LONDON (Reuters) - British hedge fund firm Man Group (EMG.L) on Wednesday said assets under management rose 4.2 percent in the first six months of 2018, helped by net inflows of $8.3 billion. Man Group’s total assets under management at the end of June rose to $113.7 billion, up from $109.1 billion at the end of December. Adjusted profit before tax increased by 5 percent from the first half of 2017, rising to $153 million, from $145 million.