Typed too quickly.  Obviously I mean the S3(SUPP) form and not T3(SUPP)

The forms are still not finalized, but there will be an update released before tomorrow's NETFILE opening, so that might contain a fix for this issue.  

The number of securities isn't used in the calculation, though, at least not on the S3 (SUPP).

Thank You.  I shall check back after the next update.  Yes, the proceeds, cost and Cap Gain figures are correct.  As long as the CRA doesn't dive deep into the number of shares and flag incorrect share prices 🙃