The market capitalization of the S&P 500 (Index: SPX) shrank in the first quarter of 2026. Picking up from our Fall 2025 snapshot when the index' market cap was $59.32 trillion, as of the end of 2026-Q1, it has fallen nearly 1.5% to $58.44 trillion for this Spring 2026 snapshot.
In between then and now, the S&P 500's market cap clocked in with a market cap of $60.80 trillion at the end of 2025-Q4, which is the value we would have reported in our Winter 2025 snapshot had we presented it. In the three months since, the total valuation of all 503 stocks included in the S&P 500 has dropped 3.9%.
Much of the change in the index's value during this time was concentrated within the top ten component stocks that make up the benchmark index. At the end of 2025-Q3, they represented 38.9% of the value of the entire index, which increased to 39.2% at the end of 2025-Q4. After the end of 2026-Q1 however, their share of the index has declined to 36.9%.
The following chart shows the relative shares of the top 10 stocks in the S&P 500 at the end of the first quarter of 2026.
Here are the approximate market capitalizations of each of the S&P 500's top ten component firms at the end trading on 31 March 2026:
- Nvidia (NASDAQ: NVDA) $4,184,635,901,084 (7.16%)
- Apple (NASDAQ: AAPL) $3,641,100,791,027 (6.23%)
- Microsoft (NASDAQ: MSFT) $2,700,142,159,638 (4.62%)
- Amazon (NASDAQ: AMZN) $2,226,740,612,169 (3.81%)
- Alphabet (A) (NASDAQ: GOOGL) $1,829,317,090,837 (3.13%)
- Alphabet (C) (NASDAQ: GOOG) $1,694,894,429,210 (2.90%)
- Meta Platforms (A) (NASDAQ: META) $1,449,426,960,152 (2.48%)
- Broadcom (NASDAQ: AVGO) $1,449,426,960,152 (2.48%)
- Tesla (NASDAQ: TSLA) $1,396,826,788,211 (2.39%)
- Berkshire Hathaway (B) (NYSE: BRK.B) $1,005,247,730,428 (1.72%)
All ten of these firms have trillion dollar market caps, with Berkshire Hathaway joining the trillion-dollar club during the past six months.
References
Standard and Poor. S&P 500 Factsheet. [PDF Document]. 31 March 2026. Accessed 1 April 2026.
SlickCharts. S&P 500 Component Weights. Accessed 1 April 2026.
Labels: market cap, SP 500
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