Products
- Kaiser Motors Corporation
- Kaiser-Frazer Corporation
- Kalamazoo, Allegan and Grand Rapids Railroad Company (Signed by Jeptha Wade)
- Kanawha & Michigan Railway Company
- Kanawha & Michigan Railway Company
- Kanawha Bridge and Terminal Company
- Kanawha Traction and Electric Company
- Kansas City and Topeka Railway Company
- Kansas City Northwestern Railroad Company
- Kansas City Railways Company
- Kansas City Southern Railway Company
- Kansas City Viaduct and Terminal Railway Company
- Kansas City, Beatrice and Western Railroad Company
- Kansas City, Burlington and Santa Fe Railway Company
- Kansas City, Fort Scott and Memphis Railway Company
- Kansas City, Lawrence & Southern Rail Road Company
- Kansas City, Mexico & Orient Railway Company
- Kansas City, Mexico & Orient Railway Company
- Kansas City, Mexico & Orient Railway Company
- Kansas City, St. Louis and Chicago Railroad Company
- Kansas, Oklahoma Central and Southwestern Railway Company
- Kay Copper Corporation
- Kaye-Halbert Corporation
- KCS Energy, Inc.
- Keaton Tire and Rubber Co. (California)
- Kelly-Springfield Tire Company
- Kelwin Film Corporation
- Kendall Company
- Kendall Company
- Kennecott Copper Corporation (Alaska)
- Kenton Iron and Steel Company
- Kentucky and South Atlantic Railway Company
- Kentucky Western Railway Co.
- Kerr-McGee Corporation
- Kerr-McGee Oil Industries, Inc.
- Key System Transit Company
- Key System Transit Company
- Keystone Foundry Company
- Keystone Tire and Rubber Company
- Keystone Wagon Works
- Keystone Wagon Works
- Keystone-Holy Terror Mining Company
- Keywest Mining Company
- Kill-von-Kull Railway Company
- Kinemacolor Company of America
- Kinetophote Corporation
- King Bros. Productions, Inc.
- King David Mining Company
- King Edward Silver Mines
- King of Pine Creek Mining Company, Limited
- King's Department Stores, Inc.
- Kings County Elevated Railroad Company
- Kinner Airplane and Motor Corporation, Ltd.
- Kinney Steamship Company
- Kirby Furnace Smelting and Refining Company
- Kirby Lumber Company (Texas)
- Knox Divide Mining Company
- Knox Tire & Rubber Company
- Knoxville & Ohio Railroad Company
- Kokomo, Marion and Western Traction Company
- Kokomo, Marion and Western Traction Company
- Kolster Radio Corporation
- Kolster Radio Corporation
- Kolster Radio Corporation
- Kolster Radio Corporation (Issued to Rudolph Spreckels)
- Kona and Kau Railway (Hawaii)
- Kootenay Gold Exploration Company, Limited
- Kreuger & Toll Company (Famous Pyramid Scheme)
- Kropp Forge Company (Issued to Raymond Kropp)
- Krus Engraving Company
- L. B. Patent Shoe Company
- La Dicha & Pacific Railroad Company
- La Zacualpa-Hidalgo Rubber Company
- Labor Film Service, Inc. (Socialist Movie Company)
- Lackawanna Coal and Lumber Company
- Lackawanna Coal and Lumber Company
- Lackawanna Railroad Company of New Jersey
- Lackawanna Steel Company
- Laclede Gas Light Company
- Laclede Gas Light Company
- Laclede Gas Light Company
- LaFrance-Republic Corporation
- Lake Copper Company (Signed by William A. Paine of Paine Webber Fame)
- Lake Erie, Franklin & Clarion Railroad Company
- Lake Erie, Youngstown & Southern Railroad Company
- Lake Morey Telephone and Telegraph Co.
- Lake Ontario Shore Rail Road Co. (Town of Wolcott, New York)
- Lake Ontario, Auburn & New-York Rail-Road Company
- Lake Shore and Michigan Southern Railway Company
- Lake Shore and Michigan Southern Railway Company
- Lake Shore and Michigan Southern Railway Company
- Lake Shore and Michigan Southern Railway Company
- Lake Shore Railway Company
- Lake Steamship Company
- Lake Superior Iron & Chemical Co.
- Lakewood Country Club of Lakewood, Chautauqua Co., New York
- Lancaster County Baseball Corporation
- Lancaster County, Nebraska (Midland Pacific Railway)
- Lane Drug Stores, Inc.
- LANTZ Sliced Cheese Corporation