Observatory · observe first
Merck & Co.
MRK · United States · Pharmaceuticals · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Historical observation
20182026
Universe weight
0.420%
12M weight contribution
-0.101 pp
3M weight contribution
-0.091 pp
12M price return
+39.3%
Share of matched S&P 500 members
Monthly observations through Feb 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 |
|---|---|---|---|---|---|
| Feb 2026 | $306.1bn | 0.420% | -0.101 pp | +39.3% | No |
| Jan 2026 | $273.7bn | 0.524% | -0.032 pp | +15.8% | Yes |
| Dec 2025 | $261.3bn | 0.512% | -0.059 pp | +9.8% | Yes |
| Nov 2025 | $260.2bn | 0.511% | -0.056 pp | +7.0% | Yes |
| Oct 2025 | $214.8bn | 0.421% | -0.189 pp | -12.9% | No |
| Sep 2025 | $209.6bn | 0.420% | -0.250 pp | -23.4% | No |
| Aug 2025 | $210.1bn | 0.436% | -0.290 pp | -26.6% | No |
| Jul 2025 | $196.2bn | 0.414% | -0.100 pp | -28.6% | No |
| Jun 2025 | $198.8bn | 0.429% | -0.159 pp | -33.9% | No |
| May 2025 | $192.9bn | 0.437% | -0.171 pp | -37.0% | No |
| Apr 2025 | $215.2bn | 0.517% | -0.431 pp | -32.1% | No |
| Mar 2025 | $226.7bn | 0.538% | -0.388 pp | -30.0% | No |
| Feb 2025 | $233.0bn | 0.521% | -0.402 pp | -25.5% | No |
| Jan 2025 | $250.0bn | 0.556% | -0.354 pp | -15.9% | No |
| Dec 2024 | $251.6bn | 0.571% | -0.253 pp | -6.3% | No |
| Nov 2024 | $257.1bn | 0.567% | -0.242 pp | +1.8% | No |
| Oct 2024 | $259.4bn | 0.610% | -0.276 pp | +2.3% | No |
| Sep 2024 | $287.9bn | 0.670% | -0.202 pp | +13.2% | No |
| Aug 2024 | $300.2bn | 0.725% | -0.156 pp | +11.6% | Yes |
| Jul 2024 | $286.5bn | 0.514% | -0.076 pp | +8.9% | No |
| Jun 2024 | $313.6bn | 0.588% | -0.089 pp | +10.1% | No |
| May 2024 | $318.0bn | 0.608% | -0.084 pp | +16.8% | No |
| Apr 2024 | $327.3bn | 0.948% | -0.042 pp | +15.0% | Yes |
| Mar 2024 | $334.2bn | 0.927% | +0.005 pp | +27.4% | 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.