4DMedical is trading 5.3% lower at A$4.11; no clear company catalyst for the decline has been identified. - The last completed session, October 2, closed at A$4.34, down 0.46%; the quoted move is not confirmed as an October 5 closing move. - Available reporting lists a short-seller-related headline but does not link it to this move, and announcement listings show no October 5 company catalyst. - Supplied broader-market context shows no directional index move that explains the decline.