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
Health Care Equipment1.51%-1.12 ppPharmaceuticals3.80%+0.22 ppBiotechnology1.68%-0.18 ppLife Sciences Tools & Services0.80%-0.12 ppHealth Care Distributors0.34%-0.09 ppManaged Health Care0.86%-0.08 ppHealth Care Services0.42%-0.07 ppHealth Care Facilities0.15%-0.06 ppHealth Care Technology0.07%+0.04 ppHealth Care Supplies0.08%-0.01 pp
3 · Sub-industry
Inside Health Care Distributors
Health Care Distributors · weight
0.34%
Industry change · 12M
-0.09 pp
Health Care Distributors · contribution
-0.094 pp
Company participation
25%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
May 2026 · 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 |
|---|---|---|---|---|---|---|---|
| McKesson Corporation → MCK | United States | $89.2bn | 0.155% | -0.011 pp | -0.049 pp | +3.6% | No |
| Cencora → COR | United States | $52.4bn | 0.091% | -0.009 pp | -0.037 pp | -6.8% | No |
| Henry Schein → HSIC | United States | $8.7bn | 0.015% | +0.002 pp | -0.004 pp | +9.4% | Yes |
| Cardinal Health → CAH | United States | $46.3bn | 0.080% | +0.006 pp | -0.003 pp | +28.9% | 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.