Shares of Sportsman’s Warehouse Holdings Inc. SPWH, +1.61% skyrocketed 37% in after-hours trading Monday following news it is being acquired by privately held Great American Outdoors Group, which already owns Bass Pro Shops, Cabela’s, White River Marine Group and nature-based resorts. Sportsman’s Warehouse will be acquired for $18 per share in cash. The company’s stock closed at $12.65 on Monday.