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
0.76%
Industry change · 12M
-0.01 pp
Rail Transportation · contribution
-0.012 pp
Company participation
0%
of industry constituents above their 6M weight average

4 · Companies driving this sub-industry

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

CompanyCountryMarket capUniverse weight3M contribution12M contribution12M price returnAbove 6M weight average
CSX Corporation →
CSX
United States$64.9bn0.188%-0.022 pp-0.022 pp+9.9%No
Union Pacific Corporation →
UNP
United States$144.7bn0.419%-0.023 pp+0.016 pp+24.0%No
Norfolk Southern →
NSC
United States$52.0bn0.151%-0.007 pp-0.005 pp+16.4%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.