I believe that the number is considerably higher Lucky. I know that we did an accounting of quite a number of shareholders and their share counts. It clearly revealed a strong majority. A Small number of folks have Multi million shares, several at the million level and the rest (the largest crowd ) of the shareholders varied amounts. I do believe it is in excess of 175, closer to 200 or more. I believe very few if any have relinquished shares. One private group of BioAmber shareholders has more than 200 members... I am sure a couple aren't shareholders.
A transfer agent would be the one to ask . The worthless cusip hasn't had one in years . But computershare trust company was before they resigned . Give them a call I'm sure they need a good laugh.