There are tricks. I've been through such an acquisition. The purchaser sets up a new "Philz Coffee Co LLC" then purchases assets and operations for the exact amount the preferred stock holders want. They then liquidate the old company. Because the old company was never legally "bought" the common stock holders are SOL because they now own stock in a fictional company. That's not to say they don't have options... but I am not a lawyer and that definitely involves lawyers.