In the movie Margin Call (2011), Peter Sullivan who is a Risk Analyst (not a partner or major investor in the firm), after being given a thumb drive with some data, discovers late at night (once everyone has left) that the firm he is working for will very soon be bankrupt once some MBS (Mortgage Backed Securities) products lose a fraction of their value. The data shows that the firm has essentially ignored the risk of their assets while the market is starting to turn into a recession.
Considering that Peter is not a high-ranking member of the firm (later in the film, it's made very clear that he is attending meetings with people who are so high-up in the firm he has never seen or met them), has no known worthwhile contributions in the firm (it can be inferred that he has not been there for a significant period of time and no financial stake with the firm) and has no real incentive to do anything (again, he's not a partner or important individual at the firm).
Obviously an employee should help their company but consider that the data shows just how damaged of a state the firm is in, the likelihood he will be let go very soon (the firm has already laid off his boss and dozens of other employees), and the fact that he's basically a nobody there (and nobody knows he has the data). There does not seem to be a valid reason for his character to speak up or do something.
Why would he do anything or be as concerned as he is? Is there prerequisite knowledge assumed by the filmmakers that is just not known? Is it something related to financial services and the investment banking industry?