"Very often, the two expressions "merger" and "amalgamation" are taken as synonymous. But there is, in fact, a difference.

Merger is restricted to a case where the assets and liabilities of the companies get vested in another company, the company which is merged losing its identity and its shareholders becoming shareholders of the other company.

Co. A <--Co.B ==Co. A . ie., Co. B is swallowed by Co. A

On the other hand, amalgamation is an arrangement, whereby the assets and liabilities of two or more companies become vested in another company (which may or may not be one of the original companies) and which would have as its shareholders substantially, all the shareholders of the amalgamating companies."

Just like:

Co.A + Co.B == Co.C