Deep Yellow is trading 5.3% down at A$1.17 on October 1, 2026, after recent declines; no specific catalyst has been identified. - The latest listed company filing was a September 29 notice that a substantial holder ceased to be one; no source links it directly to the decline. - Supplied broader-market context shows no significant same-direction decline that clearly explains the move. - Yahoo Finance search results also show a 5.26% move.