XLB (US-"Materials Sector")
The Materials Select Sector SPDR ETF tracks a market-cap-weighted index of US basic materials companies. The fund includes only the materials components of the S&P 500. This Index is primarily composed of companies involved in such industries as chemicals,...
...construction materials, containers and packaging, metals and mining, and paper and forest products. Among its largest components are DowDuPont, Monsanto, Praxair and Ecolab (as per 2nd Jan. 2018).
The Estimate Weight of XLB Components in the S&P 500 as of 29th December 2017 was ca. 3 %.