RE:RE:RE:RE:RE:ACB trades at higher price on TSX Alpha Exchange Technically you're both incorrect. The Volume at 6.28 after hours (at 16:32:48) was 500 units. Due to the stock being over $1.00 every unit converts to 100 shares.
Therefore 500 units is 50,000 shares. As per Stockwatch "For Canadian stocks the board lot size depends on the previous close price. If the previous close is under $0.10 a board lot is 1000 shares. Otherwise if the previous close is under $1.00 a board lot is 500 shares. Otherwise a board lot is 100 shares. In some rare cases a board lot may differ from this formula." There was, however, a buy made previous to that which was 500,000 shares (5,000 units) that pushed it from 6.09 to 6.15 at 16:00:00 hrs.