If You Had Invested $500 a Month in VOO Since Its 2010 Launch, You Would Have About $330,000 Today

A hypothetical investor who set up an automatic $500-a-month purchase of the Vanguard S&P 500 ETF (NYSEARCA:VOO) the day it launched in September 2010 and never touched the account would be sitting on roughly $330,000 today. That is the payoff for holding a plain-vanilla index fund through Ben Bernanke, Brexit, a pandemic, a bear market, and the current AI capex boom. The engine has been mega-cap compounding — driven by names like Nvidia, Apple, Microsoft, Amazon, and Google.

For anyone trying to replicate that outcome, the choice of vehicle matters. This piece ranks five S&P 500 and large-cap US equity ETFs: VOO as the anchor, alongside IVV, SPY, SPLG, and the equal-weighted RSP as the contrarian pick that many long-term investors ignore.

Why S&P 500 Exposure Keeps Winning

The cap-weighted S&P 500 has become, in effect, a leveraged bet on a handful of trillion-dollar businesses. NVIDIA alone carries a $5.27 trillion market cap after posting $96.22 billion in Q2 FY27 revenue, up 106% year over year. Apple sits at $4.85 trillion, Alphabet at $4.07 trillion, Microsoft at $3.68 trillion, and Amazon at $2.77 trillion.

The recent numbers explain why: Microsoft’s Azure crossed $100 billion in annual revenue with 43% growth, Alphabet’s Google Cloud accelerated to 82% growth, and Amazon’s AWS grew 37%, its fastest in 18 quarters. Information technology now represents 38% of the S&P 500 by weight. That concentration is the story. It is also the risk.

VOO: The Anchor Holding

Vanguard’s flagship S&P 500 fund is the cleanest way to own the index. Its 0.03% expense ratio means a $10,000 investment cost just $2 over the last six months. The fund holds 519 positions with a 1% portfolio turnover rate, so tax drag on taxable accounts is minimal. Assets sit at roughly $1.68 trillion, which delivers tight bid-ask spreads and deep liquidity for retail investors.

The compounding math is doing most of the work. VOO has returned 825% on price alone from September 2010 through today, with the shares recently changing hands near $703. Layer on quarterly distributions that have grown from $0.28 in September 2010 to $1.96 in June 2026, and the total-return picture is what turns $500 a month into six figures.

The tradeoff is concentration. When roughly a third of the fund lives in a handful of AI-exposed names, a rerating of that group hits VOO hard. Its 18% one-year gain and 13% year-to-date advance reflect the recent tailwind for the mega-cap group.

IVV: The BlackRock Twin

iShares Core S&P 500 ETF (NYSEARCA:IVV) tracks the same index at the same 0.03% expense ratio. For a taxable brokerage account, the choice between VOO and IVV comes down to which platform you already use and which fund’s tax lots make your record-keeping easier. Inside a Fidelity or Merrill account, IVV is often the default because it trades commission-free with tighter internal execution. Inside Vanguard’s ecosystem, VOO is the natural fit. Long-run tracking difference between the two is negligible.

SPY: Liquidity King, Cost Laggard

SPDR S&P 500 ETF Trust (NYSEARCA:SPY) is the original, launched in 1993, and still the most-traded ETF in the world. It carries a heavier 0.09% expense ratio, which matters over decades. Its top holdings mirror VOO almost exactly: NVIDIA at 8%, Apple at 7%, Microsoft at 5%, Amazon at 4%, and Alphabet’s Class A shares at 3%.

SPY’s real edge is options depth and intraday liquidity. Traders use it as a hedging instrument and short-term expression tool. Buy-and-hold investors paying triple the expense ratio for the same basket give up meaningful long-term return. For the $500-a-month strategy that produced the headline result, SPY is the wrong vehicle.

SPLG: The Overlooked Dollar-Cost Averager’s Friend

SPDR Portfolio S&P 500 ETF (NYSEARCA:SPLG) is State Street’s answer to its own high-cost flagship. It tracks the same index at a rock-bottom expense ratio in the same neighborhood as VOO and IVV, and it trades at a much lower share price. That last detail matters more than it sounds. For an investor putting $500 a month into a brokerage that does not support fractional shares, SPLG lets nearly the entire contribution get to work each month rather than sitting in cash waiting for the next dollar to accumulate. The fund is smaller and less liquid than VOO, but for automated monthly buys, that gap does not show up.

RSP: The Contrarian Equal-Weight Bet

Invesco S&P 500 Equal Weight ETF (NYSEARCA:RSP) flips the compounding thesis on its head. Every stock in the S&P 500 gets roughly the same weight, rebalanced quarterly. NVIDIA, Apple, and Microsoft become 0.2% positions instead of 7% ones. The 0.2% expense ratio is higher than the cap-weighted alternatives, and turnover is meaningfully greater.

RSP is on this list because it addresses the single largest risk in the other four funds. If AI capex disappoints, if antitrust action clips Alphabet’s cash flow, or if any of the trillion-dollar names stumbles, RSP will hold up better than VOO. The reverse has been true for years: cap-weighted has outperformed equal-weighted since 2023. Investors treating RSP as a hedge against index concentration should size it accordingly, not use it as a core replacement.

Choosing the Right Fund for Your Situation

For a long-horizon investor building wealth through monthly contributions in a taxable account, VOO is the default answer, with IVV interchangeable inside BlackRock-friendly brokerages. SPLG makes sense specifically for small-dollar contributors on platforms that lack fractional shares. SPY belongs in the account of anyone who actively trades options or needs same-day liquidity at institutional scale.

RSP is the fund to buy if index concentration is a primary concern. Owning a slice alongside a cap-weighted core is a defensible way to reduce reliance on five stocks while still capturing the broad US equity return stream. The $500-a-month result that produced roughly $330,000 assumed a full cap-weighted ride. Anyone unwilling to stomach the next drawdown in that concentrated top tier needs to know that going in, and choose accordingly.

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