https://www.lesprom.com/en/news/13_biggest_lumber_companies_...
*Four of the top ten largest firms are based in B.C. (West Fraser, Canfor, Interfor and Tolko), with the first three holding substantial sawmilling assets in the U.S.*
So it seems these Corps own assets on both sides of the border and it isn't clear how these tariffs help them. From what I understand (possibly wrong,) there has even been more consolidation in the Lumber Industry in the last couple of years and like 5 Companies own all the Sawmills on both sides of the border.