Key Takeaways

  • WashU grew its endowment from under $8 billion to nearly $20 billion over nine years, generating $17 billion in gains after Scott Wilson cut all 36 hedge funds.
  • SpaceX expanded to represent north of 20% of WashU's entire net asset value, and Wilson refused multiple opportunities to sell secondary shares.
  • Standard 10% fund concentration limits penalize top investors by forcing them to trim their best assets prematurely.
  • Wilson points to Charlie Munger's investing principles to show that portfolio diversification provides zero quantitative benefit beyond 30 underlying look-through holdings.
  • Wilson identifies his biggest career mistake as failing to add capital to early winners simply because they had already grown into large positions.

Concentration Beats the Safety of Diversification

Institutions love safety in numbers. They hire dozens of consultants, back hundreds of managers, and spread checks so thin that no single bankruptcy can ruin them. They also ensure no single victory can change their fortunes.

Scott Wilson took the opposite path at Washington University in St. Louis. When he took over the university's endowment, he eliminated all 36 external hedge funds. He moved capital out of diversified pools and placed it into direct company co-investments. His most aggressive bet was SpaceX. As the company expanded, Wilson refused to rebalance.

“At one point, north of 20% of the portfolio is in SpaceX,” (play from 0:09) Wilson said.

Most risk committees would have forced an immediate sale once a private holding passed 5% of total assets. Wilson and his team stood their ground against institutional pressure. As Wilson explained, “we had conviction as a team and we had many chances to take lots of liquidity in that name but we advocated for holding it and letting that compound.” (play from 11:01) That patience paid off. Over nine years, the endowment grew from under $8 billion to nearly $20 billion, generating $17 billion in net gains.

Ten Percent Concentration Limits Cap Your Upside

The venture capital industry runs on protective rules that sabotage peak performance. Limited partners routinely write covenants that stop fund managers from putting more than 10% or 15% of their committed capital into any single company. Wilson argues that these guardrails misunderstand power-law returns.

“To have a 10% concentration limit in any individual fund. I don't think it makes sense,” (play from 12:03) Wilson said.

When you run a venture fund, your single best investment often returns the entire fund on its own. Artificial caps prevent you from backing that winner through follow-on rounds, forcing you to dilute your ownership right when execution risk drops. Wilson points out that true portfolio protection requires far fewer positions than Wall Street claims.

“Charlie Munger would say if you have three, you're fine,” (play from 16:14) Wilson noted. “There's really no quantitative benefits beyond 30 for 30 underlying look through exposures.” (play from 16:16) Beyond 30 companies, extra positions dilute your returns without reducing real risk.

Anchoring on Early Check Sizes Costs Billions

Even disciplined investors suffer from psychological anchors. When an early position grows tenfold, human nature says you won and should stop buying. Wilson admits that reference-price bias was his most damaging mistake while running WashU's endowment.

“I think if I look back, the biggest mistake that I've made since I've been at WashU is not adding capital to our winners just because they became a relatively sizable position early on,” (play from 14:59) Wilson said.

Investors fear buying shares at a higher valuation than their entry point. If you invested at a $50 million valuation, buying at $500 million feels painful, even if the business is on track to hit $50 billion. That hesitation deprives your fastest-growing assets of the capital they deserve.

What to Do With This

Audit your balance sheet or startup focus this week. Identify the single asset, channel, or customer segment generating more than 60% of your real growth. Calculate how much time or capital you added to it last quarter compared to your underperforming projects. If you spent more effort fixing problem areas than feeding that lead asset, freeze new spending on your bottom three initiatives on Monday and redirect those resources directly into your top winner.