| $150,000–350,000 | KERN MEAT CO., INC. | SAINT LOUIS, MO | St. Louis Bank |
| $150,000–350,000 | KESSLER CONTAINERS LTD | SAINT LOUIS, MO | Bank of America, National Association |
| $150,000–350,000 | KEY MANAGEMENT COMPANY OF MISSOURI | SAINT LOUIS, MO | Carrollton Bank |
| $1–2 million | KEYSER ENTERPRISES 1, LP | SAINT LOUIS, MO | Peoples National Bank, National Association |
| $1–2 million | KEYSTONE TEMPORARY ASSIGNMENT GROUP, INC | SAINT LOUIS, MO | Central Bank of St. Louis |
| $150,000–350,000 | KICKING COW PROMOTIONS, INC. | SAINT LOUIS, MO | Justine Petersen Housing & Reinvestment Corporation |
| $150,000–350,000 | KIDS IN THE MIDDLE INC | SAINT LOUIS, MO | PNC Bank, National Association |
| $150,000–350,000 | KIEFER BONFANTI & CO. LLP | SAINT LOUIS, MO | Triad Bank |
| $150,000–350,000 | KIENSTRA 44, LLC | SAINT LOUIS, MO | Great Southern Bank |
| $350,000–1 million | KIENSTRA CO. | SAINT LOUIS, MO | Triad Bank |
| $150,000–350,000 | KIENSTRA CONCRETE, INC. | SAINT LOUIS, MO | Great Southern Bank |
| $150,000–350,000 | KIENSTRA READY MIX OF O'FALLON, INC. | SAINT LOUIS, MO | Triad Bank |
| $150,000–350,000 | KIKU OBATA & COMPANY | SAINT LOUIS, MO | Commerce Bank |
| $150,000–350,000 | KIMMERON INC. | SAINT LOUIS, MO | Midwest Regional Bank |
| $150,000–350,000 | KING FILTRATION TECHNOLOGIES, INC | SAINT LOUIS, MO | Carrollton Bank |
| $350,000–1 million | KINGDOM HOUSE | SAINT LOUIS, MO | Carrollton Bank |
| $150,000–350,000 | KINGSTON DENTAL CENTER RONALD K. GREIF DDS PC | SAINT LOUIS, MO | UMB Bank, National Association |
| $2–5 million | KIPP ST. LOUIS | SAINT LOUIS, MO | Commerce Bank |
| $2–5 million | KIRBERG ROOFING, INC | SAINT LOUIS, MO | UMB Bank, National Association |
| $150,000–350,000 | KIRKWOOD AUTO GLASS, INC. | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $150,000–350,000 | KIRKWOOD HEATING AND AIR CONDITIONING CO., INC. | SAINT LOUIS, MO | UMB Bank, National Association |
| $150,000–350,000 | KIRKWOOD UNITED METHODIST CHURCH | SAINT LOUIS, MO | Commerce Bank |
| $350,000–1 million | KMEIER ROOF SYSTEM, INC | SAINT LOUIS, MO | Meramec Valley Bank |
| $1–2 million | KNOW INK, LLC | SAINT LOUIS, MO | Central Bank of St. Louis |
| $150,000–350,000 | KOBE OF WESTPORT, INC | SAINT LOUIS, MO | RCB Bank |
| $150,000–350,000 | KOCH DEVELOPMENT CO. | SAINT LOUIS, MO | Central Bank of St. Louis |
| $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 | KOVEN TECHNOLOGY, INC. | SAINT LOUIS, MO | Regions Bank |
| $150,000–350,000 | KOWELMAN ENGINEERING, INC. | SAINT LOUIS, MO | BMO Harris 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 | KULLMAN, KLEIN & DIONEDA, PC | SAINT LOUIS, MO | Jefferson Bank and Trust Company |
| $150,000–350,000 | KUPFERER BROS ORNAMENTAL IRON WORKS INC | SAINT LOUIS, MO | Bank of America, National Association |
| $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 | FortuneBank |
| $150,000–350,000 | L&T LANDSCAPE AND TREE LLC | SAINT LOUIS, MO | FortuneBank |
| $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, LLC | SAINT LOUIS, MO | Merchants Bank of Indiana |
| $350,000–1 million | LAFAYETTE PREPARATORY ACADEMY, INC | SAINT LOUIS, MO | Regions Bank |
| $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 | FortuneBank |
| $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 | LASCO FOODS, INC | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $350,000–1 million | LASHBACK, LLC | SAINT LOUIS, MO | First Choice Bank |
| $1–2 million | LASHLY & BAER, PC | SAINT LOUIS, MO | St. Louis Bank |
| $150,000–350,000 | LAUMEIER SCULPTURE PARK | SAINT LOUIS, MO | PNC Bank, National Association |
| $350,000–1 million | LAUREL HOTEL LANDLORD, LLC | SAINT LOUIS, MO | Busey Bank |
| $150,000–350,000 | LAURIE'S SHOE CENTER | 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 | LDR ADMSERVICES, LLC | SAINT LOUIS, MO | Simmons Bank |
| $150,000–350,000 | LEADERSHIP ALLIANCE INC | SAINT LOUIS, MO | Saints Avenue Bank |
| $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 | Central Bank of St. Louis |
| $150,000–350,000 | LES VETS ENTERPRISES, LLC | SAINT LOUIS, MO | Bank of America, National Association |
| $150,000–350,000 | LESS ANNOYING SOFTWARE LLC | SAINT LOUIS, MO | WebBank |
| $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 |