Just like anyone that might be buying or selling - they don't want anyone else to know. Chung essentially did it that way. Think about how he did it and what his buys were - quickly over 3 days. Then, when it was known, it was published all over the place and ran up 4 cents +. If he had bought the 600K, then waited to buy the remaining million shares, it would have cost him an extra $40,000 - minimum.
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