Insider trade on Splunk acquisition?

I don't know if this is genuinely suspicious or not. Is buying 20K of options an unusual thing? Or is this something that happens regularly with options expiring worthless or with a small gain - and it just happened to hit big this time?

IE "someone bought a lottery ticket and won" - interesting to know if they play the lottery every other day (and don't usually win?)

"short-dated out-of-the-money call options that cash out a day after a merger/acquisition" is, like, the definition of a suspicious transaction. Somebody's gonna get a knock on the door from the SEC.

But lottery-ticket options trading is done all the time. The fact that the options expire the next day is part of the strategy (because before that, the options cost more). $20k might sound like a big stake but you don't know the size of the trader's portfolio, it might be 0.01% of it, and they didn't stand to lose the whole thing necessarily.