 Poshmark Inc.s stock POSH, 1.34 initially fell 8 in extended trading Thursday after the social-commerce marketplace posted fiscal second-quarter revenue largely in line with Wall Street analysts forecasts but offered guidance that fell short of estimates. Poshmark reported a net loss of 22.9 million, or 29 cents a share, compared with a net loss of 2.55 million, or 3 cents a share, in the year-ago quarter. 