Why Sierra Metals Inc (SMTS) stock went up in after-hours on Tuesday April 20?

Sierra Metals Inc (SMTS) stock gained 13.12% in the after-hours session on Tuesday, April 20, 2021, after losing -2.76% to close normal Tuesday’s session at $2.82. SMTS shares have risen by 264.39% over the last 12 months, and they have moved down by -1.05% in the past week. Over the past three months, the stock […]