| Security Benefit Corporation Federal Political Action Committee | Q | KS |
| Security Finance Corporation of Spartanburg and Affiliates Political Action Committee | Q | SC |
| Security in America PAC | O | DC |
| Security in America PAC | V | DC |
| Security Industry Association Political Action Committee, Securitypac | N | MD |
| Security Is Strength PAC | O | SC |
| Security Service Federal Credit Union PAC | Q | TX |
| Security Traders Association Political Action Committee | Q | NY |
| Sedgwick for Congress | H | CA |
| Sedinam2020 | P | MI |
| Sedition Accountability Project | O | DC |
| Sedoris4ne2nd | H | NE |
| Seeberger for Congress | H | TX |
| See Change - Science Energy & Environment Change PAC | N | CA |
| Seec Victory Fund | N | DC |
| Seed and Sow | N | CO |
| Seed First Political Action Committee | Q | DC |
| Seeking Justice PAC | Q | AL |
| Seely for Congress | H | MI |
| See Russia From My House PAC | O | DC |
| Segal for President | P | MD |
| Seguin for Senate | S | UT |
| Seidman for Congress | H | GA |
| Seikaly Victory Fund | N | TX |
| Seiu California State Council for Working People | C | CA |
| Seiu California State Council (Nonprofit 501 (C) (5) ) | C | CA |
| Seiu Cope (Service Employees International Union Committee on Political Education) | Q | DC |
| Seiu District 1199 Pce | I | OH |
| Seiu Florida State Central | I | FL |
| Seiu Hciimk | C | IL |
| Seiu Healthcare Illinois and Indiana | C | IL |
| Seiu Healthcare Missouri | C | MO |
| Seiu Illinois Council | C | IL |
| Seiu Local 2015 | C | CA |
| Seiu Local 2015 | I | CA |
| Seiu Local 32bj | C | NY |
| Seiu Michigan State Council | C | MI |
| Seiu Ohio State Joint Council | C | OH |
| Seiu Ohio State Joint Council Pce | I | OH |
| Selective Insurance Company of America Political Action Committee | Q | NJ |
| Select Medical Corporation PAC | Q | PA |
| Selena Martinez | H | CA |
| Selen for Congress | H | NJ |
| Self for Congress | H | TX |
| Self Governing Liberty | H | FL |
| Self-Insurance Institute of America, INC. PAC (Self-Insurance Pac) | Q | DC |
| Self Storage Association Political Action Committee | N | VA |
| Selinda - the People for Congress | H | NM |
| Selker4congress | H | OR |
| Selker for 4th District | H | OR |
| Selmont4congress | H | FL |
| Selmontcongress2025 | H | FL |
| Sema for Texas | S | TX |
| Semiconductor Industry Association PAC (Sia Pac) | N | DC |
| Semi Political Alliance of Semiconductor Equipment and Materials International | Q | CA |
| Semo Democratic Rally Committee PAC | N | MO |
| Semper Fi PAC | N | MD |
| Sempra Energy Employees Political Action Committee- Federal | Q | CA |
| Senate 180 Victory Fund | S | DC |
| Senate 2020 | S | DC |
| Senate Advocacy Fund | O | TX |
| Senate Battleground Victory Fund | S | DC |
| Senate Challengers Victory Fund | S | DC |
| Senate Committee for Markland | S | TX |
| Senate Conservatives Action | O | DC |
| Senate Conservatives Fund | Q | DC |
| Senate Defense Force | O | CA |
| Senate Democrats | O | TX |
| Senate Eagle PAC | Q | TN |
| Senate Fight Fund | N | DC |
| Senate Firewall 2020 | N | VA |
| Senate Firewall 2020 | N | TX |
| Senate Firewall 2020 II | N | VA |
| Senate Firewall Committee III | N | VA |
| Senate Georgia Battleground Fund | N | DC |
| Senate Gop Winning Women Victory Committee | S | VA |
| Senate Impact | S | DC |
| Senate Impact 2020 | N | DC |
| Senate Impact 2024 | S | DC |
| Senate Impact: Az, Ia & Nm | N | DC |
| Senate Impact Project | S | DC |
| Senate Incumbent Victory Fund | S | DC |
| Senate Leadership Fund | O | VA |
| Senate Majority Firewall 2020 | S | GA |
| Senate Majority Fund | O | CO |
| Senate Moms Victory Fund | S | MA |
| Senate Oh & Mt | N | DC |
| Senate Pa & Nv | N | DC |
| Senate Path to Victory 2024 | N | AL |
| Senate Pa & Wi | S | DC |
| Senate Reform Fund | O | VA |
| Senate Representation Matters | N | DC |
| Senate Representation Matters II | N | DC |
| Senate Spurs | N | DC |
| Senate Victory 2020 | S | VA |
| Senate Victory 2023 | N | WA |
| Senate Victory 2024 | S | DC |
| Senate Victory for Sherrod Brown 2024 | N | DC |
| Senate Victory Mi & Pa | S | DC |
| Senate Victory PAC | X | MN |
| Senate Victory Project | S | DC |
| Senate Women Leadership Council Committee | N | AL |
| Senator in Name Only | O | AK |
| Senator Quinci Pryce | P | CA |
| Senator Xan John, INC. | S | LA |
| Send Corey 2022 | H | WA |
| Send Her Home | O | OH |
| Send in the Marine PAC | O | MN |
| Send in the Seal PAC | Q | VA |
| Send Subrina Banks to Congress | H | OK |
| Seney for Congress | H | NY |
| Senior Care Pharmacy Coalition PAC | Q | DC |
| Seniors for Affordable Healthcare PAC | O | WI |
| Seniors for A Safe & Sane America | O | NC |
| Seniors for Mike Lee | O | UT |
| Senior Votes Count | N | CA |
| Sensenbrenner Committee | H | WI |
| Sensible Americans | V | DC |
| Sensible American Solutions Supporting Everyone PAC | Q | VA |
| Sensible American Solutions Supporting Everyone State PAC | N | VA |
| Sensible Center PAC | N | WI |
| Sentinel PAC | N | NV |
| Sentinel PAC | N | VA |
| Sentry Insurance A Mutual Company Federal Political Action Committee | Q | WI |
| Sepi Gilani US Senate 2024 | S | CA |
| Sepi Shyne for Congress | H | CA |
| Seppelfrick for Senate 2020 | S | IL |
| Serbian American Voters Alliance | N | FL |
| Serbin for Senate | S | AL |
| Serco INC. Political Action Committee (Serco Pac) | Q | VA |
| Sergei for Congress | H | CO |
| Sergio Alcubilla for Congress | H | HI |
| Serrano for Congress | H | DC |
| Servant Leadership Fund | N | GA |
| Serve America PAC | Q | MA |
| Serve America PAC - Restricted | N | MA |
| Serve America Victory Fund | N | AZ |
| Serve America Victory Fund | N | MA |
| Serve America Victory Fund | N | MA |
| Serve Oklahoma | N | DC |
| Servepa&Nj Fund | H | DC |
| Service and Honor | N | MD |
| Service Corporation International PAC | Q | TX |
| Service Employee International Union Local 1000 | C | CA |
| Service Employees International Union | C | DC |
| Service Employees International Union Local 521 Independent Expenditure Committee | C | CA |
| Service Employees International Union Local 721 Ctw Clc | C | CA |
| Service Employees International Union Local 99 | C | CA |
| Service Employees International Union Pa State Council | C | PA |
| Service Employees International Union Political Education and Action Fund | I | DC |
| Service Employees International Union-Seiu Local 2015 | C | CA |
| Service Employees International Union United Service Workers West (Seiu Usww) | I | CA |
| Service Employees International Union United Servive Workers West (Seiu Usww) | C | CA |
| Service Employees Int'L Union District 1199 | C | OH |
| Service First PAC | N | DC |
| Service First Women'S Victory Fund | H | KY |
| Service Honor Country Action Fund | O | VA |
| Service & Integrity PAC | O | DC |
| Service Knowledge Oath Leadership PAC (Skol Pac) | N | WI |
| Service Matters PAC | O | VA |
| Services Group of America Political Action Committee (Sga Pac) | Q | AZ |
| Service Station Dealers of America, INC., Ssda-PAC (Formerly Ncpr-Pac) | Q | MD |
| Serving for Freedom PAC, INC. | O | OK |
| Serving Our Country (Soc) PAC | N | CA |
| Sery Kim for Congress | H | TX |
| Ses Government Solutions PAC | N | VA |
| Sessler Victory Fund | N | WA |
| Sethatina Newman for President 2024 | P | MD |
| Seth D Pedersen for Congress | H | WA |
| Seth Hall for Congress | H | KY |
| Seth Leibsohn for Congress | H | AZ |
| Seth Moulton for America, INC. | P | MA |
| Seth Newman for Congress | H | CA |
| Seth Schechinger Presidential Campaign Committee | P | IA |
| Seventh Congressional District Republican Party of Minnesota | Y | MN |
| Severino for Congress | H | IL |
| Severson for Congress | H | FL |
| Sexy Vegan for 2024 United States President | P | IL |
| Seymour Lee for President | P | TX |
| Sfa, INC. | V | TX |
| Sfbayarea Political Action Committee | O | CA |
| Sf Properties LLC Federal Political Action Committee A/K/A Schostak Family Federal PAC | N | MI |
| Sf Social Justice Democrats | N | CA |
| Sg PAC, INC. | O | MA |
| Sgt Michael T Captain for President | P | CO |
| Shabazz for Congress | H | OH |
| Shadle 4 President | P | OH |
| Shaffer for Pa-17 Republican Nominee Fund 2022 | H | VA |
| Shaffer Victory 2022 Committee | N | PA |
| Shaheen for Senate | S | DC |
| Shaheen Heitkamp Victory Fund | S | DC |
| Shaheen Jones Victory Fund | S | DC |
| Shaheen McGrath Victory Fund | N | DC |
| Shaheen Smith 2020 | S | DC |
| Shaheen Victory Fund 2020 | N | DC |
| Shahid Buttar for Congress Committee | H | CA |
| Shakeba Dennis Or Shakebad4president | P | CA |
| Shak Hill for Congress | H | NJ |
| Shalala Victory Fund | N | DC |
| Shaliek Tarpley for Congress | H | VA |