It’s a big day for Trump Media stock. The market is closely watching any move by Donald Trump and other big investors’ today as a lockup period that until now has barred any insider investors from selling shares expired.

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.

That could change if insiders such as Trump, the current Republican presidential nominee, decide to sell their stock and increase the number of shares in circulation. “Not only