Murata
Home page: http://www.murata.com
Harris Suppression Products Group
(now a business unit of Littelfuse, Inc.)
Home page: http://www.littelfuse.com/products/tvs-diodes.aspx
TDK
Home page: http://www.tdk.com
EMC components:
https://product.tdk.com/info/en/products/emc/catalog.html