DIAMOND MATERIALS, LLC

DOT# 45597 MC# 76472CARRIER

ACTIVE

Trust Score

93 / 100

A Excellent

Components

Compliance · 40% 100

Safety · 35% 90

Insurance · 25% 85

No active cargo insurance on file

Confidence: high · based on FMCSA safety, insurance & authority data How is this calculated?

Overview

Address

Physical

924 S HEALD ST

WILMINGTON, DE 19801

View on Google Maps ↗

Mailing

242 N JAMES ST SUITE 102

NEWPORT, DE 19804

Contact

Phone: (302) 658-6524

Fax: (302) 658-0684

Email: diamondmaterials@diamondmaterials.com

Company Officers

RICHARD E. PIERSON, JR

TONI WOOD

Business Info

Organization: CORPORATION

D&B #: 884222167

HazMat: HazMat Carrier

Fleet

139

Power Units

117

Drivers

Equipment Breakdown

Owned Trucks117

Owned Tractors19

Authority

Status: ACTIVE

FMCSA add date: Jun 1, 1974

Common authority: May 26, 1982

Authority History (4)

Authority Type	Action	Date
COMMON	INVOLUNTARY REVOCATION → DISCONTINUED REVOCATION	May 12, 2023 → Jun 20, 2023
MOTOR PROPERTY COMMON CARRIER	REINSTATED	Feb 15, 2012
COMMON	INVOLUNTARY REVOCATION → DISCONTINUED REVOCATION	Jan 13, 1995
MOTOR PROPERTY COMMON CARRIER	GRANTED → REVOKED	May 26, 1982 → Feb 12, 2007

Cargo Types

Logs/Poles/LumberBuilding MaterialsMachinery/Large ObjectsLiquids/GasesGarbage/RefuseChemicalsDry BulkConstruction

Active Certifications

Property

MCS-150

Last updated: Jul 2, 2025

Mileage: 676,737 (2025)

Operation Classification

PRIVATE PROPERTYAUTHORIZED FOR HIRE

Carrier Operation

Interstate

Related Companies

Company	DOT#	MC#	Location	Status	Linked By
TRI COUNTY MATERIALS LLC	4027454	1520690	NEWPORT, DE	ACTIVE	DomainPhone

Recent Changes

Safetytotal crashes: 9 → 7Nov 13, 2026

Identitycompany officer 1: RICHARD E. PIERSON, JR → RICHARD E. PIERSON, JRSep 5, 2026

Contactemail: diamondMATERIALS@DIAMONDMATERIALS.COM → diamondmaterials@diamondmaterials.comAug 20, 2026

Identitycompany officer 1: RICHARD E. PIERSON, JR → RICHARD E. PIERSON, JRAug 20, 2026

Safetytotal crashes: 8 → 9Aug 17, 2026

Safety

Out-of-Service Rates

Driver125 inspections

2.4%

6.3%

Carrier National avg

Vehicle88 inspections

10.2%

22.9%

Carrier National avg

Hazmat5 inspections

0.0%

2.5%

Carrier National avg

Overall125 inspections

9.6%

Carrier

Crash Summary

Fatal

Injury

7.0

per 1M miles

Towaway

Total

BASIC Violations

Unsafe Driving34

Driver Fitness6

Hours of Service0

Drug / Alcohol0

Vehicle Maintenance37

Safety Measurement System (SMS)

FMCSA's official per-BASIC roadside-performance measures over the trailing 24 months, computed from the 123 inspections below. A measure of 0 means no recorded violations in that BASIC — not necessarily a strong safety record on a small sample. FMCSA does not publish peer-group percentiles for property carriers, so the underlying measures — not percentile rankings — are shown; Hazmat Compliance and Crash Indicator are not published.

SMS Inspections (24 mo)

123

Total

Driver OOS

Vehicle OOS

BASIC Measures

Unsafe Driving1.0812 insp w/ viol

Hours of Service0.000 insp w/ viol

Driver Fitness0.225 insp w/ viol

Controlled Substances0.000 insp w/ viol

Vehicle Maintenance1.8021 insp w/ viol

Insurance

$1,000,000

BIPD Coverage

—

Cargo Coverage

1 policy on file1 active

Type	Status	Insurer	Policy #	Coverage	Effective	Expires	Form
BIPD	Active	ARCH INSURANCE COMPANY	ZACAT9130400	$1,000,000	Jan 1, 2012	—	91X

Insurance History (4)

Type	Insurer	Status	Coverage	Effective	Cancelled
CARGO · F34	SELECTIVE WAY INSURANCE COMPANY	CancelledCANCEL	$750,000	May 23, 1997	Feb 2, 2007
CARGO · F34	SELECTIVE INSURANCE COMPANY OF AMERICA	ReplacedTERM/REPL	$750,000	Jan 13, 1995	May 23, 1997
BIPD · F91	MARYLAND CASUALTY CO.	CancelledCANCEL	$750,000	Apr 1, 1988	Jul 23, 2008
CARGO · F34	PENNSYLVANIA MANUF. ASSOC. INS.	CancelledCANCEL	$750,000	Apr 1, 1987	Jan 13, 1995

Get this data via API

API Reference

curl https://api.dotlookup.dev/v1/carriers/45597