Privat Capital holds a concentrated portfolio of 16-17 stocks. This strategy forces deep conviction in each position and ensures that winners have a meaningful impact on fund performance. Over-diversification can dilute both research focus and the potential returns from a fund's best ideas.

Analysis of Keynes's portfolio reveals a subtle skill: his true value-add came from ensuring his lowest-conviction ideas received minimal capital. Over his career, his bottom five positions shrank from 11.7% to just 6% of his portfolio, demonstrating a disciplined approach to managing risk on less-certain bets.

Many investors wrongly equate high conviction with making a large initial investment. A more evolved approach is to start with smaller at-cost positions, allowing a company's performance to earn its eventual large weighting in the portfolio. This mitigates risk and improves decision-making.

Even with big wins, a venture portfolio can fail if not constructed properly. The relative size of your investments is often more critical than picking individual winners, as correctly sized successful investments must be large enough to overcome the inevitable losers in the portfolio.

Instead of using an arbitrary percentage, Gorham Thomason of AKO Capital determines maximum position size based on a stock's liquidity. This ensures the fund can exit a large position without crashing the share price if the investment thesis sours, providing a practical risk management framework.

Mohnish Pabrai argues against trimming winners. He believes that over decades, a truly skilled fund manager should let their best idea run until it dominates the portfolio, potentially reaching 95% concentration. Selling a rare, generational compounder just to rebalance is a critical mistake he calls "desecration of the temple."

Allocate more capital to businesses with a highly predictable future (a narrow "cone of uncertainty"), like Costco. Less predictable, high-upside bets should be smaller positions, as their future has a wider range of possible outcomes. Conviction and certainty should drive allocation size.

To pursue massive upside, one must first survive. Gardner mitigates risk by never allocating more than 5% of his portfolio to any new position. This discipline prevents catastrophic losses from a single bad idea, ensuring he stays in the game long enough for the big winners to emerge.

A powerful risk management technique is setting a maximum percentage of your portfolio that can be invested in a single stock *at cost*. A 5% at-cost limit means once you've invested 5% of your capital, you cannot add more, even if the stock price plummets and its market value shrinks. This prevents chasing losers.