To avoid emotional, performance-chasing mistakes, write down your selling criteria in advance and intentionally exclude recent performance from the list. This forces a focus on more rational reasons, such as a broken investment thesis, manager changes, excessive fees, or shifting personal goals, thereby preventing reactionary decisions based on market noise.

The exit point for a trade shouldn't be a price target but the moment of 'information parity'—when your unique insight is widely known. This discipline requires selling once your informational advantage is gone, whether you've made or lost money, to avoid trading on factors outside your original thesis.

A study in the book "Art of Execution" found the world's best investors have a win rate equivalent to a coin flip on their top 10 ideas. This proves superior returns come from how positions are managed after the initial buy decision, not from superior stock picking alone.

Professional fund managers are often constrained by the need to hug their benchmark index to avoid short-term underperformance and retain clients. Individuals, free from this 'career risk,' can make truly long-term, contrarian bets, which is a significant structural advantage for outperformance.

Gaonkar admits a major mistake wasn't just selling NVIDIA too early, but failing to re-evaluate it later. The sunk cost bias makes it psychologically difficult to revisit past decisions, especially ones that were wrong, causing investors to miss out on significant future gains.

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.

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.

Suboptimal selling is often driven by fear: a position gets "too big" or you want to lock in gains. A better approach is to only sell when you find a new investment you "love" more. This forces a positive, opportunity-cost framework rather than a negative, fear-based one, letting winners run.

A University of Chicago study revealed that while hedge fund managers' buy decisions are rational, their sell decisions are emotional and destroy value. In fact, randomly selling a different stock in their portfolio would have outperformed their actual sell decisions by 150-200 basis points.