Products
- Woodruff Sleeping and Parlor Coach Company (Signed by Daniel Chase Corbin)
- Woodward Iron Company
- Woolworth Corporation
- Worcester and Suburban Street Railway Company
- Worcester Consolidated Street Railway Company
- WorldCom, Inc.
- Wrigley Pharmaceutical Co. (Signed by W. W. Wrigley)
- Wrigley Pharmaceutical Company (Signed by W. W. Wrigley)
- Wrigley Tooth Paste Co., Limited (Signed by W. W. Wrigley)
- WTC Air Freight
- Wyandotte & Detroit River Railway
- Xerox Corporation
- Xerox Corporation
- XPrize (Charles Lindbergh, Spirit of St. Louis)
- Yale Express System, Inc.
- Yates Avenue and Flatbush Railroad Company
- Yates Avenue and Flatbush Railroad Company
- Yates-American Machine Company
- Yazoo and Mississippi Valley Railroad Company
- Yazoo and Mississippi Valley Railroad Company
- Yellow Freight System, Inc. of Delaware
- Yellow Gold of Cripple Creek, Inc.
- Yellow Taxi Company (Detroit)
- Yonkers, New York
- Yonkers, New York
- York Railways Company
- York Transit Company
- York Transit Company (Signed by John J. Boland)
- Yosemite Short Line Railway Company
- Youngstown Steel Door Company
- Yuba Construction Company
- Yuba Manufacturing Company
- Yukon Basin Gold Dredging Company, Ltd. (Signed by William Ogilvie)
- Zanesville Terminal Railroad Company
- Zarie Almesan Manufacturing Corporation (Shock Absorbers)
- Zarol Medical Research, Incorporated (Diabetic Wine)
- Zayre Corp.
- Zenith City Telephone Company
- Zenith Laboratories, Inc.