RE:Wow. Osisko buying back on the way UP!
While I believe there are other reasons for their activity, here is one possible theory or part thereof:
Repurchases under the NCIB Program may commence on January 2, 2021 and will terminate on January 1, 2022 or on such earlier date as the NCIB Program is complete. Daily purchases will be limited to 357,614 Common Shares, other than block purchase exemptions, representing 25% of the average daily trading volume of the Common Shares on the TSX for the six-month period ending November 30, 2020, being 1,430,456 Common Shares.
...and they could always just renew this in the new year, so there's that.