Products
- Union Passenger Railway Company of Philadelphia (Signed by Peter AB Widener)
- Union Street Railroad Company
- Union Tank Car Company
- Union Traction Company of Philadelphia
- Union Trust Company
- Unionamerica, Inc.
- Unique Theatre Company of Boston
- United 5 & 10 Cent Stores
- United Air Lines, Inc.
- United Artists Theatre Circuit, Inc.
- United Auto Stores Incorporated
- United Cigar Stores Company of America
- United Cigar-Whelan Stores Corporation
- United Corporation
- United Drug, Inc.
- United Fruit Company (Chiquita)
- United Milk Company
- United Mines of Arizona
- United Motors Company
- United New Jersey Rail Road and Canal Company
- United New Jersey Railroad and Canal Company
- United New Jersey Railroad and Canal Company
- United New Jersey Railroad and Canal Company
- United New Jersey Railroad and Canal Company
- United New Jersey Railroad and Canal Company
- United New Jersey Railroad and Canal Company
- United Park City Mines Company
- United Printers and Publishers Incorporated
- United Public Utilities Corporation
- United Railroads of San Francisco
- United Railroads of San Francisco
- United Railways & Electric Company of Baltimore
- United Railways Company (Oregon)
- United Railways Company (Oregon)
- United Railways Company (Oregon)
- United Reproducers Corporation (Radios)
- United Retail Stores Corporation
- United Rico Mines Company
- United Rico Mines Company (Issued to David H. Moffat)
- United Rico Mines Company (Signed by David H. Moffatt)
- United Shoe Machinery Corporation
- United Smelters Railway and Copper Company
- United States Automotive Corporation (Lexington)
- United States Banknote Corporation
- United States Banknote Corporation
- United States Car Company
- United States Ceramic Tile Company
- United States Electric Power Corporation
- United States Freight Company
- United States Gypsum Company
- United States Independent Telephone Company
- United States Independent Telephone Company
- United States Lines Company
- United States Lines, Inc.
- United States Motor Company
- United States Moving Pictures Corporation
- United States Pipe and Foundry Company
- United States Plywood Corporation
- United States Pneumatic Horse Collar Co.
- United States Ship Corporation
- United States Silver Fox Farms, Consolidated
- United States Steamship Company
- United States Steamship Company
- United States Steamship Company
- United States Steamship Company
- United States Steel Corporation
- United States Steel Corporation
- United States Steel Corporation (Issued to Andrew Carnegie)
- United States Television Manufacturing Corporation
- United States Treasury (Al Capp Characters)
- United States Treasury (Disney Characters)
- United States Treasury (Disney Characters)
- United States Whip Company
- United States Worsted Corporation
- United Steel Works Corporation
- United Stores Association
- United Stores Corporation
- United Technologies Corporation
- United Traction Company
- United Traction Company (Albany, NY)
- United Transit Company (Rhode Island)
- United Transit Company (Rhode Island, Certificate #1)
- United Transportation Co., Inc. of Troy, New York
- United Verde Extension Mining Company
- United Whelan Corporation
- Universal Aerial Navigation Co.
- Universal Aero-Transportation Company
- Universal Airlines Company
- Universal American Corporation
- Universal Match Corporation
- Universal Pictures Company, Inc.
- University Computing Company
- University Schools of Correspondence
- UOP, Inc. (Universal Oil Products)
- Urban Motion Picture Industries, Inc. (Signed by Charles Urban)
- Urban Motion Picture Industries, Inc. (Signed by Charles Urban)
- Uris Buildings Corporation
- Uris Buildings Corporation
- URT Industries, Inc. (Peaches Record Stores)
- USAir Group, Inc.