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
Pharmaceuticals3.39%-1.02 ppManaged Health Care0.87%-0.85 ppLife Sciences Tools & Services0.91%-0.49 ppBiotechnology1.80%-0.32 ppHealth Care Equipment2.26%-0.27 ppHealth Care Services0.45%-0.07 ppHealth Care Distributors0.40%+0.07 ppHealth Care Supplies0.08%-0.06 ppHealth Care Facilities0.20%-0.04 ppHealth Care Technology0.03%-0.00 pp
3 · Sub-industry
Inside Health Care Services
Health Care Services · weight
0.45%
Industry change · 12M
-0.07 pp
Health Care Services · contribution
-0.071 pp
Company participation
40%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Sep 2025 · 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 |
|---|---|---|---|---|---|---|---|
| Cigna → CI | United States | $76.9bn | 0.154% | -0.036 pp | -0.071 pp | -15.2% | No |
| DaVita → DVA | United States | $9.5bn | 0.019% | -0.004 pp | -0.013 pp | -18.9% | No |
| CVS Health → CVS | United States | $95.6bn | 0.191% | +0.003 pp | +0.007 pp | +25.4% | Yes |
| Labcorp → LH | United States | $23.9bn | 0.048% | +0.000 pp | +0.004 pp | +29.9% | Yes |
| Quest Diagnostics → DGX | United States | $21.3bn | 0.043% | -0.001 pp | +0.002 pp | +25.1% | No |
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.