D
FMCSA registered · Corporation · Authority since 1974

DIAMOND MATERIALS LLC

WILMINGTON, DE
DOT
45597
MC Docket
76472
Authority
PRIVATE PROPERTY;AUTHORIZED FOR HIRE · Hazmat
Safety
Conditional

About DIAMOND MATERIALS LLC

Diamond Materials Llc is a large fleet operator based in Wilmington, DE, registered with the FMCSA since 1974 (52 years). The carrier operates 139 power units and 117 drivers, placing it in the top 95th percentile of US for-hire carriers by fleet size. Operating authority: PRIVATE PROPERTY, AUTHORIZED FOR HIRE, with hazardous-materials endorsement. Reported 676,737 annual miles for 2025 — approximately 4,869 miles per power unit. Cargo carried includes chemicals, liquids and gases, building materials, drybulk, and garbage and refuse. FMCSA safety rating: Conditional (issued May 1988).

Browse other for-hire carriers based in DE, or see all FMCSA-registered carriers.

Fleet & operations

Power units
139

136 straight trucks

Drivers
117
Annual miles
676,737

reported for 2025


Cargo carried

Chem Liqgas Bldgmat Drybulk Garbage Logpole Machlrg Construct

Equipment owned

Truck
117
Tractor
19
Trailer
35

Data sourced from FMCSA Company Census (public domain). Last refreshed May 4, 2026. MCS-150 last updated Jul 2025. Safety rating issued May 1988.