Taiwan's stock exchange is adjusting which shares can be bought on margin after checking second-quarter results, a small negative for two companies and a positive for four others.

• Two listed companies, Chu Hai and Kang Na Hsiung, lose margin trading rights because their book value per share fell below face value.
• Four others — Lealea, Chien Shing, Jing Jin and Sheng Tai — get margin trading back after their book value recovered.
• The change takes effect Monday and comes from the routine review of second-quarter financial reports.
• Losing margin access usually means thinner trading and less speculative interest in a stock.

Outlook: The reinstated stocks may see more trading activity next week, while the two suspended names could face weaker demand.