Yoh Family Office Overview

General Information

Yoh Family Office is a single-family office headquartered in Philadelphia, United States. Established in 1998, it stewards the wealth generated by the Yoh family’s full ownership of Day & Zimmermann, the multibillion-dollar construction, engineering, staffing and defense group founded in 1901. The office allocates capital across public equities, private businesses, real assets and impact ventures, manages intergenerational estate planning, and oversees philanthropic commitments—advancing disciplined, values-based growth.