Lehman Brothers

A firm that outlived the Great Depression, two world wars, and a century of panics finally met a crisis it could not survive. Through the mid-2000s, Lehman Brothers piled into mortgage-backed securities and commercial real estate with leverage ratios that ran sky-high, borrowing heavily to amplify every return. When the housing market cracked in 2007, the exposure was enormous, and an obscure accounting maneuver kept the true scale quietly off the books. CEO Dick Fuld stayed certain the assets were worth more than buyers would pay.

For founders and operators, this is a study in how leverage and conviction interact under pressure, and how the gap between an uncomfortable position and a fatal one can close faster than anyone admits. It sharpens the decision of when to take a loss early versus defend your own numbers, and how to surface the risk you are least willing to say out loud before the market says it for you.