Observatory · observe first
Follow the allocation change
Matched S&P 500 members → sector → industry → sub-industry → company. Each step uses the same percentage points.
Historical time machine
Historical observation
20182026
1 · Sector
Weight and 12M allocation change
2 · Industry
Inside Health Care
Pharmaceuticals2.94%-2.47 ppHealth Care Equipment1.97%-1.40 ppBiotechnology1.37%-1.01 ppManaged Health Care1.14%-0.81 ppLife Sciences Tools & Services1.26%-0.50 ppHealth Care Services0.53%-0.46 ppHealth Care Distributors0.18%-0.16 ppHealth Care Facilities0.13%-0.10 ppHealth Care Supplies0.16%+0.04 ppHealth Care Technology0.00%+0.00 pp
3 · Sub-industry
Inside Health Care Services
Health Care Services · weight
0.53%
Industry change · 12M
-0.46 pp
Health Care Services · contribution
-0.455 pp
Company participation
80%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jan 2021 · sorted by absolute contribution to 12-month change
| Company | Country | Market cap | Universe weight | 3M contribution | 12M contribution | 12M price return | Above 6M weight average |
|---|---|---|---|---|---|---|---|
| CVS Health → CVS | United States | $93.8bn | 0.225% | -0.123 pp | -0.211 pp | +9.0% | Yes |
| Cigna → CI | United States | $78.4bn | 0.188% | -0.102 pp | -0.167 pp | +12.8% | Yes |
| Quest Diagnostics → DGX | United States | $17.4bn | 0.042% | -0.036 pp | -0.032 pp | +19.3% | No |
| Labcorp → LH | United States | $19.2bn | 0.046% | -0.033 pp | -0.026 pp | +30.5% | Yes |
| DaVita → DVA | United States | $13.1bn | 0.031% | -0.014 pp | -0.020 pp | +47.0% | Yes |
Company contributions use weights among matched S&P 500 members and add through each level without rescaling. Companies without matched shares and prices are omitted. These observations do not establish official index weights or actual fund flows.