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?
replies(3):
Cisco is not allowed to use inside information about Splunk to make the acquisition either. So, if someone did the same analysis that Cisco did they could have drawn the same conclusion.
If this trader has a solid history of making many wild option contracts including many that didn't pay off, leading to average returns, then that's a strong case that this was random.
About the merger, but not about the exact date that it would be announced.
The question was, any way this could be legit.