It could have several interpretations. 1. Brokerage house decided to hide the trade during the day and disclose it after hours. There were some trades with 10,000 shares where price was being manipulated for ask and bids. 2. Could be a trade to hide convertibles being executed. 3. SEC (because of formal complaints) could have sent a warning for scenario one and gave the brokerage house instructions to disclose those trades after hours.
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