Umpteenth time: This was a Chapter 15 bankruptcy recognizing the CCAA proceedings in Canada as the foreign main proceedings. Just like the US has Chapter 7 and Chapter 11, Canada has the BIA and CCAA. While in the CCAA, the company was liquidated and shut down, assets sold to LCYB including the plant and all the IP (patents). There is no company left.
The parent company was in the US, so, yes, Chapter 15 is bankruptcy. Since the case was closed (use any word you want for it, it was completed), that parent company has had its corporate charter voided by the state of Delaware. BioAmber, Inc., the issuer of the stock, no longer exists. The Canadian Federal government has finally gotten around to dissolving the two subsidiaries.
Quibble with words all you want, the company is dead, has been for 6 years, the stock is dead, has been for nearly 5 years.