Do Institutions Own Tamarack Valley Energy Ltd (TSE:TVE) Shares? Simply Wall St Reblog Want to participate in a short research study ? Help shape the future of investing tools and you could win a $250 gift card! Every investor in Tamarack Valley Energy Ltd ( TSE:TVE ) should be aware of the most powerful shareholder groups. Generally speaking, as a company grows, institutions will increase their ownership. Conversely, insiders often decrease their ownership over time.