Observatory · observe first
Berkshire Hathaway
BRK.B · United States · Multi-Sector Holdings · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Historical observation
20182026
Universe weight
0.001%
12M weight contribution
-0.000 pp
3M weight contribution
+0.000 pp
12M price return
-5.8%
Share of matched S&P 500 members
Monthly observations through May 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 |
|---|---|---|---|---|---|
| May 2026 | $0.4bn | 0.001% | -0.000 pp | -5.8% | Yes |
| Apr 2026 | $0.4bn | 0.001% | -0.001 pp | -11.2% | No |
| Mar 2026 | $0.5bn | 0.001% | -0.001 pp | -10.0% | No |
| Feb 2026 | $0.5bn | 0.001% | -0.000 pp | -1.7% | No |
| Jan 2026 | $0.5bn | 0.001% | -0.000 pp | +2.5% | No |
| Dec 2025 | $0.5bn | 0.001% | -0.000 pp | +10.9% | No |
| Nov 2025 | $0.5bn | 0.001% | -0.000 pp | +6.4% | Yes |
| Oct 2025 | $0.4bn | 0.001% | -0.000 pp | +5.9% | No |
| Sep 2025 | $0.5bn | 0.001% | -0.000 pp | +9.2% | No |
| Aug 2025 | $0.5bn | 0.001% | -0.000 pp | +5.7% | No |
| Jul 2025 | $0.4bn | 0.001% | +0.000 pp | +7.6% | No |
| Jun 2025 | $0.5bn | 0.001% | +0.000 pp | +19.4% | No |
| May 2025 | $0.5bn | 0.001% | +0.000 pp | +21.6% | No |
| Apr 2025 | $0.5bn | 0.001% | +0.000 pp | +34.4% | Yes |
| Mar 2025 | $0.5bn | 0.001% | +0.000 pp | +26.6% | Yes |
| Feb 2025 | $0.5bn | 0.001% | -0.000 pp | +25.5% | Yes |
| Jan 2025 | $0.4bn | 0.001% | -0.000 pp | +22.1% | No |
| Dec 2024 | $0.4bn | 0.001% | -0.000 pp | +27.1% | Yes |
| Nov 2024 | $0.5bn | 0.001% | -0.000 pp | +34.2% | Yes |
| Oct 2024 | $0.4bn | 0.001% | -0.000 pp | +32.1% | Yes |
| Sep 2024 | $0.4bn | 0.001% | -0.000 pp | +31.4% | Yes |
| Aug 2024 | $0.4bn | 0.001% | +0.000 pp | +32.1% | Yes |
| Jul 2024 | $0.4bn | 0.001% | +0.000 pp | +24.6% | No |
| Jun 2024 | $0.4bn | 0.001% | -0.000 pp | +19.3% | No |
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.