The fund Warren Buffett told ordinary investors to buy for decades has just become the first exchange-traded fund in history to cross $1 trillion in assets under management. As of June 2, 2026, the Vanguard S&P 500 ETF — ticker VOO — crossed that threshold, cementing what Buffett spent six decades telling people to believe: you do not need to beat the market; you just need to own it cheaply. This week, with Berkshire Hathaway shares trading at an eight-month high and the company’s first full-quarter earnings report under new CEO Greg Abel expected Saturday, August 8, that advice is getting a fresh look — and the numbers still hold up. Mostly.
SPIVA Scorecard Data: What Active Managers Cannot Do
Every year, S&P Dow Jones Indices publishes the SPIVA U.S. Scorecard, which measures what percentage of actively managed funds beat their benchmark index. The year-end 2025 edition, published March 3, 2026, delivered one of the most decisive verdicts in the scorecard’s 25-year history. In 2025, 79% of all active large-cap U.S. equity funds underperformed the S&P 500 — the fourth-worst showing for active managers since S&P Dow Jones Indices began keeping score in 2002. Over a trailing 10-year period, the ratio of active managers unable to beat the index has historically exceeded 85%, according to SPIVA historical data.
These numbers explain the $1 trillion. When most professional investors, given every resource and every informational advantage, still fall short of the index over a decade, the rational response for someone without those resources and without that time to spend is to stop trying and own the index instead. Buffett made this argument explicitly in his 2013 Berkshire Hathaway shareholder letter, when he wrote that he planned to instruct that 90% of his wife’s inheritance be invested in a low-cost S&P 500 index fund — specifically naming Vanguard’s. VOO’s 303% total return over the decade ending July 28, 2026 is the scoreboard on that argument.
How VOO Makes the 0.03% Expense Ratio Work: Market-Cap Weighting Explained
A reader who simply hears “low-cost index fund” and moves on is missing the engineering reason the low cost is possible. It is not that Vanguard is unusually generous. It is that market-cap weighting, the method used to construct the S&P 500 and thus VOO, makes expensive portfolio management unnecessary.
In a cap-weighted index fund, each stock’s weight inside the fund equals that stock’s share of the total market value of all 500 companies. As stock prices move throughout the day, those weights automatically adjust — the fund stays “in balance” without any manager having to decide to buy or sell. The only moment the fund needs to trade actively is when the S&P 500 itself reconstitutes (adding or removing companies, which happens roughly four times per year). Between those reconstitution events, no research staff, no analyst team, and no trading desk is needed. That structural simplicity is why VOO can charge 0.03% annually — $3 per year on every $10,000 invested — versus the average 0.72% expense ratio for comparable active large-cap equity funds, according to Vanguard’s published data.
The difference compounds dramatically over time. On a $10,000 investment growing at 10% annually, the gap between 0.03% and 0.72% in fees translates to a material difference in terminal wealth over 30 years — a consequence of paying a fraction of a percent more each year on a growing base. This is the core of Buffett’s argument: fees are the most reliable drag on long-term investment returns, and the only way to eliminate most of them is to stop paying for active management that, as SPIVA documents, rarely justifies its cost.
Buffett Steps Back: His Record and the Numbers That Follow
Buffett officially stepped down as Berkshire Hathaway CEO on January 1, 2026, handing the role to Greg Abel after six decades at the helm, per the official Berkshire announcement. He remains Executive Chairman of the board and has pledged to continue providing perspective in annual letters, but the direct operational era is over.
The record he leaves behind is almost mathematically implausible. From 1965 through 2024, Berkshire compounded returns at 19.9% annually — nearly double the S&P 500’s 10.4% over the same period — producing an overall gain of more than 5.5 million percent, according to Berkshire’s 2024 annual report. A $10,000 investment at the start of that period, at that rate, would be worth several hundred million dollars today — an outcome that is, by Buffett’s own reckoning, essentially impossible to replicate.
Berkshire Hathaway shares hit an eight-month high during the week of July 28, 2026, with BRK/B trading at $512.37 — the highest close since November 28, 2025. Abel’s first full-quarter results as CEO are scheduled for Saturday, August 8, and will include the company’s updated cash position (approximately $397 billion at the end of Q1 2026, per Berkshire’s SEC filings) and a definitive count of the stock buybacks Berkshire appears to have executed in Q2. The earnings report will be Abel’s first extended public test.
The context for that test helps explain why the $1 trillion VOO milestone matters to investors who will never own Berkshire stock. Buffett’s stated investment advice for ordinary people was never “do what I do.” It was the opposite. “Never bet against America,” he said repeatedly, but he translated that conviction into something operationally useful: own the broadest, cheapest, most passive slice of American business available, and wait. VOO is that slice. That it now holds $1 trillion means tens of millions of investors have listened — and the data suggests they were right to.
Concentration Risk: What $1 Trillion in One Fund Actually Means
There is a number Buffett’s passive-investing advice did not anticipate, and it is embedded inside VOO’s structure right now.
By the end of 2025, the 10 largest companies in the S&P 500 accounted for roughly 40.7% of the index’s total weight — a record, and nearly double the 19% to 23% range that characterized the index between 1990 and 2015, according to RBC Wealth Management’s “Great Narrowing” analysis of S&P 500 constituent data. For comparison, top-10 concentration peaked at approximately 27% during the dot-com bubble in 2000. The current concentration is higher.
The mechanism that makes this happen is the same one that makes VOO cheap: market-cap weighting. As Nvidia, Microsoft, Apple, Amazon, and Alphabet have grown larger in market value, their weights inside the S&P 500 have grown proportionally — and so has every passive investor’s exposure to them. Nvidia alone has commanded roughly 7% to 8% of VOO’s weight in 2026. That means a single earnings miss, an export control tightening, or a regulatory setback at one company can move the entire fund meaningfully.
RBC’s analysis identified three specific risks this concentration creates. The first is idiosyncratic shock risk: when no single company carried more than 2% to 3% of the index’s weight, an individual stock event had limited fund-level impact. That is no longer true. The second is thematic correlation risk: the mega-cap technology companies dominating VOO’s top positions tend to respond to the same macro variables — interest rates, AI spending narratives, export restrictions — meaning a single catalyst can move many of them in the same direction simultaneously. July 29, 2026 illustrated this: China’s CXMT memory chipmaker debuted on the Shanghai exchange and three Federal Reserve presidents dissented in favor of an immediate rate hike, and VOO fell 1.52% in a single session as technology names sold off across the board. The third risk is an earnings-weight divergence: the top 10 companies represented about 41% of the index’s weight at year-end 2025, but generated only about 32% of its projected earnings, according to RBC’s FactSet analysis.
RBC’s view is that elevated concentration alone is not sufficient evidence of a speculative bubble — unlike the dot-com era, today’s largest companies are genuinely highly profitable businesses with strong cash flows and durable competitive advantages. But the “Great Narrowing” does mean that owning “the whole market” through VOO is, in practice, a more concentrated bet than it was 10 or 20 years ago. That distinction matters for investors who have been told that index investing is inherently diversified.
Does Index Concentration Change Buffett’s Advice?
The short answer from available data: not fundamentally, but it adds a dimension the original advice did not require investors to consider.
Buffett’s core argument for passive index investing was always about fees and the limits of professional stock-pickers. Both of those arguments remain as strong as they were in 2013. SPIVA’s 2025 scorecard was one of the worst years on record for active managers, and the 0.03% vs. 0.72% expense ratio gap has not changed. The fee math still favors passive investors compounding over decades.
What has changed is the degree to which “buy the whole market” means “buy a concentrated position in mega-cap technology.” The equal-weight alternative — funds like Invesco’s RSP, which allocates roughly equal weight (~0.2%) to each of the 500 constituents regardless of market cap — eliminates the concentration feedback loop entirely. RSP historically outperformed the cap-weighted S&P 500 by approximately 1.5% per year from 2003 through 2022, according to RBC Wealth Management’s analysis, before underperforming during the Magnificent Seven-driven rallies of 2023 through 2025. Whether that underperformance reverses depends on whether the current mega-cap concentration eventually normalizes.
For most investors with long time horizons — twenty or thirty years — the historical data still supports the Buffett thesis. The S&P 500 has historically produced approximately 10% annual total returns over multi-decade periods. Single-session declines, sector selloffs, and even multi-year bear markets have been absorbed by the index’s long-term earnings trajectory. The concentration risk is a real structural consideration, not a reason to abandon the approach — but it is a reason to understand what you own and how it is constructed.
What Greg Abel Does Next With $400 Billion
The question that hangs over Buffett’s legacy in a more practical sense is not about VOO. It is about what Abel will do with the approximately $400 billion in cash and Treasury bills that Berkshire Hathaway has accumulated — a position that has grown precisely because Buffett and Abel found few investments they believed were priced attractively. Abel indicated at the 2026 annual meeting in May that artificial intelligence is on Berkshire’s radar, but that the company would not “do AI for the sake of AI.”
Abel’s first full-quarter report as CEO is expected Saturday, August 8. Analysts and investors will be watching for three specific numbers: the updated cash and Treasury position (which will confirm whether the deployment rate has accelerated), the buyback volume for Q2 2026 (Berkshire appears to have repurchased approximately $11 billion worth of stock in the quarter, per Barron’s analysis), and any new equity positions that clarify the direction of Abel’s portfolio strategy.
Morningstar analysts have anticipated that Abel would apply a more operationally engaged approach to Berkshire’s subsidiaries than Buffett’s famously hands-off management style, potentially generating returns from operating improvements that Buffett’s later-career posture left unrealized. Whether that translates to better capital allocation outcomes than simply owning VOO — the fund Buffett told his wife’s estate to buy — will take years to answer.
For now, the $1 trillion in VOO’s vaults is the clearest statement available about what most investors think is the better bet.
Disclosure: This article is for informational purposes only and does not constitute investment advice. Past performance is not indicative of future results. Consult a qualified financial advisor before making investment decisions. TechTimes is not a registered investment advisor.
Frequently Asked QuestionsWhy did VOO become the first ETF to reach $1 trillion in assets?
VOO reached $1 trillion on June 2, 2026, for three interconnected reasons. The first is fees: its 0.03% annual expense ratio, made possible by the market-cap weighting method that requires almost no active trading or management between index reconstitutions, is effectively unmatchable by any actively managed fund. The second is performance validation: the SPIVA Year-End 2025 scorecard published March 3, 2026, found that 79% of actively managed large-cap US equity funds underperformed the S&P 500 in 2025 — the fourth-worst year for active managers in the scorecard’s 25-year history — confirming that the advice to stop paying for active management continues to be empirically correct. The third is time: VOO launched in September 2010, and a decade of compounding at low cost in a generally rising market has made it the default choice for individual investors, 401(k) plan participants, and advisors building low-cost portfolios.
Is the S&P 500 still truly diversified, or has it become a tech fund?
This is the right question to ask in 2026. The top 10 companies in the S&P 500 represented approximately 40.7% of the index’s total weight at year-end 2025, according to RBC Wealth Management’s “Great Narrowing” analysis — nearly double their 19% to 23% historical range between 1990 and 2015, and higher than the 27% peak concentration during the dot-com bubble of 2000. Because VOO uses market-cap weighting, which automatically allocates more money to bigger companies, passive investors now allocate roughly 40 cents of every dollar to just 10 stocks. The index is not a tech fund — all 11 sectors are represented — but its returns and volatility are increasingly driven by a small number of very large technology and AI-adjacent companies. Investors who want genuine equal-weight diversification across all 500 companies can look at equal-weight index fund alternatives, which eliminate the concentration feedback loop at the cost of underperforming during periods when large-cap tech leads the market.
What does Warren Buffett actually recommend ordinary investors do?
Buffett has been explicit about this for decades. In his 2013 Berkshire Hathaway shareholder letter, he wrote that he plans to direct 90% of his wife’s inheritance into a low-cost S&P 500 index fund — specifically naming Vanguard’s — and 10% into short-term US Treasury securities. He has consistently said this is not what he does with Berkshire’s capital (Berkshire is a stock-picking and operating business), but it is the right strategy for investors who do not have the time, access, or inclination to research individual companies. Buffett’s phrase “never bet against America” captures the underlying thesis: the S&P 500 is a basket of the largest US companies, and over long periods, US business has proven resilient. Note that this is informational context, not investment advice — TechTimes does not offer financial advice, and past performance does not guarantee future results.
What is the difference between VOO and an equal-weight S&P 500 ETF?
VOO uses market-cap weighting, meaning the larger a company’s market value, the more of your money goes into that company. Nvidia at 7% to 8% of VOO gets seven to eight times more of your investment than a company at 0.1% weight. An equal-weight S&P 500 ETF, such as Invesco’s RSP, allocates roughly equal amounts to all 500 companies regardless of size, so each company gets about 0.2% of your investment. Equal weighting eliminates the concentration risk that comes with cap-weighting — you are less exposed when mega-cap tech sells off — but it also means you are underweight the fastest-growing companies during periods when large-cap leads. RSP outperformed the cap-weighted S&P 500 by about 1.5% per year from 2003 through 2022 but underperformed during the Magnificent Seven-driven tech rallies of 2023 through 2025. Which approach is right depends on your view of whether current mega-cap concentration will persist and whether you are comfortable with the concentrated risk that VOO currently carries.