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
Managed Health Care0.84%-0.75 ppPharmaceuticals3.52%-0.71 ppBiotechnology1.80%-0.33 ppHealth Care Equipment2.20%-0.32 ppLife Sciences Tools & Services1.00%-0.24 ppHealth Care Distributors0.43%+0.09 ppHealth Care Services0.42%-0.07 ppHealth Care Supplies0.09%-0.05 ppHealth Care Facilities0.21%-0.01 ppHealth Care Technology0.02%-0.01 pp
3 · Sub-industry
Inside Health Care Services
Health Care Services · weight
0.42%
Industry change · 12M
-0.07 pp
Health Care Services · contribution
-0.067 pp
Company participation
20%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Oct 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 | $65.3bn | 0.128% | -0.023 pp | -0.078 pp | -20.9% | No |
| CVS Health → CVS | United States | $99.2bn | 0.194% | +0.028 pp | +0.027 pp | +44.3% | Yes |
| DaVita → DVA | United States | $8.4bn | 0.016% | -0.006 pp | -0.010 pp | -14.9% | No |
| Labcorp → LH | United States | $21.1bn | 0.041% | -0.005 pp | -0.004 pp | +12.5% | No |
| Quest Diagnostics → DGX | United States | $19.6bn | 0.038% | -0.001 pp | -0.002 pp | +15.8% | 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.