| $150,000–350,000 | ILLINOIS CONFERENCE OF THE UNITED CHURCH OF CHRIST | WESTCHESTER, IL | Byline Bank |
| $1–2 million | IMAGETEC LP | McHenry, IL | Byline Bank |
| $1–2 million | IMAGETEC LP | MCHENRY, IL | Byline Bank |
| $150,000–350,000 | IMOTORSPORTS SPB LLC | ELMHURST, IL | Byline Bank |
| $150,000–350,000 | IMOTORSPORTS, INC. | ELMHURST, IL | Byline Bank |
| $150,000–350,000 | INCWORX INC | Schaumburg, IL | Byline Bank |
| $2–5 million | INDEPENDENCE PLUS, INC. | OAK BROOK, IL | Byline Bank |
| $150,000–350,000 | INDIA HOUSE RESTAURANT LLC | Chicago, IL | Byline Bank |
| $150,000–350,000 | INDIA HOUSE RESTAURANT LLC | CHICAGO, IL | Byline Bank |
| $350,000–1 million | INDUSTRIAL ENCLOSURE CORP. | Aurora, IL | Byline Bank |
| $150,000–350,000 | INDUSTRIAL LOSS CONSULTANTS, INC. | Elk Grove Village, IL | Byline Bank |
| $350,000–1 million | INFANT WELFARE SOCIETY OF EVANSTON | Evanston, IL | Byline Bank |
| $150,000–350,000 | INFOTECH RESOURCES, INC | Glen Ellyn, IL | Byline Bank |
| $350,000–1 million | INGRACE'S COMPANY III INC. | Chicago, IL | Byline Bank |
| $150,000–350,000 | INGRACE'S COMPANY III, INC. | CHICAGO, IL | Byline Bank |
| $150,000–350,000 | INGRACE'S COMPANY VI INC. | Chicago, IL | Byline Bank |
| $150,000–350,000 | INGRACE'S COMPANY VIII INC. | Chicago, IL | Byline Bank |
| $350,000–1 million | INLAD TRUCK AND VAN EQUIPMENT COMPANY, INCORPORATED | LOMBARD, IL | Byline Bank |
| $350,000–1 million | INLINE FILLING SYSTEMS, LLC | VENICE, FL | Byline Bank |
| $150,000–350,000 | INNER CITY COMPUTER STARS FOUNDATION | Chicago, IL | Byline Bank |
| $150,000–350,000 | INNOVATIVE RACK & GEAR CO., INC. | Wood Dale, IL | Byline Bank |
| $150,000–350,000 | INSIGHT CONSULTING GROUP, LLC | ROSEMONT, IL | Byline Bank |
| $150,000–350,000 | INSIGHT CONSULTING GROUP, LLC | Rosemont, IL | Byline Bank |
| $150,000–350,000 | INTEGRATED DISPLAY SYSTEMS INC. | EVANSTON, IL | Byline Bank |
| $350,000–1 million | INTEGRATED HOMECARE SERVICES CHICAGO CORPORATION | CAROL STREAM, IL | Byline Bank |
| $350,000–1 million | INTEGRATED LAKES MANAGEMENT INC | Waukegan, IL | Byline Bank |
| $150,000–350,000 | INTELEX USA, LLC. | East Dundee, IL | Byline Bank |
| $150,000–350,000 | INTERNATIONAL MARBLE & GRANITE SUPPLY, INC. | Chicago, IL | Byline Bank |
| $150,000–350,000 | INTERNATIONAL MARBLE & GRANITE SUPPLY, INC. | Chicago, IL | Byline Bank |
| $150,000–350,000 | ISSHE INC. | Chicago, IL | Byline Bank |
| $150,000–350,000 | ISSHE INC. | CHICAGO, IL | Byline Bank |
| $150,000–350,000 | ITALIAN MARBLE AND GRANITE CO. INC. | Chicago, IL | Byline Bank |
| $150,000–350,000 | ITALIAN MARBLE AND GRANITE CO. INC. | CHICAGO, IL | Byline Bank |
| $150,000–350,000 | ITALO-JUDAIC DINING COMPANY | Chicago, IL | Byline Bank |
| $350,000–1 million | IVERCREST INC | CHICAGO, IL | Byline Bank |
| $350,000–1 million | IVERCREST INC | Chicago, IL | Byline Bank |
| $150,000–350,000 | J & A FREIGHT SYSTEMS, INC. | CHICAGO, IL | Byline Bank |
| $150,000–350,000 | J & C TUTTI FRUTTI II INC. | CHICAGO, IL | Byline Bank |
| $150,000–350,000 | J & J BAGGING, LLC | YAZOO CITY, MS | Byline Bank |
| $150,000–350,000 | J & R LOCK & SAFE | Libertyville, IL | Byline Bank |
| $150,000–350,000 | J & R LOCK & SAFE | Libertyville, IL | Byline Bank |
| $150,000–350,000 | J . G. UNIFORMS INC. | Chicago, IL | Byline Bank |
| $150,000–350,000 | J . G. UNIFORMS, INC. | CHICAGO, IL | Byline Bank |
| $150,000–350,000 | J. M. VACCARO TRUCKING, INC. | CHICAGO, IL | Byline Bank |
| $350,000–1 million | J.D. GRAPHIC CO., INC. | ELK GROVE VILLAGE, IL | Byline Bank |
| $350,000–1 million | JACK PHELAN CHEVROLET INC | LYONS, IL | Byline Bank |
| $1–2 million | JACK PHELAN DODGE, LLC | LA GRANGE, IL | Byline Bank |
| $1–2 million | JACK PHELAN DODGE, LLC | Countryside, IL | Byline Bank |
| $350,000–1 million | JACKSON SPRING & MANUFACTURING CO. INC. | ELK GROVE VILLAGE, IL | Byline Bank |
| $150,000–350,000 | JACOBS & SON INC. | Rolling Meadows, IL | Byline Bank |
| $150,000–350,000 | JACOBS & SON, INC. | ROLLING MEADOWS, IL | Byline Bank |
| $350,000–1 million | JAKES MACHINING & REBUILDING SERVICE INC. | Aurora, IL | Byline Bank |
| $350,000–1 million | JAKES MACHINING & REBUILDING SERVICE, INC. | AURORA, IL | Byline Bank |
| $150,000–350,000 | JAMES ANTHONY SALON LTD. | Oak Park, IL | Byline Bank |
| $150,000–350,000 | JAMES ANTHONY SALON, LTD. | OAK PARK, IL | Byline Bank |
| $350,000–1 million | JAMESON'S HUNTLEY INC | Huntley, IL | Byline Bank |
| $150,000–350,000 | JAMESON'S HUNTLEY, INC | Huntley, IL | Byline Bank |
| $150,000–350,000 | JAMESON'S VERNON HILLS INC. | Vernon Hills, IL | Byline Bank |
| $150,000–350,000 | JAMESON'S VERNON HILLS, INC. | VERNON HILLS, IL | Byline Bank |
| $350,000–1 million | JANLER CORPORATION | Chicago, IL | Byline Bank |
| $150,000–350,000 | JAY KAY COLLISION CENTER INC. | Chicago, IL | Byline Bank |
| $150,000–350,000 | JAY KAY COLLISION CENTER, INC. | CHICAGO, IL | Byline Bank |
| $150,000–350,000 | JC AIR ACADEMY INC. | Stockton, CA | Byline Bank |
| $150,000–350,000 | JC AIR ACADEMY, INC. | STOCKTON, CA | Byline Bank |
| $150,000–350,000 | JCC RESTAURANT COMPANY | Elmhurst, IL | Byline Bank |
| $150,000–350,000 | JCC RESTAURANT COMPANY | ELMHURST, IL | Byline Bank |
| $150,000–350,000 | JDM3 LLC AND LET'S DO LUNCH INC. | Tinley Park, IL | Byline Bank |
| $150,000–350,000 | JDM3, LLC AND LET'S DO LUNCH, INC. | TINLEY PARK, IL | Byline Bank |
| $150,000–350,000 | JE TOWNS AGENCY INC | Addison, IL | Byline Bank |
| $350,000–1 million | JEN-TER WIRE & ELEMENT INC. | Fox Lake, WI | Byline Bank |
| $350,000–1 million | JEN-TER WIRE & ELEMENT, INC. | FOX LAKE, WI | Byline Bank |
| $350,000–1 million | JENNINGS REALTY INC. | EVANSTON, IL | Byline Bank |
| $1–2 million | JERRY'S FRUIT & GARDEN CENTER, INC. | NILES, IL | Byline Bank |
| $150,000–350,000 | JEWISH RECONSTRUCTIONIST CONGREGATION | Evanston, IL | Byline Bank |
| $150,000–350,000 | JEWISH RECONSTRUCTIONIST CONGREGATION | Evanston, IL | Byline Bank |
| $150,000–350,000 | JEXAL'S INC. | MCHENRY, IL | Byline Bank |
| $150,000–350,000 | JIMMYS CHARHOUSE OF LIBERTYVILLE INC | Libertyville, IL | Byline Bank |
| $150,000–350,000 | JIMMYS CHARHOUSE OF LIBERTYVILLE INC | LIBERTYVILLE, IL | Byline Bank |
| $150,000–350,000 | JKZ HOLDINGS INC. | HOLCOMBE, WI | Byline Bank |
| $350,000–1 million | JMAC INTERNATIONAL INC | Anaheim, CA | Byline Bank |
| $350,000–1 million | JOEL KENNEDY CONSTRUCTING CORP. | Chicago, IL | Byline Bank |
| $350,000–1 million | JOEL KENNEDY CONSTRUCTING CORP. | CHICAGO, IL | Byline Bank |
| $150,000–350,000 | JOHN J CAHILL INC | Evanston, IL | Byline Bank |
| $150,000–350,000 | JOHN J CAHILL, INC | EVANSTON, IL | Byline Bank |
| $150,000–350,000 | JOHNNIE'S CORPORATION | ELMWOOD PARK, IL | Byline Bank |
| $150,000–350,000 | JORDE TRANSPORT INC | Palos Park, IL | Byline Bank |
| $150,000–350,000 | JORGE I. RODRIGUEZ INSURANCE AGENCY LTD | Chicago, IL | Byline Bank |
| $150,000–350,000 | JORGE I. RODRIGUEZ INSURANCE AGENCY, LTD | CHICAGO, IL | Byline Bank |
| $350,000–1 million | JOSEPH ELECTRONICS INC | Niles, IL | Byline Bank |
| $350,000–1 million | JOSEPH ELECTRONICS INC | Niles, IL | Byline Bank |
| $150,000–350,000 | JOSEPH M WIEDEMANN AND SONS, INC | ARLINGTON HEIGHTS, IL | Byline Bank |
| $150,000–350,000 | JTS INC | Evanston, IL | Byline Bank |
| $150,000–350,000 | JTSPAETH, INC. | MILWAUKEE, WI | Byline Bank |
| $150,000–350,000 | JUDELE CORP. | HOFFMAN ESTATES, IL | Byline Bank |
| $150,000–350,000 | JUDELE CORP. | Hoffman Estates, IL | Byline Bank |
| $1–2 million | JUDSON UNIVERSITY | Elgin, IL | Byline Bank |
| $150,000–350,000 | K & A FOOD INDUSTRIES, LLC | FOX LAKE, IL | Byline Bank |
| $150,000–350,000 | KEEN EDGE COMPANY, INC. | LYONS, IL | Byline Bank |
| $350,000–1 million | KEMPSTER CORCORAN QUICENO & LENZ-CALVO LTD | Chicago, IL | Byline Bank |
| $350,000–1 million | KEMPSTER, CORCORAN, QUICENO & LENZ-CALVO LTD | Chicago, IL | Byline Bank |