Basic materials stocks face a copper reality check after the long weekend as XLB slips
cNEW YORK, Jan 17, 2026, 14:40 ET — Market closed. Basic materials stocks slipped to finish the week, with the Materials Select Sector SPDR ETF (XLB) dropping 0.6% on Friday. The S&P 500 Materials sector index also edged lower, falling 0.44%. (Investing) This shift is significant since the sector has heavily relied on copper’s rally, which just faltered. Prices slipped…