| $350,000–1 million | MEMORY CARE AMERICA LLC | SAN ANTONIO, TX | Fountainhead SBF LLC |
| $150,000–350,000 | MENCAR LLC | SAN ANTONIO, TX | The Bank of San Antonio |
| $150,000–350,000 | MENCIUS SAN ANTONIO, INC. | SAN ANTONIO, TX | JPMorgan Chase Bank, National Association |
| $150,000–350,000 | MENDEL KALIFF COMPANY, INC. | SAN ANTONIO, TX | Broadway National Bank |
| $150,000–350,000 | MENDEZ ENGINEERING, PLLC | SAN ANTONIO, TX | Frost Bank |
| $350,000–1 million | MEP ENGINEERING, INC. | SAN ANTONIO, TX | Frost Bank |
| $150,000–350,000 | MERCED HOUSING TEXAS | SAN ANTONIO, TX | Frost Bank |
| $150,000–350,000 | MERCHANT MULTISERVICE LLC | SAN ANTONIO, TX | Frost Bank |
| $1–2 million | MERCHCO SERVICES INC. | SAN ANTONIO, TX | Frost Bank |
| $350,000–1 million | MERCURY IN MOTION, LLC | SAN ANTONIO, TX | LCA Bank Corporation |
| $150,000–350,000 | MERGE LABS, INC. | SAN ANTONIO, TX | TransPecos Banks, SSB. |
| $150,000–350,000 | MERGE OFFICE INTERIORS, INC. | SAN ANTONIO, TX | Texas Champion Bank |
| $150,000–350,000 | MERIDIAN HEALTH CARE SERVICES LLC | SAN ANTONIO, TX | Frost Bank |
| $350,000–1 million | MERIT COFFEE LLC | SAN ANTONIO, TX | Frost Bank |
| $150,000–350,000 | MERITEC SERVICES, INC. | SAN ANTONIO, TX | Zions Bank, A Division of |
| $1–2 million | MERITUM ENERGY GP LLC | SAN ANTONIO, TX | Simmons Bank |
| $150,000–350,000 | MERLIN 21 AUTOMOTIVE | SAN ANTONIO, TX | Frost Bank |
| $150,000–350,000 | MERLIN ONE AIRCRAFT, LLC | SAN ANTONIO, TX | The Bank of San Antonio |
| $350,000–1 million | MERY INVESTMENTS, INC. | SAN ANTONIO, TX | Schertz Bank & Trust |
| $350,000–1 million | MESA EQUIPMENT COMPANY, INC | SAN ANTONIO, TX | Jefferson Bank |
| $350,000–1 million | MESQUITE COUNTRY ENTERPRISES, LP | SAN ANTONIO, TX | Broadway National Bank |
| $150,000–350,000 | METAMORPHOSIS CONSULTING, LLC | SAN ANTONIO, TX | Broadway National Bank |
| $150,000–350,000 | METICULOUS MAIDS, LLC | SAN ANTONIO, TX | Broadway National Bank |
| $2–5 million | METRICA INC. | SAN ANTONIO, TX | JPMorgan Chase Bank, National Association |
| $150,000–350,000 | METRO NORTH CARDIOVASCULAR ASSOCIATES, P.A. | SAN ANTONIO, TX | The Bank of San Antonio |
| $1–2 million | METROPLAN, INC. | SAN ANTONIO, TX | Frost Bank |
| $1–2 million | METROPOLITAN CONTRACTING COMPANY, LLC | SAN ANTONIO, TX | Texas Hill Country Bank |
| $350,000–1 million | METROPOLITAN FAMILY PRACTICE PA | SAN ANTONIO, TX | BBVA USA |
| $150,000–350,000 | MEV CONSULTING, LLC | SAN ANTONIO, TX | Newtek Small Business Finance, Inc. |
| $150,000–350,000 | MEXICAN AMERICAN CATHOLIC COLLEGE | SAN ANTONIO, TX | Wells Fargo Bank, National Association |
| $150,000–350,000 | MEXICAN MANHATTAN RESTAURANT, INC. | SAN ANTONIO, TX | Broadway National Bank |
| $150,000–350,000 | MFF AMBER OAKS, L.L.C. | SAN ANTONIO, TX | Country Club Bank |
| $2–5 million | MI TIERRA CAFE & BAKERY | SAN ANTONIO, TX | Frost Bank |
| $350,000–1 million | MICHAEL COWEN LAW FIRM, P.C. | SAN ANTONIO, TX | Frost Bank |
| $150,000–350,000 | MICHAEL G. IMBER ARCHITECTS PLLC | SAN ANTONIO, TX | Broadway National Bank |
| $150,000–350,000 | MICHAEL L. MURPHY MD PLLC | SAN ANTONIO, TX | Texas Capital Bank, National Association |
| $2–5 million | MID-COAST ELECTRIC SUPPLY, INC | SAN ANTONIO, TX | Frost Bank |
| $150,000–350,000 | MIDDLEBROOK FARMS, INC. | SAN ANTONIO, TX | Kleberg Bank, National Association |
| $150,000–350,000 | MIDDLEMAN CONSTRUCTION COMPANY LLC | SAN ANTONIO, TX | Frost Bank |
| $150,000–350,000 | MILAM REAL ESTATE CAPITAL, LLC | SAN ANTONIO, TX | Jefferson Bank |
| $150,000–350,000 | MILAN HOLDINGS, INC | SAN ANTONIO, TX | Frost Bank |
| $1–2 million | MILBERGER LANDSCAPING, INC. | SAN ANTONIO, TX | Broadway National Bank |
| $150,000–350,000 | MILCON CONSTRUCTION, LLC | SAN ANTONIO, TX | BBVA USA |
| $150,000–350,000 | MILEX CAPITAL LLC | SAN ANTONIO, TX | Broadway National Bank |
| $150,000–350,000 | MILITARY WARRIORS SUPPORT FOUNDATION | SAN ANTONIO, TX | Happy State Bank |
| $1–2 million | MILLENNIUM PACKAGING, L.P. | SAN ANTONIO, TX | BBVA USA |
| $350,000–1 million | MILLENNIUM TALK CORP. | SAN ANTONIO, TX | BBVA USA |
| $350,000–1 million | MILLS BROTHERS MASONRY CONTRACTING, LLC | SAN ANTONIO, TX | Texas Champion Bank |
| $150,000–350,000 | MINI COMPUTER MAINTENANCE, INC. | SAN ANTONIO, TX | Frost Bank |
| $150,000–350,000 | MINIT TACO 2 INC | SAN ANTONIO, TX | Frost Bank |
| $150,000–350,000 | MINIT TACO 3 INC | SAN ANTONIO, TX | Spirit of Texas Bank, SSB |
| $150,000–350,000 | MINIT TACO INC | SAN ANTONIO, TX | Frost Bank |
| $150,000–350,000 | MINNIE STEVENS PIPER FOUNDATION | SAN ANTONIO, TX | Frost Bank |
| $350,000–1 million | MIRACLE AUTOMOTIVE INCORPORATED | SAN ANTONIO, TX | Security Service FCU |
| $350,000–1 million | MIRELES PARTY ICE, INC. | SAN ANTONIO, TX | Frost Bank |
| $150,000–350,000 | MISSION ASPHALT, LLC | SAN ANTONIO, TX | Texas Champion Bank |
| $350,000–1 million | MISSION CITY MANAGEMENT INC | SAN ANTONIO, TX | JPMorgan Chase Bank, National Association |
| $350,000–1 million | MISSION CYCLESPORTS, LP | SAN ANTONIO, TX | PlainsCapital Bank |
| $350,000–1 million | MISSION ELECTRIC SUPPLY, INC. | SAN ANTONIO, TX | Frost Bank |
| $150,000–350,000 | MISSION LANDSCAPE SUPPLIES, INC | SAN ANTONIO, TX | JPMorgan Chase Bank, National Association |
| $5–10 million | MISSION PHARMACAL COMPANY | SAN ANTONIO, TX | Broadway National Bank |
| $350,000–1 million | MISSION PLUMBING, HEATING, AND AIR CONDITIONING CO., INC | SAN ANTONIO, TX | Broadway National Bank |
| $1–2 million | MISSION ROAD DEVELOPMENTAL CENTER | SAN ANTONIO, TX | JPMorgan Chase Bank, National Association |
| $150,000–350,000 | MISSION SPRINGS CHRISTIAN SCHOOL, INC | SAN ANTONIO, TX | The Bank of San Antonio |
| $150,000–350,000 | MISSION SURGICAL EQUIPMENT, INC. | SAN ANTONIO, TX | Peoples Bank |
| $350,000–1 million | MISSION TITLE, LP | SAN ANTONIO, TX | Community National Bank |
| $150,000–350,000 | MISTA C'S FRIED CHICKEN & WAFFLES INC | SAN ANTONIO, TX | First National Bank Texas |
| $150,000–350,000 | MITCHAN CELLULAR LLC | SAN ANTONIO, TX | Security Service FCU |
| $150,000–350,000 | MJS ENTERPRISES INC | SAN ANTONIO, TX | Peoples Bank |
| $350,000–1 million | MK MARLOW COMPANY, LTD. LLP | SAN ANTONIO, TX | The Bank of San Antonio |
| $350,000–1 million | MK1 CONSTRUCTION SERVICES L.L.C. | SAN ANTONIO, TX | Frost Bank |
| $150,000–350,000 | MLC LANDSCAPING COMPANY | SAN ANTONIO, TX | JPMorgan Chase Bank, National Association |
| $350,000–1 million | MLDP OF TEXAS, LP | SAN ANTONIO, TX | Vantage Bank Texas |
| $350,000–1 million | MMI VENTURES, LLC | SAN ANTONIO, TX | Allegiance Bank |
| $350,000–1 million | MMM & D, LLC | SAN ANTONIO, TX | The Bank of San Antonio |
| $350,000–1 million | MOBIUS PARTNERS LLC | SAN ANTONIO, TX | The Bank of San Antonio |
| $150,000–350,000 | MODERN DAY CONCRETE CORPORATION | SAN ANTONIO, TX | River City FCU |
| $150,000–350,000 | MODERN FABRICATING COMPANY | SAN ANTONIO, TX | Fifth Third Bank |
| $150,000–350,000 | MOGO GRILLS LLC | SAN ANTONIO, TX | Texas Heritage Bank |
| $150,000–350,000 | MOMENTUM APPRAISAL MANAGEMENT GROUP, INC. | SAN ANTONIO, TX | Frost Bank |
| $150,000–350,000 | MONAHAN ENTERPRISES LP | SAN ANTONIO, TX | Prosperity Bank |
| $150,000–350,000 | MONFREY CONCESSIONS, L.L.C. | SAN ANTONIO, TX | Prosperity Bank |
| $150,000–350,000 | MONSTER VAPE LLC | SAN ANTONIO, TX | Wells Fargo Bank, National Association |
| $350,000–1 million | MONTERREY IRON & METAL, LTD. | SAN ANTONIO, TX | Jefferson Bank |
| $350,000–1 million | MONTICELLO CUSTOM HOMES, LP | SAN ANTONIO, TX | Broadway National Bank |
| $350,000–1 million | MOORE ERECTION LP | SAN ANTONIO, TX | Texas Capital Bank, National Association |
| $350,000–1 million | MORGAN'S WONDERLAND MANAGEMENT COMPANY INC. | SAN ANTONIO, TX | Broadway National Bank |
| $350,000–1 million | MORLANDT ELECTRIC CO | SAN ANTONIO, TX | JPMorgan Chase Bank, National Association |
| $2–5 million | MORNING MINISTRIES | SAN ANTONIO, TX | BBVA USA |
| $150,000–350,000 | MORRIS TECHNOLOGY SOLUTIONS, LLC | SAN ANTONIO, TX | Texas Capital Bank, National Association |
| $150,000–350,000 | MOSAIC LAND DEVELOPMENT, LLC | SAN ANTONIO, TX | Frost Bank |
| $350,000–1 million | MOSEL COMPANY | SAN ANTONIO, TX | Broadway National Bank |
| $350,000–1 million | MOTORS IMPORTS, LTD | SAN ANTONIO, TX | Frost Bank |
| $150,000–350,000 | MOUNT SACRED HEART SCHOOL, INC. | SAN ANTONIO, TX | JPMorgan Chase Bank, National Association |
| $350,000–1 million | MOY TARIN RAMIREZ ENGINEERS, LLC | SAN ANTONIO, TX | Frost Bank |
| $2–5 million | MPII, INC | SAN ANTONIO, TX | Truist Bank d/b/a Branch Banking & Trust Co |
| $5–10 million | MPOWER HOLDINGS LLC | SAN ANTONIO, TX | BBVA USA |
| $150,000–350,000 | MPS CONSTRUCTION & DESIGN, LLC | SAN ANTONIO, TX | JPMorgan Chase Bank, National Association |
| $150,000–350,000 | MS2, INC. | SAN ANTONIO, TX | Frost Bank |
| $1–2 million | MSB COMMUNICATIONS LLC | SAN ANTONIO, TX | The Bank of Austin |