| $2–5 million | L J THALMANN COMPANY | WILMETTE, IL | Byline Bank |
| $1–2 million | L. MARSHALL, INC. | GLENVIEW, IL | Byline Bank |
| $150,000–350,000 | LA VITA, INC. | DES PLAINES, IL | Byline Bank |
| $350,000–1 million | LAEUROPA ACADEMY LLC | SALT LAKE CITY, UT | Byline Bank |
| $350,000–1 million | LAKESIDE FOOD SALES, INC. | VERNON HILLS, IL | Byline Bank |
| $150,000–350,000 | LAKEVIEW IMMEDIATE CARE, LLC | CHICAGO, IL | Byline Bank |
| $150,000–350,000 | LAKIN GENERAL CORPORATION | MONTGOMERY, IL | Byline Bank |
| $1–2 million | LAKOS CORPORATION | FRESNO, CA | Byline Bank |
| $150,000–350,000 | LAMARCO SYSTEMS, INC. | NORTHBROOK, IL | Byline Bank |
| $150,000–350,000 | LANDMARK EXTERIORS, INC | LIBERTYVILLE, IL | Byline Bank |
| $350,000–1 million | LANDSCAPES & MORE CORP II INC | ALIQUIPPA, PA | Byline Bank |
| $2–5 million | LARSEN MANUFACTURING LLC | MUNDELEIN, IL | Byline Bank |
| $150,000–350,000 | LAS FUENTES #4 | MORTON GROVE, IL | Byline Bank |
| $150,000–350,000 | LASER AND VEIN AESTHETICS LTD. | CHICAGO, IL | Byline Bank |
| $350,000–1 million | LCG SALES INC | CHICAGO, IL | Byline Bank |
| $350,000–1 million | LEADJEN LLC | INDIANAPOLIS, IN | Byline Bank |
| $150,000–350,000 | LEAN MANUFACTURING GROUP, LLC | VALENCIA, CA | Byline Bank |
| $150,000–350,000 | LEFEVRE 7, LLC | HANOVER, PA | Byline Bank |
| $1–2 million | LEGACY INTERIOR & EXTERIOR DECORATING INC | ELGIN, IL | Byline Bank |
| $350,000–1 million | LENCO ELECTRONICS INC. | MCHENRY, IL | Byline Bank |
| $1–2 million | LESTER AND ROSALIE ANIXTER CENTER | CHICAGO, IL | Byline Bank |
| $350,000–1 million | LEWIS ACQUISITION CORP. | ADDISON, IL | Byline Bank |
| $350,000–1 million | LEWIS CARPETS, INC | NORTHBROOK, IL | Byline Bank |
| $350,000–1 million | LIBERTYVILLE TILE & CARPET | LIBERTYVILLE, IL | Byline Bank |
| $150,000–350,000 | LIBRA INDUSTRIES, INC. | ELK GROVE VILLAGE, IL | Byline Bank |
| $1–2 million | LIFT WORKS, INC. | ST. CHARLES, IL | Byline Bank |
| $150,000–350,000 | LINCOLN PARK AUTO, INC. | CHICAGO, IL | Byline Bank |
| $150,000–350,000 | LINDAHL MARINE CONTRACTORS, INC. | MINOOKA, IL | Byline Bank |
| $150,000–350,000 | LIVING ASSISTANCE WAUKESHA LLC | PEWAUKEE, WI | Byline Bank |
| $150,000–350,000 | LML, LLC | WILLISTON, VT | Byline Bank |
| $150,000–350,000 | LO N SLO LLC | OAK CREEK, WI | Byline Bank |
| $350,000–1 million | LOCAL ROOFING CO., INC. | GURNEE, IL | Byline Bank |
| $350,000–1 million | LODAN ELECTRONICS, INC. | ARLINGTON HEIGHTS, IL | Byline Bank |
| $350,000–1 million | LOJISTIC, LLC | COSTA MESA, CA | Byline Bank |
| $150,000–350,000 | LOUIE MANAGEMENT, LLC | EVANSVILLE, IN | Byline Bank |
| $150,000–350,000 | LR INTERNATIONAL INC. | FRANKLIN PARK, IL | Byline Bank |
| $150,000–350,000 | LUMBERJACK HARDWOODS, INC. | MENOMINEE, MI | Byline Bank |
| $150,000–350,000 | LUNA RESTAURANT CORPORATION | CHICAGO, IL | Byline Bank |
| $150,000–350,000 | LUNCEFORD ENTERPRISES LLC | SCOTTSDALE, AZ | Byline Bank |
| $150,000–350,000 | M&D ENTERPRISES | LAWRENCEVILLE, GA | Byline Bank |
| $350,000–1 million | M&R PRECISION MACHINING, INC. | ELK GROVE VILLAGE, IL | Byline Bank |
| $350,000–1 million | M13 INC | SCHAUMBURG, IL | Byline Bank |
| $2–5 million | MAC PROPERTY MANAGEMENT, L. L. C. | ENGLEWOOD, NJ | Byline Bank |
| $150,000–350,000 | MAC'S PHARMACY #2, LLC | POWELL, TN | Byline Bank |
| $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 | 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 |
| $150,000–350,000 | MAIA BERGER DDS P.C. | NEW YORK, NY | 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 |
| $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 |
| $150,000–350,000 | MANUFACTURED SPECIALTIES, INC. | ST. CHARLES, 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 |
| $1–2 million | MARK SCHAFFER EXCAVATING & TRUCKING, INC. | NORWALK, OH | Byline Bank |
| $350,000–1 million | MARKETING ALTERNATIVES INC | ELGIN, 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 | MATHUSEK INC | OAKLAND, NJ | Byline Bank |
| $350,000–1 million | MAYA DEL SOL LLC | OAK PARK, 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 |
| $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 | 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 | MERCURY TUBE LLC | ENGLEWOOD, CO | 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 | MICHIGAN AVE GROOMING LLC | CHICAGO, 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 |
| $150,000–350,000 | MIDWEST CARDIAC CONSULTANTS, S.C. | DOWNERS GROVE, 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 |
| $350,000–1 million | MIDWEST SPOTTING, INC. | DES PLAINES, 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 | 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 | MINER, BARNHILL & GALLAND, PC | CHICAGO, 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 | MONAHAN LAW GROUP LLC | CHICAGO, 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 | MOONRIDGE ACADEMY LLC | CEDAR CITY, UT | Byline Bank |