Is there any legit way in which whoever made this trade could have got a wind of a potential acquisition without relying on inside knowledge?
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Maybe this whale was tracking tail numbers, drove down to the executive airport, and saw that Cisco's chief M&A guy had a huge grin on his face as he stepped onto the plane.
(Okay, I doubt that highly, but it is a scenario)
For example, a Printer for Business Week and a Stock Broker traded on pre-publication information and were convicted of insider trading.
https://corporateinsiderstrading.wordpress.com/2012/02/01/bu...
They traded on information that was non-public at the time of the trade. Why shouldn't that be treated exactly as trading on news of this merger before it was announced? (The merger was eventually going to be known to the public as well, right?)