The electoral reform of 2023 fixed the number of Bundestag seats at 630 by ending the awarding of
overhang mandates. Therefore, winning a first-past-the-post
first vote in one of the 299 Bundestag constituencies no longer guarantees a candidate entry into the Bundestag. If a party wins more constituency contests than their party's
second vote share entitles them to, their direct mandate winners in the state with the lowest constituency vote shares would not be seated, and the constituency seat would be left vacant. In the 2025 election, a total of 23 first vote winners in this predicament. In 19 of those constituencies, at least one rival who they defeated in the local contest entered Bundestag via list mandates. The other four constituencies, three of which are in Baden-Württemberg, remain without local representatives in the Bundestag. Of the 23 overhang first vote winners, three were incumbent constituency MdBs and four were incumbent list MdBs. When a vacancy for their respective parties for their respective states occur, these 23 first-vote winners will be given priority to fill the vacant seats, ahead of their parties' list candidates.
bold indicates an incumbent MdB
bold-italics indicates an incumbent MdB representing the constituency prior to the election ==Members who lost their seats==