The CEO buys are during a weird 15 day gap between the earnings announcement and the conference call. My guess is that he's going to make an enthusiastic pitch during the call.
"Webcast Schedule
For Q&A regarding the third quarter 2015 performance upon the release, investors may send the questions via email to IR@gigamedia.com.tw by November 10, and the responses will be replied in the webcast. Webcast will be available on the company's official website www.gigamedia.com on November 20.?