| $150,000–350,000 | JUNIOR ACHIEVEMENT OF OKLAHOMA INC | TULSA, OK | Arvest Bank |
| $350,000–1 million | JUSTIN THOMPSON CONSULTING, L.L.C. | TULSA, OK | Triad Bank, National Association |
| $150,000–350,000 | K-T ENTERPRISES, INC. | TULSA, OK | Regent Bank |
| $150,000–350,000 | KAHAN & ASSOCIATES, INC | TULSA, OK | Triad Bank, National Association |
| $350,000–1 million | KAIROS CARE, INC | TULSA, OK | BOKF, National Association |
| $150,000–350,000 | KAROLL MARTIN PAINT & BODY SHO | TULSA, OK | Security Bank |
| $150,000–350,000 | KEITH & ASSOCIATES INC | TULSA, OK | MidFirst Bank |
| $1–2 million | KENCO INTERNATIONAL INC | TULSA, OK | First Oklahoma Bank |
| $2–5 million | KFM ENTERPRISES, LLC | TULSA, OK | Mabrey Bank |
| $150,000–350,000 | KHEZRI BROTHERS, INC | TULSA, OK | BancFirst |
| $350,000–1 million | KIPP TULSA ACADEMY COLLEGE PREP INC. | TULSA, OK | BOKF, National Association |
| $350,000–1 million | KIRK OF THE HILLS CORPORATION | TULSA, OK | Arvest Bank |
| $150,000–350,000 | KIRKPATRICK & LAI DDS, INC, PC | TULSA, OK | WeStreet Federal Credit Union |
| $350,000–1 million | KIVELL, RAYMENT AND FRANCIS, P. C. | TULSA, OK | Triad Bank, National Association |
| $1–2 million | KKT ARCHITECTS, INC | TULSA, OK | Vast Bank, National Association |
| $150,000–350,000 | KRUSE & ASSOCIATES, INC., KRUSE STAFFING, INC & KRUSE INTERN | TULSA, OK | Security Bank |
| $350,000–1 million | KSQ ARCHITECTS, PC | TULSA, OK | Vast Bank, National Association |
| $1–2 million | KSW OILFIELD RENTAL, LLC | TULSA, OK | Gulf Capital Bank |
| $1–2 million | KTAK CORPORATION I | TULSA, OK | American Bank and Trust Company |
| $1–2 million | KYLE'S APPLIANCE REPAIR | TULSA, OK | FNB Coweta |
| $150,000–350,000 | L A KING, LLC | TULSA, OK | BancFirst |
| $350,000–1 million | L&M OFFICE FURNITURE, LLC | TULSA, OK | SpiritBank |
| $150,000–350,000 | LA BELLA VITA SPA AND SALON, LLC | TULSA, OK | Regent Bank |
| $150,000–350,000 | LA UNION 7 LLC | TULSA, OK | BancFirst |
| $150,000–350,000 | LA UNION 8 LLC | TULSA, OK | BancFirst |
| $150,000–350,000 | LA UNION DOS, INC | TULSA, OK | BancFirst |
| $150,000–350,000 | LABORATORY LOGISTIC SERVICES LLC | TULSA, OK | Regent Bank |
| $350,000–1 million | LAMB MANAGEMENT COMPANY, LLC | TULSA, OK | BancFirst |
| $350,000–1 million | LAND ROVER TULSA, LLC | TULSA, OK | BancFirst |
| $150,000–350,000 | LANDES INSURANCE AGENCY, INC. | TULSA, OK | RCB Bank |
| $150,000–350,000 | LANGDON PUBLISHING CO INC. | TULSA, OK | First Oklahoma Bank |
| $150,000–350,000 | LANNA INC | TULSA, OK | The Exchange Bank |
| $350,000–1 million | LARRY BREWER DENTAL LAB INC. | TULSA, OK | BancFirst |
| $150,000–350,000 | LARRY C KESTER DBA ARCHITECTS COLLECTIVE | TULSA, OK | Grand Bank |
| $150,000–350,000 | LAS AMERICAS SUPERMERCADO #2, INC | TULSA, OK | Security Bank |
| $150,000–350,000 | LAS AMERICAS SUPERMERCADO #4, INC. | TULSA, OK | Security Bank |
| $150,000–350,000 | LAS AMERICAS SUPERRMERCADO #3, INC. | TULSA, OK | Security Bank |
| $350,000–1 million | LASER GROUP, L.L.C. | TULSA, OK | Security Bank |
| $350,000–1 million | LASER SPECIALTIES, INC. | TULSA, OK | SpiritBank |
| $350,000–1 million | LATHAM, STEELE, LEHMAN, KEELE, RATCLIFF, FREIJE & CARTER, PC | TULSA, OK | Firstar Bank |
| $5–10 million | LATSHAW DRILLING COMPANY, LLC | TULSA, OK | Simmons Bank |
| $350,000–1 million | LAYCO, INC. | TULSA, OK | Regent Bank |
| $150,000–350,000 | LAYSON ENTERPRISES, INC. | TULSA, OK | Grand Bank |
| $150,000–350,000 | LEE & BROWNE CONSULTING ENGINEERS INC | TULSA, OK | Arvest Bank |
| $350,000–1 million | LEE HOLDING COMPANY, LLC | TULSA, OK | Commerce Bank |
| $1–2 million | LEINBACH COMPANY MANAGEMENT | TULSA, OK | BOKF, National Association |
| $350,000–1 million | LEISURE VILLAGE HEALTH CARE, LLC | TULSA, OK | BOKF, National Association |
| $350,000–1 million | LEKTRON LED TECHNOLOGIES, LLC | TULSA, OK | The First National Bank and Trust Company of Broken Arrow |
| $350,000–1 million | LEVINSON, SMITH & HUFFMAN, P.C. | TULSA, OK | Bank 7 |
| $150,000–350,000 | LEWIS ROOFING & CONSTRUCTION LLC | TULSA, OK | Arvest Bank |
| $1–2 million | LEXUS OF TULSA | TULSA, OK | BancFirst |
| $150,000–350,000 | LIESURE HOSPITALITY MANAGEMENT, INC. | TULSA, OK | First Bank of Owasso |
| $350,000–1 million | LIFE PACE, INC | TULSA, OK | BancFirst |
| $350,000–1 million | LIFE SENIOR SERVICES, INC | TULSA, OK | BancFirst |
| $1–2 million | LIGHTHOUSE ELECTRIC LLC | TULSA, OK | BancFirst |
| $1–2 million | LIMCO AIREPAIR INC | TULSA, OK | Valley National Bank |
| $350,000–1 million | LITTLE LIGHTHOUSE INC | TULSA, OK | Regent Bank |
| $150,000–350,000 | LITTLE MOUNTAIN PRODUCTION INC | TULSA, OK | First Oklahoma Bank |
| $350,000–1 million | LITTLEFIELD, INC | TULSA, OK | BOKF, National Association |
| $150,000–350,000 | LOBECK TAYLOR FAMILY FOUNDATION | TULSA, OK | Vast Bank, National Association |
| $150,000–350,000 | LOGO STAFFING INTERNATIONAL, INC. | TULSA, OK | RCB Bank |
| $350,000–1 million | LONE STAR SPECIALTY PRODUCTS LLC | TULSA, OK | Commerce Bank |
| $150,000–350,000 | LONE WOLF BANH MI, LLC | TULSA, OK | Security Bank |
| $150,000–350,000 | LUXA ENTERPRISES LLC | TULSA, OK | BOKF, National Association |
| $150,000–350,000 | LYCO MANUFACTURING, INC. | TULSA, OK | Guaranty Bank |
| $1–2 million | LYNCO INC | TULSA, OK | Security Bank |
| $1–2 million | LYNNCO SUPPLY CHAIN SOLUTIONS, INC. | TULSA, OK | BOKF, National Association |
| $350,000–1 million | LYNXSYSTEMS LLC | TULSA, OK | First Oklahoma Bank |
| $350,000–1 million | M&N DEALERSHIPS XI, LLC | TULSA, OK | International Bank of Commerce |
| $150,000–350,000 | M.S. HENRY LAW OFFICE, P.L.L.C. | TULSA, OK | Regent Bank |
| $350,000–1 million | M.W. BEVINS COMPANY | TULSA, OK | Blue Sky Bank |
| $150,000–350,000 | MAC'S HYDRAULIC JACK SERVICE INC | TULSA, OK | Regent Bank |
| $150,000–350,000 | MACHINE TOOL SPECIALTIES, INC | TULSA, OK | Arvest Bank |
| $150,000–350,000 | MAGNOLIA LANE HOLDINGS, LLC | TULSA, OK | BOKF, National Association |
| $350,000–1 million | MAHOGANY, LLC | TULSA, OK | BancFirst |
| $350,000–1 million | MANAGEMENT WORLDWIDE, LLC | TULSA, OK | SpiritBank |
| $1–2 million | MARC MILLER BUICK-GMC, INC. | TULSA, OK | American Bank and Trust Company |
| $1–2 million | MARCO INDUSTRIES, INC. | TULSA, OK | Security Bank |
| $350,000–1 million | MARILYN IHLOFF INC | TULSA, OK | First Oklahoma Bank |
| $150,000–350,000 | MARJO OPERATING MID-CONTINENT LLC | TULSA, OK | BOKF, National Association |
| $350,000–1 million | MARRS ELECTRIC INC | TULSA, OK | Arvest Bank |
| $150,000–350,000 | MARTI LEVINSON, DDS, PLLC | TULSA, OK | Mabrey Bank |
| $150,000–350,000 | MASTER KRAFT TOOLING CORP | TULSA, OK | The Central Trust Bank |
| $150,000–350,000 | MASTER PACKAGING, INC. | TULSA, OK | RCB Bank |
| $150,000–350,000 | MATLOCK SECURITY SERVICES, INC. | TULSA, OK | Security Bank |
| $150,000–350,000 | MATRIX ARCHITECTS ENGINEERS PLANNERS, INC. | TULSA, OK | Arvest Bank |
| $150,000–350,000 | MATRIX PROVIDER SOLUTIONS, LLC | TULSA, OK | SpiritBank |
| $350,000–1 million | MATTSCO SUPPLY COMPANY | TULSA, OK | Arvest Bank |
| $350,000–1 million | MAXWELL SUPPLY OF TULSA, INC. | TULSA, OK | BOKF, National Association |
| $350,000–1 million | MAYO ABC LLC | TULSA, OK | International Bank of Commerce |
| $5–10 million | MAZZIO'S LLC | TULSA, OK | Arvest Bank |
| $150,000–350,000 | MCDANIEL ACORD & LYTLE PLLC | TULSA, OK | Commerce Bank |
| $5–10 million | MCELROY MANUFACTURING INC | TULSA, OK | Mabrey Bank |
| $150,000–350,000 | MCGILLS 61ST, INC. | TULSA, OK | Mabrey Bank |
| $350,000–1 million | MCGRAW DAVISSON STEWART, LLC | TULSA, OK | First Oklahoma Bank |
| $350,000–1 million | MCGUIRE BROTHERS CONSTRUCTION, INC | TULSA, OK | SpiritBank |
| $150,000–350,000 | MCGUIRE BROTHERS, LLC | TULSA, OK | SpiritBank |
| $150,000–350,000 | MCI DIAGNOSTIC CENTER, LLC | TULSA, OK | BOKF, National Association |
| $5–10 million | MCINTOSH CORPORATION | TULSA, OK | Arvest Bank |
| $2–5 million | MCNELLIE'S GROUP LLC | TULSA, OK | Prosperity Bank |