Marmon / Keystone LLC

Southampton, MA Part of Berkshire Hathaway Inc.

UEI: NNACJDJN6H69
CAGE: 0L4M4
Primary NAICS: 423510 Metal Service Centers and Other Metal Merchant Wholesalers
SAM.gov registration: Active through Feb 24, 2027

Company facts

FY2025 rankings

Its parent company, Berkshire Hathaway Inc., ranks:

Self-certified in SAM.gov

Entity structure

Corporate Entity (Not Tax Exempt)

Other NAICS codes in SAM.gov

Corporate family

Turtle Top Parent Berkshire Hathaway Inc. · Omaha, NE UU26FKF1MML6
- Marmon / Keystone LLC

SAM.gov registration date

Jun 17, 2014

Physical address

1 Clark St, Southampton, MA 01073, USA

Website

Employees

251-1K

Estimated annual revenue

$50M-$100M

Industry

SIC code

33 Primary Metal Industries

Profiles

Registration and certifications come from SAM.gov and the SBA; company details from public web sources. Updated Feb 26, 2026.

Award	Agency	Obligated	Awarded
Pipe N3904016P0012	Defense Contract Management Agency	$60,082	Oct 7, 2015
0.5" pipe N3904015P0190	Defense Contract Management Agency	$14,677	Aug 22, 2015
Pipe N3904015P0246	Naval Sea Systems Command (Navy)	$12,672	May 21, 2015
Definitive Contract PC11A199005DN0010290C0440	Department of the Navy	$54,000	May 15, 1990
Definitive Contract DAAA2287C0439-AA220198708D0223DAAA2287C0439	Department of the Army	$30,000	Aug 15, 1987

Prime contractor	Prime award	Amount	Awarded
Ultra Electronics Ocean Systems Inc. ADC MK 3 OPT. Three tube, aluminum, extruded	N0025318C0006	$119,000	Apr 16, 2024

Yes. Marmon / Keystone LLC's SAM.gov registration is active through February 24, 2027.

Marmon / Keystone LLC's parent company, Berkshire Hathaway Inc., ranked #1 in NAICS 315220, #4 in NAICS 4491 and #4 in PSC 6650 in FY2025.

Marmon / Keystone LLC's most recent federal contract award is Pipe (N3904016P0012), from Defense Contract Management Agency, on October 7, 2015.

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