You cannot trade SPX directly on Robinhood, but you can trade SPY and other funds that track the same index

SPX is the ticker for the S&P 500 Index itself — a collection of 500 large US companies. Robinhood does not let you buy or sell the index directly. What you can do instead is trade SPY, which is an exchange-traded fund (ETF) that holds those same 500 companies and moves almost identically to SPX. You can also trade IVV or VOO, which do the same thing.

The reason SPX cannot be traded on Robinhood or most retail brokers is that it is a cash-settled index, not a security. The exchange that runs SPX (the Chicago Board Options Exchange) allows only certain institutional traders and market makers to hold it. If you want exposure to the S&P 500, SPY, IVV, and VOO are the practical alternatives, and they behave almost identically to SPX for most purposes.

Key Takeaways

  • SPX is an index, not a stock or fund, so Robinhood cannot offer it for direct purchase.
  • SPY, IVV, and VOO are ETFs that track the S&P 500 and can be traded on Robinhood with the same commission-free structure.
  • SPY is the most heavily traded of the three and will have the tightest bid-ask spread, meaning lower costs when you buy or sell.
  • You can also trade options on SPY through Robinhood if your account has options approval, but not on SPX itself.

Why SPX cannot be traded on Robinhood

SPX is a price index, not a tradable security. It is calculated and maintained by the Chicago Board Options Exchange and represents the value of 500 large-cap US stocks. Because it is an index and not a fund or company share, there is nothing to actually buy or sell — it is a number, like a temperature reading.

Options on SPX do exist and trade on the CBOE, but they are restricted to institutional traders, professional investors, and market makers. Robinhood is a retail broker, meaning it serves individual investors, and the regulatory structure does not permit it to offer SPX options or direct index trading to that audience.

SPY, IVV, and VOO: the practical alternatives

All three of these ETFs hold the same 500 companies in the S&P 500 and track the index so closely that for most investors the difference is negligible. You can buy and sell any of them commission-free on Robinhood, just as you would a stock.

SPY is the oldest and most heavily traded. Because so many people buy and sell it every second, the gap between the bid price (what buyers offer) and the ask price (what sellers want) is usually the smallest of the three. That gap, called the bid-ask spread, is a real cost to you when you trade, so SPY's tighter spread saves money on entry and exit.

IVV and VOO are newer and less traded, so their spreads are slightly wider. For a one-time purchase of a few hundred dollars, the difference is usually a few cents. For frequent trading or large positions, SPY's liquidity advantage matters more.

How to trade S&P 500 exposure on Robinhood

Open Robinhood and search for SPY, IVV, or VOO by ticker. Click the stock, then tap "Buy" and enter the number of shares you want. You can buy fractional shares (for example, 0.5 shares if you have $200 and SPY is trading at $400). Robinhood will execute the order during market hours, usually within seconds.

If you want to sell, find the position in your portfolio, tap it, select "Sell," and enter the number of shares. The same fractional-share rules apply. There are no commissions, and Robinhood does not charge a fee to hold the position.

Options on SPY versus options on SPX

If your Robinhood account has options approval, you can trade options contracts on SPY — calls and puts with various strike prices and expiration dates. This lets you bet on the direction of the S&P 500 with leverage, or hedge a position you already own.

You cannot trade options on SPX through Robinhood because SPX options are restricted to institutional traders. If you want options exposure to the S&P 500, SPY options are your only choice on a retail platform. The mechanics are the same as any other options trade on Robinhood: you select the contract, the quantity, and the order type, and Robinhood routes it to the market.

Costs and tax considerations

Robinhood charges no commission to buy or sell SPY, IVV, or VOO. The only cost is the bid-ask spread — the difference between what you pay to buy and what you receive to sell. For SPY, this spread is typically a few cents per share. For IVV and VOO, it may be slightly wider.

When you sell SPY, IVV, or VOO at a profit, you owe capital gains tax on the difference between your purchase price and sale price. If you hold for more than one year, the tax rate is lower (long-term capital gains). If you hold for less than one year, it is taxed as ordinary income. Robinhood will send you a 1099 form at tax time showing your transactions, but you are responsible for calculating and reporting the gains.

Frequently Asked Questions

Can I buy SPX options on Robinhood?

No. SPX options are restricted to institutional and professional traders on the CBOE. Robinhood does not offer them. If you want options exposure to the S&P 500, you must use SPY options instead, which are available to retail investors with options approval.

Is SPY exactly the same as SPX?

SPY tracks SPX so closely that for most investors the difference is invisible. SPY holds the same 500 companies and moves almost identically day to day. The tiny differences come from fees SPY charges (about 0.09% per year) and the timing of dividend reinvestment, but these do not meaningfully affect long-term returns.

Why would I choose IVV or VOO over SPY?

IVV and VOO have slightly lower expense ratios (fees) than SPY — around 0.03% versus 0.09% per year. Over decades, this small difference compounds. However, SPY's tighter bid-ask spread often offsets that advantage for active traders. For a buy-and-hold investor, the fee difference is worth considering.

Can I set up automatic investments in SPY on Robinhood?

Robinhood does not offer automatic recurring investments. You must manually buy SPY each time you want to add to your position. Some investors set a calendar reminder to buy on a regular schedule, or use a different broker that offers automatic investment features.

What happens if SPX goes up or down — does SPY move the same way?

Yes. SPY is designed to track SPX, so when the index rises or falls, SPY rises or falls by nearly the same percentage. The tracking is so close that you can treat them as equivalent for the purpose of understanding your returns.