Observatory · observe first
Union Pacific Corporation
UNP · United States · Rail Transportation · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Latest available · not live
20182026
Universe weight
0.272%
12M weight contribution
-0.009 pp
3M weight contribution
-0.009 pp
12M price return
+17.6%
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 | $161.7bn | 0.272% | -0.009 pp | +17.6% | No |
| Aug 2026 | $178.6bn | 0.297% | +0.023 pp | +37.3% | Yes |
| Jul 2026 | $173.5bn | 0.303% | +0.025 pp | +34.6% | Yes |
| Jun 2026 | $161.5bn | 0.281% | -0.016 pp | +20.9% | Yes |
| May 2026 | $155.9bn | 0.270% | -0.030 pp | +21.2% | Yes |
| Apr 2026 | $160.0bn | 0.217% | -0.092 pp | +27.9% | No |
| Mar 2026 | $144.0bn | 0.210% | -0.129 pp | +5.1% | No |
| Feb 2026 | $157.2bn | 0.216% | -0.118 pp | +9.9% | No |
| Jan 2026 | $139.5bn | 0.267% | -0.067 pp | -2.9% | No |
| Dec 2025 | $137.2bn | 0.269% | -0.045 pp | +3.9% | No |
| Nov 2025 | $137.5bn | 0.270% | -0.057 pp | -3.0% | No |
| Oct 2025 | $130.7bn | 0.256% | -0.075 pp | -2.8% | No |
| Sep 2025 | $140.2bn | 0.281% | -0.069 pp | -1.8% | No |
| Aug 2025 | $132.6bn | 0.275% | -0.102 pp | -10.6% | No |
| Jul 2025 | $131.6bn | 0.278% | +0.008 pp | -8.0% | No |
| Jun 2025 | $137.5bn | 0.296% | +0.038 pp | +4.0% | No |
| May 2025 | $132.4bn | 0.300% | +0.029 pp | -2.6% | No |
| Apr 2025 | $128.9bn | 0.309% | -0.110 pp | -7.0% | No |
| Mar 2025 | $142.8bn | 0.339% | -0.077 pp | -1.8% | Yes |
| Feb 2025 | $149.1bn | 0.333% | -0.110 pp | -0.6% | Yes |
| Jan 2025 | $150.2bn | 0.334% | -0.108 pp | +3.8% | No |
| Dec 2024 | $138.3bn | 0.313% | -0.133 pp | -5.1% | No |
| Nov 2024 | $148.3bn | 0.327% | -0.101 pp | +11.0% | Yes |
| Oct 2024 | $140.7bn | 0.331% | -0.100 pp | +14.2% | 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.