By Jon Robinson According to a recent update, the sovereign wealth fund of the United Arab Emirates now owns 15 per cent of Vodafone. While the Emirates Investment Authority (EIA) has not acquired any more shares in the communications giant, Vodafone’s ongoing share buyback has reduced the number of shares outstanding, boosting EIA’s position on the share register. In March, the firm said it would return €4bn (£3.4bn) to shareholders as part of a broader capital allocation review to appease jittery shareholders following asset sales. It kicked off the return in May with an initial €500m (£430m…