- Yancey Bros. Co.
- Yancy Bros. Company
- Yellow Corp.
- Young & Rubicam
- Yum! Brands Foundation
- Yum! Brands, Inc.
- ZC Resource, LLC
- Zero-Max
- Zero-Max, Inc.
- Zevenberger Capital
- Ziff Brothers Investments
- Ziff-Davis Publishing Company
- Zinpro Corporation
- Zunich
- Zurich Kemper Investments
- Zurich Life
- Zurich Reinsurance Centre, Inc.
- Zurich, in North America
- Zurich-American Foundation
- ZymoGenetics Inc.