| $2–5 million | KEN'S BEVERAGE, INC. | PLAINFIELD, IL | Byline Bank |
| $1–2 million | KESSOR ENTERPRISES LTD | Roselle, IL | Byline Bank |
| $150,000–350,000 | KEWASKUM FOODS LLC | KEWASKUM, WI | Byline Bank |
| $150,000–350,000 | KIDSLIFE DAYCARE CENTER INC. | Chicago, IL | Byline Bank |
| $150,000–350,000 | KIDSLIFE DAYCARE CENTER, INC. | Chicago, IL | Byline Bank |
| $150,000–350,000 | KIND AND JOYFUL CHILDCARE, LLC | Madison, WI | Byline Bank |
| $350,000–1 million | KING TESTER CORPORATION | Phoenixville, PA | Byline Bank |
| $350,000–1 million | KING TESTER CORPORATION | PHOENIXVILLE, PA | Byline Bank |
| $1–2 million | KINGSTON TILE COMPANY LTD. | Romeoville, IL | Byline Bank |
| $1–2 million | KINGSTON TILE COMPANY, LTD. | ROMEOVILLE, IL | Byline Bank |
| $150,000–350,000 | KINSEY & KINSEY INC. | Glen Ellyn, IL | Byline Bank |
| $150,000–350,000 | KINSEY & KINSEY, INC. | Glen Ellyn, IL | Byline Bank |
| $350,000–1 million | KIRK EYE CENTER SC | River Forest, IL | Byline Bank |
| $350,000–1 million | KIRK EYE CENTER SC | River Forest, IL | Byline Bank |
| $150,000–350,000 | KMS 2000 INC | Canton, OH | Byline Bank |
| $150,000–350,000 | KMS 2000 INC | CANTON, OH | Byline Bank |
| $150,000–350,000 | KOZY INC, DBA KOZY'S CYCLERY | Chicago, IL | Byline Bank |
| $150,000–350,000 | KPB ENTERPRISES, INC. | SKOKIE, IL | Byline Bank |
| $350,000–1 million | KREIS TOOL AND MANUFACTURING COMPANY INC | Elgin, IL | Byline Bank |
| $350,000–1 million | KREIS TOOL AND MANUFACTURING COMPANY, INC | Elgin, IL | Byline Bank |
| $150,000–350,000 | KROY LLC | Wauconda, IL | Byline Bank |
| $1–2 million | KRYSTYNA'S DELI INC. | MOUNT PROSPECT, IL | Byline Bank |
| $2–5 million | L J THALMANN COMPANY | WILMETTE, IL | Byline Bank |
| $1–2 million | L. MARSHALL INC. | Glenview, 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 |
| $150,000–350,000 | LAKE HOTEL MANAGEMENT CO | Chicago, IL | Byline Bank |
| $150,000–350,000 | LAKE HOTEL MANAGEMENT CO. | Chicago, IL | 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 |
| $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 | LAMARCO SYSTEMS, INC. | Northbrook, IL | Byline Bank |
| $150,000–350,000 | LANDMARK EXTERIORS INC | Libertyville, 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 |
| $350,000–1 million | LANDSCAPES & MORE CORP II INC | ALIQUIPPA, PA | Byline Bank |
| $2–5 million | LARSEN MANUFACTURING LLC | Mundelein, IL | 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 | LAS FUENTES #4 | Morton Grove, IL | Byline Bank |
| $150,000–350,000 | LAS FUENTES INC | CHICAGO, IL | Byline Bank |
| $150,000–350,000 | LAS FUENTES NO 2 INC | Alsip, IL | Byline Bank |
| $150,000–350,000 | LASER AND VEIN AESTHETICS LTD | Chicago, 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 |
| $150,000–350,000 | 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 | 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 |
| $350,000–1 million | LENCO ELECTRONICS INC. | MCHENRY, IL | Byline Bank |
| $1–2 million | LESTER AND ROSALIE ANIXTER CENTER | Chicago, IL | Byline Bank |
| $150,000–350,000 | LETTUCE FEED U ENTERPRISES I INC | Chicago, IL | Byline Bank |
| $350,000–1 million | LEWIS ACQUISITION CORP. | Addison, 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 | 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 | LINCOLN PARK AUTO, INC. | Chicago, IL | Byline Bank |
| $150,000–350,000 | LINDAHL MARINE CONTRACTORS INC. | Minooka, IL | Byline Bank |
| $150,000–350,000 | LINDAHL MARINE CONTRACTORS, INC. | Minooka, IL | Byline Bank |
| $150,000–350,000 | LISSNER CORPORATION | Eagle River, WI | Byline Bank |
| $150,000–350,000 | LISSNER CORPORATION | Eagle River, WI | Byline Bank |
| $150,000–350,000 | LIVING ASSISTANCE WAUKESHA LLC | Pewaukee, WI | Byline Bank |
| $150,000–350,000 | LIVING ASSISTANCE WAUKESHA LLC | PEWAUKEE, WI | Byline Bank |
| $150,000–350,000 | LKH MANAGEMENT | Chicago, IL | 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 |
| $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 | 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 |
| $350,000–1 million | LUNA RESTAURANT CORPORATION | Chicago, IL | 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 | LUNCEFORD ENTERPRISES LLC | Scottsdale, AZ | Byline Bank |
| $150,000–350,000 | LUNCEFORD TAX HOLDINGS LLC | Scottsdale, AZ | Byline Bank |
| $150,000–350,000 | LUNCEFORD TAX HOLDINGS LLC | SCOTTSDALE, AZ | Byline Bank |
| $150,000–350,000 | M&D ENTERPRISES | Lawrenceville, GA | 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 | M&R PRECISION MACHINING, INC. | ELK GROVE VILLAGE, IL | Byline Bank |
| $350,000–1 million | M13 INC | Schaumburg, 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 |