Markets & Economy Tamarack Valley, Headwater Exploration agree $7.2bn all-stock merger September 8, 2026 · 2:35 pm 1 sources Image: Yahoo Finance ad slot · in-content video 16:9 Coverage More coverageTamarack Valley, Headwater Exploration agree $7.2bn all-stock mergerYahoo Finance · September 8, 2026 14:35