Ero Copper is trading 4.1% up today at $26.27. * The company reported Q1 2026 EPS of $0.69, surpassing the analyst consensus of $0.56, with revenue of $263.2 million also exceeding expectations. * Institutional investor Arrowstreet Capital Limited Partnership increased its stake in Ero Copper by 4,913.8% in Q1, acquiring an additional 955,487 shares.