I'm looking for the best ETF for an S&P 500 index fund.

When looking for the best S&P 500 ETF, you want a fund that tracks the index accurately, boasts massive liquidity, and charges rock-bottom fees. Because they all track the exact same index, performance differences come down almost entirely to the expense ratio and your use case.

The top choices for long-term investors are virtually tied for first place:

• Vanguard S&P 500 ETF (VOO):
  • Expense Ratio: 0.03% per year ($3 for every $10,,000 invested)
  • Best For: Buy-and-hold long-term investors in taxable brokerage accounts. It is one of the largest and most trusted funds on the market.
• iShares Core S&P 500 ETF (IVV):
  • Expense Ratio: 0.03% per year
  • Best For: Investors who prefer the iShares (BlackRock) ecosystem. Functionally identical to VOO in cost and performance.
• SPDR Portfolio S&P 500 ETF (SPLG):
  • Expense Ratio: 0.02% per year (even lower, though it manages a smaller asset base)
  • Best For: Cost-conscious investors looking to shave off every hundredth of a percent, though VOO and IVV offer slightly higher daily trading volume.
• SPDR S&P 500 ETF Trust (SPY):
  • Expense Ratio: 0.09% per year
  • Best For: Active day-traders and options traders. While its fee is higher than VOO/IVV, SPY has unmatched liquidity and the tightest bid-ask spreads in the world. Avoid this for long-term buy-and-hold investing.

If you'd like to narrow this down, tell me:

• Are you investing through a taxable brokerage account or a tax-advantaged retirement account (like an IRA)?
• Do you plan to buy and hold or actively trade options?

If you mean “What’s the best ETF to simply own the S&P 500?”, my default pick is VOO (Vanguard S&P 500 ETF).

VOO tracks the S&P 500, uses full replication, holds about 500 stocks, and currently has a 0.03% expense ratio. Vanguard Advisors Vanguard Advisors IVV also tracks the S&P 500 with a 0.03% expense ratio and has enormous assets and trading volume.

My pick: VOO

For a long-term buy-and-hold investor, I wouldn't overthink the difference between VOO and IVV. Both are excellent and their performance should be extremely close. VOO gets my slight nod simply because it's a straightforward, low-cost Vanguard S&P 500 fund.

One important point: don't choose based on which one has gone up more recently. They're designed to track the same index, so the key factors are fees, tracking quality, liquidity, and how the ETF fits into your account.

If you tell me whether this is for a taxable brokerage account, Roth IRA, traditional IRA, or 401(k) and roughly how much you're investing, I can tell you which S&P 500 option I'd choose and whether you should consider a total-market ETF instead.

If your goal is simple, low-cost, long-term exposure to the S&P 500, my top pick is VOO (Vanguard S&P 500 ETF).

VOO and IVV both track the S&P 500 and charge just 0.03%. Vanguard's current data confirms VOO's 0.03% expense ratio.

Why I'd choose VOO

• Extremely low cost: 0.03% means about $3/year per $10,000 invested.
• Broad diversification: You own the S&P 500's large U.S. companies in one fund.
• Excellent liquidity: It's a very large ETF with tight trading spreads.
• Great for buy-and-hold: There's little reason to pay SPY's substantially higher fee if you're simply investing for the long term.

IVV is essentially just as good. If your brokerage or retirement plan makes IVV more convenient, I'd happily use it instead.

One interesting alternative is SPYM (formerly SPLG), which currently has a 0.02% expense ratio, so it's marginally cheaper than VOO/IVV. Zacks But the difference between 0.02% and 0.03% is tiny, so I'd favor VOO's simplicity and enormous scale.

Bottom line: VOO would be my default choice for an S&P 500 ETF.

If you tell me whether this is for a taxable brokerage account, Roth IRA, 401(k), or another account, plus roughly how much you're investing, I can tell you which fund makes the most sense and whether an S&P 500 fund or total-market ETF would be better for you.

When looking for the best S&P 500 ETF, the good news is that they all track the exact same index (the 500 largest US publicly traded companies), meaning their performance is virtually identical. The differences come down to expense ratios (fees), share price , and liquidity.

The top S&P 500 ETFs break down as follows:

1. State Street SPDR Portfolio S&P 500 ETF (formerly SPLG / SPYM)
   • Expense Ratio: 0.02%
   • Best For: The lowest cost and a lower per-share price, making it exceptionally budget-friendly if you are buying whole shares with a smaller account.
2. Vanguard S&P 500 ETF (VOO)
   • Expense Ratio: 0.03%
   • Best For: Long-term buy-and-hold investors. It is one of the largest, most trusted, and most heavily traded core funds in the world.
3. iShares Core S&P 500 ETF (IVV)
   • Expense Ratio: 0.03%
   • Best For: Investors who prefer BlackRock's iShares ecosystem or want identical cost-efficiency to VOO with fantastic tax efficiency.
4. SPDR S&P 500 ETF Trust (SPY)
   • Expense Ratio: 0.0945%
   • Best For: Active traders and options markets. Because its fee is slightly higher than VOO, IVV, or SPLG, it is not the optimal choice for long-term "set-it-and-forget-it" investing, despite being the oldest and most famous.

Summary Recommendation

If you are investing for the long haul, VOO, IVV , and SPLG are virtually tied as the best choices. If your broker allows fractional shares, any of them will treat you right, though SPLG edges out slightly on raw fee percentage and share cost accessibility, while VOO remains the crowd favorite for core portfolios. You can research further or check live pricing details directly on platforms like Yahoo Finance or ETF Database.

To help narrow it down, are you investing through a specific brokerage account (like Fidelity, Vanguard, or Schwab), and do you plan to buy whole shares or fractional shares?

Here are top web results for exploring this topic:

Morningstar·https://global.morningstar.com The Best S&P 500 ETFs to Buy Now | Morningstar Canada Vanguard S&P 500 Index ETF. Fund Size. : C$35.3 billion; MER: 0.09. Morningstar Medalist Rating. : Gold. Over the past year, the Vanguard fund rose 21.73%, while the average fund in its category rose justETF·https://www.justetf.com Find The Best S&P 500 ETF - justETF S&P 500 ETFs in comparison. The most important factors at a glance. Besides return, there are further important factors to consider when selecting a S&P 500 ETF. In order to provide a sound decision b Reddit·https://www.reddit.com**Best S&P 500** Funds : r/ETFs - Reddit Low fees is the name of the game. John Oliver made a great episode on how much difference fees make in the long term of compounding. In this example, Fidelity charges half the fees of Vanguard. That's NerdWallet·https://www.nerdwallet.com The Top S&P 500 ETFs for August 2026: IVV, VOO and More What's the best S&P 500 ETF? If you search for S&P 500 ETFs, you may come across dozens of funds. Just because S&P 500 is in a fund's name doesn't necessarily mean it tracks the index as a whole. Rath Yahoo Finance·https://finance.yahoo.com Top S&P 500 ETFs List | Screener - Yahoo Finance 7. SPYD. State Street SPDR Portfolio S&P 500 High Dividend ETF. 50.43, +0.12, +0.24%, 857,704, +18.85%, +8.09%, +4.67%, +3.97%, +32.71%, 0.07, 0.07, 8.695B. 49.09, 46.37. 41.87 50.90. US. State Street US News Money·https://money.usnews.com 5 ETFs That Outperform the S&P 500 | Investing - US News Money Invesco S&P 500 Momentum ETF (SPMO). SPMO tracks the S&P 500 Momentum Index, which includes about 100 stocks that have shown strong price gains over the past six and 12 months, adjusted for how volati Fidelity Investments·https://www.fidelity.com Investing in ETFs | Low-cost & tax-efficient ETFs - Fidelity Investments Featured ETFs and ETPs ; iShares Core S&P 500 ETF. The investment seeks to track the investment results of the S&P 500 composed of large-capitalization US equities. · iShares Core S&P 500 ETF. The inv YouTube·https://www.youtube.com I Compared the 7 Best S&P 500 Index Funds (1 Clear WINNER!)The best S&P 500 ETF was not covered in this video. SPMO, the Invesco S&P 500 Momentum ETF, outperforms all of these funds by a considerable margin. For example, SPMO has beaten VOO by 246% since it's Investopedia·https://www.investopedia.com Choosing the Best S&P 500 ETF : Key Considerations - Investopedia The S&P 500 Index provides a snapshot of the U.S. economy, tracking the top 500 largest corporations. SPY, VOO, and IVV are leading S&P 500 ETFs with varying expense ratios and dividend strategies. SP Morningstar·https://www.morningstar.com 3 Top US ETFs for 2026 and Beyond | Morningstar The cheapest one is State Street SPDR Portfolio S&P 500 ETF, ticker SPYM. It charges just 2 basis points. Consequently, it performed the best over the past 10 years compared to the other S&P 500 ETFs.

If you want a simple, long-term S&P 500 index ETF, my top pick is VOO (Vanguard S&P 500 ETF).

My ranking

Why VOO: It tracks the S&P 500, has an extremely low 0.03% expense ratio, enormous assets, and is designed as a straightforward long-term core holding. Vanguard currently reports the 0.03% expense ratio.

IVV is essentially just as good. It also tracks the S&P 500 and charges 0.03%.

SPYM is interesting because its expense ratio is only 0.02%, making it technically the cheapest of these choices. State Street reports that it tracks the S&P 500 and currently has about $169 billion in assets.

I'd generally choose VOO over SPY for a buy-and-hold investor. SPY's big advantage is trading liquidity, but its 0.0945% expense ratio is substantially higher.

Bottom line

If you told me, "I want to invest in the S&P 500 for 10–30 years and don't want to overthink it," I'd pick VOO.

One important caveat: the "best" ETF can depend on whether this is a 401(k), IRA, Roth IRA, or taxable brokerage account, and on whether you're investing a lump sum or making monthly contributions. If you tell me which account you're using and roughly how much you're investing, I can recommend the best choice and explain VOO vs. IVV vs. SPYM for your situation.

If you want a simple, low-cost ETF that tracks the S&P 500, my top choice is VOO (Vanguard S&P 500 ETF).

My ranking

VOO, IVV, and SPY all track essentially the same S&P 500 index, so their investment performance is very similar before fees. The biggest practical difference is cost: VOO and IVV charge just 0.03%, while SPY is considerably more expensive.

Why I'd pick VOO: its 0.03% expense ratio is extremely low, it's highly liquid, and it is designed specifically as a long-term core holding. At that fee, you'd pay roughly $3 per year for every $10,000 invested.

IVV is effectively just as good. It also charges 0.03% and tracks the S&P 500. www.etf.comwww.ishares.com If your brokerage makes IVV easier or cheaper to buy, there's little reason to prefer VOO.

One important distinction: if by "S&P 500 index fund" you mean the best single fund for your entire portfolio, rather than specifically an S&P 500 tracker, I'd also consider a total-market or total-world ETF because the S&P 500 excludes smaller U.S. companies and international stocks.

If you tell me your age, investment horizon, and whether this is a taxable account, Roth IRA, or 401(k), I can tell you which ETF I'd choose and how I'd allocate it.

When looking for the best S&P 500 ETF, the short answer is that VOO, IVV , and SPLG are nearly identical in performance because they all track the exact same 500 companies . The differences come down to cost (expense ratio) and your specific use case.

The top choices compare as follows:

• Vanguard S&P 500 ETF (VOO): Best for long-term buy-and-hold retail investors. It features an ultra-low expense ratio of 0.03% ($3 annually per $10,000 invested) and has grown to become one of the largest ETFs in the world . Vanguard’s investor-owned structure makes it a favorite for core portfolio building.
• iShares Core S&P 500 ETF (IVV): Best institutional alternative to VOO. Managed by BlackRock, it matches VOO's ultra-low expense ratio of 0.03% and delivers virtually identical total returns, with high liquidity and efficiency.
• SPDR Portfolio S&P 500 ETF (SPLG): Best for the absolute lowest fee / smaller accounts. Formerly known as SPYM, State Street prices this fund with an even lower expense ratio of 0.02%, and a lower per-share price makes it very budget-friendly if you aren't using fractional shares.
• SPDR S&P 500 ETF Trust (SPY): Best for active traders and options. SPY is the oldest and most heavily traded S&P 500 fund, boasting an unmatched options market ecosystem . However, its expense ratio is higher at 0.0945% ($9.45 per $10,000), making it less ideal for long-term buy-and-hold investing compared to VOO or IVV.

Are you planning to use this as a long-term buy-and-hold investment or for active trading/options , and does your broker support fractional shares ? I can give you a final specific recommendation based on those details.

When looking for the best S&P 500 ETF, the short answer is that VOO, IVV , and ultra-low-cost alternatives like SPLG are practically identical in performance and holdings because they all track the exact same index . The differences come down to expense ratios (fees), fund structure , and trading goals.

The top options break down as follows:

• Vanguard S&P 500 ETF (VOO)
  • Expense Ratio: 0.03% ($3 on a $10,000 investment)
  • Best For: Long-term buy-and-hold retail investors. It is massively popular, highly trusted, and backed by Vanguard's investor-owned structure.
• iShares Core S&P 500 ETF (IVV)
  • Expense Ratio: 0.03%
  • Best For: Investors using brokerages other than Vanguard (like Fidelity or Schwab), or those looking for an identical alternative to VOO for tax-loss harvesting. It is managed by BlackRock.
• SPDR Portfolio S&P 500 ETF (SPLG)
  • Expense Ratio: 0.02% ($2 on a $10,000 investment)
  • Best For: Fee-conscious investors looking for the absolute lowest cost among major S&P 500 ETFs. (Note: State Street also manages SPY , but SPY has a higher fee of 0.09% because it is optimized for heavy day-trading and options liquidity rather than long-term holding).

To help narrow down which one makes the most sense for you, tell me:

• Which brokerage platform do you use (e.g., Vanguard, Fidelity, Schwab, Robinhood)?
• Are you planning a long-term buy-and-hold strategy or active trading/options?

If your goal is simply “own the S&P 500 for the long term at very low cost,” my top choices are:

VOO and IVV both charge just 0.03% and track the S&P 500. SPYM is now even cheaper at 0.02%, according to State Street. SPY is considerably more expensive for a long-term buy-and-hold investor, despite its enormous liquidity.

My pick: VOO

For a long-term retirement/taxable investment, I'd lean toward VOO. There's very little practical difference between VOO and IVV—their costs and underlying exposure are essentially identical. VOO has also accumulated enormous assets, making it a very established core holding.

The interesting newcomer is SPYM: at 0.02%, its annual fee is about $2 per $10,000 invested, versus $3 for VOO/IVV. That's a tiny difference, so I wouldn't switch from an existing VOO/IVV position solely to save that 0.01%.

Bottom line:
Starting from scratch → VOO.
Already own IVV → keep IVV.
Want the absolute lowest expense ratio → SPYM.
Primarily trading options → SPY.

If you tell me whether this is for a taxable brokerage, Roth IRA, traditional IRA, or 401(k), plus roughly how much you're investing, I can tell you which one I'd choose and why.