| $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 | 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 |
| $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 | SKULLS 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 | 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 | 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 |
| $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 |
| $150,000–350,000 | SOLUTIONWARE, LTD | OKLAHOMA CITY, OK | BOKF, National Association |
| $150,000–350,000 | SOMMERSET NEIGHBORHOOD | OKLAHOMA CITY, OK | First Source Federal Credit Union |
| $150,000–350,000 | SOONER MEDICAL STAFFING LLC | OKLAHOMA CITY, OK | International Bank of Commerce |
| $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 WHOLESALE FLORIST, INC | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | SOUTHERN CULINARY, LLC | OKLAHOMA CITY, OK | SpiritBank |
| $150,000–350,000 | SOUTHWEST EYE CLINIC PLLC | OKLAHOMA CITY, OK | BOKF, National Association |
| $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 | 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 | Sovereign Bank |
| $150,000–350,000 | SPICER & SANDBURG, INC. | OKLAHOMA CITY, OK | Kirkpatrick 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 FOOT HOLDINGS, LLC | OKLAHOMA CITY, OK | CrossFirst 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 |
| $150,000–350,000 | ST. ANDREWS COMMUNITY UNITED METHODIST CHURCH | OKLAHOMA CITY, OK | Armstrong 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 |
| $150,000–350,000 | STAPLEGUN DESIGN, LLC | OKLAHOMA CITY, OK | The Citizens Bank of Edmond |
| $350,000–1 million | STATEWIDE PAINTING CONTRACTORS, INC. | OKLAHOMA CITY, OK | First United Bank and Trust Company |
| $350,000–1 million | STELERA RESTAURANT HOLDINGS, LLC | OKLAHOMA CITY, OK | First Liberty Bank |
| $150,000–350,000 | STEVE H. TRUONG DDS PLLC | OKLAHOMA CITY, OK | Itria Ventures LLC |
| $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 |
| $350,000–1 million | STEVENS STAFFING SOLUTIONS, LLC | OKLAHOMA CITY, OK | Great Plains National 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 |
| $150,000–350,000 | STOCKMAN-OKLA. LIVESTOCK MARKETING INC | OKLAHOMA CITY, OK | Shamrock Bank, National Association |
| $350,000–1 million | STOUT TRANSPORTATION, LLC | OKLAHOMA CITY, OK | MidFirst Bank |
| $350,000–1 million | STRAIGHTAWAY DELIVERY, LLC | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | STRATA LEADERSHIP, L.L.C. | OKLAHOMA CITY, OK | First United Bank and Trust Company |
| $1–2 million | STREETS, LLC | OKLAHOMA CITY, OK | Cowboy Bank |
| $350,000–1 million | STROINGPOINT AUTOGROUP LLC | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | STUMP AND ASSOCIATES, P.C. | OKLAHOMA CITY, OK | First Bethany Bank & Trust |
| $350,000–1 million | SUBURBAN CABINET SHOP, LLC | OKLAHOMA CITY, OK | First Security Bank and Trust Company |
| $150,000–350,000 | SUBURBAN CONTEMPORARY SHOP, LLC | OKLAHOMA CITY, OK | JPMorgan Chase Bank, National Association |
| $150,000–350,000 | SUENOS OKLAHOMA CITY II, LLC | OKLAHOMA CITY, OK | Prism Bank |
| $150,000–350,000 | SUENOS OKLAHOMA CITY, LLC | OKLAHOMA CITY, OK | Prism Bank |
| $150,000–350,000 | SUMMIT HOLDINGS, INC. | OKLAHOMA CITY, OK | InterBank |
| $150,000–350,000 | SUMMIT MACHINE TOOL LLC | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | SUMMIT SUPPLY INC. | OKLAHOMA CITY, OK | Kirkpatrick Bank |
| $2–5 million | SUMMIT TRUCK GROUP OF OKLAHOMA, LLC | OKLAHOMA CITY, OK | BMO Bank National Association |
| $1–2 million | SUNBEAM FAMILY SERVICES, INC. | OKLAHOMA CITY, OK | MidFirst Bank |
| $350,000–1 million | SUNBELT OILFIELD SUPPLY, INC | OKLAHOMA CITY, OK | BOKF, National Association |
| $150,000–350,000 | SUPBROTH, LLC | OKLAHOMA CITY, OK | Great Plains National Bank |
| $150,000–350,000 | SUPERIOR FENCE CONSTRUCTION,INC. | OKLAHOMA CITY, OK | First United Bank and Trust Company |
| $350,000–1 million | SUPERIOR LIVESTOCK AUCTION, LLC | OKLAHOMA CITY, OK | First United Bank and Trust Company |
| $150,000–350,000 | SUPERIOR NEON SIGN COMPANY | OKLAHOMA CITY, OK | NBC Oklahoma |
| $1–2 million | SUPERIOR STAFFING INC. | OKLAHOMA CITY, OK | Legacy Bank |
| $150,000–350,000 | SUPERIOR SUPERVAKS LLC | OKLAHOMA CITY, OK | NBC Oklahoma |
| $350,000–1 million | SURFACE MOUNT DEPOT INC. | OKLAHOMA CITY, OK | Kirkpatrick Bank |
| $350,000–1 million | SURGERY CENTER OF OKLAHOMA, LP | OKLAHOMA CITY, OK | BancFirst |
| $1–2 million | SURGICAL HOSPITAL OF OKLAHOMA, L.L.C. | OKLAHOMA CITY, OK | Bank 7 |
| $1–2 million | SWADLEY'S SMOKED MEATS INC. | OKLAHOMA CITY, OK | RCB Bank |
| $150,000–350,000 | SWALK OPERATIONS, LLC | OKLAHOMA CITY, OK | Centennial Bank |
| $150,000–350,000 | SWANDA BROTHERS INC | OKLAHOMA CITY, OK | Prosperity Bank |