| CWC. William Hetzer/beaver Creek West | Hagerstown | — | ◇ UNVERIFIED |
| DRDorsey Run Lp, Llc/annapolis Junction Plant | Jessup | — | ◇ UNVERIFIED |
| EMErnest Maier INC. | Ocean City | — | ◇ UNVERIFIED |
| FEFritz Enterprises | Sparrows Point | — | ◇ UNVERIFIED |
| GGGo Glass Joy, LLC | Salisbury | — | ◇ UNVERIFIED |
| GIGranix INC | Laurel | — | ◇ UNVERIFIED |
| GIGranix, INC. | Columbia | — | ◇ UNVERIFIED |
| HMHerbert Malarkey Roofing Company | Williamsport | — | ◇ UNVERIFIED |
| HCHowlin Concrete, INC. | Owings | — | ◇ UNVERIFIED |
| HCHydro Conduit Corporation | Frederick | — | ◇ UNVERIFIED |
| ITIn The Mix Decorative Concrete LLC | Charlotte Hall | — | ◇ UNVERIFIED |
| LNLafarge North America C/o the Corporation Trust, INC | Lutherville | — | ◇ UNVERIFIED |
| LNLafarge North America INC. and Its Successors | Baltimore | — | ◇ UNVERIFIED |
| LPLa Plata Ready Mix Concrete | La Plata | — | ◇ UNVERIFIED |
| LELarry E. Knight, INC. | Glyndon | — | ◇ UNVERIFIED |
| LCLehigh Cement Company | Union Bridge | — | ◇ UNVERIFIED |
| MMMarble Mantel, INC. | Rockville | — | ◇ UNVERIFIED |
| MPMaryland Place Holder 15 | Elkridge | — | ◇ UNVERIFIED |
| MSMaryland Style Marble & Granite, INC | Edgewater | — | ◇ UNVERIFIED |
| MQMillville Quarry | Baltimore | — | ◇ UNVERIFIED |
| MMM & M Precast INC | North East | — | ◇ UNVERIFIED |
 Nelson Precast Products, LLC | Baltimore | — | ◇ UNVERIFIED |
| Nelson Precast Products, LLC | Towson | — | ◇ UNVERIFIED |
| OAOldcastle Apg Northeast, INC. | Odenton | — | ◇ UNVERIFIED |
| PHPcs Holdings LLC | Waldorf | — | ◇ UNVERIFIED |
| PFPeri Formwork Systems INC. | Elkridge | — | ◇ UNVERIFIED |
| PPPerryville Portable Plant | Perryville | — | ◇ UNVERIFIED |
| PGProtec Glass, LLC | Frederick | — | ◇ UNVERIFIED |
| PGProtec Glass LLC T a Rowland Glass Studios | Frederick | — | ◇ UNVERIFIED |
| QPQueenstown Plant | Queenstown | — | ◇ UNVERIFIED |
| RGR Ganassa Tile CO INC | Ijamsville | — | ◇ UNVERIFIED |
| RRRichann Rodeheaver, LLC | Oakland | — | ◇ UNVERIFIED |
| RTRock Tops Fabrication INC | Owings Mills | — | ◇ UNVERIFIED |
| SSalisbury | Salisbury | — | ◇ UNVERIFIED |
| SGS - G Concrete Company, Llc- Grantley Ave. Plant | Baltimore | — | ◇ UNVERIFIED |
| TCThoro-goods Concrete CO INC | Salisbury | — | ◇ UNVERIFIED |
| UGUnited Granite LLC | Elkridge | — | ◇ UNVERIFIED |
| UNUs301 Nice-middleton Bridge Replacement Project | Newburg | — | ◇ UNVERIFIED |
| VMVulcan Materials Company | Baltimore | — | ◇ UNVERIFIED |
| VMVulcan Materials Company | Baltimore | — | ◇ UNVERIFIED |
| WGWard & Gray INC. | Silver Spring | — | ◇ UNVERIFIED |
| WRWoodsboro Ready-mix Concrete Plant | Woodsboro | — | ◇ UNVERIFIED |
