Long Term Capital Management (LTCM) was a hedge fund founded in 1994 by John Meriwether that utilized quantitative models and leverage to profit from convergence trades. While initially successful, LTCM lost billions in 1998 during the Russian financial crisis as markets became volatile and liquidity dried up. To prevent systemic risk, the Federal Reserve orchestrated an emergency bailout. The crisis showed that highly leveraged positions are vulnerable to shifts in market liquidity and correlations between assets. Key lessons include incorporating liquidity as a risk factor, stress testing models, and relying more on judgment than purely quantitative analysis.