Company practices killing off employees?

Regarding the company.

Would they really put a hit out on him? How many companies do you know that do this? How many big companies like that are privately owned - as from what I get from the movie they were only ABOUT to go onto the stock market.
So they were 100% privately owned up until that point?
How many big multi-billion dollar corporations do you know that are not on the stock market already! Especially not ones that deal in national interest areas like power and gas, oil etc... Doesn't make sense.
Even if it's plausible it was certainly not presented well in the movie.

The vibe I got instead, was one of a mafia clan rather than a multi-billion dollar corporation. Even his mother knew they'd kill him?! lol
It's like a Sopranos moment there.
I mean as using natural resources and people of a third world country for profit is one thing, but murdering high ranking execs. in the middle of NYC?

And let's talk about the hit. It was ridiculous to say the least.
Now the idea of buying paintings as payment for the hit was great, nice and easy way for company to do it 'legally'.
However the 'painter' then gets some lame-o junky lookalike to do the job?
And worse, with Frank Langella's character, they arrange for the time and date to do it?
That kind of stuff MAYBE happens in Japan with Yakuzas or in 12 o'clock noon cowboy showdowns! And usually always when they have something to blackmail the victim with. Like they could threaten to kill someone he cared for if he hadn't shown up but he had no one.
Well, one explanation could be that as his character knew he'd have a hit on him, this kind of stuff must've happened before at their company.
There must've been other hits and he knew he'd get it after what he did.
In that case he and his 'colleagues' also guilty of mafia like practice as mentioned earlier. But that's speculative.

Anyway the murder itself could've been done so much easier. Like back alley mugging or something like that. Shooting someone on a pier where they are out of place will only raise questions. What was he doing there? Dressed up?
Then the police would see who he worked for and they would have the reason to be suspicious of the company who had just lost billions. And that's the last thing they'd want.

This reminds me of attempted hit in Michael Clayton, that was a REALLY bad and incompetent way to blow up someone's car!
Now my guess is that all these incompetent killers come from the same school for hired guns. Sadly.