| $350,000–1 million | SIEGI'S SAUSAGE HOUSE, INC. | TULSA, OK | First Bank of Owasso |
| $150,000–350,000 | SIGNAL COMMUNICATIONS, INC. | TULSA, OK | Security Bank |
| $150,000–350,000 | SIGNAL FACTORY LLC | TULSA, OK | Vast Bank, National Association |
| $150,000–350,000 | SILEX INTERIORS, INC. | TULSA, OK | Arvest Bank |
| $1–2 million | SILICONE SPECIALTIES, INC. | TULSA, OK | BancFirst |
| $150,000–350,000 | SISEMORE & ASSOCIATES, INC. | TULSA, OK | RCB Bank |
| $150,000–350,000 | SISSEROU'S RESTAURANT LLC | TULSA, OK | Prosperity Bank |
| $150,000–350,000 | SISU ENERGY & ENVIRONMENTAL, LLC | TULSA, OK | RCB Bank |
| $350,000–1 million | SJCO HOLDINGS, LLC | TULSA, OK | Arvest Bank |
| $150,000–350,000 | SKIN CARE INSTITUTE | TULSA, OK | First Oklahoma Bank |
| $350,000–1 million | SKY OF JENKS, LLC | TULSA, OK | MapleMark Bank |
| $150,000–350,000 | SKYFIRE TRUCKING & HEAVY HAUL, INC | TULSA, OK | Arvest Bank |
| $350,000–1 million | SLIM HANEY MACHINING INC | TULSA, OK | BancFirst |
| $350,000–1 million | SMITHEY ENVIRONMENTAL SERVICES, INC. | TULSA, OK | AVB Bank |
| $150,000–350,000 | SMITHS GARDEN EQUIPMENT, INC. | TULSA, OK | BancFirst |
| $150,000–350,000 | SMOLEN LAW, PLLC | TULSA, OK | Cornerstone Bank |
| $150,000–350,000 | SMOLEN, SMOLEN & ROYTMAN, PLLC | TULSA, OK | Firstar Bank |
| $1–2 million | SNELL AUTOMOTIVE LLC | TULSA, OK | JPMorgan Chase Bank, National Association |
| $150,000–350,000 | SNOWS FURNITURE FUNCTION, INC | TULSA, OK | Fountainhead SBF LLC |
| $350,000–1 million | SODER MECHANICAL, INC | TULSA, OK | Security Bank |
| $150,000–350,000 | SOFTOUCH DEVELOPMENT,INC | TULSA, OK | Bank of America, National Association |
| $150,000–350,000 | SOL INDUSTRIES LLC | TULSA, OK | CrossFirst Bank |
| $5–10 million | SOLUTIONS THROUGH INNOVATIVE TECHNOLOGIES, INC. | TULSA, OK | SpiritBank |
| $350,000–1 million | SOONER MANUFACTURING CO INC | TULSA, OK | Security Bank |
| $350,000–1 million | SOUTH LEWIS SH OPCO, LLC | TULSA, OK | Happy State Bank |
| $150,000–350,000 | SOUTH TULSA PEDIATRICS PLLC | TULSA, OK | Prosperity Bank |
| $350,000–1 million | SOUTHERN AGRICULTURE | TULSA, OK | Arvest Bank |
| $150,000–350,000 | SOUTHERN HILLS BAPTIST CHURCH | TULSA, OK | First Oklahoma Bank |
| $350,000–1 million | SOUTHERN HILLS REHAB CENTER LLC | TULSA, OK | Colony Bank |
| $350,000–1 million | SOUTHERN SHEET METAL WORKS, INC. | TULSA, OK | Security Bank |
| $150,000–350,000 | SOUTHSIDE DERMATOLOGY | TULSA, OK | The City National Bank and Trust Company of Lawton, Oklahoma |
| $150,000–350,000 | SOUTHWEST AVIATION SPECIALTIES, LLC | TULSA, OK | Security Bank |
| $150,000–350,000 | SOUTHWEST FILTER COMPANY | TULSA, OK | Mabrey Bank |
| $150,000–350,000 | SOUTHWEST STONE MASONRY LLC | TULSA, OK | Regent Bank |
| $150,000–350,000 | SOUTHWEST STONE, INC. | TULSA, OK | Regent Bank |
| $150,000–350,000 | SOUTHWESTERN BIOMEDICAL ELECTONICS, INC. | TULSA, OK | Prosperity Bank |
| $350,000–1 million | SOUTHWESTERN PAYROLL SERVICE, INC. | TULSA, OK | Prosperity Bank |
| $350,000–1 million | SOUTHWOOD LANDSCAPE & NURSERY CO., INC. | TULSA, OK | BOKF, National Association |
| $150,000–350,000 | SPECIAL EVENT SERVICES, L.L.C. | TULSA, OK | Arvest Bank |
| $150,000–350,000 | SPECIALTY BAKERY OF TULSA, INC. | TULSA, OK | Peoples Bank |
| $350,000–1 million | SPECIALTY MATERIALS & DIGITAL DECORATION, LLC | TULSA, OK | American Heritage Bank |
| $1–2 million | SPECIFIC SYSTEMS, LLC | TULSA, OK | Prosperity Bank |
| $150,000–350,000 | SPECTRUM OF HOPE, LLC | TULSA, OK | First Pryority Bank |
| $2–5 million | SPECTRUM PAINT COMPANY, INC. | TULSA, OK | INTRUST Bank, National Association |
| $1–2 million | SPECTRUM PAINT EAST, LLC | TULSA, OK | INTRUST Bank, National Association |
| $150,000–350,000 | SPLISH SPLASH II LLC | TULSA, OK | Arvest Bank |
| $150,000–350,000 | SPORTS WORLD, INC. | TULSA, OK | Mabrey Bank |
| $150,000–350,000 | SPORTSMITH LLC | TULSA, OK | Simmons Bank |
| $150,000–350,000 | SPRING CREEK NURSERY, INC. | TULSA, OK | Stride Bank, National Association |
| $150,000–350,000 | SPRING TULSA, LLC | TULSA, OK | First Bank of Owasso |
| $1–2 million | SPRINGPOINT TECHNOLOGIES LLC | TULSA, OK | Grand Bank |
| $150,000–350,000 | ST. AUGUSTINE ACADEMY, INC. | TULSA, OK | Arvest Bank |
| $350,000–1 million | STAGHORN PETROLEUM II, LLC | TULSA, OK | BOKF, National Association |
| $350,000–1 million | STAN JOHNSON SERVICES, INC. | TULSA, OK | Arvest Bank |
| $2–5 million | STAND-BY PERSONNEL INC | TULSA, OK | Security Bank |
| $350,000–1 million | STANFIELD & O'DELL PC | TULSA, OK | BOKF, National Association |
| $150,000–350,000 | STANLEYS RENT TO OWN | TULSA, OK | Bank of Commerce |
| $350,000–1 million | STARR OILFIELD SERVICES | TULSA, OK | BancFirst |
| $150,000–350,000 | STATE BEAUTY SUPPLY OF OKLAHOMA INC | TULSA, OK | Arvest Bank |
| $150,000–350,000 | STATEWIDE GENERAL AGENCY | TULSA, OK | Arvest Bank |
| $150,000–350,000 | STAVA BUILDING LLC | TULSA, OK | Regent Bank |
| $150,000–350,000 | STEEL SERVICE OILFIELD TUBULAR, INC. | TULSA, OK | BOKF, National Association |
| $1–2 million | STEELTEK, INC. | TULSA, OK | BOKF, National Association |
| $350,000–1 million | STEIDLEY & NEAL PLLC | TULSA, OK | First National Bank & Trust Company of McAlester |
| $150,000–350,000 | STEPHEN W GROVES MD PC | TULSA, OK | Vast Bank, National Association |
| $2–5 million | STEPHENS FAMILY LIMITED PARTNERSHIP | TULSA, OK | SpiritBank |
| $150,000–350,000 | STEPHENSON OIL COMPANY, INC | TULSA, OK | First Pryority Bank |
| $350,000–1 million | STEVEN L WILSON & ASSOCIATES, CPA'S LLP | TULSA, OK | First Oklahoma Bank |
| $1–2 million | STINNET & ASSOCIATES | TULSA, OK | Arvest Bank |
| $1–2 million | STONEBRIDGE ACQUISITION, INC. | TULSA, OK | Commerce Bank |
| $350,000–1 million | STRATEGIC OPERATING SUPPORT LTD. CO. | TULSA, OK | First Oklahoma Bank |
| $150,000–350,000 | STREET SCHOOL, INC | TULSA, OK | BOKF, National Association |
| $350,000–1 million | STRESSCON, INC | TULSA, OK | BOKF, National Association |
| $350,000–1 million | STRONG RIVER MANAGEMENT LLC | TULSA, OK | RCB Bank |
| $150,000–350,000 | SUBCON INCORPORATED | TULSA, OK | RCB Bank |
| $150,000–350,000 | SUCCESS DEVELOPMENT SERVICES, LLC | TULSA, OK | Central Bank of Oklahoma |
| $150,000–350,000 | SULLIVAN CUSTOM CABINETRY | TULSA, OK | Mabrey Bank |
| $350,000–1 million | SUNSHINE INTERNATIONAL INC. | TULSA, OK | Grand Bank |
| $150,000–350,000 | SUPERIOR BUILDING SERVICES, INC | TULSA, OK | The First National Bank and Trust Company of Broken Arrow |
| $2–5 million | SUPERIOR LINEN SERVICE INC | TULSA, OK | BOKF, National Association |
| $150,000–350,000 | SUPERIOR TERMITE AND PEST CONTROL INC | TULSA, OK | Central Bank of Oklahoma |
| $350,000–1 million | SURGERY INC | TULSA, OK | Triad Bank, National Association |
| $350,000–1 million | SURGICAL ASSOCIATES, INC | TULSA, OK | Arvest Bank |
| $350,000–1 million | SW DRYWALL, LLC | TULSA, OK | Grand Bank |
| $350,000–1 million | SWAGGIN WAGON, INC | TULSA, OK | BancFirst |
| $150,000–350,000 | SWEET ADELINES INTERNATIONAL CORPORATION | TULSA, OK | Bank of America, National Association |
| $150,000–350,000 | SWIFT STAFFING SOLUTIONS, LLC | TULSA, OK | First Oklahoma Bank |
| $350,000–1 million | SYNAPTIC RESOURCES, L.L.C. | TULSA, OK | BancFirst |
| $350,000–1 million | TADPOLE SWIM SCHOOL CORP. | TULSA, OK | BankUnited, National Association |
| $350,000–1 million | TALON COMMERCIAL SERVICES | TULSA, OK | BancFirst |
| $150,000–350,000 | TANK SPECIALITIES, INC. | TULSA, OK | Security Bank |
| $150,000–350,000 | TANNER CONSULTING LLC | TULSA, OK | Mabrey Bank |
| $150,000–350,000 | TASJAK, INC. | TULSA, OK | Security Bank |
| $150,000–350,000 | TASK FORCE STAFFING, LLC | TULSA, OK | Arvest Bank |
| $150,000–350,000 | TAXSEARCH INCORPORATED | TULSA, OK | Mabrey Bank |
| $350,000–1 million | TBC AUTOMOTIVE, INC. | TULSA, OK | Grand Bank |
| $150,000–350,000 | TCB HOSPITALITY, LLC | TULSA, OK | Regent Bank |
| $150,000–350,000 | TE KEI'S LLC | TULSA, OK | Arvest Bank |
| $350,000–1 million | TEAM PROFESSIONAL SERVICES INC. | TULSA, OK | Grand Bank |
| $150,000–350,000 | TECH EVOLUTIONS LLC | TULSA, OK | JPMorgan Chase Bank, National Association |