According to @EleanorTerrett, the U.S. Senate has selected a markup date for market structure legislation, signaling a scheduled committee session to work on the bill (source: @EleanorTerrett on X, Dec 31, 2025). In congressional procedure, a markup is when a committee debates, amends, and may vote to advance a bill to the full chamber, setting the pathway for potential floor consideration and timeline clarity (source: U.S. Senate, Senate Glossary). For trading, monitor the committee calendar for the session date, the publication of amendment packages, and the post-markup vote tally to manage event risk and regulatory timeline expectations (source: U.S. Senate, Senate Glossary).