If a company is bought by another company, does my stock rollover to the new company when it is combined with the new parent company?
company is bought by another company
This depends on how the deal is structured, it varies from case to case basis. Plus it is also how much percentage the new company is buying, the local regulations.
All Cash Deal: Everyone of the old company is given cash at valuation rate. You can on your own buy shares in new company.
Share Swap: The Swap ration is defined, for every "x" of old shares you get "y" of new shares. Note this may at times leave some fraction shares and these are cashed out.
Part Share / Part cash: Combination of above two.
Retain as same: In this only the promoters shares are purchased as stage one. So nothing happens to your shares, you retain them as earlier.