You are correct. The AH trades have a total of 246.7K, accounts for 41% of the total shares exchanged hands.
If the big seller theory is true, then I should not count AH form T trades in the total. The big sellers' selling accounts for 70% of the total shares exchanged hands.
PS. Big seller theory: MM selling shares on behalf of one or a few big sellers during the regular hours, then the big sellers replenish the shares to MM after hour at a discount, with the discount being the fees for MM.
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