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| Year | Name | Direction | From/To | Category |
|---|---|---|---|---|
| 1935 | Henry Herbert Stevens | Lost | to Reconstruction Party | Started New Party |
| 2005 | Belinda Stronach | Lost | to Liberal | Wanted Promotion |
| 2006 | David Emerson | Gained | from Liberal | Wanted Promotion |
| 2013 | Brent Rathgeber | Lost | to Independent | Stood on Principle |
| 2013 | Dean Del Mastro | Lost | to Independent | Kicked Out |
| 2018 | Leona Alleslev | Gained | from Liberal | Changed Beliefs |
| 2018 | Maxime Bernier | Lost | to People's Party | Started New Party |
| 2025 | Michael Ma | Lost | to Liberal | Joined Government |
| 2025 | Chris d'Entremont | Lost | to Liberal | Joined Government |
| 2026 | Matt Jeneroux | Lost | to Liberal | Joined Government |
| 2026 | Marilyn Gladu | Lost | to Liberal | Joined Government |