# Nvidia, Apple and Microsoft Hold 20.28% of S&P 500 Index

By Enna Lee

Canonical URL: https://www.tokenpost.com/news/investing/30081
Published: 2026-10-12T06:55:12.000Z
Updated: 2026-10-12T06:55:12.000Z
Section: Investing

> The 10 largest listed positions represented 39.03% of the benchmark in an Oct. 10 snapshot, while Information Technology accounted for 37.9% as of Aug. 31.

Nvidia, Apple and Microsoft had a combined weight of 20.28% in the S&P 500 in an Oct. 10, 2026 snapshot, while the benchmark’s 10 largest listed positions represented 39.03%.

Nvidia held the largest allocation at 7.78%, followed by Apple at 6.91% and Microsoft at 5.59%. Amazon ranked fourth at 3.98%.

The weights were calculated against total S&P 500 market capitalization of $71.12 trillion. The index uses float-adjusted market capitalization, giving companies with larger float-adjusted market values greater weight.

Rank
Company
Index weight

1
Nvidia
7.78%

2
Apple
6.91%

3
Microsoft
5.59%

4
Amazon
3.98%

5
Alphabet Class A
3.11%

6
Alphabet Class C
2.90%

7
Meta Platforms
2.57%

8
Broadcom
2.43%

9
Tesla
2.13%

10
Micron Technology
1.63%

Alphabet appeared twice because its Class A and Class C shares are two listed share classes of one company, not two separate companies.

The S&P 500 had 503 constituents as of Aug. 31, despite its name. The figures show that a small group of large companies represented a substantial share of the index.

Information Technology was the largest sector at 37.9% of the index as of Aug. 31. That sector figure predates the Oct. 10 ranking and is not directly comparable with the 39.03% total for the 10 largest listed positions, which includes companies outside the sector.