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| Mary J Rincon Committee | P | AZ |
| Mary Knapp for Virginia | S | VA |
| Maryland Action Fund | O | DC |
| Maryland Association for Concerned Citizens Political Action Committee | Q | MD |
| Maryland Bankers Association Political Action Committee (Aka Maryland Bankpac) | Q | MD |
| Maryland Democratic Action Network | O | AZ |
| Marylanders for Rikki Vaughn 2018 | S | MD |
| Maryland Families First | O | TX |
| Maryland Grassroots Republicans | N | MD |
| Maryland Green Party | X | MD |
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| Maryland Republican State Central Committee | Y | MD |
| Maryland Right to Life INC Political Action Committee | Q | MD |
| Maryland Senate Republican Nominee Fund | N | DC |
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| Maryland'S Future | O | MD |
| Maryland State Education Association | C | MD |
| Maryland USA | O | DC |
| Maryland Victory Fund 2020 | N | DC |
| Maryland & Virginia Milk Producers Cooperative Association INC Political Action Committee | Q | VA |
| Mary Lawrence for Congress | H | MN |
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| Mary Miller Victory Committee | N | IL |
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| Maryott for Ca-49 | H | MD |
| Maryott for Ca-49 | H | MD |
| Maryott for Ca-49 Republican Nominee Fund 2022 | H | VA |
| Maryott for Congress | H | CA |
| Maryott Victory Fund | N | CA |
| Mary Peltola for Alaska | H | AK |
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| Marys Littlelams, Jaleesa | I | NC |
| Mary Smith Shuttleworth Action Fund | N | IL |
| Mary Taylor Shelby, PAC | N | MS |
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| Mary Todd for Montana | H | MT |
| Mary Todd for Montana - 2024 | H | MT |
| Mary Waters for Congress | H | MI |
| Mary West for Congress | H | GA |
| Masco Political Action Committee | N | MI |
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| Mason Contractors Association of America Political Action Commitee-Macpac | Q | IL |
| Mason for Minnesota | H | MN |
| Mason for President 2020 | P | CT |
| Mason Tenders District Council of Greater New York & Li PAC | Q | NY |
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| Massachusetts Biotechnology Council INC. Federal Political Action Committee | N | MA |
| Massachusetts Blue PAC of Blue Cross Blue Shield of Massachusetts | N | MA |
| Massachusetts Citizens for Life Political Action Committee | Q | MA |
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| Massachusetts Democratic State Committee | Y | MA |
| Massachusetts Financial Services Company Political Action Committee (Mfs Pac) | Q | MA |
| Massachusetts Mutual Life Insurance Company Political Action Committee | Q | MA |
| Massachusetts New Jersey Victory Fund | S | DC |
| Massachusetts Nurses Association | I | MA |
| Massachusetts Republican Leadership | O | WI |
| Massachusetts Republican Party | Y | MA |
| Massachusetts Senate Republican Nominee Fund | N | DC |
| Massachusetts Senate Victory 2020 | N | DC |
| Massachusetts Senate Victory 2024 | N | DC |
| Massachusetts Students for Progress | O | MA |
| Massachusetts Victory 2024 | N | MA |
| Massachusetts Victory Committee | N | DC |
| Massa for Congress | H | NY |
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| Massmedic Good Government Fund | N | MA |
| Mass PAC | Q | MA |
| Mastercard International INC. Employees' PAC | Q | DC |
| Masterman-Smith, Mike | H | CA |
| Masters for Az Senate Republican Nominee Fund 2022 | S | VA |
| Masters, Mates and Pilots Political Contribution Fund | Q | MD |
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| Masters Vance Committee | S | VA |
| Masters Victory Committee | N | VA |
| Masters Victory Committee | N | VA |
| Mast for Congress | H | FL |
| Mast Victory Committee | N | GA |
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| Matson, INC. Federal Election Committee | Q | CA |
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| Matthew C. Dibono for Congress Ny-6 | H | NY |
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| Matt Innis for U.S. Senate, INC. | S | NE |
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| Matt Laughridge for Congress, INC. | H | OH |
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| Max Abramson 2020 | P | NH |
| Max Abramson for Congress | H | NH |
| Maxar Technologies INC. PAC (Maxarpac) | Q | CO |
| Max Beckwith for Congress | H | NC |
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| Maxim Healthcare Services INC Political Action Committee (Maxim Healthcare Pac) | Q | MD |
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| Max Linn for Senate 2020 | S | ME |
| Max Miller for Congress | H | OH |