The 2025 Senate Resolution 1, introduced on January 6, 2025, by Senators LeMahieu, Feyen, and Felzkowski, officially organizes the Wisconsin Senate for the 2025-2026 session. The resolution outlines the election of presiding officers, legislative officers, and political party officers as mandated by the Wisconsin Constitution. Senator Mary J. Felzkowski is designated as the President, with Senator Patrick Testin serving as President pro tempore. The legislative officer role of Sergeant at Arms is filled by Honorable Tom Engels.

Additionally, the resolution lists the leadership for both the majority and minority parties within the Senate. Senator Devin LeMahieu is named as the Majority Leader, with Senators Dan Feyen, Van Wanggaard, and Rachael Cabral-Guevara holding other key positions. For the minority party, Senator Dianne Hesselbein serves as the Minority Leader, supported by Senators Jeff Smith, Mark Spreitzer, and Dora Drake in various roles. Upon adoption, the resolution mandates that copies be sent to the Assembly and the Governor to formally notify them of the Senate's organization for business.