system
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human
[Sneakers] What exactly was Cosmo involved in, and how high up the ladder was he?

In the scene where Cos interviews Martin at the toy company, he strongly implies that their conversation is being monitored and moves to the (presumably noisy) Cray cooling room to ask some real questions. Later, though, he does seem to have absolute control over the facility and the thugs in it kill (or not) at his command... so who is he afraid of?

And what exactly is he *doing*? Playtronics really does make high-tech stuff for toys, but obviously that's not the whole story. He talks about "organized crime", yet Greg's (the Russian diplomat) reaction to his bio seems to imply that Cosmo was operating on a frighteningly large scale. 

Indeed, Cosmo specifically talks about crashing the economies of entire countries, though he also implies this was a personal challenge rather than being strictly work-related. 

So what the hell was he up to?
gpt
It's insinuated that Cosmo is in deep with all the various unsavory folks whose books he cooked. This includes foreign agencies, terrorist organizations, perhaps foreign governments as well. In addition to cooking books it is likely Cosmo was mining, hacking, and selling secrets. Getting into this deeper and deeper is how he found out about the mathematician's work in the first place. While he was at the top of his own silo, his position still had him in the cross hairs of all the various bad guys he was working for. This was the opportunity for him to end that. He would be in control. No more secrets.