In a merger by absorption, the absorbed companies are integrated into another company that already exists. The latter acquires, as a result of the transaction, the assets and liabilities of the absorbed companies.
As for the partners of the extinguished companies, they participate with the partners of the company resulting from the merger, with a number of shares proportional to the number of shares they held in the extinguished company, and as a result, the capital stock of the absorbing company will increase by the proportional amount.