Most wealth in equity markets is created by a handful of companies. The question is whether investors are positioned to keep them, or disciplined enough to stop themselves from trimming them away.
In a new whitepaper from Meketa Investment Group1, contributor Frank Benham, CFA, CAIA, addresses one of the most consequential — and most misunderstood — structural realities in long-run investing: that equity wealth creation is profoundly skewed, and that capturing the upside has far less to do with selection than with the patience and discipline to hold a broad portfolio and resist the urge to intervene. The paper examines this dynamic across both public and private markets, tracing a single phenomenon through different stages of a company's life.
The Skew Is the Structure
The paper opens with a foundational observation that reframes the entire conversation about equity risk. "Roughly 2% of companies produced about 90% of the aggregate net wealth," Benham notes, citing research updated through December 2024, "and a handful of names, including Apple, Microsoft, NVIDIA, Alphabet, Amazon, and ExxonMobil, together added on the order of $17 trillion in value." The median stock, by contrast, produced a negative lifetime return and failed to beat short-term Treasury bills.
This is not a market anomaly. It is the market's architecture. A stock can lose no more than 100% of its value, but its gains are unbounded. Compounding does the rest. Benham explains: "The firms that grow fastest also tend to survive and to reach the largest size." The longer a volatile investment is held, the more its possible outcomes tilt toward a few very large gains — even when year-to-year returns are evenly balanced. Positive skewness, in this reading, is largely a mechanical product of time and volatility, not exceptional stock-picking.
The same logic applies in venture capital, only more acutely. Less than 4% of invested dollars returned 10x or more. Nearly half of all deals lost money. Public equity and venture capital are therefore not two separate phenomena — they are the same phenomenon observed at different points in a company's life. VC captures the asymmetry at the earliest and most uncertain stage; public markets capture it later, after many failures have already been screened out.
Two Principles That Pull in Different Directions
Benham distinguishes two principles that both serve right-tail capture but have opposite implications for portfolio concentration. The first is breadth of inclusion: because no one can know in advance which companies will drive the aggregate result, owning a broad cross-section of the market raises the probability of holding the eventual winners. The second is restraint in trimming: once a company grows into a large position, selling it back to a smaller weight shifts capital away from the wealth-creating part of the portfolio toward the part that has not created wealth.
A capitalization-weighted index satisfies both simultaneously and at low cost. It holds the entire market, and it never sells a company simply for becoming large. "Concentration in such an index is therefore not a flaw that has crept in," Benham writes. "It is the visible result of the index doing what it is designed to do, which is to reflect the market's own allocation of value."
Equal-weighted and capped indices, frequently proposed as a more prudent path, do the opposite. They reduce exposure to the companies most responsible for long-run wealth creation and tilt the portfolio toward smaller, cheaper, more value-oriented names. Their historical outperformance — notably in the years following the dot-com peak and the Global Financial Crisis — depended on extended stretches in which the largest companies delivered persistently low returns. That is a cyclical bet on value and size, not a general benefit from trimming winners.
Private Markets: The Same Logic, Harder to Execute
In private equity, the same two principles apply. But there is no investable equivalent of a capitalization-weighted index. Breadth must be constructed deliberately. And crucially, access matters in a way it simply does not in public markets.
"The most significant difference is that the right tail in private equity is gated by access and selection in a way that the right tail in public equity is not," Benham observes. The average return in venture capital is 23.5%, versus a median of 14.9% — a distinctly positive skew that confirms the return investors seek lives in the top funds. Performance persistence is meaningful in venture capital, driven by preferential access to the best opportunities. The strongest funds are frequently oversubscribed and closed to new capital.
For investors who cannot be confident of access to the strongest managers, broad diversified VC exposure raises the floor more than it raises the ceiling — the opposite of how breadth functions in public markets. Patience adds another structural dimension: VC funds may hold investments for a decade or more, and much of the asymmetry in a successful company's return may accrue while it is still private. "By the time a company reaches the public market through an initial public offering," Benham notes, "a large share of its early growth, and the steepest part of its return, has often already been realized by private holders."
Capturing the Right Tail Without Chasing It
The behavioral and governance implications are direct. Capturing the right tail means accepting that a portfolio grows more concentrated over time, holding individual names through severe declines without intervening, and resisting the temptation to act when discomfort peaks. The average peak-to-trough decline for Apple, Microsoft, NVIDIA, Alphabet, Amazon, and ExxonMobil was 80% at some point in each company's history — comparable to the average stock. Holding them required conviction through periods in which they did not look like winners.
The conclusion is modest but rigorous. "Capturing the right tail is mostly a matter of not getting in one's own way," Benham writes, "by owning the market as it is, including its largest names, resisting the urge to trim winners, sourcing downside protection from elsewhere in the portfolio, and allowing the time the asymmetry requires." Downside risk is better addressed through bonds and risk-mitigating strategies held elsewhere in the portfolio than by reducing exposure to the equity holdings that have generated the wealth.
Five Key Takeaways for Advisors and Investors
- Concentration is the right tail made visible, not a risk to engineer away. In a cap-weighted index, large positions are the outcome of letting winners run. Reducing them mechanically trims the exact source of long-run wealth creation.
- Selection is not the same as capture. The evidence against active stock selection — and against systematically overweighting lottery-like names — is extensive. The right tail is most reliably captured by holding the whole distribution, not by choosing from within it.
- Public equity does the heavy lifting automatically; private equity requires deliberate construction. Breadth, access, diversification across managers and vintage years, and a horizon of a decade or more are the four conditions that give a private equity program a realistic chance at right-tail exposure.
- Downside protection belongs outside the equity allocation. High-quality bonds and risk-mitigating strategies cushion drawdowns without trimming the winners. Risk mitigation sourced from within the equity sleeve works by reducing the very exposure the investor is trying to hold.
- Governance matters as much as portfolio construction. Institutions that set policy in calm conditions — with clear drawdown tolerance and rebalancing rules established in advance — are far better positioned to hold right-tail exposure through stress than those that revisit the question in the middle of a decline.
Footnote:
1 Benham, Frank. Investing for the Right Tail: Asymmetric Wealth Creation Across Public and Private Markets. Meketa Investment Group, Aug. 2026, https://meketa.com/wp-content/uploads/2026/08/MEKETA_Right-Tail-Investing.pdf.
