Day & Zimmermann
| Company type | Private |
|---|---|
| Industry | Construction, staffing, defense |
| Headquarters | Philadelphia, Pennsylvania , United States |
Area served | Worldwide |
Key people | Harold L. Yoh III (Chairman & CEO) |
| Revenue | US$2.7 billion (2023) |
| Owners | Hal, Mike and Bill Yoh |
Number of employees | 43,000 |
| Subsidiaries | Yoh Services |
| Website | dayzim |
Day & Zimmermann is a privately held company in the fields of construction, engineering, staffing and ammunition manufacture, operating out of 150 locations worldwide. Its corporate office is in Philadelphia, Pennsylvania.
Day & Zimmermann has an annual revenue of $2.5 billion, and is ranked by Forbes as one of the largest privately held companies in the United States. One of America's leading producers of ammunition, the company operates several government-owned facilities. In the 2011 financial year, it worked on 351 US Army contracts worth 151.8 million dollars.