Hellmuth, Obata & Kassabaum, Inc.
St. Louis, MO Part of Hok, Inc.
- UEI
- CQJLYUAF62J3
- CAGE
- 3JYX6
- Primary NAICS
- 541310 Architectural Services
- SAM.gov registration
- Active through
Company facts
- FY2025 rankings
- Self-certified in SAM.gov
- Entity structure
- Corporate Entity (Not Tax Exempt)
- Other NAICS codes in SAM.gov
-
- 541320 Landscape Architectural Services
- 541330 Engineering Services
- 541350 Building Inspection Services
- 541410 Interior Design Services
- 541430 Graphic Design Services
- 541490 Other Specialized Design Services
- 541611 Administrative Management and General Management Consulting Services
- 541618 Other Management Consulting Services
- Corporate family
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-
Parent
DHZRTAFD81L3
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Parent
DHZRTAFD81L3
- SAM.gov registration date
- Physical address
- 701 Market St Suite 400, St. Louis, MO 63101, USA
- Website
- hok.com
- Founded
- 1955
- Employees
- 1K-5K
- Estimated annual revenue
- $250M-$500M
- Industry
-
- Industrials
- Commercial & Professional Services
- Professional Services
- Architecture
- SIC code
- 87 Engineering & Management Services
- Profiles
Registration and certifications come from SAM.gov and the SBA; company details from public web sources. Updated .
Contract obligations by fiscal year
| Fiscal year | Obligated |
|---|---|
| FY2027 To date | $103,658 |
| FY2026 | $2,545,782 |
| FY2025 | $20,655,014 |
| FY2024 | $4,809,826 |
| FY2023 | $3,379,414 |
Top agencies by obligations
| Rank | Agency | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | General Services Administration | $2,422,836 | |
| 2 | Nuclear Regulatory Commission | $226,604 |
Contract vehicles
Contract awards
Latest 5 listed here. See the rest on GovTribe.
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| Studios Architecture | Washington, DC | 541310 Architectural Services |
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| Beyer Blinder Belle Architects & Planners LLP | Washington, DC | 541310 Architectural Services |
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About the company
Hellmuth, Obata & Kassabaum, Inc. (HOK) is a global design and architecture firm registered in the federal government's System for Award Management (SAM) since 2003. As a for-profit corporate entity, HOK specializes in providing comprehensive architectural, engineering, and interior design services to federal agencies. The firm has established itself as a prominent service provider for government facility design and renovation projects, demonstrating expertise in creating functional and innovative spaces for various federal institutions.
HOK has been awarded multiple federal contracts across different agencies, primarily focusing on architectural and engineering services for government buildings. These contracts include design work for courthouses, government office renovations, and facility support projects. The firm has received contracts from agencies such as the U.S. Nuclear Regulatory Commission (NRC), General Services Administration (GSA), and Commodity Futures Trading Commission (CFTC). The contract awards range from furniture design services to comprehensive building renovation projects, with contract values spanning from $165,529 to $17,435,953. None of the contracts were designated as small business set-asides, indicating HOK's established status in federal contracting. The firm frequently collaborates with subcontractors like Imeg Consultants Corp., Wiss, Janney, Elstner Associates, Inc., and Ocmi Inc. to provide specialized engineering, building envelope, and cost estimation services.
HOK holds a significant $125 million multiple-award Indefinite Delivery, Indefinite Quantity (IDIQ) contract with the GSA, specifically for the National Architecture, Engineering, and Interiors services. This contract, awarded in November 2022, has a base period of 5 years with four additional 1-year option periods, extending until November 2027. Under this IDIQ vehicle, HOK has received numerous task orders from various federal agencies, covering a wide range of services including office space renovations, hurricane repair projects, facility support, and design services for federal buildings. The contract allows HOK to provide nationwide architectural, engineering, and interior design services across multiple federal agencies, with task orders targeting specific regional office improvements, courthouse designs, and facility support projects.
Quick answers
Is Hellmuth, Obata & Kassabaum, Inc. registered in SAM.gov?
Yes. Hellmuth, Obata & Kassabaum, Inc.'s SAM.gov registration is active through December 11, 2026.
Which contract vehicles does Hellmuth, Obata & Kassabaum, Inc. hold?
Hellmuth, Obata & Kassabaum, Inc. holds a place on 1 federal contract vehicle: National Architecture, Engineering, and Interiors.
How much has Hellmuth, Obata & Kassabaum, Inc. received in federal contracts?
Federal contracts obligated $20,655,014 to Hellmuth, Obata & Kassabaum, Inc. in fiscal year 2025 and $31,493,694 in fiscal years 2023 through 2027.
How does Hellmuth, Obata & Kassabaum, Inc. rank among federal contractors?
Hellmuth, Obata & Kassabaum, Inc. ranked #3 in PSC C1AA, #4 in NAICS 54131 and #11 in PSC C1 in FY2025.
What is Hellmuth, Obata & Kassabaum, Inc.'s most recent federal award?
Hellmuth, Obata & Kassabaum, Inc.'s most recent federal contract award is Furniture design service award and related services, the US nuclear regulatory commission, at 245 peachtree center… (47PF0025F0701), from Region 5 (PBS), on August 19, 2025.
On GovTribe
See Hellmuth, Obata & Kassabaum, Inc.'s full federal record
- Federal contract awards
- IDV awards
- Contract vehicles
- Subcontracting relationships
- Funding analysis by agency, NAICS and set-aside
- Similar vendors