| Bing Professional Firefighters Association (Unregistered, New York)
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| Bioforward Inc (Corporation)
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| Biogen Inc (Corporation)
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| Bipartisan Voluntary Public Affairs Committee PNC Financial Services
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| Black Conservatives Fund
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| BlackPAC
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| Blacks for Political & Social Action of Dane County
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| Blair for Assembly
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| Blake Mathies for State Senate
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| Blanchard for District Attorney
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| BLOC PAC
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| Blue Cross & Blue Shield Assn (Federal)
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| Blue Cross & Blue Shield/Cobalt Corp
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| Blue Majority PAC (Mark Pocan Leadership PAC)
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| Blue Sky Waukesha, Inc.
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| Blue Sky Waukesha, Inc.
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| BlueRibbon Coalition PAC (Federal)
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| Bluhm for Assembly
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| BMO Financial Corporation Good Governance Fund (Federal)
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| BMO Harris Bank NA Government Affairs Fund
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