I'm sure this is a simple issue and probably been answered somewhere before, but I'm not sure where to look.

What happens after company A offers to buy company B for $10 a share, but the sale won't be finalized for 90 days... will the stock price for company B essentially be capped at $10/share until the sale is complete, or can it go higher? Should I just sell my shares in company B now (which are right near $10) and let the money work for me elsewhere (ie, will the share prices not go any higher, or return to $10, when the company B is "bought" in 90 days)?

Thanks.
MH