** Shares in Siltronic WAFGn.DE fall 4.5% after the German semiconductor materials supplier cut its FY EBITDA margin guidance, citing uncertainty over the impact of U.S. tariffs
** Siltronic now expects FY EBITDA margin of 21% to 25%, vs 22%-27% previously targeted
** It keeps 2025 sales guidance unchanged, but says it is not yet possible to estimate the impact of the tariffs and the corresponding countermeasures on expected end-market growth and FX rates
** Jefferies says that new EBITDA margin guidance is 4% below consensus at mid-point
** "Demand for wafers continues to be subdued with inventories still at elevated levels at semi manufacturers, and timing of normalization is still uncertain," the broker adds
** Belgium's microelectronics manufacturer Melexis MLXS.BR shares are also down 3% after posting a 18% drop in its Q1 sales
** Siltronic, which has lost 19.8% YTD, hits the bottom of Germany's small-cap index .SDAXI
(Reporting by Ozan Ergenay)
((ozan.ergenay@thomsonreuters.com))