Supelco/Sigma-Aldrich group is your trusted resource for analytical and chromatography products.
http://www.sigmaaldrich.com

Production and Sales of Packing Materials and Packed Columns for High Performance Liquid Chromatography(HPLC), Custom purification and Custom synthesis.
http://www.ymc.com.jp

Varian offers a very diversed chromatography products.
http://www.varianinc.com