| $350,000–1 million | JANZEN AUTOMOTIVE GROUP INC | STILLWATER, OK | BancFirst |
| $150,000–350,000 | JASON'S DELI | TULSA, OK | BancFirst |
| $350,000–1 million | JB &KL INC. | BROKEN ARROW, OK | BancFirst |
| $150,000–350,000 | JCD GROUP BPFH LLC | Lawton, OK | BancFirst |
| $150,000–350,000 | JCD GROUP BPFH LLC | LAWTON, OK | BancFirst |
| $150,000–350,000 | JCD GROUP LLC | Lawton, OK | BancFirst |
| $150,000–350,000 | JCD GROUP TEMPLE LLC | Temple, TX | BancFirst |
| $150,000–350,000 | JCD GROUP TEMPLE LLC | TEMPLE, TX | BancFirst |
| $150,000–350,000 | JCD GROUP WF LLC | Wichita Falls, TX | BancFirst |
| $150,000–350,000 | JCD GROUP WF LLC | WICHITA FALLS, TX | BancFirst |
| $150,000–350,000 | JENTECH CONSTRUCTION SERVICES LLC | FORT GIBSON, OK | BancFirst |
| $350,000–1 million | JIM GLOVER CDJR, LLC | OWASSO, OK | BancFirst |
| $350,000–1 million | JINNY-ANN #4 CORP | Del City, OK | BancFirst |
| $350,000–1 million | JL DARLING, LLC | TACOMA, WA | BancFirst |
| $150,000–350,000 | JOE'S HOTSHOT & TRUCKING LLC | EL RENO, OK | BancFirst |
| $350,000–1 million | JOHNSONS OF KINGFISHER INC | Kingfisher, OK | BancFirst |
| $350,000–1 million | JOHNSONS OF KINGFISHER, INC | KINGFISHER, OK | BancFirst |
| $150,000–350,000 | JOSEY SKATELAND INC | LEWISVILLE, TX | BancFirst |
| $150,000–350,000 | JRS- MOORE LLC | Moore, OK | BancFirst |
| $150,000–350,000 | JSW PROPERTIES, INC | PONCA CITY, OK | BancFirst |
| $150,000–350,000 | JT PAINT AND DESIGN, LLC | BARTLESVILLE, OK | BancFirst |
| $150,000–350,000 | JTR CONSTRUCTION AND MAINTENANCE LLC | MUSKOGEE, OK | BancFirst |
| $150,000–350,000 | JUST 4 A CHILD, INC. | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | K.B. SAND, INC. | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | KALIDY LLC | EDMOND, OK | BancFirst |
| $350,000–1 million | KALOGRIDIS INTERNATIONAL LTD. | Dallas, TX | BancFirst |
| $350,000–1 million | KALOGRIDIS INTERNATIONAL, LTD | DALLAS, TX | BancFirst |
| $150,000–350,000 | KATIE SENIOR CARE, LLC | NORMAN, OK | BancFirst |
| $150,000–350,000 | KAYSER MECHANICAL INC | LAWTON, OK | BancFirst |
| $150,000–350,000 | KAYSER MECHANICAL INC. | Lawton, OK | BancFirst |
| $150,000–350,000 | KDG AUTOMOTIVE, INC | WAGONER, OK | BancFirst |
| $150,000–350,000 | KELLE OIL COMPANY LLC | BRAMAN, OK | BancFirst |
| $150,000–350,000 | KELLEY JEWELERS LLC | WEATHERFORD, OK | BancFirst |
| $150,000–350,000 | KELLEY JEWELERS LLC | Weatherford, OK | BancFirst |
| $350,000–1 million | KEMPTON GROUP HOLDINGS INC. | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | KERNS CONSTRUCTION INC. | Stillwater, OK | BancFirst |
| $150,000–350,000 | KERNS CONSTRUCTION, INC. | STILLWATER, OK | BancFirst |
| $150,000–350,000 | KERNS READY MIXED CONCRETE INC. | Stillwater, OK | BancFirst |
| $150,000–350,000 | KEYSTONE ENGINEERING AND LAND SURVEYING, INC. | STILLWATER, OK | BancFirst |
| $150,000–350,000 | KHEZRI BROTHERS INC. | Tulsa, OK | BancFirst |
| $150,000–350,000 | KHEZRI BROTHERS, INC | TULSA, OK | BancFirst |
| $150,000–350,000 | KIAMICHI CHEVROLET, INC | BROKEN BOW, OK | BancFirst |
| $1–2 million | KIAMICHI ELECTRIC COOPERATIVE, INC. | WILBURTON, OK | BancFirst |
| $350,000–1 million | KINDFUL HOSPICE I, LLC | ADA, OK | BancFirst |
| $350,000–1 million | KING ELECTRIC LLC | EL RENO, OK | BancFirst |
| $350,000–1 million | KIPP OKC COLLEGE PREP | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | KLAUS INC. | Cushing, OK | BancFirst |
| $150,000–350,000 | KLAUS, INC. | CUSHING, OK | BancFirst |
| $150,000–350,000 | KLEAN-R-US JANITORIAL SERVICE INC | MCALESTER, OK | BancFirst |
| $150,000–350,000 | KNUTSON IRRIGATION DESIGN LLC | YUKON, OK | BancFirst |
| $150,000–350,000 | KOMEX LTD | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | KOSTA'S INC | DALLAS, TX | BancFirst |
| $150,000–350,000 | KOSTAS INC | Dallas, TX | BancFirst |
| $150,000–350,000 | KOSU CARE OF OKLAHOMA STATE UNIVERSITY | Stillwater, OK | BancFirst |
| $350,000–1 million | KUDRON READY MIX, INC. | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | L A KING, LLC | TULSA, OK | BancFirst |
| $350,000–1 million | L AND J ACQUISITIONS, LLC | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | L MYLES SMITH & CO, PC | EDMOND, OK | BancFirst |
| $150,000–350,000 | L R TOBY TRUCKING INC | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | L R TOBY TRUCKING INC | Oklahoma City, OK | BancFirst |
| $150,000–350,000 | L&L RETAIL CONSTRUCTION LLC | Norman, OK | BancFirst |
| $150,000–350,000 | L&L RETAIL CONSTRUCTION, LLC | NORMAN, OK | BancFirst |
| $150,000–350,000 | L-7 DESIGN, INC | DALLAS, TX | BancFirst |
| $150,000–350,000 | L-7 DESIGNS INC | Dallas, TX | BancFirst |
| $350,000–1 million | LA FIESTA MEXICAN RESTAURANT CORPORATION | Duncan, OK | BancFirst |
| $150,000–350,000 | LA FIESTA MEXICAN RESTAURANT CORPORATION | DUNCAN, OK | BancFirst |
| $150,000–350,000 | LA UNION 4 LLC | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | LA UNION 5 LLC | OKLAHOMA CITY, OK | BancFirst |
| $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 |
| $350,000–1 million | LAMB MANAGEMENT COMPANY, LLC | TULSA, OK | BancFirst |
| $150,000–350,000 | LANCE DOYLE, DC PC | YUKON, OK | BancFirst |
| $350,000–1 million | LANCE RUFFEL OIL & GAS, LLC | OKLAHOMA CITY, OK | BancFirst |
| $350,000–1 million | LAND ROVER TULSA, LLC | TULSA, OK | BancFirst |
| $350,000–1 million | LANGSTON CO | OKLAHOMA CITY, OK | BancFirst |
| $5–10 million | LARK, LLC | ADDISON, TX | BancFirst |
| $350,000–1 million | LARRY BREWER DENTAL LAB INC. | Tulsa, OK | BancFirst |
| $350,000–1 million | LARRY BREWER DENTAL LAB INC. | TULSA, OK | BancFirst |
| $150,000–350,000 | LAS TRANCAS INC | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | LASSITER ENTERPRISES INC. | Oklahoma City, OK | BancFirst |
| $350,000–1 million | LAST FRONTIER COUNCIL BOY SCOUTS OF AMERICA | Oklahoma City, OK | BancFirst |
| $350,000–1 million | LAST FRONTIER COUNCIL INC. BOY SCOUTS OF AMERICA | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | LAWTON LODGING LLC | Austin, TX | BancFirst |
| $150,000–350,000 | LAWTON LODGING LLC | AUSTIN, TX | BancFirst |
| $350,000–1 million | LDWW GROUP MANAGEMENT INC | Dallas, TX | BancFirst |
| $150,000–350,000 | LEADERSHIP ISD | Dallas, TX | BancFirst |
| $150,000–350,000 | LEADERSHIP ISD INC | DALLAS, TX | BancFirst |
| $150,000–350,000 | LEBE ENTERPRISES LLC | LAWTON, OK | BancFirst |
| $150,000–350,000 | LEE CONSTRUCTION & MAINTENANCE COMPANY | HOUSTON, TX | BancFirst |
| $150,000–350,000 | LEGACY CONSTRUCTION AND DEVELOPMENT CORPORATION | MIDWEST CITY, OK | BancFirst |
| $150,000–350,000 | LEGACY CONSTRUCTION AND DEVELOPMENT CORPORATION | Midwest City, OK | BancFirst |
| $150,000–350,000 | LEONARD BUILDING COMPANY LLC | Oklahoma City, OK | BancFirst |
| $150,000–350,000 | LEONARD BUILDING COMPANY, LLC | OKLAHOMA CITY, OK | BancFirst |
| $2–5 million | LEP HOLDINGS LLC | EDMOND, OK | BancFirst |
| $150,000–350,000 | LETTERING EXPRESS OK INC. | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | LETTERING EXPRESS OK INC. | Oklahoma City, OK | BancFirst |
| $150,000–350,000 | LEVY STRANGE BEFFORT LLC | OKLAHOMA CITY, OK | BancFirst |
| $150,000–350,000 | LEWIS JEWELER INCORPORATED | Moore, OK | BancFirst |
| $150,000–350,000 | LEWIS JEWELERS, INC. | OKLAHOMA CITY, OK | BancFirst |