Every fact below links to its source. Informational only. Ownership statements are limited to primary announcements and filings.
- Headquarters
- Waltham, Mass., as listed by ENR in the 2026 Top 500 Design FirmsSource: enr.com/toplists/2026-top-500-design-fi…
- Founded
- 1956Source: sgh.com/who-we-are/firm-profile
- Employees
- 800 employees, per the firm's siteSource: sgh.com/who-we-are/firm-profile
- Ownership type
- Ownership not published
Legal name, DBA and former names
- The firm is Simpson Gumpertz & Heger (SGH)Source: sgh.com/who-we-are/firm-profile
Identifiers (UEI, state registrations)
- SAM UEI FL6ACVUJMGN9 (as shown on the USAspending recipient record) and Texas TBPELS firm no. 5107.Source: usaspending.gov/recipient/5f6ccc60-df80-46b4-b2…
Offices
- SGH has office locations throughout the United States.Source: sgh.com/who-we-are/firm-profile
Employee count or band
- 800 employees, per the firm's site.Source: sgh.com/who-we-are/firm-profile
Services and markets
- SGH provides services in structures, building enclosures, advanced analysis, performance and code consulting, and applied science and research across commercial, culture and entertainment, education, energy, government, health care and life sciences, industrial, infrastructure and transportation, residential, and science and defense markets.Source: sgh.com
Leaders
- James Parker, Chief Executive Officer.Source: sgh.com/who-we-are/our-people
- Niklas Vigener, Chief Operating Officer.Source: sgh.com/who-we-are/our-people
- Martin Mullins, Chief Financial Officer.Source: sgh.com/who-we-are/our-people
Licences (board records)
- Texas TBPELS roster lists SIMPSON GUMPERTZ & HEGER INC (firm no. 5107, type NS, expires 2028-07-31)Source: tbpedownloads.s3-us-west-2.amazonaws.com/roster_firm.zip
Federal awards (contracts)
- USAspending recipient record SIMPSON GUMPERTZ & HEGER INC. (Waltham, MA), contract award obligations: FY2021 $51,500, FY2022 $2,016,958, FY2023 $143,690, FY2024 $5,041,263, FY2025 $651,149 (award types A to D; obligations as published, including modifications and negative adjustments)Source: usaspending.gov/recipient/5f6ccc60-df80-46b4-b2…
Public filings
- DOL Form 5500 filings, plan year beginning 2024-01-01, NAICS 541330: SGH PROFIT SHARING & 401(K) PLAN AND TRUST (ACK_ID 20251120131751NAL0008289872001, 765 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…
Sources of record
- https://www.sgh.com/who-we-are/firm-profile/
- https://www.usaspending.gov/recipient/5f6ccc60-df80-46b4-b280-e97b0a053711-P/latest
- https://www.enr.com/toplists/2026-top-500-design-firms-2
- https://www.sgh.com/
- https://www.sgh.com/who-we-are/our-people/
- https://tbpedownloads.s3-us-west-2.amazonaws.com/roster_firm.zip
- https://www.dol.gov/agencies/ebsa/about-ebsa/our-activities/public-disclosure/foia/form-5500-datasets
Ownership tag: Ownership not published. Profiles are informational, compiled from public sources linked above. Firms may request corrections. A listing is not an endorsement.
