Organizers
- Matapeake Elementary School PTA's 5K
- Match Point Tennis and Fitness
- Matchpoint Tennis
- MATE Inspiration for Innovation
- MATE ROV Competition
- Mater Dei High School
- Mater Dei High School Camps
- Mater Dei Irish Fest 5k
- Math Enrichment
- Math Enrichment Summer
- Mathematician, Jr
- Mathematician, Jr / The Lost Arts Enrichment Center
- Mather Golf Course
- Mathitude
- Mathnasium
- Matrix Events Ltd
- Matsu Tennis Association
- Matt Callaghan Golf Academy
- Matt Griffith
- Matt Kluck Golf Instruction
- Matt Lee Classic 5K
- Matt McMahon Basketball Camps
- Matt Parnick Swim Club
- Matt Paul Sports
- Matt Rhule Football Camp, LLC
- Matt Robbins Golf School
- Matt Smith Soccer Academy
- Mattoon Knights of Columbuss
- Matt's Camp
- Maui Surfer Girls
- Mauldin High Spirit Week
- Maumee Little League
- Maumee Valley Adventurers
- Maumee Valley Country Day School
- Maumelle Youth Basketball Association
- Maverick race
- Max Adventure
- Max Multisport Adventures
- Max Multisport Coaching
- max tott
- MAX TRACKS, LLC
- Maximum Adventure
- Maximum Velocity Swimming
- MaxLife
- MaxLife at St. Peter's Lake Mary
- May Farms
- MAYA Organization
- Mayaguez Tennis Club
- MAYB
- Mayde Creek Junior High School Tennis Club
