Filtronic is trading at $3.68, up 7.92%; the cause of the October 21 move remains unclear. - No new company-specific announcement explaining the move appeared in searched news or announcement listings. - Filtronic’s $68.1 million SpaceX order was announced on October 1 and is prior context, not a confirmed fresh catalyst. - Nasdaq was up 0.76%, but evidence does not establish that it explains Filtronic’s rise; no reliable current volume or trading-activity figure was found.