Message : Required fields TOKYO (Reuters) - Shares of Seven & i Holdings surged to a two-year high on Thursday after Reuters reported activist investor ValueAct Capital took a stake in the Japanese owner of the 7-Eleven chain, signalling a potential shake-up at the retail giant. ValueAct amassed a 4.4% stake in Seven & i and believes the sum of its parts is worth much more than its current market value, the fund told investors in a letter seen by Reuters. The hedge fund said the 7-Eleven business could be worth more than double what its parent is currently valued at if the company restructures itself to focus on the convenience stores or if 7-Eleven is spun out.