Shares of ASTI Holdings Limited (SGX: 575) surged 16.4% for the week to close at S$0.085 on Friday. In comparison, the Straits Times Index (SGX: ^STI) inched up by a mere 0.4% during the same time frame. This makes ASTI a massive gainer in the Singapore stock market this week. As a quick background, ASTI is involved in the research, design, development and manufacturing of semiconductor equipment. It has four research and development centres, 14 factories and 29 sales offices globally. ASTI also has controlling equity stakes in Advanced Systems Automation Limited (SGX: 5TY) and Dragon Group International Limited (SGX: MT1). Earlier in the week, ASTI made public that it has agreed to sell five of its wholly-owned subsidiaries to Shanghai Pudong Science and Technology Investment Co Ltd (PDST