Shares of former President Donald Trump’s social media company plunged Monday after the company filed to register the potential sale of tens of millions of additional shares.

Trump Media & Technology’s stock fell 18.3%, erasing hundreds of millions of dollars from the company’s market value — and putting a dent in Trump’s majority stake. Since a surge in its first days of trading as Trump Media, which lifted the value of the company to about $8 billion at one point last month, the company’s shares have dropped by about 60%.

Trump Media was expected to register the potential sale of new shares after the completion of its merger last month with Digital World Acquisition, a cash-rich shell company known as a SPAC, or special purpose acquisition company. Companies that merge with SPACs typically file a registration statement a few weeks after the deal is completed for the sale of additional securities held by early investors.

In the filing, Trump Media — the parent company of Truth Social — registered more than 146 million shares of stock that could be sold, along with 21 million shares that were converted after the exercise of warrants, which enable an investor to buy shares at a preset price. When a SPAC goes public, it issues warrants to investors that can later be converted into shares.

Even though the company said the investors weren’t planning to sell those shares immediately, investors reacted to the notion that if a flood of new shares were to hit the market, they could depress the company’s stock price.

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Also included in the filing were an additional 36 million shares given to Trump as part of an “earnout” bonus based on the company’s stock price. With those additional shares, Trump has about 115 million shares of Trump Media, or 65% of the company’s stock.

Some of the shares registered for sale included stock held by large hedge funds such as Anson Funds, Hudson Bay, Mangrove Partners and Washington Muse Investments, which had acquired discounted shares or warrants from Digital World before the merger with Trump Media. Others had built up stakes in the company by buying warrants.

Trump Media will not receive any of the proceeds from shares sold by investors, but it could receive tens of millions in cash from the exercise of the warrants.