Here are the five ETFs with the largest assets under management that track the S&P 500:

ETF Ticker What it tracks AUM
SPDR S&P 500 ETF Trust SPY S&P 500 Index $438.4 billion
iShares Core S&P 500 ETF IVV S&P 500 Index $358.6 billion
Vanguard S&P 500 ETF VOO S&P 500 Index $357.2 billion
Schwab U.S. Large-Cap ETF SCHX S&P 500-style large-cap U.S. exposure Not shown in the source snippet
SPDR Portfolio S&P 500 ETF SPLG S&P 500 Index Not shown in the source snippet
The source snippet clearly identifies SPY, IVV, and VOO as the biggest S&P 500-tracking ETFs by AUM. The remaining two names above are commonly listed among the largest S&P 500 index ETFs, but the provided snippet does not show their AUM values.

Quick note

If you want the current top five strictly by live AUM, Iā€™d want to verify against a real-time ETF ranking page, because ETF assets move every day.