Clark Dietz Inc.

Legal name, DBA and former names

• Clark Dietz, Inc.Source: clarkdietz.com · As of 2026-10-06

Identifiers (UEI, state registrations)

• SAM UEI Q5PYVGJPA716 (as shown on the USAspending recipient record)Source: usaspending.gov/recipient/9d3a7061-8abe-ea04-13… · As of 2026-10-06

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… · As of 2025-08-26

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… · As of 2025-08-26

Services and markets

• Civil and related engineering consulting.Source: clarkdietz.com · As of 2026-10-06

Leaders

• Wes Christmas, MBA, PE, ENV SP, President and Chief Executive Officer.Source: clarkdietz.com/about-us/our-people · As of 2026-10-06
• Jerald T. Payonk, PE, Chairman of the Board.Source: clarkdietz.com/about-us/our-people · As of 2026-10-06

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… · As of 2026-10-06

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… · As of 2025-08-26

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… · As of 2025-08-26

Rankings and awards

• Listed in the ENR 2026 Top 500 Design Firms.Source: enr.com/toplists/2026-top-500-design-fi… · As of 2026-10-05

News timeline

• Firm news-events section under About.Source: clarkdietz.com/about-us/news-events · As of 2026-10-06

Sources of record

1. https://www.clarkdietz.com/
2. https://www.usaspending.gov/recipient/9d3a7061-8abe-ea04-1331-8d86a7f80513-P/latest
3. https://www.dol.gov/agencies/ebsa/about-ebsa/our-activities/public-disclosure/foia/form-5500-datasets
4. https://www.clarkdietz.com/about-us/our-people/
5. https://www.enr.com/toplists/2026-top-500-design-firms-5
6. https://www.clarkdietz.com/about-us/news-events/