| Les Gribskov Company | Bend | OR | $0 |
| Lewis Precision & CNC Inc. | Theodore | AL | Subcontractor |
| L & H Industrial Inc. | Gillette | WY | Subcontractor |
| Liberty Tool Inc. | Sterling Heights | MI | Subcontractor |
| Lidell Specialty Products, Inc. | Whitmore Lake | MI | $0 |
| Lightning Aerospace LLC | Park City | KS | $0 |
| Lincoln Structural Solutions LLC | Louisville | NE | Subcontractor |
| Lincoln Tool & Machine Corp. | Hudson | MA | Subcontractor |
| Linc Products & Services LLC | Gerry | NY | Subcontractor |
| Lindsay Machine Works, Inc. | Independence | MO | Subcontractor |
| Linear & Metric, LLC | Londonderry | NH | Subcontractor |
| Litron, LLC | Agawam | MA | Subcontractor |
| Livingston Tool & MFG. Co. | O Fallon | MO | Subcontractor |
| L & M Equipment Company LLC | Tipp City | OH | Subcontractor |
| L & M Machining Corporation | Placentia | CA | Subcontractor |
| L & M Precision Machine, Inc. | Southbridge | MA | $0 |
| LNP Machining | San Jose | CA | $0 |
| Lodor Enterprises, Inc. | Dallas | TX | Subcontractor |
| Logan Machine Company | Akron | OH | Subcontractor |
| Logan Machine Works Inc. | Phenix City | AL | $0 |
| Longleaf Machining LLC | Brewton | AL | $0 |
| Loper Machine LLC | Edgewood | MD | Subcontractor |
| LTP Modern Machine, Inc. | Cypress | CA | Subcontractor |
| Lumar Machining & Manufacturing Ltd. | St Thomas | ON | Subcontractor |
| Lund Custom Machining, Inc. | Shelton | WA | $0 |
| L & W Machine Inc. | Norfolk | VA | $0 |
| Lynchburg Machining, LLC | Lynchburg | VA | $0 |
| M-1 Tool Works, Inc. | Mchenry | IL | Subcontractor |
| Machine Incorporated | Stoughton | MA | Subcontractor |
| Machine Sciences Corp. | Tualatin | OR | Subcontractor |
| Machine Tech, Inc. | Houma | LA | $0 |
| Machine Tool Engineering, Inc. | Charles City | IA | $0 |
| Machine Tool Technology LLC | South Chesterfield | VA | Subcontractor |
| Machinex, Inc. | Chula Vista | CA | $0 |
| Machining Technology Inc. | Suffolk | VA | $0 |
| Mackentepe Machine & Tool, Inc. | Vinemont | AL | Subcontractor |
| Maehr Industries, Inc. | Bellport | NY | $0 |
| Magic Machine Co. LLC | Albuquerque | NM | $0 |
| Magna Tool Inc. | Cypress | CA | Subcontractor |
| Magnificent Machine LLC | Silverdale | WA | $0 |
| Maine Machine Products Company | South Paris | ME | Subcontractor |
| Mair-mac Machine Company, Inc. | Brockton | MA | Subcontractor |
| Manitowoc Tool & Machining LLC | Manitowoc | WI | Subcontractor |
| Mann Co. Machine Works LLC | Lancaster | CA | Subcontractor |
| Manufacturing Technologies, Inc. | Bernalillo | NM | Subcontractor |
| Marathon Technologies, Inc. | Estero | FL | $0 |
| Maria Eugenia Barath | Hayward | CA | Subcontractor |
| Marion Mold & Tool, Inc. | Marion | VA | Subcontractor |
| Markley Enterprises LLC | Cincinnati | OH | $0 |
| Maroney Company, LLC | Northridge | CA | Subcontractor |
| Marshall Precision Manufacturing, Inc. | Guntersville | AL | Subcontractor |
| Marten Machining, Inc. | Stevens Point | WI | Subcontractor |
| Masterbilt Inc. | South Bend | IN | Subcontractor |
| Master Machine Inc. | Ham Lake | MN | Subcontractor |
| Master Machine LLC | Chattanooga | TN | Subcontractor |
| Master Machine & Tool Co. Inc. | Newport News | VA | Subcontractor |
| Master Model Craft, Inc. | Bristol | TN | $0 |
| Master Precision Machining | Santa Clara | CA | Subcontractor |
| Matrix Machine Inc. | Tempe | AZ | Subcontractor |
| Maul MFG., Inc. | Santa Ana | CA | $0 |
| Maximum Industries, Inc. | Irving | TX | Subcontractor |
| Maxson Automatic Machinery Co. | Westerly | RI | $0 |
| Maynard Inc. | Fayetteville | AR | Subcontractor |
| Mcallister Tool & Machine Inc. | Huntsville | AL | Subcontractor |
| Mcclintic R-D-M, Inc. | Albuquerque | NM | Subcontractor |
| Mcquillen Manufacturing LLC. | Honeoye Falls | NY | Subcontractor |
| MDF Enterprises LLC | Dayton | OH | Subcontractor |
| Mdi Manufacturing, Inc. | Lakewood | NJ | $0 |
| Mechanical Manufacturing Corp. | Sunrise | FL | Subcontractor |
| Mega Machine Shop, Inc. | Tumwater | WA | Subcontractor |
| M. E. Hodge Corporation | Riverside | CA | $0 |
| Merchants Automatic Products Inc. | Canton | MI | $0 |
| Meridian Industrial Group, LLC | Holyoke | MA | Subcontractor |
| Merit Gage Inc. | Minneapolis | MN | Subcontractor |
| Merritt Preferred Components Inc. | Kilgore | TX | Subcontractor |
| Meschkat Precision Machining, Inc. | Santa Clarita | CA | Subcontractor |
| Metalcraft Inc. | Tempe | AZ | Subcontractor |
| Metal Craft Machine & Engineering, Inc. | Elk River | MN | Subcontractor |
| Metal-fab Services Industry, Inc. | Anaheim | CA | Subcontractor |
| Metal Machining LLC | Ogden | UT | Subcontractor |
| Metal Products, Incorporated | Appleton | WI | Subcontractor |
| Metal Shop, Inc. The | Syracuse | UT | $0 |
| Metal Tech Inc. | Gulfport | MS | Subcontractor |
| Metaltech, Inc. | Auburn | WA | Subcontractor |
| Metal Works Precision Machine & Tool Inc. | Tucson | AZ | Subcontractor |
| Meta Manufacturing Corp. | Blue Ash | OH | Subcontractor |
| Metlfab Inc. | Frederick | MD | Subcontractor |
| Metro Machine, Inc. | Englewood | CO | Subcontractor |
| Mettl LLC | Houston | TX | $0 |
| M & H Engineering Co. Inc. | Danvers | MA | $0 |
| Mica-tron Products Corp. | Holbrook | MA | Subcontractor |
| Michael O Carriaga | Carlsbad | NM | Subcontractor |
| Microcut, Inc. | York | PA | Subcontractor |
| Micro Facture LLC | Lancaster | PA | Subcontractor |
| Micro Machine Works, Inc. | Vincent | OH | $0 |
| Micron Applied Technologies, Inc. | Crosbyton | TX | Subcontractor |
| Micron Precision Machining Inc. | Saginaw | MI | Subcontractor |
| Micro Steel, Inc. | Canoga Park | CA | Subcontractor |
| Micro-tech Production Machine Co. Inc. | Londonderry | NH | Subcontractor |
| Microwave Components Specialists, Inc. | Orleans | MA | Subcontractor |
