GOP nominee's debate with Harris causes Trump Media shares to plummet premarket.

• The stock price of Trump Media plunged in pre-market trading.
• A day after facing Vice President Kamala Harris in a presidential debate hosted by ABC News, former President Donald Trump's son, DJT, dropped.
• Before the debate, the share price of the company that owns Truth Social had increased.

On Wednesday, the share price of plummeted over 14% before the opening bell, following a poor presidential debate performance by its majority shareholder, Donald Trump, the day before.

Betting on the political success of Trump, the Republican presidential nominee, has become synonymous with investing in the Truth Social maker's stock.

The success of the company is linked to Trump's popularity, and its value will fluctuate depending on his election outcomes.

The decline in stock prices following the debate could indicate that some of Trump's supporters were dissatisfied with the proceedings on Tuesday night.

Political commentators from both sides of the spectrum agreed that Harris was more composed, articulate, and even-tempered during the Philadelphia debate than Trump, who frequently lost his cool when Harris tried to steer the conversation away from his preferred topics.

Trump was immediately challenged to another debate by Harris' team, who exuded confidence after the first one ended.

Trump said he may not agree to another one.

On Tuesday, DJT, the stock symbol for Trump Media, experienced a 10% increase in intraday trading, potentially reflecting positive expectations regarding Trump's performance in the debate.

The company's gains on Monday and Tuesday provided a brief relief from a weekslong slump that has seen shares plummet as much as 75% from their intraday high in late March, when Trump Media merged with a blank-check firm.

The coincidence of the slump occurred when President Joe Biden withdrew from the presidential race and endorsed Harris to succeed him as the Democratic ticket's top candidate.

In anticipation of the date when Trump and other insiders can sell their shares, it was also announced.

Nearly $2 billion is the value of the nearly 59% stake in the company that Trump owns.

It is uncertain if Trump intends to sell his stake when the lock-up agreement expires on September 19.