SEOUL (Reuters) - Elliott Management sold all its shares in Hyundai Motor Group companies last year, a South Korean newspaper reported on Wednesday, after the U.S. activist hedge fund's campaign demanding 7 trillion won ($6 billion) in dividends and board seats was thwarted in March. Elliott held more than $1 billion (£710.6 million) worth of shares in Hyundai Motor <005380.KS>, Kia Motors <000270.KS> and Hyundai Mobis <012330.KS>, an Elliott unit said in April 2018.