Observatory · observe first
S&P Global
SPGI · United States · Financial Exchanges & Data · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Latest available · not live
20182026
Universe weight
0.196%
12M weight contribution
-0.085 pp
3M weight contribution
-0.002 pp
12M price return
-13.6%
Share of matched S&P 500 members
Monthly observations through Sep 2026
Company price index
A separate dimension from market allocation
Historical observations
Most recent 24 observations at or before the selected month
| Month | Market cap | Universe weight | 12M weight change | 12M return | Above 6M weight average |
|---|---|---|---|---|---|
| Sep 2026 | $116.8bn | 0.196% | -0.085 pp | -13.6% | No |
| Aug 2026 | $129.0bn | 0.215% | -0.114 pp | -15.3% | Yes |
| Jul 2026 | $121.9bn | 0.213% | -0.124 pp | -20.3% | Yes |
| Jun 2026 | $114.0bn | 0.198% | -0.132 pp | -22.1% | No |
| May 2026 | $118.7bn | 0.206% | -0.131 pp | -16.6% | No |
| Apr 2026 | $120.8bn | 0.164% | -0.185 pp | -13.1% | No |
| Mar 2026 | $120.2bn | 0.175% | -0.179 pp | -15.6% | No |
| Feb 2026 | $124.9bn | 0.171% | -0.179 pp | -16.6% | No |
| Jan 2026 | $151.2bn | 0.289% | -0.051 pp | +2.0% | No |
| Dec 2025 | $149.7bn | 0.293% | -0.038 pp | +5.7% | No |
| Nov 2025 | $142.9bn | 0.281% | -0.058 pp | -3.8% | No |
| Oct 2025 | $139.6bn | 0.273% | -0.058 pp | +2.2% | No |
| Sep 2025 | $140.6bn | 0.281% | -0.075 pp | -5.1% | No |
| Aug 2025 | $158.4bn | 0.328% | -0.039 pp | +7.6% | No |
| Jul 2025 | $159.9bn | 0.337% | +0.080 pp | +14.5% | No |
| Jun 2025 | $153.0bn | 0.330% | +0.082 pp | +19.1% | No |
| May 2025 | $148.8bn | 0.337% | +0.095 pp | +20.8% | No |
| Apr 2025 | $145.1bn | 0.348% | -0.008 pp | +21.2% | Yes |
| Mar 2025 | $149.2bn | 0.354% | +0.004 pp | +20.3% | Yes |
| Feb 2025 | $156.7bn | 0.350% | -0.014 pp | +25.5% | Yes |
| Jan 2025 | $153.1bn | 0.340% | -0.059 pp | +17.2% | No |
| Dec 2024 | $146.2bn | 0.332% | -0.062 pp | +13.9% | Yes |
| Nov 2024 | $153.4bn | 0.338% | -0.050 pp | +26.6% | Yes |
| Oct 2024 | $141.0bn | 0.331% | -0.026 pp | +38.6% | Yes |
Its weight is estimated market cap divided by the total estimated market cap of matched S&P 500 members for the month. This is not an official float-adjusted S&P index weight.