The best quant funds on earth nearly got wiped out in August 2007 — not because their models were wrong. For years, a handful of the most sophisticated, longest-running quantitative equity funds in the world had compounded steadily. Then, in the first two weeks of August 2007, several had their worst week on record. Days later, most of them got most of it back. Academic research (Lo & Khandani, MIT) traces the trigger to a single rapid, forced unwind — likely a margin call or risk cut at one large fund — that pushed prices against everyone else quietly running similar factor bets. Once the first fund was forced to sell, other funds' own stop-losses and risk limits did the rest. No bad forecast. No broken model. Just too many players holding the same trade at the same time. The lesson that outlives 2007: the question isn't only "is my signal right." It's "what happens to my account if hundreds of others are holding the same position when it turns." Diversifying your *entry logic*, not just your instruments, is what keeps a bad week from becoming a blown account. It's a big part of why every trade CTrend FX Ultimate opens still runs through mandatory SL/TP, break-even, a trailing stop, and a hard drawdown cap — regardless of how confident the system is on entry. A crowded trade doesn't ask permission before it turns. 🔗 link in bio ⚠ Forex and CFD trading carries a high level of risk and may not be suitable for all investors. Past performance is no guarantee of future results. Not financial advice. #AlgorithmicTrading #RiskManagement