** Shares in Sok Marketler SOKM.IS fall about 6% after the Turkish discount retailer reported a bigger-than-expected first-quarter loss
** The group's net loss widened to 735.7 million lira in Q1 from 467.5 million lira a year earlier, missing analysts' forecasts of a 347 million lira loss
** Brokerage Is Yatirim said bottom-line performance remained weak in the first quarter, despite being broadly in line with a weak consensus outlook
** The brokerage noted that while Sok delivered solid revenue growth and a recovery in operating profitability, the deeper-than-expected net loss weighed on sentiment
** Is Yatirim added that, despite improvements in operations, strong free cash flow generation and a robust cash position, the weak earnings outlook could trigger a negative near-term market reaction in the stock
** Stock on track for worst day in 14 months if losses hold
(Reporting by Canan Sevgili)
((canan.sevgili@thomsonreuters.com))