The Wikipedia page on Bombardier is ... not especially clear about present ownership, though apparently debt incurred developing the CSeries (Airbus 220) aircraft lead to spin-outs of much of the core business, including large shares (50% and then another acquisition) of CSeries ops by Airbus.
<https://en.wikipedia.org/wiki/Bombardier_Inc.>
The top of the article seems to portray Bombardier as an independent company, other bits not so much.
Shortly thereafter, Airbus came in and acquired a controlling stake of Bombardier Aviation, took over the CS planes, and agreed to manufacture them in the US (Airbus manufacturing is in the EU).
The way it played out seemed to me as if Boeing and Airbus conspired to kill off a viable competitor after they saw how well received the CS100 and CS300 were.
This is all on top of the overall financial troubles the company was facing.
I could be entirely off the mark, so I will let those more knowledgeable chime in from here.
De Havilland was owned by Bombardier, but Viking Air bought De Havilland's designs and Dash 8, and renamed the holding company De Havilland.