How are the shares owned by the co-op handled in this count?

My family and I have been living into a co-op here in Brooklyn for five years. Every annual meeting, voting is based on the number of shares we own as opposed to one vote per apartment. How are the shares owned by the co-op handled in this count? Do we need 50% of the total shares outstanding to have a quorum? Or do we need only 50% of the tenant shareholder held shares?