Md. Code, Financial Institutions § 3–719

(a) The owner of shares of stock that were voted against a consolidation, merger, or transfer of assets is entitled to receive the fair value of those shares, in cash, if the transaction becomes effective.

(b) A stockholder who desires to receive payment of the fair value for shares under this section, within 30 days after the transaction becomes effective, shall:

(1) Make a written demand on the successor for payment; and

(2) Surrender the stock certificates.