The Securities and Exchange Commission may begin a civil enforcement action against Trend Micro CEO Eva Chen ( TMIC) for financial violations involving her husband, Daniel Chiang, the company said Wednesday. The allegations concern trading in the securities of Sina ( SINA), an online media company based in Shanghai. Chiang is the former co-chairman of that company. The SEC is also looking into whether Chen under-reported her holdings in Trend Micro shares. "The company is not aware of any allegations against Ms. Chen that would be attributable to the company," Trend Micro said in a press release. Trend Micro's board of directors and board of corporate auditors are monitoring the situation for its effect on the company. Shares of the antivirus software company dropped 3.8%, or $1.29, to $33.15 in recent Wednesday trading; Sina shares dipped 1.4%, or 36 cents to $25.02.