2. Natural disasters
3. Company mergers
4. Change in a company's management
1) Depends on whether investors perceive it as a good/bad thing.
2) Depends whether they directly affect the company's operations. They're usually perceived as a setback, unless god-forbid the entire company comes collapsing down.
3) Usually a good thing, but can depend entirely on what company it's being merged with (if investors don't like the other company, this can really backfire on the price).
4) Usually doesn't affect much. Investors don't really mind. What they don't like are staff quitting key positions (CEO, CFO, etc.). That is usually a bad signal.
1. Job Cuts
2. Natural disasters
3. Company mergers
4. Change in a company's management