Shares of the following companies had unusual moves in Taiwan trading. Stock symbols are in parentheses and prices are as of the close in Taipei.

The benchmark Taiex Index rose 0.1 percent to 7,545.71.

Elan Microelectronics Corp. (2458) (2458 TT) increased 1.3 percent NT$42.15. The integrated circuit maker said April sales rose 21 percent to NT$565.16 million ($19.3 million), according to a statement to the Taiwan Stock Exchange.

Richtek Technology Corp. (6286) (6286 TT) surged 3.5 percent to NT$205, headed for the highest close since June 9. The integrated circuit maker was raised to neutral from sell at UBS AG, which cited a higher margin outlook.

TPK Holding Co. (3673) (3673 TT) lost 2.4 percent to NT$373. April sales fell 11 percent from a month ago to NT$11.86 billion, according to a statement on the company’s website.

To contact the reporter on this story: Weiyi Lim in Singapore at wlim26@bloomberg.net

To contact the editor responsible for this story: Darren Boey at dboey@bloomberg.net