Tax Implications
Depending on the structure, transactions can be taxable or non-taxable. It is important to consult with a tax professional to determine which transactions meet your tax objectives.
Consent of Third Parties to Contracts
Be sure to review the material contracts that the selling company has in place. They may contain "no assignment" clauses, or they may require consent of the other party to the contract. If consent is required, obtain written consent from the other contract party before the closing. Generally, no consent is needed in a stock purchase or merger deal, unless the contract contains a provision that prevents an assignment if there is a change of control in the company. (Note: there may be exceptions to this rule in some jurisdictions.)