after the Russian financial crisis was Long-Term Capital Management.

Long-Term Capital Management, or LTCM, was a highly leveraged hedge fund founded in 1994. Its partners included prominent financiers and Nobel Prize-winning economists. The fund used mathematical models and large positions in bond and other markets, often expecting price relationships to converge.

Russia's August 1998 debt default and ruble devaluation disrupted those relationships and triggered a global flight to safer assets. LTCM suffered severe losses, and its enormous leverage raised fears that an uncontrolled failure could destabilize major banks and markets. In September 1998, the Federal Reserve Bank of New York helped organize a private-sector recapitalization by a consortium of financial institutions.

The Federal Reserve did not directly bail out LTCM with taxpayer funds. Instead, participating banks supplied the rescue capital and took control of the fund's portfolio. The episode became a major example of systemic risk created by leverage, interconnected counterparties, and crowded trading strategies.