S&P 500
IndexS&P 500 sector weights: Technology 38.2% leads the index
Technology is the S&P 500's largest sector at 38.2% of the index; the top three sectors hold 60% between them (as of market close, Sep 4, 2026). Weights are each member's index weight estimated for today (the tracking fund's last SEC filing, rolled forward on price — see the full constituents list company by company) summed by GICS sector — so this is the real mix you own in an index fund, not an equal-count tally.
The mix at a glance#
Returns are total returns, weighted by index weight, at the 2026-09-04 close. P/E is the weighted harmonic mean; yield counts non-payers as zero.
Returns are total returns, weighted by index weight, at the 2026-09-04 close. P/E is the weighted harmonic mean; yield counts non-payers as zero.
Returns are total returns, weighted by index weight, at the 2026-09-04 close. P/E is the weighted harmonic mean; yield counts non-payers as zero.
Returns are total returns, weighted by index weight, at the 2026-09-04 close. P/E is the weighted harmonic mean; yield counts non-payers as zero.
Returns are total returns, weighted by index weight, at the 2026-09-04 close. P/E is the weighted harmonic mean; yield counts non-payers as zero.
Returns are total returns, weighted by index weight, at the 2026-09-04 close. P/E is the weighted harmonic mean; yield counts non-payers as zero.
Returns are total returns, weighted by index weight, at the 2026-09-04 close. P/E is the weighted harmonic mean; yield counts non-payers as zero.
Returns are total returns, weighted by index weight, at the 2026-09-04 close. P/E is the weighted harmonic mean; yield counts non-payers as zero.
Returns are total returns, weighted by index weight, at the 2026-09-04 close. P/E is the weighted harmonic mean; yield counts non-payers as zero.
Returns are total returns, weighted by index weight, at the 2026-09-04 close. P/E is the weighted harmonic mean; yield counts non-payers as zero.
Returns are total returns, weighted by index weight, at the 2026-09-04 close. P/E is the weighted harmonic mean; yield counts non-payers as zero.
Returns are total returns, weighted by index weight, at the 2026-09-04 close. P/E is the weighted harmonic mean; yield counts non-payers as zero.
Breakdown by sector#
YTD is the weight-weighted total return of the sector's members; example stocks are each sector's largest members (hover for their index weight). Explore the members of each sector in the screener.
Sector weights over time (2019–2026)#
Every quarterly SEC portfolio filing since 2019, stacked to 100%, plus today's estimate as the final segment — the index's drift toward Technology is the story of this chart.
Everything left of the dashed line is a filed weight on that date; the final segment is today's estimate — the 2026-06-30 filing rolled forward on each member's price — the same basis as the headline above.
Quarterly N-PORT snapshots; sector attribution uses today's classifications, so members that have since left the index (or our universe) appear as the gray "untracked" band — larger in older quarters (~9% in 2019) by construction.
FAQ#
- What is the biggest sector in the S&P 500?
- Technology, at about 38.2% of the index (74 companies). The top three sectors — Technology, Financials, Communication Services — together make up 60% of the index.
- How many sectors does the S&P 500 have?
- Eleven, under the GICS classification: Information Technology, Financials, Health Care, Consumer Discretionary, Communication Services, Industrials, Consumer Staples, Energy, Utilities, Real Estate, and Materials. Every member belongs to exactly one.
- Which sector is performing best in 2026?
- Energy leads year to date at +49.9% (weighted by index weight within the sector); Consumer Discretionary trails at +1.3%.
Notes & related#
Sector classifications are GICS (each company in exactly one sector); weights are from the tracking fund's N-PORT holdings rolled forward daily by price, summed per sector. Because weights are float-adjusted market-cap weighted, a sector's share reflects investable size, not company count — Technology has 74 members but 38.2% of the weight. Sector pages: tech stocks, energy stocks; the full member list with weights is on the constituents page. Not investment advice.
ChartRow is not affiliated with, sponsored by, or endorsed by S&P Dow Jones Indices LLC, S&P Global, or Nasdaq, Inc. "S&P 500®" and "Dow Jones®" are registered trademarks of S&P Dow Jones Indices LLC; "Nasdaq-100®" is a registered trademark of Nasdaq, Inc. They are used here only to identify the indexes discussed. All index-related figures on this page are independently derived from public sources — SEC filings, Robert Shiller's public dataset, and our own computations — not from any index provider's data feed.