| $150,000–350,000 | SCOTT MANUFACTURING OF KENTUCKY, LLC | OKLAHOMA CITY, OK | Fifth Third Bank |
| $150,000–350,000 | SCOVIL & SIDES HARDWARE COMPANY | OKLAHOMA CITY, OK | MidFirst Bank |
| $150,000–350,000 | SECURITY OPTIONS, LLC | OKLAHOMA CITY, OK | First Fidelity Bank |
| $150,000–350,000 | SEED STATION LLC | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | SELECT COATINGS, INC | OKLAHOMA CITY, OK | The First National Bank and Trust Co, Chickasha, Oklahoma |
| $150,000–350,000 | SELECT MEDICAL CARE | OKLAHOMA CITY, OK | MidFirst Bank |
| $150,000–350,000 | SELECT OPERATIONS OF QUAIL SPRINGS LLC | OKLAHOMA CITY, OK | Simmons Bank |
| $150,000–350,000 | SELF ENTERPRISES, LLC | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | SENIOR HOMECARE OF OKLAHOMA LLC | OKLAHOMA CITY, OK | First Liberty Bank |
| $150,000–350,000 | SEQUOYAH COMMUNICATIONS, INC. | OKLAHOMA CITY, OK | Kirkpatrick Bank |
| $350,000–1 million | SESSION TRUCKING LLC | OKLAHOMA CITY, OK | Kabbage, Inc. |
| $350,000–1 million | SEWELL BROTHERS INC | OKLAHOMA CITY, OK | Bank of Western Oklahoma |
| $1–2 million | SHEBESTER-BECHTEL, INC. | OKLAHOMA CITY, OK | RCB Bank |
| $350,000–1 million | SHELL CONSTRUCTION COMPANY, INC. | OKLAHOMA CITY, OK | Prosperity Bank |
| $150,000–350,000 | SHEPHERD APPRAISAL SERVICES, L.L.C | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | SHOEVALDOC CONSTRUCTION LLC | OKLAHOMA CITY, OK | Oklahoma Heritage Bank |
| $350,000–1 million | SHS MANAGEMENT COMPANY, LLC | OKLAHOMA CITY, OK | First United Bank and Trust Company |
| $150,000–350,000 | SIENA NATURAL RESOURCES | OKLAHOMA CITY, OK | MidFirst Bank |
| $350,000–1 million | SIENNA EXTENDED CARE AND REHAB LLC | OKLAHOMA CITY, OK | Armstrong Bank |
| $350,000–1 million | SIGNATURE LANDSCAPING LLC | OKLAHOMA CITY, OK | First-Citizens Bank & Trust Company |
| $150,000–350,000 | SILVERADO RECONDITIONING SERVICES, INC. | OKLAHOMA CITY, OK | First United Bank and Trust Company |
| $350,000–1 million | SIWA BIOTECH CORP. | OKLAHOMA CITY, OK | First National Bank of Oklahoma |
| $350,000–1 million | SJ INNOVATIONS, LLC | OKLAHOMA CITY, OK | Valor Bank |
| $150,000–350,000 | SKAI LOGISTICS LLC | OKLAHOMA CITY, OK | Kabbage, Inc. |
| $1–2 million | SKIRVIN PARTNERS, LLC | OKLAHOMA CITY, OK | JPMorgan Chase Bank, National Association |
| $150,000–350,000 | SKULL UNLIMITED INTERNATIONAL | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | SKYBRIDGE DEVELOPMENT, LLC | OKLAHOMA CITY, OK | First United Bank and Trust Company |
| $150,000–350,000 | SKYLINE MEDIA GROUP INC | OKLAHOMA CITY, OK | MidFirst Bank |
| $150,000–350,000 | SLEEP ASSOCIATES, LLC | OKLAHOMA CITY, OK | Simmons Bank |
| $150,000–350,000 | SMC CONSULTING ENGINEERS, PC | OKLAHOMA CITY, OK | BancFirst |
| $350,000–1 million | SMICO MANUFACTURING CO., INC. | OKLAHOMA CITY, OK | CrossFirst Bank |
| $150,000–350,000 | SMILE GALAXY PEDIATRIC DENTISTRY, PC | OKLAHOMA CITY, OK | Armstrong Bank |
| $150,000–350,000 | SMILING FACES PEDIATRIC DENTISTRY | OKLAHOMA CITY, OK | MidFirst Bank |
| $150,000–350,000 | SMITH & ASSOCIATES, INC. | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | SMITH & KERNKE FUNERAL DIRECTORS, LLC | OKLAHOMA CITY, OK | BancFirst |
| $350,000–1 million | SMITH & PICKEL CONSTRUCTION, INC. | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | SMITH FARM AND GARDEN, INC | OKLAHOMA CITY, OK | INTRUST Bank, National Association |
| $150,000–350,000 | SMITH LIGHTING SALES, INC. | OKLAHOMA CITY, OK | BancFirst |
| $1–2 million | SMITH ROBERTS BALDISCHWILER, LLC | OKLAHOMA CITY, OK | Valliance Bank |
| $350,000–1 million | SMITH STAFFING INC. | OKLAHOMA CITY, OK | MidFirst Bank |
| $150,000–350,000 | SMITH-ROBERTS LAND SERVICES INC | OKLAHOMA CITY, OK | Kirkpatrick Bank |
| $150,000–350,000 | SMITH-ROBERTS RESOURCES, INC | OKLAHOMA CITY, OK | Valliance Bank |
| $150,000–350,000 | SNIDER INDUSTRIES, LLC | OKLAHOMA CITY, OK | Security State Bank of Oklahoma |
| $350,000–1 million | SOLIS MANAGEMENT COMPANY, INC. | OKLAHOMA CITY, OK | MidFirst Bank |
| $150,000–350,000 | SOLUTIONWARE LTD | OKLAHOMA CITY, OK | BOKF, National Association |
| $150,000–350,000 | SOMMERSET NEIGHBORHOOD | OKLAHOMA CITY, OK | BBVA USA |
| $150,000–350,000 | SOONER MEDICAL STAFFING LLC | OKLAHOMA CITY, OK | International Bank of Commerce |
| $150,000–350,000 | SOONER REAY MIX, LLC | OKLAHOMA CITY, OK | Cross River Bank |
| $150,000–350,000 | SOONER ROLL-OFF INC | OKLAHOMA CITY, OK | First National Bank and Trust Company of Ardmore |
| $150,000–350,000 | SOONER RUBBER PRODUCTS CO. | OKLAHOMA CITY, OK | Frontier State Bank |
| $150,000–350,000 | SOONER SCALE INC | OKLAHOMA CITY, OK | Cross River Bank |
| $150,000–350,000 | SOONER WHOLESALE FLORIST INC | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | SOUTHERN CULINARY, LLC | OKLAHOMA CITY, OK | SpiritBank |
| $2–5 million | SOUTHWEST ELECTRIC CO. | OKLAHOMA CITY, OK | JPMorgan Chase Bank, National Association |
| $150,000–350,000 | SOUTHWEST EYE CLINIC PLLC | OKLAHOMA CITY, OK | BOKF, National Association |
| $350,000–1 million | SOUTHWEST ORTHOPAEDIC SPECIALISTS, P.L.L.C. | OKLAHOMA CITY, OK | MidFirst Bank |
| $150,000–350,000 | SOUTHWEST TAB & COMMISSIONING LLC | OKLAHOMA CITY, OK | Prosperity Bank |
| $350,000–1 million | SOUTHWEST TRAILERS & EQUIPMENT, LLC | OKLAHOMA CITY, OK | BancFirst |
| $350,000–1 million | SOUTHWEST WATER WORKS, LLC | OKLAHOMA CITY, OK | Arvest Bank |
| $150,000–350,000 | SOUTHWESTERN RESTORATION & WATERPROOFING, INC. | OKLAHOMA CITY, OK | MidFirst Bank |
| $350,000–1 million | SOUTHWESTERN ROOFING & METAL | OKLAHOMA CITY, OK | MidFirst Bank |
| $350,000–1 million | SOUTHWESTERN STATIONERY AND BANK SUPPLY, INC. | OKLAHOMA CITY, OK | MidFirst Bank |
| $1–2 million | SP HEALTHCARE MANAGEMENT, LLC | OKLAHOMA CITY, OK | BOKF, National Association |
| $150,000–350,000 | SPAETH INC | OKLAHOMA CITY, OK | Fidelity Bank, National Association |
| $150,000–350,000 | SPARK CREATIVE INC. | OKLAHOMA CITY, OK | Valliance Bank |
| $350,000–1 million | SPECIAL CARE | OKLAHOMA CITY, OK | MidFirst Bank |
| $150,000–350,000 | SPECIALIZED OUTPATIENT SERVICES INC | OKLAHOMA CITY, OK | RCB Bank |
| $150,000–350,000 | SPECIALTY TELECOMMUNICATIONS SERVICES INC LLC | OKLAHOMA CITY, OK | RCB Bank |
| $350,000–1 million | SPECK HOMES INC | OKLAHOMA CITY, OK | Frontier State Bank |
| $150,000–350,000 | SPECTRUM HEALTHCARE SOLUTIONS PLLC | OKLAHOMA CITY, OK | The First State Bank |
| $150,000–350,000 | SPEECH PATHWAY | OKLAHOMA CITY, OK | MidFirst Bank |
| $150,000–350,000 | SPENCER ENTERPRISES, INC. | OKLAHOMA CITY, OK | Cross River Bank |
| $150,000–350,000 | SPICER & SANDBURG, INC. | OKLAHOMA CITY, OK | Kirkpatrick Bank |
| $350,000–1 million | SPIERS NEW TECHNOLOGIES INC | OKLAHOMA CITY, OK | Chickasaw Community Bank |
| $350,000–1 million | SPIKE ENTERPRISE, INC | OKLAHOMA CITY, OK | MidFirst Bank |
| $150,000–350,000 | SPITFIRE ENERGY GROUP LLC | OKLAHOMA CITY, OK | International Bank of Commerce |
| $150,000–350,000 | SPORTING GLOBAL | OKLAHOMA CITY, OK | Watermark Bank |
| $350,000–1 million | SPUR DESIGN, LLC | OKLAHOMA CITY, OK | UMB Bank, National Association |
| $150,000–350,000 | SQUARE DEAL INVESTMENT MANAGEMENT, INC. | OKLAHOMA CITY, OK | MidFirst Bank |
| $150,000–350,000 | SQUARE FOOT HOLDINGS, LLC | OKLAHOMA CITY, OK | CrossFirst Bank |
| $150,000–350,000 | SQUARED AWAY LAWNS LLC | OKLAHOMA CITY, OK | F & M Bank |
| $150,000–350,000 | SS LIFT, LLC | OKLAHOMA CITY, OK | MidFirst Bank |
| $150,000–350,000 | ST JAMES ROMAN CATHOLIC CHURCH | OKLAHOMA CITY, OK | MidFirst Bank |
| $150,000–350,000 | ST PHILIP NERI CATHOLIC CHURCH | OKLAHOMA CITY, OK | FNB Community Bank |
| $350,000–1 million | ST. EUGENE CATHOLIC CHURCH | OKLAHOMA CITY, OK | BOKF, National Association |
| $1–2 million | ST. LUKE'S UNITED METHODIST CHURCH, INC. | OKLAHOMA CITY, OK | MidFirst Bank |
| $150,000–350,000 | STANDARD BUILDING MAINTENANCE LLC | OKLAHOMA CITY, OK | JPMorgan Chase Bank, National Association |
| $150,000–350,000 | STANDARD ROOFING COMPANY, INC. | OKLAHOMA CITY, OK | First Bethany Bank & Trust |
| $350,000–1 million | STANDARD TESTING AND ENGINEERING LLC | OKLAHOMA CITY, OK | BOKF, National Association |
| $150,000–350,000 | STANTECH, LLC | OKLAHOMA CITY, OK | First United Bank and Trust Company |
| $350,000–1 million | STATEWIDE PAINTING CONTRACTORS, INC. | OKLAHOMA CITY, OK | First United Bank and Trust Company |
| $350,000–1 million | STATEWIDE SERVICE CENTER LLC | OKLAHOMA CITY, OK | Cross River Bank |
| $350,000–1 million | STELERA RESTAURANT HOLDINGS, LLC | OKLAHOMA CITY, OK | First Liberty Bank |
| $150,000–350,000 | STELLANOVA OKC CAFES, LLC | OKLAHOMA CITY, OK | MidFirst Bank |
| $150,000–350,000 | STEVE TRUONG, DDS, PLLC | OKLAHOMA CITY, OK | Regent Bank |
| $150,000–350,000 | STEVE'S WHOLESALE DISTRIBUTORS INC | OKLAHOMA CITY, OK | BancFirst |
| $350,000–1 million | STEVEN B. HOMES INC | OKLAHOMA CITY, OK | Kirkpatrick Bank |
| $2–5 million | STEVENS TRUCKING CO | OKLAHOMA CITY, OK | Great Plains National Bank |
| $150,000–350,000 | STILLWELL LIMITED, INC | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | STINER BROTHERS LLC | OKLAHOMA CITY, OK | Arvest Bank |