Donald Trump has vowed not to sell his Trump Media shares after a lock-up period expires Thursday. The company's shares are down 81% from their peak.

The volatile Trump Media stock will face a crucial day tomorrow. Donald Trump and other insider investors in the Truth Social parent company will be able to sell shares as the lockup period after the March merger with a blank-check firm expires.

Remember, Trump Media's primary fundamental is Donald Trump. It is why the stock, even at $15, sells well above a typical fundamental evaluation. Add in the stock's potential strengthening and the Trump brand could likewise strengthen.