Observatory · observe first
IBM
IBM · United States · IT Consulting & Other Services · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Historical observation
20182026
Universe weight
0.485%
12M weight contribution
-0.061 pp
3M weight contribution
+0.176 pp
12M price return
+17.9%
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 | $279.9bn | 0.485% | -0.061 pp | +17.9% | Yes |
| Apr 2026 | $217.1bn | 0.295% | -0.245 pp | -2.1% | No |
| Mar 2026 | $227.4bn | 0.331% | -0.216 pp | -0.1% | No |
| Feb 2026 | $225.3bn | 0.309% | -0.214 pp | -2.5% | No |
| Jan 2026 | $286.7bn | 0.548% | +0.023 pp | +23.0% | Yes |
| Dec 2025 | $276.9bn | 0.542% | +0.081 pp | +38.2% | Yes |
| Nov 2025 | $288.4bn | 0.567% | +0.103 pp | +39.2% | Yes |
| Oct 2025 | $287.3bn | 0.563% | +0.114 pp | +52.9% | Yes |
| Sep 2025 | $262.8bn | 0.526% | +0.052 pp | +31.2% | No |
| Aug 2025 | $226.8bn | 0.470% | +0.020 pp | +23.9% | No |
| Jul 2025 | $235.8bn | 0.497% | +0.180 pp | +35.7% | No |
| Jun 2025 | $274.0bn | 0.591% | +0.293 pp | +75.6% | Yes |
| May 2025 | $240.8bn | 0.546% | +0.253 pp | +60.0% | Yes |
| Apr 2025 | $224.7bn | 0.540% | +0.097 pp | +50.4% | Yes |
| Mar 2025 | $230.6bn | 0.547% | +0.062 pp | +34.6% | Yes |
| Feb 2025 | $234.1bn | 0.523% | +0.037 pp | +41.0% | Yes |
| Jan 2025 | $236.4bn | 0.526% | +0.027 pp | +44.3% | Yes |
| Dec 2024 | $203.3bn | 0.461% | +0.016 pp | +39.3% | Yes |
| Nov 2024 | $210.3bn | 0.464% | +0.013 pp | +48.6% | Yes |
| Oct 2024 | $191.1bn | 0.449% | +0.000 pp | +48.6% | Yes |
| Sep 2024 | $203.6bn | 0.474% | +0.047 pp | +63.8% | Yes |
| Aug 2024 | $186.2bn | 0.450% | +0.024 pp | +43.1% | Yes |
| Jul 2024 | $177.0bn | 0.317% | +0.031 pp | +38.9% | No |
| Jun 2024 | $158.9bn | 0.298% | +0.017 pp | +34.8% | 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.