Carrier profile · USDOT 1511513 · Updated Jun 13, 2026
STEWART BUILDERS INC
DBA KEYSTONE CONCRETE
30 power unitsavg 7 yrLocal · 1 statesHOUSTON, TX74/100
AUTHORITY STATUS UNKNOWN
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
@keystoneconcrete.com — 2 carriers: USDOT 2046351
Shares a company officer with other carriers
mark stewart — 17 carriers: USDOT 134519USDOT 844172USDOT 1029796USDOT 1483548USDOT 1936734USDOT 1943543USDOT 2004099USDOT 2029426
Capacity consistency· registered vs roadside-observed power units
Registered (MCS-150)3030
Observed (24 mo)77
Registered capacity materially exceeds what is observed roadside — the MCS-150 may be stale or the fleet under-utilized.
Owner / group view· confidence: email domain + officer
Owner / group view
Affiliated authorities
Collapses 18 related authorities · joined by email domain + officer
- Authorities
- 18
- Combined power
- 67
- States
- 12
- Oldest authority
- Jun 1, 1974
- Active now
- 10
- STEWART BUILDERS INC· viewingUSDOT 151151330PU
- J T STEWART & SONS LLCUSDOT 20040998PU
- ARS RECYCLING SYSTEMS LLCUSDOT 23962504PU
- MARK STEWARTUSDOT 10297963PU
- STEWART TOOL CO INCUSDOT 14835483PU
- DREXEL CHEMICAL COMPANYUSDOT 1345193PU
- MARK STEWART INCUSDOT 21494033PU
- STEWART EXCAVATINGUSDOT 23521202PU
- MARK STEWARTUSDOT 20294262PU
- MARK A STEWARTUSDOT 19435432PU
- MARK STEWARTUSDOT 28300311PU
- MARK STEWARTUSDOT 25225841PU
- AMERICAN EAGLEFLIGHT INCUSDOT 8441721PU
- MARK STEWARTUSDOT 20930551PU
- KMACOUSDOT 21488591PU
- DONALD CRAIG STEWARTUSDOT 20463511PU
- MARK STEWARTUSDOT 19367341PU
- MARK STEWARTUSDOT 21036160PU
Affiliated entities· hover to preview