| $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 Missouri |
| $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 |
| $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 |
| $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 |
| $350,000–1 million | OPERATION FOOD SEARCH | SAINT LOUIS, MO | PNC Bank, National Association |
| $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 | Central Bank of St. Louis |
| $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 Harris 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 | OVERLAND OPTICAL, INC. | SAINT LOUIS, MO | Stearns 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 |
| $1–2 million | P&P RESTAURANTS INC | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $350,000–1 million | P'SGHETTI'S INC. | SAINT LOUIS, MO | Carrollton Bank |
| $150,000–350,000 | P.J. PRIFTI, INC. | SAINT LOUIS, MO | Commercial Bank |
| $2–5 million | P.M.A. HOLDINGS, LLC | SAINT LOUIS, MO | Midwest BankCentre |
| $150,000–350,000 | P.S. KIDS, LLC | SAINT LOUIS, MO | Montgomery Bank |
| $1–2 million | PACE PROPERTIES, INC | SAINT LOUIS, MO | Central Bank of St. Louis |
| $150,000–350,000 | PACE SOLUTIONS, INC. | SAINT LOUIS, MO | Regions Bank |
| $2–5 million | PACKAGING CONCEPTS INC | SAINT LOUIS, MO | Carrollton Bank |
| $150,000–350,000 | PADBERG, CORRIGAN AND APPELBAUM | SAINT LOUIS, MO | FortuneBank |
| $150,000–350,000 | PAGE LAW LLC | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $350,000–1 million | PAINTSMITHS OF MISSOURI INC | SAINT LOUIS, MO | Saints Avenue Bank |
| $350,000–1 million | PALM INTEGRATIVE HEALTH SAINT LOUIS LLC | SAINT LOUIS, MO | St. Louis Bank |
| $150,000–350,000 | PALM MANAGEMENT COMPANY LLC | SAINT LOUIS, MO | St. Louis Bank |
| $350,000–1 million | PANDJIRIS INC | SAINT LOUIS, MO | Cass Commercial Bank |
| $350,000–1 million | PANGEA, INC. | SAINT LOUIS, MO | Peoples National Bank, National Association |
| $350,000–1 million | PAPPY'S SMOKEHOUSE, LLC | SAINT LOUIS, MO | American Bank of Missouri |
| $150,000–350,000 | PAPPY'S SOUTH, LLC | SAINT LOUIS, MO | American Bank of Missouri |
| $150,000–350,000 | PARADIGM FINANCIAL ADVISORS, L.L.C. | SAINT LOUIS, MO | Central Bank of St. Louis |
| $150,000–350,000 | PARAMOUNT CONVENTION SERVICES, INC | SAINT LOUIS, MO | Busey Bank |
| $1–2 million | PARAQUAD | SAINT LOUIS, MO | Regions Bank |
| $1–2 million | PARC PROVENCE MANAGEMENT LLC | SAINT LOUIS, MO | Midland States Bank |
| $1–2 million | PARENTS AS TEACHERS NATIONAL CENTER, INC | SAINT LOUIS, MO | Commerce Bank |
| $150,000–350,000 | PARTEE ASSOCIATES, L.L.C. DBA PROPERTY ASSESSMENT REVIEW | SAINT LOUIS, MO | Busey Bank |
| $150,000–350,000 | PARTNERSHIP FOR YOUTH INC | SAINT LOUIS, MO | Bank of America, National Association |
| $150,000–350,000 | PARTNERSHIP PROPERTY MANAGEMENT LLC | SAINT LOUIS, MO | Royal Banks of Missouri |
| $150,000–350,000 | PATHOLOGY ASSOCIATES PC | SAINT LOUIS, MO | Great Southern Bank |
| $350,000–1 million | PATRIOT SUNROOMS INC | SAINT LOUIS, MO | Cass Commercial Bank |
| $150,000–350,000 | PAUL ROTTLER, MD, PC | SAINT LOUIS, MO | Commerce Bank |
| $5–10 million | PAULO PRODUCTS COMPANY | SAINT LOUIS, MO | Central Bank of St. Louis |
| $1–2 million | PAYNE FAMILY HOMES, LLC | SAINT LOUIS, MO | Midwest BankCentre |
| $1–2 million | PD INTERNATIONAL HOLDINGS, LLC | SAINT LOUIS, MO | First Merchants Bank |
| $150,000–350,000 | PD MANAGEMENT I, LP | SAINT LOUIS, MO | Enterprise Bank & Trust |
| $350,000–1 million | PEACE HAVEN ASSOCIATION | SAINT LOUIS, MO | Regions Bank |
| $150,000–350,000 | PEACEMAKER, LLC | SAINT LOUIS, MO | First Mid Bank & Trust, National Association |
| $150,000–350,000 | PEARL STREET ELECTRIC, LLC | SAINT LOUIS, MO | Carrollton Bank |
| $2–5 million | PECKHAM GUYTON ALBERS & VIETS INC | SAINT LOUIS, MO | Bank of America, National Association |
| $150,000–350,000 | PEGASUS, INC | SAINT LOUIS, MO | Central Bank of St. Louis |
| $350,000–1 million | PELOPIDAS, L.L.C. | SAINT LOUIS, MO | Fifth Third Bank |
| $5–10 million | PENNEX ALUMINUM COMPANY LLC | SAINT LOUIS, MO | Bank of America, National Association |
| $150,000–350,000 | PENNY WINDOW CO | SAINT LOUIS, MO | PNC Bank, National Association |
| $350,000–1 million | PENTA ENGINEERING CORPORATION | SAINT LOUIS, MO | BMO Harris Bank National Association |
| $150,000–350,000 | PENUEL ENTERPRISES LLC | SAINT LOUIS, MO | Bank of Springfield |
| $150,000–350,000 | PERENNIAL PARTNERS LLC | SAINT LOUIS, MO | First Mid Bank & Trust, National Association |
| $150,000–350,000 | PERFECT HANDS IN HOME HEALTH CARE AND SERVICES INC | SAINT LOUIS, MO | Regions Bank |
| $150,000–350,000 | PERFORMANCE ROOFING INC | SAINT LOUIS, MO | First Bank |
| $150,000–350,000 | PERKCOS UNLIMITED | SAINT LOUIS, MO | Bank of America, National Association |
| $150,000–350,000 | PESTSHIELD, LLC | SAINT LOUIS, MO | Triad Bank |
| $350,000–1 million | PETER & PAUL COMMUNITY SERVICES | SAINT LOUIS, MO | PNC Bank, National Association |
| $350,000–1 million | PETERS-EICHLER MECHANICAL | SAINT LOUIS, MO | Triad Bank |
| $150,000–350,000 | PETRO LOGISTICS, LLC | SAINT LOUIS, MO | The Bank of Houston |
| $350,000–1 million | PG-STL INC. | SAINT LOUIS, MO | Great Southern Bank |
| $150,000–350,000 | PHARMACY FRANCHISEES AND OWNERS ASSOC | SAINT LOUIS, MO | U.S. Bank, National Association |
| $150,000–350,000 | PHARMALOOP LLC | SAINT LOUIS, MO | First Community CU |
| $150,000–350,000 | PHARMAX PARTNERS INC | SAINT LOUIS, MO | First State Community Bank |
| $150,000–350,000 | PHILIBERT SECURITY SYSTEMS INC | SAINT LOUIS, MO | West Community CU |
| $150,000–350,000 | PHILLIPS CONCRETE SERVICES LLC | SAINT LOUIS, MO | U.S. Bank, National Association |
| $150,000–350,000 | PHILLIPS LISTENS, INC. | SAINT LOUIS, MO | Central Bank of Boone County |
| $350,000–1 million | PHOTOS UNLIMITED, LLC | SAINT LOUIS, MO | Commerce Bank |
| $150,000–350,000 | PHS ENTERPRISES, INC. | SAINT LOUIS, MO | Busey Bank |
| $350,000–1 million | PHYSICIAN DATA MANAGEMENT, LLC | SAINT LOUIS, MO | Enterprise Bank & Trust |