FMDBL and MLBSL merger

What might be the expected change seen in the trading price of these stocks. Today both of the companies are trading lower than yesterday; MLBSL traded below 180 days average.

Also what might the shareholder of both of these companies expect after the merger happens.

Although the swap ratio is not yet decided, what might be the right swap ratio for this scenario where FMDBL is a bigger company with larger market capitalization but MLBSL share price is higher.