Carrier profile · USDOT 1189816 · Updated Aug 12, 2026
Gypsum Supply Company
DBA RYAN BUILDING MATERIALS
82 power unitsBYRON CENTER, MI50/100
AUTHORITY STATUS UNKNOWNRATED SATISFACTORY
Network & Fraud
Reincarnation chains, shared-VIN links, common domains and officers, and owner-group affiliations — the chameleon / double-broker signals that name-and-USDOT lookups miss.
Shares a registration email domain with other carriers
@gms.com — 5 carriers: USDOT 313108USDOT 403686USDOT 2634473USDOT 2862139
Shares a company officer with other carriers
andrew horner — 2 carriers: USDOT 2862139
Owner / group view· confidence: email domain + officer
Owner / group view
Affiliated authorities
Collapses 5 related authorities · joined by email domain + officer
- Authorities
- 5
- Combined power
- 628
- States
- 4
- Oldest authority
- Apr 13, 1988
- Active now
- 3
- GYPSUM SUPPLY COMPANY· viewingUSDOT 118981682PU
- GTS DRYWALL SUPPLY COMPANYUSDOT 313108214PU
- TAMARACK MATERIALS INCUSDOT 403686209PU
- PACIFIC GYPSUM SUPPLY INCUSDOT 263447377PU
- GYPSUM SUPPLY INSTALLED INSULATION LLCUSDOT 286213946PU
Affiliated entities· hover to preview