| M&I Political Awareness Fund
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| Macco for Wisconsin
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| Machine Tool PAC (Assn for Mfg Technology)
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| Machinists Non-Partisan PAC
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| Machinists Non-Partisan Political League - MNPL (Federal)
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| Madison Area Mechanical, Sheet Metal & Plumbing Contractors Assn (Corporation)
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| Madison Fire Department (Unregistered)
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| Madison Gas & Electric PAC
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| Madison Majority Project PAC
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| Madison Prof Police Officers
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| Madison Teachers Inc (Corporation)
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| Magellan Health (Corporation)
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| Magellan Health Inc Employee Committee for Good Govt (Federal)
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| Magellan Health Services
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| Mahlon Mitchell for Wisconsin
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| Maia Pearson for School Board (Local-Madison School District)
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| Main Street Action PAC
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| Major League Baseball PAC (Federal)
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| Make Liberty Win
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| Mammoth Nation LLC (Corporation)
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