 Shares of Tronox Holdings PLC TROX, -1.03 slumped 2.6 in premarket trading Monday toward a seventh-straight loss, after the maker of titanium products warned about a third-quarter earnings shortfall, citing softer than anticipated titanium dioxide TiO2 sales. The company said it now expects adjusted earnings before interest, taxes, depreciation and amortization Ebitda of 240 million to 255 million, below previous guidance of 275 million to 295 million. 