S. 4246 · 119th Congress Ultra-Millionaire Tax Act of 2026 StageIn committee SponsorElizabeth Warren Introduced2026-03-26 Latest action2026-03-26 · Introduced in Senate Follow Summary Text Subjects Cosponsors (10) Votes (0) Actions Cosponsors (10) Tammy Duckworth Current member Senate IL Democrat Mazie Hirono Current member Senate HI Democrat Ed Markey Current member Senate MA Democrat Jeff Merkley Current member Senate OR Democrat Brian Schatz Current member Senate HI Democrat Adam Schiff Current member Senate CA Democrat Tina Smith Current member Senate MN Democrat Chris Van Hollen Current member Senate MD Democrat Peter Welch Current member Senate VT Democrat Sheldon Whitehouse Current member Senate RI Democrat