There were 2 buys at exactly 2:29:59 with a total volume of...

There were 2 buys at exactly 2:29:59 with a total volume of 540,000 and another 3 buys at exactly 3:12:26 with a total volume of 320,000.
Based on the buys going through at exactly the same second I assume there is a good chance they were placed by the same 2 traders. Is this a fair assumption?
If so then these two traders are really stocking up.
In any case an individual buy of 425,000 is still significant on it's own, for such a small stock.