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
Universe›Industrials›Rail Transportation›Rail Transportation
Rail Transportation · weight
0.64%
Industry change · 12M
-0.13 pp
Rail Transportation · contribution
-0.134 pp
Company participation
100%
of industry constituents above their 6M weight average

4 · Companies driving this sub-industry

Sep 2024 · sorted by absolute contribution to 12-month change

CompanyCountryMarket capUniverse weight3M contribution12M contribution12M price returnAbove 6M weight average
Union Pacific Corporation →
UNP
United States$150.2bn0.350%+0.091 pp-0.065 pp+23.7%Yes
CSX Corporation →
CSX
United States$66.9bn0.156%+0.033 pp-0.050 pp+13.8%Yes
Norfolk Southern →
NSC
United States$56.2bn0.131%+0.040 pp-0.019 pp+29.3%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.