How Algorithms Turn Panic into Profit

31 Dec 2025 · 1 min

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Peter Lynch grew Fidelity's Magellan Fund from $18 million to $14 billion with 29% annual returns, yet most retail investors in the fund lost money by chasing performance and selling during downturns. Kosta Ouzas argues the fix is writing your trading rules before you trade, so emotion doesn't wreck your decisions.

Questions this video answers

From 1977 to around 1990.

From $18 million to around $14 billion.

Around 29% over 13 years.

Chapters

Look, take Peter Lynch. He's one of the most successful investors of all time. He managed the Magellan Fund at Fidelity from 1977 to around 1990, turning it from 18 million into around $14 billion. Now, over those 13 years, he delivered, on average, a return of around 29%. Nearly double the S&P 500. So by all measures, it was one of the greatest runs in financial history. But here's the shocking part. Most of his investors, they actually lost money. Now, you've got to ask yourself why? How could that possibly happen? Well, it's because they bough when the fund was hot and then they sold when it dipped. So basically, let emotion, not strategy, drive their actions. What they did is they chased performance and then they bailed out on fear. And that's the exact opposite of what works. So what you can do is start by writing down your trading rules before you enter any trade. That's a great start. And then just follow them, no matter what the market does. That's actually how discipline is built. You need a plan that exists outside your emotions.