Observatory · observe first
BlackRock
BLK · United States · Asset Management & Custody Banks · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Historical observation
20182026
Universe weight
0.332%
12M weight contribution
-0.039 pp
3M weight contribution
+0.003 pp
12M price return
+6.2%
Share of matched S&P 500 members
Monthly observations through Jan 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 |
|---|---|---|---|---|---|
| Jan 2026 | $173.4bn | 0.332% | -0.039 pp | +6.2% | No |
| Dec 2025 | $165.8bn | 0.325% | -0.035 pp | +6.6% | No |
| Nov 2025 | $162.3bn | 0.319% | -0.031 pp | +4.5% | No |
| Oct 2025 | $167.8bn | 0.329% | +0.329 pp | +12.6% | No |
| Sep 2025 | $180.6bn | 0.362% | +0.362 pp | +25.3% | Yes |
| Aug 2025 | $174.6bn | 0.362% | +0.362 pp | +27.7% | Yes |
| Jul 2025 | $171.3bn | 0.361% | +0.361 pp | +28.9% | Yes |
| Jun 2025 | $162.6bn | 0.351% | +0.351 pp | +36.2% | Yes |
| May 2025 | $151.8bn | 0.344% | +0.344 pp | +29.9% | No |
| Apr 2025 | $141.9bn | 0.341% | +0.341 pp | +24.0% | No |
| Mar 2025 | $146.9bn | 0.349% | +0.349 pp | +16.2% | Yes |
| Feb 2025 | $151.8bn | 0.339% | +0.339 pp | +23.4% | Yes |
| Jan 2025 | $166.6bn | 0.370% | +0.370 pp | +42.2% | Yes |
| Dec 2024 | $158.8bn | 0.360% | +0.360 pp | +29.3% | Yes |
| Nov 2024 | $158.4bn | 0.350% | +0.350 pp | +39.6% | 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.