Former Snap executive Imran Khan, who started his own technology-stock fund after searching in vain for a hedge fund he could back, is showing solid results early on.Since launching in February, Khan’s Proem Investments Master Fund has generated a high-single-digit return — roughly in line with a 6.2% gain for HFRI Equity Hedge Technology Index. The fund employs a combination of fundamental research and quantitative analysis to take...