Single Family OfficeInvests through funds, not into companiesLAST VERIFIED Jun 2026 · 1 SOURCES
Day & Zimmermann
Single family office in Philadelphia, United States, founded 1901; focus on climate, industrial and real estate.
Family & background
- HEADQUARTERS
- Philadelphia, United States
- FOUNDED
- 1901
Investment approach
Overview
Headquartered in Philadelphia, United States, the firm is listed as a single family office founded in 1901. Sectors on record are climate, industrial, real estate and software. 1 person is named on its team.
People
- Harold L. Yoh, IIIChairman and CEO · source
Frequently asked questions
Day & Zimmermann is a single family office based in Philadelphia, the United States, founded in 1901.
Day & Zimmermann does not publicly state whether it puts its own money into companies or invests through funds.
Day & Zimmermann invests in Climate & Energy, Industrial & Manufacturing, Real Estate & PropTech and Software & SaaS.
Key people at Day & Zimmermann include Harold L. Yoh, III (Chairman and CEO).