| $350,000–1 million | MASTERS BROS INC - MAB5857 | Bloomington, IL | Busey Bank |
| $350,000–1 million | MASTERS BROTHERS, INC | BLOOMINGTON, IL | Busey Bank |
| $150,000–350,000 | MATCHBOOK CREATIVE INC. | INDIANAPOLIS, IN | Busey Bank |
| $150,000–350,000 | MATCHBOOK CREATIVE INC. - MAB5982 | Indianapolis, IN | Busey Bank |
| $150,000–350,000 | MATCO FIRE PROTECTION INC - MAB5986 | Paxton, IL | Busey Bank |
| $150,000–350,000 | MATCO FIRE PROTECTION, INCORPORATED | PAXTON, IL | Busey Bank |
| $350,000–1 million | MATERIAL DIFFERENCE TECH LLC - MAB6009 | Sarasota, FL | Busey Bank |
| $350,000–1 million | MATERIAL DIFFERENCE TECHNOLOGIES | SARASOTA, FL | Busey Bank |
| $350,000–1 million | MATTEX SERVICE COMPANY | CHAMPAIGN, IL | Busey Bank |
| $150,000–350,000 | MAX AIR TECHNOLOGY INC - MAB6873 | Wentzville, MO | Busey Bank |
| $150,000–350,000 | MAX AIR TECHNOLOGY, INC. | WENTZVILLE, MO | Busey Bank |
| $150,000–350,000 | MAX AUTENRIEB CHURCH INTERIOR DECORATING - M000224 | Edwardsville, IL | Busey Bank |
| $150,000–350,000 | MAX AUTENRIEB CHURCH INTERIOR DECORATING INC. | EDWARDSVILLE, IL | Busey Bank |
| $350,000–1 million | MAXXSONICS USA, INC. | LIBERTYVILLE, IL | Busey Bank |
| $150,000–350,000 | MB STEEL COMPANY INC - MAB7412 | Madison, IL | Busey Bank |
| $150,000–350,000 | MB STEEL COMPANY, INC. | MADISON, IL | Busey Bank |
| $150,000–350,000 | MCBRADY ENGINEERING INC | JOLIET, IL | Busey Bank |
| $150,000–350,000 | MCCABE'S FLEET MAINTENANCE, INC. | FORT MYERS, FL | Busey Bank |
| $350,000–1 million | MCCAY TOOL & ENGINEERING CO., INC. | SAINT LOUIS, MO | Busey Bank |
| $150,000–350,000 | MCCLURE FINANCIAL GROUP, INC. | CHAMPAIGN, IL | Busey Bank |
| $150,000–350,000 | MCCOY SERVICES INC | CHANNAHON, IL | Busey Bank |
| $1–2 million | MCGINTY BROS INC | Long Grove, IL | Busey Bank |
| $350,000–1 million | MCKELVIE, KROLL, MELLOH, ZIEMBA, AND ASSOCIATES DVM PA | CAPE CORAL, FL | Busey Bank |
| $150,000–350,000 | MCMAHON GROUP INC - MAC1526 | Saint Louis, MO | Busey Bank |
| $150,000–350,000 | MCMAHON GROUP, INC | SAINT LOUIS, MO | Busey Bank |
| $150,000–350,000 | MCNAUGHTON DEVELOPMENT LLC - MAC1855 | BURR RIDGE, IL | Busey Bank |
| $150,000–350,000 | MCNAUGHTON DEVELOPMENT, LLC | WILLOWBROOK, IL | Busey Bank |
| $150,000–350,000 | MCNICHOLL COUNSELING P.C. | CHAMPAIGN, IL | Busey Bank |
| $350,000–1 million | MD HOLDINGS LLC - MAC2384 | Mooresville, IN | Busey Bank |
| $350,000–1 million | MD HOLDINGS, LLC | MOORESVILLE, IN | Busey Bank |
| $150,000–350,000 | MDS MANUFACTURING LLC - MAC2397 | Saint Louis, MO | Busey Bank |
| $150,000–350,000 | MDS MANUFACTURING, LLC | SAINT LOUIS, MO | Busey Bank |
| $150,000–350,000 | MEADOWVIEW LAWN CARE, INC. | PEORIA, IL | Busey Bank |
| $350,000–1 million | MECO ERECTION, INC. | MORRIS, IL | Busey Bank |
| $150,000–350,000 | MEDIEQUIP INC - MAC2653 | Saint Louis, MO | Busey Bank |
| $150,000–350,000 | MEDIEQUIP, INC. | SAINT LOUIS, MO | Busey Bank |
| $350,000–1 million | MEDSOURCE LLC | BLOOMINGTON, IL | Busey Bank |
| $150,000–350,000 | MEDWIN PRIMARY CARE LLC - MAD6968 | Arnold, MO | Busey Bank |
| $350,000–1 million | MERICHKA'S - MAC3959 | Crest Hill, IL | Busey Bank |
| $150,000–350,000 | MERICHKA'S, INC | CREST HILL, IL | Busey Bank |
| $150,000–350,000 | MERMAID BUSINESS LLC | GRAND RAPIDS, MI | Busey Bank |
| $150,000–350,000 | MERMAID BUSINESS LLC - MAD6946 | Saugatuck, MI | Busey Bank |
| $350,000–1 million | MESON SABIKA INC | NAPERVILLE, IL | Busey Bank |
| $350,000–1 million | MESON SABIKA INC - MAC4268 | Naperville, IL | Busey Bank |
| $1–2 million | METAL TECHNOLOGIES INC - MAC4377 | BEDFORD, IN | Busey Bank |
| $1–2 million | METAL TECHNOLOGIES, INC. | BEDFORD, IN | Busey Bank |
| $150,000–350,000 | METALLINE INC. | JOLIET, IL | Busey Bank |
| $350,000–1 million | METRITECH INC. - MAC4437 | Champaign, IL | Busey Bank |
| $350,000–1 million | METRITECH, INC. | CHAMPAIGN, IL | Busey Bank |
| $150,000–350,000 | METRO EAST LUTHERAN HIGH SCHOOL - M000699 | Edwardsville, IL | Busey Bank |
| $150,000–350,000 | METRO EAST LUTHERAN HIGH SCHOOL ASSOCIATION, INC. | EDWARDSVILLE, IL | Busey Bank |
| $2–5 million | METRO-WEST ANESTHESIA GROUP, INC | CHESTERFIELD, MO | Busey Bank |
| $150,000–350,000 | METT MEDICAL FITNESS | JOLIET, IL | Busey Bank |
| $350,000–1 million | METT THERAPY SERVICES INC. | Joliet, IL | Busey Bank |
| $350,000–1 million | METT THERAPY SERVICES, INC. | JOLIET, IL | Busey Bank |
| $150,000–350,000 | MEYER ENTERPRISES LLC | EAST PEORIA, IL | Busey Bank |
| $150,000–350,000 | MEYER ENTERPRISES LLC - MAC4723 | East Peoria, IL | Busey Bank |
| $2–5 million | MHS LEGACY GROUP INC - MAC5074 | Saint Louis, MO | Busey Bank |
| $2–5 million | MHS LEGACY GROUP, INC. | SAINT LOUIS, MO | Busey Bank |
| $150,000–350,000 | MICHAELS' CATERING LLC - MAC5268 | Champaign, IL | Busey Bank |
| $2–5 million | MICHUDA CONSTRUCTION, INC. | TINLEY PARK, IL | Busey Bank |
| $150,000–350,000 | MICROPLASMA OZONE TECHNOLOGIES, INC | CHAMPAIGN, IL | Busey Bank |
| $150,000–350,000 | MIDCO GLOBAL, INC | Kirkwoood, MO | Busey Bank |
| $350,000–1 million | MIDWEST ENGINEERING - MAC5573 | Champaign, IL | Busey Bank |
| $350,000–1 million | MIDWEST ENGINEERING AND TESTING, INC. | CHAMPAIGN, IL | Busey Bank |
| $350,000–1 million | MIDWEST INDUSTRIAL SALES, INC. | GARDNER, IL | Busey Bank |
| $150,000–350,000 | MIDWEST MEP INC - MAC5595 | Willowbrook, IL | Busey Bank |
| $150,000–350,000 | MIDWEST MEP, INC. | WILLOWBROOK, IL | Busey Bank |
| $150,000–350,000 | MIDWEST PARKING SOLUTIONS - MAC5604 | ST LOUIS, MO | Busey Bank |
| $350,000–1 million | MIDWEST PROPERTY MANAGEMENT LIMITED PARTNERSHIP | JACKSONVILLE, IL | Busey Bank |
| $350,000–1 million | MIDWEST PROPERTY MANAGEMENT LP - MAA1033 | Jacksonville, IL | Busey Bank |
| $150,000–350,000 | MIKE'S AUTOMOTIVE MACHINE SHOP, INC. | SAINT LOUIS, MO | Busey Bank |
| $350,000–1 million | MIKE'S INC. - MAA9391 | South Roxana, IL | Busey Bank |
| $350,000–1 million | MIKE'S, INC. | SOUTH ROXANA, IL | Busey Bank |
| $350,000–1 million | MILLENNIUM MANAGEMENT & CONSULTING, INC. | SAINT LOUIS, MO | Busey Bank |
| $1–2 million | MILLER GROUP USA, LLC | BLOOMINGTON, IL | Busey Bank |
| $150,000–350,000 | MINOOKA SUPPORTIVE LIVING LLC | MINOOKA, IL | Busey Bank |
| $150,000–350,000 | MITCHELL & MITCHELL, D.D.S, P.A. | FORT MYERS, FL | Busey Bank |
| $1–2 million | MIV INC - MAD8330 | ROCKDALE, IL | Busey Bank |
| $150,000–350,000 | MLT GROUP INC | SAINT LOUIS, MO | Busey Bank |
| $150,000–350,000 | MLT GROUP INC - MAC8974 | Saint Louis, MO | Busey Bank |
| $150,000–350,000 | MOBIUS THERAPEUTICS, LLC | SAINT LOUIS, MO | Busey Bank |
| $350,000–1 million | MODERN PROCESS EQUIPMENT CORPORATION | CHICAGO, IL | Busey Bank |
| $150,000–350,000 | MOLDMAN ENTERPRISES LLC | Chicago, IL | Busey Bank |
| $150,000–350,000 | MOLDMAN ENTERPRISES, LLC | CHICAGO, IL | Busey Bank |
| $150,000–350,000 | MONARCH TOOL AND DIE COMPANY | Elmhurst, IL | Busey Bank |
| $150,000–350,000 | MONARCH TOOL AND DIE COMPANY | Elmhurst, IL | Busey Bank |
| $150,000–350,000 | MONDAY CLUB IV LLC - MAD6994 | Saint Charles, MO | Busey Bank |
| $2–5 million | MONICAL PIZZA CORPORATION | BRADLEY, IL | Busey Bank |
| $350,000–1 million | MONITOR TECHNOLOGIES LLC | ELBURN, IL | Busey Bank |
| $150,000–350,000 | MONOCLE INC - MAD6815 | Saint Louis, MO | Busey Bank |
| $150,000–350,000 | MONOCLE, INC. | SAINT LOUIS, MO | Busey Bank |
| $350,000–1 million | MOOSYLVANIA MARKETING, L.C. | SAINT LOUIS, MO | Busey Bank |
| $150,000–350,000 | MORNING STAR MISSION | JOLIET, IL | Busey Bank |
| $1–2 million | MORRIS MACHINE CO. | INDIANAPOLIS, IN | Busey Bank |
| $350,000–1 million | MOTOR APPLIANCE CORPORATION | WASHINGTON, MO | Busey Bank |
| $350,000–1 million | MOTOR APPLIANCE CORPORATION - MAD2995 | Washington, MO | Busey Bank |
| $350,000–1 million | MOUNT CARMEL COMMUNITIES - O'FALLON, LLC | O FALLON, MO | Busey Bank |
| $2–5 million | MRM HOLDING COMPANY, INC | DECATUR, IL | Busey Bank |
| $350,000–1 million | MTC HOLSTERS, LLC | SPRINGFIELD, MO | Busey Bank |