Market Backdrop
In mid-2026, the push to minimize costs in passive investing remains a top theme for individual and wealth managers alike. The broad U.S. stock rally has kept demand high for simple, cost-efficient exposure to the S&P 500. Vanguard's VOO has long been the default choice for many, thanks to its deep liquidity and tight spreads. Yet a cheaper challenger has emerged, underscoring a persistent truth in indexing: the total return gap often hinges on the fee line rather than the tracking error.
Two Funds, One Index
The SPDR Portfolio S&P 500 ETF, traded under the ticker SPLG, is now widely touted as the same 500-stock wrapper for the S&P 500, but with a lower expense ratio. As of March 19, 2026, SPLG charges 0.02% per year, versus VOO’s 0.03% annual fee. The two funds physically hold the same 500 constituents in the same weights, delivering virtually identical exposure to the U.S. large-cap universe.
What Investors Should Know
For the typical equity investor, this isn’t a debate about the core holdings but about the cost of owning them over time. Analysts say the practical impact is real, especially for plans with fixed-dollar contributions and for accounts that deploy money consistently over decades.
- Expense ratios: SPLG at 0.02% vs VOO at 0.03%. Small one basis point differences add up with long time horizons.
- Asset size: VOO commands a much larger asset base, running well into the hundreds of billions, while SPLG sits in the tens of billions range. The result is a divergence in liquidity and trading dynamics, albeit modest for the vast majority of investors.
- Tracking: Both funds mirror the S&P 500 with negligible tracking error over rolling periods, meaning performance remains tightly aligned with the index.
- Share price dynamics: SPLG trades at a lower per-share price than VOO, which can help automatic investment plans and fixed-dollar contributions when fractional shares aren’t available in all accounts.
Performance Snapshot
Both funds have delivered returns that track the broader market, with near-identical trajectories over common horizons. In the trailing year, the two wrappers have posted gains in the 20s percentage points, with VOO slightly ahead in some periods and SPLG catching up in others due to timing on reinvested dividends and intra-year shifts. Over the last five years, investors have seen solid mid-to-high single- to double-digit annualized outcomes, consistent with the S&P 500’s decade-long run. The ten-year view presents a similar story: long-term exposure to the index has yielded multi-hundred-percent cumulative gains, with only the tiniest gaps between the two funds’ totals, mostly attributable to dividend timing rather than structural differences in composition.
Brokerage commentary and fund research notes emphasize that the practical takeaway is cost efficiency. Said one ETF strategist: "When two funds hold the same stocks in the same weights, the question becomes, what are you paying for the wrapper? A one-basis-point savings adds up."
The Fee Math, Honestly
The practical effect of the fee gap is straightforward. On a $100,000 investment, the annual difference in fees between SPLG and VOO equates to roughly $10 in favor of SPLG. Over a decade, the headline number would be around $100, before compounding and tax effects are considered. Extend that out to 20 years, and the scale nears the low hundreds of dollars—real money for long-term savers, though not a life-changing amount on a single savers’ balance sheet.
For retirement accounts and defined-contribution plans that automate recurring contributions, that annual incremental saving can compound into meaningful outperformance versus a higher-cost wrapper, all else equal. Still, experts caution that the fee gap is just one piece of the decision, especially for investors who care about liquidity, trading ease, and how a fund behaves in stressed markets.
What This Means for Different Investors
Part of the story is behavioral. When the two funds are nearly indistinguishable in outcomes, the cost edge becomes the primary driver for choosing one over the other. The practical questions pivots on liquidity needs, tax considerations, and how often an investor makes contributions on a fixed schedule.
- For dollar-cost averaging with fixed contributions: The lower share price of SPLG could make purchases easier when fractional trading isn’t available, and the lower expense ratio compounds over time.
- For high-net-worth portfolios with large positions: The absolute dollar impact of a 0.01% annual fee can become more noticeable, but the fundamental benefit remains inexpensive exposure to the S&P 500’s growth engine.
- Tax considerations: Both funds are typically held in taxable accounts or tax-advantaged accounts similarly; the tax impact largely follows the index’s dividend distributions and capital gains timing rather than the fee itself.
Risks and Considerations
As with any ETF decision, investors should not focus solely on price. While SPLG and VOO deliver the same index exposure, there are nuances worth noting: liquidity in the secondary market, bid-ask spreads, and the potential for minor discrepancies in dividend reinvestment timing can cause tiny performance deltas on a day-to-day basis. In periods of extreme volatility, those small gaps can feel larger, though they typically vanish over longer holding periods.
Should You Flip Your Preference?
For readers who are asking themselves a familiar question—sooner or later, should I forget VOO and switch to this fund?—the answer hinges on personal costs and plans. If you are a buy-and-hold investor with a long horizon and a strict focus on minimizing ongoing expenses, the switch could make sense, provided you don’t incur trading fees or tax consequences by reallocating positions. If you already own VOO and are satisfied with its liquidity and performance, there may be little reason to rush a move solely to shave a basis point of cost.
One notable caveat is the visibility of the cost difference in smaller accounts. For new investors starting with modest contributions, the aggregate effect of lower fees can be more pronounced, especially when compounding works in your favor. The bottom line: this fund offers the same stock exposure as VOO with a cheaper price tag, which matters in a market where every basis point can accumulate over time.
Bottom Line
The ETF landscape continues to tilt toward lower costs without sacrificing exposure. The emergence of SPLG as an equivalent S&P 500 wrapper at 0.02% expense ratio exposes a straightforward truth: for many investors, the question isn’t whether you own the S&P 500, but how much you pay to own it. If you are considering a move, remember the simple rule experts emphasize: the savings from a lower fee should be weighed against your trading needs, the liquidity you require, and how you plan to deploy capital over the years ahead. For those wondering about the maxim “forget voo, this fund” in real terms, the answer is nuanced but compelling: if cost is your compass, this fund makes a persuasive case for itself without changing the underlying exposure you seek to own.
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