Every fact below links to its source. Informational only. Ownership statements are limited to primary announcements and filings.
- Headquarters
- Philadelphia, Pa., as listed by ENR in the 2026 Top 500 Design FirmsSource: enr.com/toplists/2026-top-500-design-fi…
- Ownership type
- Family-owned, as described on the firm's own websiteSource: dayzim.com/about
- Employees
- The firm states it has 32,000 employees, per the firm's siteSource: dayzim.com/about
- Website
- dayzim.comSource: dayzim.com
Legal name, DBA and former names
- The firm is named Day & Zimmermann.Source: dayzim.com/about
Identifiers (UEI, state registrations)
- SAM UEI JV1NFDGGB4S4 (as shown on the USAspending recipient record) and Texas TBPELS firm no. 4236.Source: usaspending.gov/recipient/871d3c2e-a65c-bb19-06…
Ownership type
- Family-owned, as described on the firm's own website.Source: dayzim.com/about
Employee count or band
- The firm states it has 32,000 employees, per the firm's site.Source: dayzim.com/about
Services and markets
- The firm provides construction and engineering, operations and maintenance, staffing, security, and defense services to corporations and governments.Source: dayzim.com
Leaders
- Harold Yoh, III, Chair and CEO.Source: dayzim.com/about/leadership
- Kathleen King, Senior VP Finance and CFO.Source: dayzim.com/about/leadership
- Lisa Ann Cooney, SVP, Chief Legal Officer and Corporate Secretary.Source: dayzim.com/about/leadership
- Sankara 'Vishi' Viswanathan, Senior VP and CIO.Source: dayzim.com/about/leadership
Licences (board records)
- Texas TBPELS roster lists DAY & ZIMMERMANN INTERNATIONAL INC (firm no. 4236, type NS, expires 2028-01-31)Source: tbpedownloads.s3-us-west-2.amazonaws.com/roster_firm.zip
Federal awards (contracts)
- USAspending recipient record THE DAY & ZIMMERMANN GROUP, INC (Philadelphia, PA), contract award obligations: FY2021 $270,994,279, FY2022 $247,557,043, FY2023 $555,147,017, FY2024 $206,066,647, FY2025 -$94,909,483 (net reduction from modifications) (award types A to D; obligations as published, including modifications and negative adjustments)Source: usaspending.gov/recipient/871d3c2e-a65c-bb19-06…
This line reflects one USAspending recipient record for one legal entity and does not describe all federal work by the firm or its affiliates.
Rankings and awards
- Listed in the ENR 2026 Top 500 Design Firms.Source: enr.com/toplists/2026-top-500-design-fi…
News timeline
- 2026-09-29: Jason Dunaway was appointed to the National Safety Council Board of Directors.Source: dayzim.com/news
- 2026-09-21: Josh Walsh was named to lead American Ordnance & Operations at Iowa Army Ammunition and Milan Army Ammunition Plants.Source: dayzim.com/news
Sources of record
- https://www.dayzim.com/about
- https://www.usaspending.gov/recipient/871d3c2e-a65c-bb19-0637-ee1feb016a8b-P/latest
- https://www.enr.com/toplists/2026-top-500-design-firms-4
- https://www.dayzim.com/
- https://www.dayzim.com/about/leadership
- https://tbpedownloads.s3-us-west-2.amazonaws.com/roster_firm.zip
- https://www.dayzim.com/news
Ownership tag: Family-owned. Profiles are informational, compiled from public sources linked above. Firms may request corrections. A listing is not an endorsement.
