| IAIntegral Aerospace, LLC | Santa Ana | — | ● ACTIVE |
Integral Products, INC. | Harbor City | — | ● ACTIVE |
| ICItalix Company | Morgan Hill | 20–99 | ● ACTIVE |
Jaco Engineering | Anaheim | — | ● ACTIVE |
J A-co Machine Works, LLC | Scotts Valley | — | ● ACTIVE |
Jaffa Precision Engineering, INC. | Riverside | — | ● ACTIVE |
Jmt INC. | Norwalk | — | ● ACTIVE |
| JMJoels Machine Shop INC | El Monte | — | ● ACTIVE |
| JMJohnson Manufacturing, INC. | Huntington Beach | — | ● ACTIVE |
Jr Machining LLC | Rohnert Park | — | ● ACTIVE |
Kak Industry LLC | Oxnard | — | ● ACTIVE |
Kaydek Machining, INC. | San Jose | — | ● ACTIVE |
| KSKb Sheetmetal Fabrication, INC. | Fountain Valley | — | ● ACTIVE |
Kd Precision Machining INC. | Corona | — | ● ACTIVE |
Kennedy Name Plate CO | Vernon | — | ● ACTIVE |
K & L Anodizing Corporation | Burbank | — | ● ACTIVE |
Krisalis Precision Machining | San Andreas | — | ● ACTIVE |
| KMKrobach Mfg. CORP. | Hayward | — | ● ACTIVE |
| KCKryler CORP | Fullerton | 20–99 | ● ACTIVE |
Lawrence Roll Up Doors, INC. | Baldwin Park | — | ● ACTIVE |
L & B Laboratories INC | San Jose | — | ● ACTIVE |
Lefiell Manufacturing Company | Santa Fe Springs | — | ● ACTIVE |
| LSLevac Specialties INC. | Gold River | — | ● ACTIVE |
L.f. Industries, INC. | Carlsbad | — | ● ACTIVE |
Lindsey Manufacturing CO | Azusa | — | ● ACTIVE |
L & M Machining Corporation | Placentia | — | ● ACTIVE |
| LMLnp Machining | San Jose | — | ● ACTIVE |
Lockheed Martin Corporation | Ventura | — | ● ACTIVE |
Long-lok, LLC | Carson | — | ● ACTIVE |
Long Machine, INC | Temecula | — | ● ACTIVE |
Loutech LLC | Chino | — | ● ACTIVE |
Lynco Grinding Company INC | Bell Gardens | — | ● ACTIVE |
| MPM3 Precision, LLC | Santa Maria | 20–99 | ● ACTIVE |
Mac Cal CO | San Jose | — | ● ACTIVE |
Machineworks Manufacturing | Northridge | — | ● ACTIVE |
Macias Sheet Metal | Los Angeles | — | ● ACTIVE |
Magna Tool INC. | Cypress | — | ● ACTIVE |
Maney Aircraft, INC. | Ontario | — | ● ACTIVE |
Martin Aerospace Corporation | Los Angeles | — | ● ACTIVE |
Martinez and Turek, INC. | Rialto | — | ● ACTIVE |
Marton Precision Manufacturing, LLC | Fullerton | 20–99 | ● ACTIVE |
Marx Digital Mfg. INC. | Santa Clara | — | ● ACTIVE |
Mass Precision, INC. | San Jose | — | ● ACTIVE |
Master Metal Products Company | San Jose | — | ● ACTIVE |
Master Precision Machining | Santa Clara | — | ● ACTIVE |
Master Research & Manufacturing, INC. | Norwalk | — | ● ACTIVE |
Mattco Forge, INC. | Paramount | — | ● ACTIVE |
Maverick Aerospace LLC | City of Industry | — | ● ACTIVE |
Mckenzie Machining INC | San Jose | — | ● ACTIVE |
| MPMdc Precision LLC | Hayward | — | ● ACTIVE |