| $350,000–1 million | KMEIER ROOF SYSTEM, INC | SAINT LOUIS, MO | Montgomery Bank |
| $1–2 million | KNOW INK, LLC | SAINT LOUIS, MO | The Central Trust Bank |
| $150,000–350,000 | KOBE OF WESTPORT, INC | SAINT LOUIS, MO | RCB Bank |
| $150,000–350,000 | KOCH DEVELOPMENT CO. | SAINT LOUIS, MO | The Central Trust Bank |
| $350,000–1 million | KOHNER PROPERTIES, INCORPORATED | SAINT LOUIS, MO | Busey Bank |
| $150,000–350,000 | KOL RINAH | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $150,000–350,000 | KOMAN PROPERTIES, INC. | SAINT LOUIS, MO | First Bank |
| $150,000–350,000 | KOMOREK BROTHERS, INC. | SAINT LOUIS, MO | Royal Banks of Missouri |
| $150,000–350,000 | KOPLAR COMMUNICATIONS, LLC | SAINT LOUIS, MO | Simmons Bank |
| $350,000–1 million | KOPYTEK, INC | SAINT LOUIS, MO | Carrollton Bank |
| $1–2 million | KOREIN TILLERY, LLC | SAINT LOUIS, MO | Busey Bank |
| $150,000–350,000 | KORTENHOF MCGLYNN & BURNS,LLC | SAINT LOUIS, MO | U.S. Bank, National Association |
| $150,000–350,000 | KOWELMAN ENGINEERING, INC. | SAINT LOUIS, MO | BMO Bank National Association |
| $350,000–1 million | KRAMER & FRANK, PC | SAINT LOUIS, MO | Commerce Bank |
| $150,000–350,000 | KREIS' RESTAURANT, INC | SAINT LOUIS, MO | Bank of America, National Association |
| $350,000–1 million | KRISTIANE NAEGLER DMD LLC | SAINT LOUIS, MO | Commerce Bank |
| $150,000–350,000 | KRYMAR LLC | SAINT LOUIS, MO | U.S. Bank, National Association |
| $150,000–350,000 | KSL BILLING AND MANAGEMENT LLC | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $150,000–350,000 | KSL GLOBAL MARKET RESEARCH LLC | SAINT LOUIS, MO | Carrollton Bank |
| $150,000–350,000 | KUHLMANN DESIGN GROUP, INC. | SAINT LOUIS, MO | Lindell Bank & Trust Company |
| $150,000–350,000 | KWK ARCHITECTS LLC | SAINT LOUIS, MO | U.S. Bank, National Association |
| $350,000–1 million | KX SOLUTIONS LLC | SAINT LOUIS, MO | First Mid Bank & Trust, National Association |
| $150,000–350,000 | L&C TRUCK REPAIR INC. | SAINT LOUIS, MO | U.S. Bank, National Association |
| $150,000–350,000 | L&T ENTERPRISES LLC | SAINT LOUIS, MO | Southern Bank |
| $150,000–350,000 | L&T LANDSCAPE AND TREE LLC | SAINT LOUIS, MO | Southern Bank |
| $350,000–1 million | L. E. SAUER MACHINE CO. | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $350,000–1 million | L. GRASSE & ASSOCIATES INC. | SAINT LOUIS, MO | Montgomery Bank |
| $150,000–350,000 | L.H. ERECTION COMPANY, INC. | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $150,000–350,000 | LA BONNE BOUCHEE DE SAINT LOUIS, INC. | SAINT LOUIS, MO | Midwest Regional Bank |
| $150,000–350,000 | LA SALLE CHARTER SCHOOLS INC | SAINT LOUIS, MO | PNC Bank, National Association |
| $1–2 million | LABARGE COATING, LLC | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $350,000–1 million | LACINY BROS INC | SAINT LOUIS, MO | PNC Bank, National Association |
| $150,000–350,000 | LACLAIR PAINTING & DECORATING COMPANY | SAINT LOUIS, MO | Carrollton Bank |
| $150,000–350,000 | LADUE CHAPEL PRESBYTERIAN CHURCH | SAINT LOUIS, MO | Commerce Bank |
| $150,000–350,000 | LADUE PHARMACY | SAINT LOUIS, MO | Merchants Bank of Indiana |
| $150,000–350,000 | LAND DYNAMICS, INC. | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $150,000–350,000 | LANDER BOOKBINDING CORPORATION | SAINT LOUIS, MO | UMB Bank, National Association |
| $350,000–1 million | LANDVATTER READY MIX, INC | SAINT LOUIS, MO | Commerce Bank |
| $350,000–1 million | LANGUAGE ACCESS MULTICULTURAL PEOPLE LLC | SAINT LOUIS, MO | Southern Bank |
| $1–2 million | LARKEN LOGISTICS LLC | SAINT LOUIS, MO | Commerce Bank |
| $1–2 million | LARUS CORPORATION | SAINT LOUIS, MO | First Bank |
| $150,000–350,000 | LASAK, LLC | SAINT LOUIS, MO | BMO Bank National Association |
| $150,000–350,000 | LASCO FOODS, INC. | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $350,000–1 million | LASHBACK, LLC | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $1–2 million | LASHLY & BAER, PC | SAINT LOUIS, MO | St. Louis Bank |
| $350,000–1 million | LAUREL HOTEL LANDLORD, LLC | SAINT LOUIS, MO | Busey Bank |
| $150,000–350,000 | LAURIE'S SHOE CENTER, INC | SAINT LOUIS, MO | Midwest BankCentre |
| $150,000–350,000 | LAWLOR CORPORATION | SAINT LOUIS, MO | Commerce Bank |
| $350,000–1 million | LAWRENCE FABRIC STRUCTURES, INC. | SAINT LOUIS, MO | Busey Bank |
| $2–5 million | LAWRENCE GROUP PEOPLE LLC | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $350,000–1 million | LAWSON SCREEN PRODUCTS, INC | SAINT LOUIS, MO | Carrollton Bank |
| $2–5 million | LC CORPORATE LLC | SAINT LOUIS, MO | UMB Bank, National Association |
| $1–2 million | LCP CUPPLES SPE, LLC | SAINT LOUIS, MO | Triad Bank |
| $1–2 million | LCP HIGHLAND SPE, LLC | SAINT LOUIS, MO | Triad Bank |
| $150,000–350,000 | LEADERSHIP ALLIANCE INC | SAINT LOUIS, MO | Royal Banks of Missouri |
| $350,000–1 million | LEGAL SERVICES OF EASTERN MISSOURI, INC | SAINT LOUIS, MO | Commerce Bank |
| $150,000–350,000 | LEMAY CHILD AND FAMILY CENTER | SAINT LOUIS, MO | Midwest BankCentre |
| $350,000–1 million | LEMAY CONCRETE BLOCK CO. | SAINT LOUIS, MO | Midwest BankCentre |
| $150,000–350,000 | LENNOX SUITES, LLC | SAINT LOUIS, MO | Triad Bank |
| $150,000–350,000 | LENS AUTO REPAIR INC | SAINT LOUIS, MO | Simmons Bank |
| $350,000–1 million | LERITZ CONTRACTING, INC. | SAINT LOUIS, MO | The Central Trust Bank |
| $150,000–350,000 | LES VETS ENTERPRISES, LLC | SAINT LOUIS, MO | Bank of America, National Association |
| $150,000–350,000 | LESTERS LLC | SAINT LOUIS, MO | Midland States Bank |
| $150,000–350,000 | LET'S EAT!, INC. | SAINT LOUIS, MO | Midwest Regional Bank |
| $150,000–350,000 | LEWIS & CLARK EQUITY PARTNERS, LLC | SAINT LOUIS, MO | St. Louis Bank |
| $2–5 million | LEWIS RICE, LLC | SAINT LOUIS, MO | Banterra Bank |
| $150,000–350,000 | LEXICON CONSTRUCTION, INC. | SAINT LOUIS, MO | Bank of Washington |
| $350,000–1 million | LFI STAFFING INC | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $150,000–350,000 | LGIA BUNTING, LLC | SAINT LOUIS, MO | Town & Country Bank |
| $150,000–350,000 | LIFECARE MISSOURI, INC. | SAINT LOUIS, MO | Cross River Bank |
| $150,000–350,000 | LIFETIME ROOFING & RENOVATION, LLC | SAINT LOUIS, MO | Midwest Regional Bank |
| $1–2 million | LIFT FOR LIFE ACADEMY INC. | SAINT LOUIS, MO | St. Louis Bank |
| $150,000–350,000 | LIFT TRUCK LEASE & SERVICE | SAINT LOUIS, MO | UMB Bank, National Association |
| $150,000–350,000 | LIGHTING SERVICE, INC. | SAINT LOUIS, MO | Commercial Bank |
| $150,000–350,000 | LILAR CORPORATION | SAINT LOUIS, MO | UMB Bank, National Association |
| $150,000–350,000 | LINDBERGH PROPERTIES CONSTRUCTION, INC. | SAINT LOUIS, MO | Triad Bank |
| $150,000–350,000 | LINDBERGH WATERPROOFING, INC. | SAINT LOUIS, MO | St. Johns Bank and Trust Company |
| $350,000–1 million | LION PETROLEUM INC | SAINT LOUIS, MO | Triad Bank |
| $2–5 million | LIONMARK CONSTRUCTION COMPANIES LLC | SAINT LOUIS, MO | Cass Commercial Bank |
| $150,000–350,000 | LIPIC'S INC. | SAINT LOUIS, MO | Midwest BankCentre |
| $150,000–350,000 | LISTON ENTERPRISES INC DBA SEAMUS MCDANIELS | SAINT LOUIS, MO | Lindell Bank & Trust Company |
| $350,000–1 million | LIVE BETTER NOW, INC. | SAINT LOUIS, MO | BMO Bank National Association |
| $5–10 million | LIVE LEARNING TECHNOLOGIES LLC | SAINT LOUIS, MO | Commerce Bank |
| $150,000–350,000 | LJB GROUP LTD | SAINT LOUIS, MO | First Bank of the Lake |
| $350,000–1 million | LL HISTORIC LLC | SAINT LOUIS, MO | Carrollton Bank |
| $350,000–1 million | LOCKERDOME, INC. | SAINT LOUIS, MO | Busey Bank |
| $350,000–1 million | LODGING/HOSPITALITY MANAGEMENT CORPORATION | SAINT LOUIS, MO | Bank of Washington |
| $2–5 million | LOHR DISTRIBUTING CO INC | SAINT LOUIS, MO | United Bank of Union |
| $150,000–350,000 | LOLA & PENELOPE'S, INC. | SAINT LOUIS, MO | Carrollton Bank |
| $350,000–1 million | LOMB, INC. | SAINT LOUIS, MO | St. Johns Bank and Trust Company |
| $150,000–350,000 | LOOP HOTELS, LLC | SAINT LOUIS, MO | The Central Trust Bank |
| $350,000–1 million | LOPATA, FLEGEL & COMPANY LLP | SAINT LOUIS, MO | First Bank |
| $1–2 million | LOU FUSZ COMPANY OF KIRKWOOD INC | SAINT LOUIS, MO | Simmons Bank |
| $350,000–1 million | LOUIS G CHIODINI, INC | SAINT LOUIS, MO | UMB Bank, National Association |
| $150,000–350,000 | LOUIS H BOPP INC | SAINT LOUIS, MO | Commerce Bank |
| $1–2 million | LOWE AUTOMOTIVE WAREHOUSE, INC. | SAINT LOUIS, MO | BMO Bank National Association |
| $350,000–1 million | LOY-LANGE BOX COMPANY | SAINT LOUIS, MO | Newtek Small Business Finance, Inc. |
| $150,000–350,000 | LOYOLA ACADEMY OF ST. LOUIS | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $2–5 million | LTI TRUCKING SERVICES, INC. | SAINT LOUIS, MO | Peoples National Bank, National Association |
| $350,000–1 million | LUGANO2, LLC | SAINT LOUIS, MO | CNB Bank and Trust, National Association |