BUZZ-Sig: Margin pressures building on FY15 results
** Building materials supplier Sig Plc (LSE: SHI.L - news) falls as much as 6.8 pct after saying its margins were under pressure, hurt by lower than expected profit in mainland Europe
** Co reported 2.7 pct drop in H1 rev from cont ops and underlying pretax profit dropped 9.1 pct
** Top loser and most traded stock on the FTSE-250
** Stock trading at 1.1x a full day's avg volume within the first half
** Brokerage Goodbody analysts said Tuesday's fall in share price reflective of pressure on co to deliver on guidance and H2 bias of FY15 results (abhiram.nandakumar.thomsonreuters.com@reuters.net)