** Shares of Acerinox ACX.MC fall 3.9% after its Q1 net profit slumped as tariff-related uncertainties and an adverse backdrop caused markets to slow down and postponed an awaited demand recovery
** The Spanish steelmaker books a net profit of 10 million euros ($11.28 million) in Q1, down 81% from a year ago
** The company also flags concerns that production that previously supplied North America would now flood the EU and hurt its business there
** The shares are at the bottom of Madrid's IBEX 35 .IBEX index, which falls 0.2%
** Including Thursday's fall, the stock has gained 4.6% YTD
($1 = 0.8863 euros)
(Reporting by Joao Manuel Mauricio)
((JoaoManuel.VicenteMauricio@thomsonreuters.com))