| $2–5 million | MIDCENTRAL ENERGY HOLDINGS LLC | OKLAHOMA CITY, OK | MidFirst Bank |
| $350,000–1 million | MIDSTATE TRAFFIC CONTROL, INC. | OKLAHOMA CITY, OK | MidFirst Bank |
| $150,000–350,000 | MIDWEST CITY FEAST LLC | OKLAHOMA CITY, OK | Security State Bank of Oklahoma |
| $150,000–350,000 | MIDWEST ENGINEERING & TESTING | OKLAHOMA CITY, OK | Valliance Bank |
| $150,000–350,000 | MIDWEST FABRICATORS, LLC | OKLAHOMA CITY, OK | Central Bank of Oklahoma |
| $150,000–350,000 | MIDWEST FLOORING INSTALLATION, LLC | OKLAHOMA CITY, OK | Great Plains National Bank |
| $150,000–350,000 | MIDWEST HOSPITALIST GROUP PLLC | OKLAHOMA CITY, OK | Arvest Bank |
| $350,000–1 million | MIDWEST INSULATION AND MATERIAL LLC | OKLAHOMA CITY, OK | Cross River Bank |
| $150,000–350,000 | MIDWEST NEPHROLOGY GROUP, PLLC | OKLAHOMA CITY, OK | Frontier State Bank |
| $350,000–1 million | MIDWEST WRECKING CO LLC | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | MIKE'S INVESTMENTS L.L.C. | OKLAHOMA CITY, OK | Arvest Bank |
| $350,000–1 million | MILAMAR COATINGS, LLC | OKLAHOMA CITY, OK | BMO Harris Bank National Association |
| $150,000–350,000 | MILES ASSOCIATES INCORPORATED | OKLAHOMA CITY, OK | MidFirst Bank |
| $150,000–350,000 | MILLER ARCHITECTS INC. PC | OKLAHOMA CITY, OK | Chickasaw Community Bank |
| $350,000–1 million | MILLER-TIPPENS CONSTRUCTION COMPANY, LLC | OKLAHOMA CITY, OK | RCB Bank |
| $150,000–350,000 | MINAL HOTELS LLC | OKLAHOMA CITY, OK | High Plains Bank |
| $150,000–350,000 | MINICK MATERIALS COMPANY | OKLAHOMA CITY, OK | Simmons Bank |
| $150,000–350,000 | MIRACLE PRODUCTION, INC. | OKLAHOMA CITY, OK | BancCentral, National Association |
| $150,000–350,000 | MITCHELL COMMUNICATIONS, INC | OKLAHOMA CITY, OK | Kirkpatrick Bank |
| $2–5 million | MITCHELL CONSULTING SERVICES GROUP INC. | OKLAHOMA CITY, OK | The First State Bank |
| $350,000–1 million | MLCV OKLAHOMA, LLC | OKLAHOMA CITY, OK | Woodlands National Bank |
| $150,000–350,000 | MLE SNF OPCO, LLC | OKLAHOMA CITY, OK | Happy State Bank |
| $150,000–350,000 | MMS OKLAHOMA CITY INC | OKLAHOMA CITY, OK | BOKF, National Association |
| $1–2 million | MODULAR SERVICES COMPANY | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | MOLECULERA LABS, INC | OKLAHOMA CITY, OK | BOKF, National Association |
| $350,000–1 million | MOLLMAN WATER CONDITIONING, INC. | OKLAHOMA CITY, OK | BancFirst |
| $350,000–1 million | MONSCIERGE USA, LLC | OKLAHOMA CITY, OK | JPMorgan Chase Bank, National Association |
| $350,000–1 million | MONTE R LEE AND COMPANY | OKLAHOMA CITY, OK | Kirkpatrick Bank |
| $150,000–350,000 | MONTE'S CLEANERS LLC | OKLAHOMA CITY, OK | First National Bank of Oklahoma |
| $350,000–1 million | MOON CHEMICAL PRODUCTS CO | OKLAHOMA CITY, OK | The First State Bank |
| $150,000–350,000 | MORGAN & ASSOCIATES, P.C. | OKLAHOMA CITY, OK | Legacy Bank |
| $350,000–1 million | MOUNT SAINT MARY HIGHSCHOOL | OKLAHOMA CITY, OK | BancFirst |
| $350,000–1 million | MTH RESTAURANTS, LLC | OKLAHOMA CITY, OK | Truist Bank d/b/a Branch Banking & Trust Co |
| $2–5 million | MTM RECOGNITION CORPORATION | OKLAHOMA CITY, OK | BOKF, National Association |
| $150,000–350,000 | MURRPHY PRODUCTS, INC. | OKLAHOMA CITY, OK | BancFirst |
| $2–5 million | MUSTANG FUEL CORPORATION | OKLAHOMA CITY, OK | MidFirst Bank |
| $150,000–350,000 | MYERS ENGINEERING, CONSULTING ENGINEERS, INC | OKLAHOMA CITY, OK | Prime Bank |
| $350,000–1 million | MYRIAD GARDENS FOUNDATION, INC. | OKLAHOMA CITY, OK | BancFirst |
| $1–2 million | N-VEST, LLC | OKLAHOMA CITY, OK | BancFirst |
| $350,000–1 million | NASH CONSTRUCTION COMPANY | OKLAHOMA CITY, OK | Kirkpatrick Bank |
| $350,000–1 million | NATIONAL COWBOY & WESTERN HERITAGE MUSEUM, INC. | OKLAHOMA CITY, OK | BancFirst |
| $2–5 million | NATIONAL LITIGATION LAW GROUP, LLP | OKLAHOMA CITY, OK | Arvest Bank |
| $150,000–350,000 | NATIONAL LIVESTOCK COMMISSION ASSOCIATION | OKLAHOMA CITY, OK | First United Bank and Trust Company |
| $150,000–350,000 | NATIONAL LOAN INVESTORS LP | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | NATIONAL REINING HORSE ASSOCIATION | OKLAHOMA CITY, OK | Arvest Bank |
| $150,000–350,000 | NECO INDUSTRIES INC | OKLAHOMA CITY, OK | First Bethany Bank & Trust |
| $150,000–350,000 | NEEDHAM & ASSOCIATES PLLC | OKLAHOMA CITY, OK | First Fidelity Bank |
| $150,000–350,000 | NEEDHAM ENERGY LAND SERVICES LLC | OKLAHOMA CITY, OK | First Fidelity Bank |
| $150,000–350,000 | NEEHA HOTELS LLC | OKLAHOMA CITY, OK | High Plains Bank |
| $350,000–1 million | NEEL VETERINARIAN HOSPITAL | OKLAHOMA CITY, OK | Bank of Hydro |
| $350,000–1 million | NEESE ENTERPRISES INC | OKLAHOMA CITY, OK | Mabrey Bank |
| $150,000–350,000 | NEIGHBORHOOD HOUSING SERVICES OKLAHOMA CITY, INC. | OKLAHOMA CITY, OK | MidFirst Bank |
| $150,000–350,000 | NEIGHBORHOOD SERVICES ORGANIZATION,INC. | OKLAHOMA CITY, OK | InterBank |
| $350,000–1 million | NELSON INDUSTRIAL SERVICES, INC | OKLAHOMA CITY, OK | Prime Bank |
| $150,000–350,000 | NELSON LAWNS, INC | OKLAHOMA CITY, OK | Kirkpatrick Bank |
| $1–2 million | NEUROSCIENCE SPECIALISTS, PC | OKLAHOMA CITY, OK | First Liberty Bank |
| $150,000–350,000 | NEW CENTURY INVESTMENTS VII, LLC | OKLAHOMA CITY, OK | Legacy Bank |
| $350,000–1 million | NEW DIRECTION HOME DIALYSIS, LLC | OKLAHOMA CITY, OK | Arvest Bank |
| $1–2 million | NEWVIEW OKLAHOMA | OKLAHOMA CITY, OK | MidFirst Bank |
| $150,000–350,000 | NEXSPACES, LLC | OKLAHOMA CITY, OK | First United Bank and Trust Company |
| $150,000–350,000 | NEXTSTREAM HEAVY OIL, LLC | OKLAHOMA CITY, OK | Kirkpatrick Bank |
| $150,000–350,000 | NIEMANN AND ASSOCIATES, LLC | OKLAHOMA CITY, OK | First Liberty Bank |
| $150,000–350,000 | NJOY VISION LLC | OKLAHOMA CITY, OK | JPMorgan Chase Bank, National Association |
| $150,000–350,000 | NKAB LLC | OKLAHOMA CITY, OK | Cross River Bank |
| $150,000–350,000 | NOBEL SYSTEMS, INC. | OKLAHOMA CITY, OK | Prosperity Bank |
| $350,000–1 million | NORTH AMERICAN TIE & TIMBER, LLC | OKLAHOMA CITY, OK | NBC Oklahoma |
| $150,000–350,000 | NORTH CHURCH, INC. | OKLAHOMA CITY, OK | Assemblies of God CU |
| $2–5 million | NORTH OKLAHOMA COUNTY MENTAL HEALTH CENTER | OKLAHOMA CITY, OK | BOKF, National Association |
| $150,000–350,000 | NORTH WINDS LIVING CENTER, INC. | OKLAHOMA CITY, OK | InterBank |
| $350,000–1 million | NORTHWEST BUILDING SUPPLY, INC | OKLAHOMA CITY, OK | MidFirst Bank |
| $150,000–350,000 | NORTHWEST TRANSFORMER CO., INC. | OKLAHOMA CITY, OK | Great Nations Bank |
| $350,000–1 million | O C T EQUIPMENT, INC | OKLAHOMA CITY, OK | Prosperity Bank |
| $150,000–350,000 | O'CONNOR'S LAWN & GARDEN INC. | OKLAHOMA CITY, OK | Prosperity Bank |
| $1–2 million | O&M TB, LLC | OKLAHOMA CITY, OK | Simmons Bank |
| $150,000–350,000 | O'STEEN MEAT SPECIALTIES, INC. | OKLAHOMA CITY, OK | Arvest Bank |
| $350,000–1 million | O2 CONCEPTS, LLC | OKLAHOMA CITY, OK | Vast Bank, National Association |
| $150,000–350,000 | OAKWOOD PROPERTY MANAGEMENT, LLC | OKLAHOMA CITY, OK | First Bethany Bank & Trust |
| $1–2 million | OBJECTSTREAM INC | OKLAHOMA CITY, OK | Bank of America, National Association |
| $150,000–350,000 | OBSTETRICS & GYNECOLOGY SPECIALISTS, INC. | OKLAHOMA CITY, OK | Simmons Bank |
| $150,000–350,000 | OCEAN DENTAL CORPORATE OFFICE, INC. | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | OCEAN DENTAL OF ARKANSAS, PC | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | OCEAN DENTAL OF IOWA, PC | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | OCEAN DENTAL OF TEXAS, PC | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | OCEAN DENTAL, CHAD HOECKER, DDS, PC | OKLAHOMA CITY, OK | BancFirst |
| $350,000–1 million | OCEAN DENTAL, PC | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | OILFIELD SPECIALTY DISTRIBUTORS, INC. | OKLAHOMA CITY, OK | First United Bank and Trust Company |
| $150,000–350,000 | OK FONDUE, LLC | OKLAHOMA CITY, OK | First Oklahoma Bank |
| $150,000–350,000 | OK SUB OF OKC, INC | OKLAHOMA CITY, OK | The First National Bank and Trust Co, Chickasha, Oklahoma |
| $350,000–1 million | OKC AUTO WORKS, LLC | OKLAHOMA CITY, OK | Bank of Hydro |
| $150,000–350,000 | OKC ELECTRICAL CONTRACTORS, INC. | OKLAHOMA CITY, OK | Prosperity Bank |
| $1–2 million | OKC HOTEL VENTURES LLC | OKLAHOMA CITY, OK | MidFirst Bank |
| $350,000–1 million | OKC METRO ALLIANCE | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | OKC SMILES, LLC | OKLAHOMA CITY, OK | First United Bank and Trust Company |
| $350,000–1 million | OKC-OMS HOLDINGS, PLLC | OKLAHOMA CITY, OK | Valliance Bank |
| $350,000–1 million | OKLAHOMA AGENTS ALLIANCE, LLC | OKLAHOMA CITY, OK | The First State Bank |
| $350,000–1 million | OKLAHOMA ALLERGY AND ASTHMA, INC. | OKLAHOMA CITY, OK | MidFirst Bank |
| $350,000–1 million | OKLAHOMA ANNUAL CONFERENCE OF THE UNITED METHODIST CHURCH INC | OKLAHOMA CITY, OK | Prosperity Bank |
| $350,000–1 million | OKLAHOMA AUTO EXCHANGE, LLC | OKLAHOMA CITY, OK | BOKF, National Association |
| $1–2 million | OKLAHOMA BAPTIST HOMES FOR CHILDREN, INC. | OKLAHOMA CITY, OK | BOKF, National Association |
| $350,000–1 million | OKLAHOMA BUILDING SERVICES INC | OKLAHOMA CITY, OK | First Fidelity Bank |