| $150,000–350,000 | MACHINE CONTROL SPECIALISTS, INC | Roselle, IL | Byline Bank |
| $350,000–1 million | MACHINE TOOL DESIGN & FAB LLC | FOSTORIA, OH | Byline Bank |
| $150,000–350,000 | MACHINE TOOL DESIGN & FAB LLC | Fostoria, OH | Byline Bank |
| $150,000–350,000 | MACNELL ACCOUNTING & CONSULTING LLP | Evanston, IL | Byline Bank |
| $350,000–1 million | MACROMATIC INDUSTRIAL CONTROLS, INC. | MENOMONEE FALLS, WI | Byline Bank |
| $350,000–1 million | MAI VOICE LLC | Elgin, IL | Byline Bank |
| $350,000–1 million | MAI VOICE, LLC | Elgin, IL | Byline Bank |
| $150,000–350,000 | MAKOWSKI'S REAL SAUSAGE COMPANY | Chicago, IL | Byline Bank |
| $350,000–1 million | MANCUSO MOTORSPORTS INC. | Chicago, IL | Byline Bank |
| $350,000–1 million | MANCUSO MOTORSPORTS, INC. | CHICAGO, IL | Byline Bank |
| $150,000–350,000 | MANE ATTRACTION MAKE-UP & HAIR SALON L.L.C. | Phoenix, AZ | Byline Bank |
| $150,000–350,000 | MANE ATTRACTION MAKE-UP & HAIR SALON, L.L.C. | PHOENIX, AZ | Byline Bank |
| $350,000–1 million | MANEVAL CONSTRUCTION COMPANY | INGLESIDE, IL | Byline Bank |
| $350,000–1 million | MANOR TOOL AND MANUFACTURING CO | SCHILLER PARK, IL | Byline Bank |
| $350,000–1 million | MANOR TOOL AND MANUFACTURING CO | Schiller Park, IL | Byline Bank |
| $150,000–350,000 | MANUFACTURED SPECIALTIES INC. | St Charles, IL | Byline Bank |
| $150,000–350,000 | MANUFACTURED SPECIALTIES, INC. | St. Charles, IL | Byline Bank |
| $150,000–350,000 | MAPLEWOOD LODGING LLC | SAINT PAUL, MN | Byline Bank |
| $350,000–1 million | MAR LAC BANQUETS INC | Glen Ellyn, IL | Byline Bank |
| $150,000–350,000 | MAR LAC BANQUETS INC | Glen Ellyn, IL | Byline Bank |
| $150,000–350,000 | MARCELLS PAPER & METAL INC | Chicago, IL | Byline Bank |
| $150,000–350,000 | MARCELLS PAPER & METAL, INC | CHICAGO, IL | Byline Bank |
| $1–2 million | MARK SCHAFFER EXCAVATING & TRUCKING INC. | Norwalk, OH | Byline Bank |
| $1–2 million | MARK SCHAFFER EXCAVATING & TRUCKING, INC. | NORWALK, OH | Byline Bank |
| $1–2 million | MARKETING ALTERNATIVES INC | ELGIN, IL | Byline Bank |
| $1–2 million | MARKETING CARD TECHNOLOGY LLC | Darien, IL | Byline Bank |
| $1–2 million | MARKETING CARD TECHNOLOGY, LLC | DOWNERS GROVE, IL | Byline Bank |
| $150,000–350,000 | MARKETPLACE BRANDS LLC | Elk Grove Village, IL | Byline Bank |
| $350,000–1 million | MAROSI DESIGNS LLC | NAPERVILLE, IL | Byline Bank |
| $350,000–1 million | MASTER SPRING & WIRE FORM CO. | Itasca, IL | Byline Bank |
| $350,000–1 million | MATHER PLACE | Evanston, IL | Byline Bank |
| $350,000–1 million | MATHUSEK INC | OAKLAND, NJ | Byline Bank |
| $350,000–1 million | MATHUSEK INC | OAKLAND, NJ | Byline Bank |
| $150,000–350,000 | MATTHEI & COLIN ASSOCIATES LLC | Chicago, IL | Byline Bank |
| $150,000–350,000 | MATTHEI & COLIN ASSOCIATES, LLC | Chicago, IL | Byline Bank |
| $150,000–350,000 | MAX TAX HOLDINGS PA INC | New York, NY | Byline Bank |
| $350,000–1 million | MAYA DEL SOL LLC | Oak Park, IL | Byline Bank |
| $350,000–1 million | MAYA DEL SOL LLC | Oak Park, IL | Byline Bank |
| $150,000–350,000 | MAYA HOSPITALITY LLC | Oak Park, IL | Byline Bank |
| $150,000–350,000 | MCCAHILL PAINTING COMPANY | Romeoville, IL | Byline Bank |
| $150,000–350,000 | MCCAHILL PAINTING COMPANY | Romeoville, IL | Byline Bank |
| $350,000–1 million | MCCRACKEN LABEL CO. | Chicago, IL | Byline Bank |
| $1–2 million | MCGAW YMCA | Evanston, IL | Byline Bank |
| $1–2 million | MCGAW YMCA | Evanston, IL | Byline Bank |
| $350,000–1 million | MCMASTER LLC | Loveland, OH | Byline Bank |
| $150,000–350,000 | MCMASTER, LLC | CINCINNATI, OH | Byline Bank |
| $1–2 million | MCNISH CORPORATION | Aurora, IL | Byline Bank |
| $150,000–350,000 | MDCC LLC | Evanston, IL | Byline Bank |
| $150,000–350,000 | MDCC, LLC | Evanston, IL | Byline Bank |
| $150,000–350,000 | MEAGRAH INC. | Villa Park, IL | Byline Bank |
| $150,000–350,000 | MED-LIEN SOLUTIONS HOLDING COMPANY, LLC | Southfield, MI | Byline Bank |
| $1–2 million | MEDIX SPECIALTY VEHICLE INC | ELKHART, IN | Byline Bank |
| $150,000–350,000 | MENOMONEE CLUB | Chicago, IL | Byline Bank |
| $150,000–350,000 | MERCENARY BREWERY & DISTILLERY LLC | Chicago, IL | Byline Bank |
| $150,000–350,000 | MERCENARY BREWERY & DISTILLERY LLC | Chicago, IL | Byline Bank |
| $150,000–350,000 | MERCURY TUBE LLC | Englewood, CO | Byline Bank |
| $150,000–350,000 | MERCURY TUBE LLC | ENGLEWOOD, CO | Byline Bank |
| $150,000–350,000 | METAL CERAMICS, INC. | Bensenville, IL | Byline Bank |
| $150,000–350,000 | METRO FREIGHT INC | Elburn, IL | Byline Bank |
| $1–2 million | MHW LTD | MANHASSET, NY | Byline Bank |
| $150,000–350,000 | MIA FRANCESCA CORPORATION | Chicago, IL | Byline Bank |
| $150,000–350,000 | MIA FRANCESCA CORPORATION | Chicago, IL | Byline Bank |
| $150,000–350,000 | MICHAEL COHEN | Glencoe, IL | Byline Bank |
| $150,000–350,000 | MICHIGAN AVE GROOMING LLC | Chicago, IL | Byline Bank |
| $150,000–350,000 | MICHIGAN AVE GROOMING LLC | CHICAGO, IL | Byline Bank |
| $150,000–350,000 | MID-STATES GRAPHICS LTD | Hanover Park, IL | Byline Bank |
| $350,000–1 million | MID-STATES GRAPHICS, LTD. | Hanover Park, IL | Byline Bank |
| $150,000–350,000 | MIDAN, INC. | CHICAGO, IL | Byline Bank |
| $350,000–1 million | MIDCON PRODUCTS, INC. | Hortonville, WI | Byline Bank |
| $150,000–350,000 | MIDWAY MOVING & STORAGE, INC. | Chicago, IL | Byline Bank |
| $350,000–1 million | MIDWEST ALUMINIUM SUPPLY INC | Montgomery, IL | Byline Bank |
| $350,000–1 million | MIDWEST COMPUTER PRODUCTS INC | West Chicago, IL | Byline Bank |
| $350,000–1 million | MIDWEST COMPUTER PRODUCTS INC | West Chicago, IL | Byline Bank |
| $1–2 million | MIDWEST GOODS INC | Bensenville, IL | Byline Bank |
| $1–2 million | MIDWEST GOODS INC | Bensenville, IL | Byline Bank |
| $350,000–1 million | MIDWEST SPOTTING, INC. | DES PLAINES, IL | Byline Bank |
| $350,000–1 million | MIDWEST TECHNICAL INSPECTION | HANOVER PARK, IL | Byline Bank |
| $350,000–1 million | MIDWEST TECHNICAL INSPECTION | Hanover Park, IL | Byline Bank |
| $150,000–350,000 | MIDWEST THERMAL SERVICES, INC. | BUTLER, WI | Byline Bank |
| $150,000–350,000 | MIDWEST THERMAL SERVICES, INC. | BUTLER, WI | Byline Bank |
| $350,000–1 million | MILITO'S LTD DBA ORSO'S RESTAURANT | Chicago, IL | Byline Bank |
| $150,000–350,000 | MILITO'S LTD DBA ORSO'S RESTAURANT | Chicago, IL | Byline Bank |
| $350,000–1 million | MIMO DISPLAY LLC | Libertyville, IL | Byline Bank |
| $350,000–1 million | MIMO DISPLAY LLC | LIBERTYVILLE, IL | Byline Bank |
| $350,000–1 million | MINER BARNHILL & GALLAND PC | Chicago, IL | Byline Bank |
| $350,000–1 million | MINER, BARNHILL & GALLAND, PC | Chicago, IL | Byline Bank |
| $150,000–350,000 | MISL TRANSPORT INC | Elburn, IL | Byline Bank |
| $1–2 million | MJ CELCO | Schiller Park, IL | Byline Bank |
| $1–2 million | MJ CELCO | SCHILLER PARK, IL | Byline Bank |
| $150,000–350,000 | MJ SUBURBAN, INC | MOUNT PROSPECT, IL | Byline Bank |
| $350,000–1 million | MODERN SILICONE TECHNOLOGIES INC. | Pinellas Park, FL | Byline Bank |
| $150,000–350,000 | MOEBIUS PRECISION INC. | Lansing, MI | Byline Bank |
| $150,000–350,000 | MOEBIUS PRECISION, INC. | LANSING, MI | Byline Bank |
| $150,000–350,000 | MONAHAN LAW GROUP LLC | Chicago, IL | Byline Bank |
| $350,000–1 million | MONSON NICHOLAS INC | Villa Park, IL | Byline Bank |
| $350,000–1 million | MONSON NICHOLAS INC | Villa Park, IL | Byline Bank |
| $150,000–350,000 | MONTAGUE PREMIER, INC. | SAN JOSE, CA | Byline Bank |
| $150,000–350,000 | MONTAGUE PREMIER, INC. | SAN JOSE, CA | Byline Bank |
| $150,000–350,000 | MOONRIDGE ACADEMY LLC | CEDAR CITY, UT | Byline Bank |
| $150,000–350,000 | MORAN DISTRIBUTION CENTERS INC | Elk Grove Village, IL | Byline Bank |