It means that BioAmber Inc. owns that subsidiary...wait for it...wait for it...wholly.
For example, "wholly owned subsidiary" would not be used if a company were only partially owned by BioAmber Inc. (think of a phrase something like "partially owned subsidiary"), which used to actually be the case when Mitsui owned a portion of BioAmber Sarnia Inc.
However, Mitsui sold their stake in BioAmber Sarnia Inc. to BioAmber Inc. in the fall of 2017.
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