| SMART Transportation Division PAC (Federal)
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| SMART Transportation Division PAC (formerly United Transportation Union)
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| Smile Direct Club (Corporation)
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| Smileage Dental Care Inc
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| Smiths Group Services Corp
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| Smiths Group Services Corp PAC (Federal)
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| Snodgrass for Assembly
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| Socialist Party USA (Unregistered)
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| Society of Thoracic Surgeons
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| Soik for State Senate
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| Solar Development Group (Corporation)
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| Solarpunk PAC (Federal)
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| Solberg for Supervisor (Local-Dane County)
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| Soldiers Grove Lions Club
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| Somos PAC
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| Sony Pictures Entertainment (Federal)
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| Sorenson for Sheboygan (Local-City of Sheboygan)
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| South Central United Educators
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| South Lakes United Educators (SLUE)
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| South Shore Republican Club
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