GIGADEVICE is trading 4.3% down at HK$381.60, amid a sharp selloff in Hong Kong semiconductor and memory-chip shares on October 8. - Peer chip stocks also fell as investors questioned the AI investment boom and took profits; no clear company-specific announcement explains the move. - Higher U.S. Treasury yields and oil prices renewed inflation and rate concerns, while Hong Kong technology shares weakened. - The company disclosed an A-share buyback, but available coverage does not establish it as the cause.