SK IE Technology (KRX:361610) posted a fourth-quarter net loss attributable to shareholders of 130.6 billion won, widening from 100 billion won a year earlier, according to a Wednesday filing with the Korea Exchange.

Sales of the South Korean lithium-ion battery separator maker were down 29% year over year to 41.8 billion won from 59.3 billion won.

Shares of SK IE Technology increased more than 3% at market close.