| $350,000–1 million | NATIONAL VINEGAR CO. | SAINT LOUIS, MO | Commerce Bank |
| $350,000–1 million | NAUFEL INC | SAINT LOUIS, MO | Commerce Bank |
| $350,000–1 million | 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 | First Mid Bank and Trust National Association |
| $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 |
| $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 |
| $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 | The Central Trust Bank |
| $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 | NORTHG LLC | SAINT LOUIS, MO | Bank of Washington |
| $1–2 million | NORTHVIEW VILLAGE, INC. | SAINT LOUIS, MO | Valley National Bank |
| $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 | 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 | The Central Trust Bank |
| $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 |
| $350,000–1 million | OASIS DIGITAL SOLUTIONS INC. | SAINT LOUIS, MO | St. Louis Bank |
| $150,000–350,000 | OBAX INFRASTRUCTURES, LLC | SAINT LOUIS, MO | U.S. Bank, National Association |
| $2–5 million | OBJECT COMPUTING, INC. | SAINT LOUIS, MO | American Bank of Freedom |
| $350,000–1 million | OBSTETRICAL ANESTHESIA ASSOCIATES, INC. | SAINT LOUIS, MO | Commerce Bank |
| $350,000–1 million | OCELOT CONSULTING LLC | SAINT LOUIS, MO | Carrollton Bank |
| $350,000–1 million | OCULUS INC | SAINT LOUIS, MO | UMB Bank, National Association |
| $1–2 million | OFFICE ESSENTIALS INC | SAINT LOUIS, MO | First Bank |
| $150,000–350,000 | OHLENDORF COMPANY | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $2–5 million | OHM CONCESSION GROUP LLC | SAINT LOUIS, MO | CNB Bank and Trust, National Association |
| $150,000–350,000 | OK NOVELTY COMPANY INC. | SAINT LOUIS, MO | St. Johns Bank and Trust Company |
| $150,000–350,000 | OLD WORLD ROOFING COMPANY LLC | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $150,000–350,000 | OLIVE STREET SAINT LOUIS LLC | SAINT LOUIS, MO | Ameris Bank |
| $150,000–350,000 | OLIVE SUPERMARKET INC | SAINT LOUIS, MO | The Bank of Houston |
| $150,000–350,000 | OLIVE-HANLEY, INC. | SAINT LOUIS, MO | Simmons Bank |
| $350,000–1 million | OLYMPUS PR LLC | SAINT LOUIS, MO | Carrollton Bank |
| $350,000–1 million | OMEGA PARTNERS III, LLC | SAINT LOUIS, MO | UMB Bank, National Association |
| $150,000–350,000 | OMNISKOPE INC | SAINT LOUIS, MO | Bank of America, National Association |
| $350,000–1 million | ONDER LAW LLC | SAINT LOUIS, MO | FinWise Bank |
| $150,000–350,000 | ONE HOUR VALET INC | SAINT LOUIS, MO | First Bank |
| $150,000–350,000 | ONE MCKNIGHT PLACE ADMINISTRATION | SAINT LOUIS, MO | Midland States Bank |
| $350,000–1 million | ONI-LION FORGE PUBLISHING GROUP, LLC | SAINT LOUIS, MO | Bank of Washington |
| $350,000–1 million | OPERA HOUSE OPERATOR, LLC | SAINT LOUIS, MO | Busey Bank |
| $350,000–1 million | OPERA THEATRE OF SAINT LOUIS | SAINT LOUIS, MO | Commerce Bank |
| $150,000–350,000 | OPHTHALMIC PLASTIC AND COSMETIC SURGERY, INC. | SAINT LOUIS, MO | Montgomery Bank |
| $150,000–350,000 | OPHTHALMOLOGY WEST INC | SAINT LOUIS, MO | Midland States Bank |
| $150,000–350,000 | ORLANDO BANQUETS INC | SAINT LOUIS, MO | Midwest BankCentre |
| $150,000–350,000 | ORTHOPEDIC AND SPINE INSTITUTE OF ST. LOUIS, LLC | SAINT LOUIS, MO | The Central Trust Bank |
| $350,000–1 million | ORTHOPEDIC ASSOCIATES, LLC | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $350,000–1 million | ORTHOPEDIC SPECIALISTS, P.C. | SAINT LOUIS, MO | BMO Bank National Association |
| $350,000–1 million | ORTHOTIC & PROSTHETIC LAB INC | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $1–2 million | OSBORN & BARR COMMUNICATIONS, INC | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $150,000–350,000 | OTTOLINO WINTERS HUEBNER INC | SAINT LOUIS, MO | Carrollton Bank |
| $150,000–350,000 | OUR LADY OF GUADALUPE | SAINT LOUIS, MO | UMB Bank, National Association |
| $150,000–350,000 | OUR LADY OF LOURDES CATHOLIC CHURCH - UNIVERSITY CITY | SAINT LOUIS, MO | Midwest BankCentre |
| $150,000–350,000 | OUR LADY'S INN | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $150,000–350,000 | OUTDOOR LIVING ENTERPRISES INC. | SAINT LOUIS, MO | CNB Bank and Trust, National Association |
| $350,000–1 million | OUTFORDELIVERY LLC | SAINT LOUIS, MO | First Bank |
| $2–5 million | OVATION HOLDINGS, INC. | SAINT LOUIS, MO | Associated Bank, National Association |
| $150,000–350,000 | OZARK BUILDING MATERIALS | SAINT LOUIS, MO | UMB Bank, National Association |
| $150,000–350,000 | P R ENTERPRISE INC | SAINT LOUIS, MO | Commerce Bank |
| $350,000–1 million | P&A DRYWALL SUPPLY, INCORPORATED | SAINT LOUIS, MO | First Mid Bank & Trust, National Association |