VOO-Frenzy: Why the Crowded ETF Is a Red Flag

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  Published in Stocks and Investing on Saturday, December 13th 2025 at 5:31 GMT by 24/7 Wall St.
      Locale: UNITED STATES

Why “VOO‑Frenzy” Is a Red Flag – and Which ETFs Offer a Safer, More Balanced Alternative

In the past year, Vanguard’s S&P 500 ETF (VOO) has become the “go‑to” holding for many individual investors, especially those who have been following the narrative that the S&P 500 is a reliable proxy for the overall U.S. equity market. Its low expense ratio (0.03 %) and the fact that it tracks a benchmark as universally respected as the S&P 500 have made it an attractive one‑stop solution. However, the 247 Wall Street article titled “Too Many People Pile In To VOO and Should Look At These ETFs Instead” argues that the sheer volume of money poured into VOO is now a structural problem. Below is a detailed summary of the article’s key points, evidence, and alternative ETFs that may offer better diversification, lower fees, or a more strategic allocation for the long‑term investor.

1. The “Crowding” Problem

The author opens with a simple fact: VOO’s assets under management (AUM) have exploded, now topping $280 billion. That level of liquidity and concentration brings two risks:

1. Liquidity Drain During a Sell‑Off – If a large number of investors try to liquidate their VOO holdings at the same time, the sheer volume can push the price down, creating a self‑fulfilling sell wave.
2. Over‑Exposure to the Top 50 Companies – VOO is built from the same 500 constituents as the S&P 500, and the top 10 companies (Apple, Microsoft, Amazon, Alphabet, Meta, Tesla, Nvidia, Berkshire Hathaway, JPMorgan, and Johnson & Johnson) account for roughly 25 % of the fund’s total weight. A shock to any of these giants can reverberate across the entire ETF.

The article cites a 2023 Morningstar analysis that shows “crowding” – the ratio of an ETF’s market cap to its underlying index’s market cap – has climbed to 1.6 for VOO, while the healthy range is generally 0.6‑1.2. The authors suggest that such a ratio indicates a premium that may not be justified by fundamentals.

2. The “Too Much Risk” of Concentration

While VOO’s top holdings are well‑known, they are heavily weighted in growth and technology sectors. The article’s chart demonstrates that the tech sector alone accounts for 33 % of VOO’s exposure. In contrast, a more balanced U.S. allocation – including mid‑caps, small‑caps, and sectors such as utilities, consumer staples, and health care – is lacking.

The author points out that this concentration amplifies risk. For example, the 2022 “Tech Rebound” after the pandemic slump exposed VOO to a sharper rebound than a diversified index, but it also made the ETF more sensitive to tech‑specific headwinds, such as regulatory scrutiny or interest‑rate tightening.

3. Why the “Alternative” ETFs Make Sense

The article then pivots to recommending several ETFs that, according to the author, provide better diversification or lower cost. These alternatives are grouped into three buckets: Total U.S. Equity, Sector‑Specific, and International. Below are the highlighted ETFs and why they stand out.

a. Total U.S. Equity – Broadening the Horizon

Why VTI is the “go‑to” for many – VTI adds approximately 35 % more small‑cap exposure compared to VOO and has a top‑holding weight of 13 % versus VOO’s 14 % (Apple). The article shows that over the last decade, VTI has delivered roughly 0.6 % higher total returns than VOO, largely due to its broader risk profile.

b. Sector‑Specific – Targeting Underserved Sectors

Strategic Takeaway – By allocating a portion of your portfolio to a mid‑ or small‑cap ETF, you dilute the concentration risk of VOO and potentially capture higher growth in the lower‑priced parts of the market. The article cites a 2024 study that shows a 70/30 mix of VOO and VTI (70 % VOO, 30 % VTI) reduced portfolio volatility by 12 % without sacrificing more than 0.4 % of annual return.

c. International – Avoiding U.S. Over‑Concentration

Why it matters – The article explains that U.S. equities have become increasingly correlated with global markets, reducing the “diversification premium” that international equity offers. Adding even 20 % international exposure can shave off ~2 % of risk (measured by standard deviation) in a well‑balanced portfolio.

4. Practical Portfolio Construction

The article’s authors propose a “Three‑Bucket” allocation that balances low cost, diversification, and exposure to growth areas:

1. Core – 60 % in VTI (or SCHB) to capture the full U.S. market.
2. Growth & Mid‑Cap Buffer – 25 % split between VO (mid‑cap) and VB (small‑cap).
3. International – 15 % in VXUS or VEU.

With this mix, the investor can capture the upside of U.S. growth while limiting the risk of concentration. The article presents a back‑tested model that shows a 10 % higher Sharpe ratio versus a pure VOO strategy over a 10‑year horizon.

5. Fees and Operational Costs

While the headline expense ratios for VOO and many alternatives hover around 0.03 %‑0.08 %, the article reminds readers that expense ratio is only one part of the total cost. Bid‑ask spreads, trading commissions (for brokerages that don’t offer commission‑free trades), and tax implications (capital gains from a large, illiquid fund) can all add up.

The author suggests:

• Opt for ETFs with tighter spreads: VTI, SCHB, and VXUS typically have spreads < 0.05 % of NAV, compared to SPY’s 0.1 %.
• Consider tax‑efficient ETFs: For example, the “tax‑efficient” versions of VTI (VTI‑T) or VXUS‑T have lower realized capital gains distributions.
• Watch for “front‑loaded” fees: Some ETFs impose “share‑class” fees that can drag returns if you’re a long‑term investor. Vanguard’s share‑classes usually have the lowest, but always double‑check.

6. Bottom Line – A “Balanced” Take

The article concludes that while VOO remains a solid foundation for a diversified portfolio, its sheer popularity has created a “crowding premium” that may be unsustainable. By adding broader market ETFs, mid‑ and small‑cap exposure, and a slice of international equities, investors can reduce concentration risk, improve risk‑adjusted returns, and avoid the pitfalls of over‑exposure to a handful of mega‑cap names.

For the seasoned investor who is comfortable with a higher level of risk, the article suggests a heavier tilt toward the “Growth” bucket (VOO + VO + VB). For the risk‑averse or retiree, a heavier weight in VTI and VXUS may be preferable. And regardless of the chosen strategy, the recommendation is clear: don’t put all your eggs in one basket.

TL;DR:
- Problem: VOO’s massive AUM and concentration risk are creating a “crowding premium.”
- Solution: Mix in broader U.S. ETFs (VTI, SCHB), mid‑/small‑cap funds (VO, VB, IJH), and international exposure (VXUS, VEU).
- Result: Lower risk, potentially higher risk‑adjusted returns, and a more robust portfolio that isn’t vulnerable to a handful of big‑cap stocks.

Readers are encouraged to re‑examine their own holdings, especially if they’ve been “glued” to VOO since the pandemic‑era rally, and consider adding a few of these suggested ETFs to improve diversification and resilience.