| $350,000–1 million | MOOSYLVANIA MARKETING, L.C. | SAINT LOUIS, MO | Busey Bank |
| $150,000–350,000 | MORE FOR LESS REMODELING, LLC | SAINT LOUIS, MO | Meramec Valley Bank |
| $350,000–1 million | MOREABLE, LLC | SAINT LOUIS, MO | Midwest BankCentre |
| $150,000–350,000 | MORGAN FORD MASSAGE THERAPY, LLC | SAINT LOUIS, MO | American Bank of Missouri |
| $150,000–350,000 | MORGNER, INC. | SAINT LOUIS, MO | Montgomery Bank |
| $150,000–350,000 | MORICE, LIST & ASSOCIATES, LLC | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $150,000–350,000 | MORROW HOLDINGS INC. | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $150,000–350,000 | MOSAIC FAMILY WEALTH, LLC | SAINT LOUIS, MO | Midland States Bank |
| $1–2 million | MOSBY BUILDING ARTS LTD | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $350,000–1 million | MOTIVATION TECHNOLOGIES, LLC | SAINT LOUIS, MO | Triad Bank |
| $1–2 million | MPAL REAL ESTATE, LLC | SAINT LOUIS, MO | Simmons Bank |
| $150,000–350,000 | MPR SUPPLY COMPANY | SAINT LOUIS, MO | Triad Bank |
| $150,000–350,000 | MTJ CROSSROADS, LLC | SAINT LOUIS, MO | Triad Bank |
| $150,000–350,000 | MTJ CWE, LLC | SAINT LOUIS, MO | Triad Bank |
| $350,000–1 million | MTJ SOULARD, LLC | SAINT LOUIS, MO | Triad Bank |
| $150,000–350,000 | MTJ SOUTH PLAZA, LLC | SAINT LOUIS, MO | Triad Bank |
| $350,000–1 million | MTJ ST. CHARLES, LLC | SAINT LOUIS, MO | Triad Bank |
| $150,000–350,000 | MUELLER INDUSTRIES, LLC | SAINT LOUIS, MO | Meramec Valley Bank |
| $150,000–350,000 | MUELLER MANAGEMENT CO., INC. | SAINT LOUIS, MO | Regions Bank |
| $2–5 million | MUELLER PROST LC | SAINT LOUIS, MO | Carrollton Bank |
| $350,000–1 million | MULTI-AERO INC. | SAINT LOUIS, MO | Bloomsdale Bank |
| $1–2 million | MUNICIPAL THEATRE ASSOCIATION OF ST. LOUIS | SAINT LOUIS, MO | Commerce Bank |
| $150,000–350,000 | MUNSCH OUTDOOR MAINTENANCE COMPANY INC | SAINT LOUIS, MO | Midland States Bank |
| $150,000–350,000 | MURRAY'S TRAVEL CENTRE, LTD | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $350,000–1 million | MUSEUM HOLDINGS, LLC | SAINT LOUIS, MO | Customers Bank |
| $350,000–1 million | MYBRANDPROMO INC. | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $2–5 million | N. B. WEST CONTRACTING CO. | SAINT LOUIS, MO | Commerce Bank |
| $150,000–350,000 | NATIONAL BENEVOLENT ASSOCIATION OF THE CHRISTIAN CHURCH (DISCIPLES OF CHRIST) | SAINT LOUIS, MO | Central Bank of St. Louis |
| $150,000–350,000 | NATIONAL COUNCIL OF JEWISH WOMEN, ST. LOUIS SECTION | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $150,000–350,000 | NATIONAL COUNCIL ON ALCOHOLISM AND DRUG ABUSE - ST. LOUIS AREA INC. | SAINT LOUIS, MO | First Bank |
| $1–2 million | NATIONAL DESIGN BUILD SERVICES LLC | SAINT LOUIS, MO | Busey Bank |
| $1–2 million | NATIONAL HOSPICE MANAGEMENT INC | SAINT LOUIS, MO | Busey Bank |
| $150,000–350,000 | NATIONAL MUSEUM OF TRANSPORTATION | SAINT LOUIS, MO | First Bank |
| $150,000–350,000 | NATIONAL RARITIES, LLC | SAINT LOUIS, MO | Commerce Bank |
| $150,000–350,000 | NATIONAL REAL ESTATE MANAGEMENT CORPORATION | SAINT LOUIS, MO | Central Bank of St. Louis |
| $350,000–1 million | NATIONAL SALES COMPANY | SAINT LOUIS, MO | Busey Bank |
| $350,000–1 million | NATIONAL VINEGAR CO. | SAINT LOUIS, MO | Commerce Bank |
| $350,000–1 million | NAUFEL INC | SAINT LOUIS, MO | Commerce Bank |
| $150,000–350,000 | NAYAK PLASTIC SURGERY, PC | SAINT LOUIS, MO | Lamar Bank and Trust Company |
| $150,000–350,000 | NBO SHOES CHICAGO, LLC | SAINT LOUIS, MO | BancFirst |
| $350,000–1 million | NBO SHOES, LLC | SAINT LOUIS, MO | BancFirst |
| $350,000–1 million | ND&S MANAGEMENT COMPANY, LLC | SAINT LOUIS, MO | Midwest Regional Bank |
| $350,000–1 million | NEFF PRESS INC | SAINT LOUIS, MO | Commerce Bank |
| $2–5 million | NEGWER MATERIALS, INC. | SAINT LOUIS, MO | UMB Bank, National Association |
| $150,000–350,000 | NENNINGER FOODS, LLC | SAINT LOUIS, MO | Busey Bank |
| $350,000–1 million | NEOCOVA CORPORATION | SAINT LOUIS, MO | Coastal Community Bank |
| $1–2 million | NEOLY HOME CARE LLC | SAINT LOUIS, MO | Providence Bank |
| $350,000–1 million | NEPHROLOGY AND HYPERTENSION SPECIALISTS, LLC | SAINT LOUIS, MO | Royal Banks of Missouri |
| $150,000–350,000 | NEPUTE DC WELLNESS CENTER, PC | SAINT LOUIS, MO | Simmons Bank |
| $1–2 million | NERINX HALL | SAINT LOUIS, MO | PNC Bank, National Association |
| $2–5 million | NEUMAYER EQUIPMENT COMPANY | SAINT LOUIS, MO | Busey Bank |
| $350,000–1 million | NEW BEGINNINGS IN-HOME SERVICES, LLC | SAINT LOUIS, MO | Triad Bank |
| $350,000–1 million | NEW CITY FELLOWSHIP OF ST. LOUIS | SAINT LOUIS, MO | Simmons Bank |
| $350,000–1 million | NEWLEAF SYMBIOTICS INC | SAINT LOUIS, MO | Bank of America, National Association |
| $350,000–1 million | NEWSPACE INCORPORATED | SAINT LOUIS, MO | Parkside Financial Bank & Trust |
| $150,000–350,000 | NEXT STEP FOOT AND ANKLE CENTERS, INC. | SAINT LOUIS, MO | Commerce Bank |
| $150,000–350,000 | NEXTEMPS, INC. | SAINT LOUIS, MO | U.S. Bank, National Association |
| $350,000–1 million | NGGLTD, INC | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $150,000–350,000 | NIEBLING AUTO BODY INC | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $2–5 million | NIEHAUS BUILDING SERVICES, LLC. | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $150,000–350,000 | NIGHT LION SECURITY, LLC | SAINT LOUIS, MO | U.S. Bank, National Association |
| $150,000–350,000 | NIKKEN FOODS USA INC | SAINT LOUIS, MO | PNC Bank, National Association |
| $350,000–1 million | NIKSIC AIR CONDITIONING AND HEATING, LLC | SAINT LOUIS, MO | Commerce Bank |
| $150,000–350,000 | NISBET ENTERPRISES LLC | SAINT LOUIS, MO | Midwest BankCentre |
| $1–2 million | NOMAX, INC. | SAINT LOUIS, MO | Midwest BankCentre |
| $150,000–350,000 | NOONLIGHT, INC | SAINT LOUIS, MO | Carrollton Bank |
| $150,000–350,000 | NORBERT A BUTZ INSURANCE AGENCY INC. | SAINT LOUIS, MO | Midwest Regional Bank |
| $350,000–1 million | NORBERT MARKWAY CONSTRUCTION COMPANY | SAINT LOUIS, MO | Central Bank of St. Louis |
| $150,000–350,000 | NORMAL BRAND LLC | SAINT LOUIS, MO | St. Louis Bank |
| $350,000–1 million | NORMANDY HEALTHCARE, LLC | SAINT LOUIS, MO | BOKF, National Association |
| $350,000–1 million | NORTH AMERICAN MONTESSORI-CHILD CARE, INC. | SAINT LOUIS, MO | First Bank |
| $150,000–350,000 | NORTH AMERICAN RURAL HEALTH SERVICES INC | SAINT LOUIS, MO | PNC Bank, National Association |
| $150,000–350,000 | NORTHG LLC | SAINT LOUIS, MO | Bank of Washington |
| $1–2 million | NORTHVIEW VILLAGE, INC. | SAINT LOUIS, MO | Bank Leumi USA |
| $150,000–350,000 | NORWALK VAULT CO OF MISSOURI | SAINT LOUIS, MO | Midwest Regional Bank |
| $350,000–1 million | NORWOOD HILLS CORPORATION | SAINT LOUIS, MO | Triad Bank |
| $150,000–350,000 | NOSER 5 INC | SAINT LOUIS, MO | PNC Bank, National Association |
| $350,000–1 million | NOTION, LLC | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $350,000–1 million | NOTRE DAME HIGH SCHOOL ST. LOUIS | SAINT LOUIS, MO | Midwest BankCentre |
| $150,000–350,000 | NOTTELMANM MUSIC CO. | SAINT LOUIS, MO | Midwest BankCentre |
| $150,000–350,000 | NOVUS DEVELOPMENT COMPANY | SAINT LOUIS, MO | Midland States Bank |
| $150,000–350,000 | NRS PHARMACIES OF INDIANA, LLC | SAINT LOUIS, MO | Midwest Regional Bank |
| $150,000–350,000 | NU WAY CONCRETE FORMS CENTRAL, INC | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $150,000–350,000 | NU WAY CONCRETE FORMS SOUTHEAST LLC | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $150,000–350,000 | NU WAY CONCRETE FORMS TROY, LLC | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $150,000–350,000 | NU WAY CONCRETE FORMS WENTZVILLE,LLC | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $1–2 million | NU WAY HOLDINGS, LLC | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $150,000–350,000 | NU-WAY SERVICE STATION INC. | SAINT LOUIS, MO | FortuneBank |
| $150,000–350,000 | NUMEROF AND ASSOCIATES INC | SAINT LOUIS, MO | U.S. Bank, National Association |
| $350,000–1 million | NURSES EARN IT MEDICAL STAFFING GROUP | SAINT LOUIS, MO | PNC Bank, National Association |
| $350,000–1 million | NURSES FOR NEWBORNS | SAINT LOUIS, MO | Carrollton Bank |
| $350,000–1 million | NUSO LLC | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $350,000–1 million | NUTRIFORMANCE, L.L.C. | SAINT LOUIS, MO | Commerce Bank |
| $150,000–350,000 | O & O HOSPITALITY, LLC | SAINT LOUIS, MO | Busey Bank |
| $150,000–350,000 | O B CLARKS INC | SAINT LOUIS, MO | Central Bank of St. Louis |
| $2–5 million | O'BRIEN INDUSTRIAL HOLDINGS, LLC | SAINT LOUIS, MO | First Bank |
| $150,000–350,000 | O'BRIEN LAW FIRM, P.C. | SAINT LOUIS, MO | Triad Bank |
| $150,000–350,000 | O'CONNOR INSURANCE AGENCY | SAINT LOUIS, MO | Montgomery Bank |
| $350,000–1 million | OAK PARK HEALTHCARE LLC | SAINT LOUIS, MO | Simmons Bank |
| $350,000–1 million | OAKWOOD SYSTEMS GROUP, INC. | SAINT LOUIS, MO | Fountainhead SBF LLC |