During the dot-com bubble, investors who sold at the first sign of a wobble missed massive gains. Analysis shows that even after the crash, buy-and-hold investors were profitable, while those who sold early were not. The worst financial outcome is panic-selling at the bottom of a crash, which locks in losses.

Since it's impossible to know upfront which investments will generate outlier returns, the key isn't picking them but holding them. The biggest mistake is 'cutting your flowers to water your weeds'—selling winners to invest in underperformers. You must 'circle the wagons' around your core assets.

Investors often focus on losses, but the biggest financial mistakes come from selling compounding winners like Costco too early. This happens when short-term IRR calculations, heavily dependent on unpredictable exit multiples, overshadow the long-term value of a great business.

Despite their success, both Dan Loeb and David Sacks confess to the vexing problem of selling winning stocks too early after an IPO. Sacks cites selling Palantir in its twenties as a "huge mistake," highlighting a universal psychological trap for even the most elite investors.

Even sophisticated institutional investors exhibit significant behavioral biases. Research on their trades revealed that while their buying decisions added value, their selling decisions were so poor that a random selling strategy would have outperformed their actual sales by 100-200 basis points. They seem to apply discipline to buying but not selling.

Shelby Davis Jr.'s fund was a top performer in its first year, leading to overconfidence. This early success, often a product of market whims rather than superior process, caused him to misattribute luck to skill, resulting in poor performance in subsequent years.

Investors fixate on selecting the right companies, but the real money is made or lost in the decision of when to sell or hold a winning position. The timing of an exit can create a 100x difference in outcomes. Having a disciplined approach to portfolio management and liquidity is more critical to fund performance than the initial investment choice.

Wilson advised against trying to perfectly time the peak of a successful company's dominance. Competition will eventually emerge, but anticipating its impact is futile and often leads to premature selling. He believed you can make a fortune by riding a winner for years before the problems become acute.

An investor attributes missing Uber, Pinterest, and DoorDash to his fund's structure. With only 10-15 investments per fund and a "responsible investing" mandate, each decision is heavily weighted, leading to a slower, more cautious approach that is ill-suited for capturing power-law returns.