The S&P 500, by weight

Every company in the index, stacked by its share of it, largest on top, from 1995 to June 2026. In 1995 the twenty largest made up 27.6% of the index. Now they make up 48.4%, and only five of the first twenty are still among them.

The chart

In the top 20 in 1995 and now
In 1995, not now
Now, not in 1995
Only in between
Never in the top 20
Where the top 20 end

Find a company

A band’s thickness is the company’s share of the index, and its place in the stack is its rank. Point at a band to read it, and click to keep it lit.

The top 20 on 30 Jun 2026

The chart and the list need JavaScript. Without it: on 30 June 2026 the five largest companies were Nvidia (7.52%), Apple (6.59%), Alphabet, Microsoft (4.30%) and Amazon (3.62%). On 31 December 1995 they were General Electric (2.62%), AT&T (2.25%), Exxon (2.17%), Coca-Cola (2.03%) and Merck.

Where the numbers come from

S&P does not publish the index’s past weights for free. The SPDR S&P 500 ETF Trust, a fund that holds the index’s companies at the index’s weights, reports its holdings to the SEC. Each company’s share of the fund’s stock is its share of the index to within a few hundredths of a point.

The chart uses all 62 reports the fund has filed: one a year from 1995 to 2009, two a year from 2010 to 2019 and four a year since. The early years have fewer points, and nothing between reports is estimated. A crash and recovery that fit between two reports do not show.

The reports name companies without ticker symbols, so 1,409 names are matched by hand and by rule. A renamed company is one band: Facebook, then Meta. After a merger the band continues from the larger partner: SBC, then AT&T. Share classes are added together. Some renames of small companies are missed, and show as one company leaving and another arriving.

Source: SPDR S&P 500 ETF Trust filings on SEC EDGAR, forms N-30D and NPORT-P.