Every fact below links to its source. Informational only. Ownership statements are limited to primary announcements and filings.
- Headquarters
- IllinoisSource: clarkdietz.com
- Founded
- 1953 (home page: Engineering Quality of Life since 1953)Source: clarkdietz.com
- Ownership type
- Employee-owned (ESOP): DOL Form 5500 lists Clark Dietz, Inc. Employee Stock Ownership Plan (NAICS 541330)Source: dol.gov/agencies/ebsa/about-ebsa/our-ac…
- Sponsor or parent
- DOL Form 5500 ESOP filing is the primary public record of employee ownershipSource: dol.gov/agencies/ebsa/about-ebsa/our-ac…
- Website
- clarkdietz.comSource: clarkdietz.com
Legal name, DBA and former names
- Clark Dietz, Inc.Source: clarkdietz.com
Identifiers (UEI, state registrations)
- SAM UEI Q5PYVGJPA716 (as shown on the USAspending recipient record)Source: usaspending.gov/recipient/9d3a7061-8abe-ea04-13…
Ownership type
- Employee-owned (ESOP): DOL Form 5500 lists Clark Dietz, Inc. Employee Stock Ownership Plan (NAICS 541330)Source: dol.gov/agencies/ebsa/about-ebsa/our-ac…
Sponsor, parent or transaction
- DOL Form 5500 ESOP filing is the primary public record of employee ownership.Source: dol.gov/agencies/ebsa/about-ebsa/our-ac…
Services and markets
- Civil and related engineering consulting.Source: clarkdietz.com
Leaders
- Wes Christmas, MBA, PE, ENV SP, President and Chief Executive Officer.Source: clarkdietz.com/about-us/our-people
- Jerald T. Payonk, PE, Chairman of the Board.Source: clarkdietz.com/about-us/our-people
Federal awards (contracts)
- USAspending recipient record CLARK DIETZ INC (Champaign, IL), contract award obligations: FY2021 $0, FY2022 $0, FY2023 $0, FY2024 $0, FY2025 $0 (award types A to D; obligations as published, including modifications and negative adjustments)Source: usaspending.gov/recipient/9d3a7061-8abe-ea04-13…
ESOP plan data (Form 5500)
- DOL Form 5500 plan year beginning 2024-01-01: CLARK DIETZ, INC. EMPLOYEE STOCK OWNERSHIP PLAN (ACK_ID 20250826120914NAL0004423891001), 193 active participants and total plan assets of $11,480,011 at year end.Source: dol.gov/agencies/ebsa/about-ebsa/our-ac…
Public filings
- DOL Form 5500 filings, plan year beginning 2024-01-01, NAICS 541330: CLARK DIETZ, INC. EMPLOYEE STOCK OWNERSHIP PLAN (ACK_ID 20250826120914NAL0004423891001, 193 active participants)Source: dol.gov/agencies/ebsa/about-ebsa/our-ac…
Rankings and awards
- Listed in the ENR 2026 Top 500 Design Firms.Source: enr.com/toplists/2026-top-500-design-fi…
News timeline
- Firm news-events section under About.Source: clarkdietz.com/about-us/news-events
Sources of record
- https://www.clarkdietz.com/
- https://www.usaspending.gov/recipient/9d3a7061-8abe-ea04-1331-8d86a7f80513-P/latest
- https://www.dol.gov/agencies/ebsa/about-ebsa/our-activities/public-disclosure/foia/form-5500-datasets
- https://www.clarkdietz.com/about-us/our-people/
- https://www.enr.com/toplists/2026-top-500-design-firms-5
- https://www.clarkdietz.com/about-us/news-events/
Ownership tag: Employee-owned (ESOP). Profiles are informational, compiled from public sources linked above. Firms may request corrections. A listing is not an endorsement.
