NEW YORK (CNNMoney) - Ever since the news broke about Steve Wynn, investors have been selling shares of Wynn Resorts.
The stock is down 18 percent and at least one major institutional investor, Thornburg Investment Management, confirmed to CNN that it sold its entire stake of 891,000 shares on Jan. 26. That was the day a Wall Street Journal article revealed allegations of sexual misconduct by Wynn, its founder and CEO. Wynn has denied the allegations in the Journal story, calling them "preposterous."
Thornburg, which had been the 15th largest institutional investor in the company, wouldn't comment on the sale other than to confirm that the Journal report was "material" to its decision.
Shares in Wynn Resorts have been turning over in a big way. The day the Wall Street Journal report came out, 22 million shares traded -- most of them after the story published. And nearly 26 million shares were traded the following session. Each day had more than 10 times the average trading volume for Wynn Resort shares. And even though the shares haven't moved as much since the plunge those first two days, trading volume has remained elevated.
Institutional investors owned the overwhelming majority of the shares -- about 74 percent -- as of the end of September, the most recent figures available. In addition, 22 percent of Wynn shares are held by company insiders, such as Wynn himself, who owns nearly 12 percent of the company.
Insiders like top executives or board members need to file with the SEC within days after they buy or sell shares, and none have done so since the news broke about Thornburgh's sale.
Individual investors who aren't insiders hold only about 4 percent of the shares.
So for the stock to lose nearly 18 percent of its value in just a few days, institutional investors must have been selling heavily. Details of those sales won't be public until firms disclose their holdings in filings in the coming weeks. Unlike company insiders, institutional investors generally only have to disclose their sales quarterly unless they hold 5 percent or more of a company.
Of , ourse for everyone selling shares, there is someone else buying, trying to take advantage of the cheaper price. BlackRock boosted its Wynn stake by about 243,000 shares, increasing its total stake from 4.8 percent to 5 percent of the company, according to a filing Thursday. The company said it does not comment on specific investments.
Even with all the allegations of sexual harassment and misconduct that have become public in recent months, the Wynn case is the first in which the CEO of a major publicly traded company has been accused of misdeeds.
"This is uncharted territory," said Dan Wasiolek, an analyst with Morningstar.
Wynn Resorts is included in the S&P 500 so is held by funds that track the popular index. Those funds typically would only sell its Wynn holdings if Wynn Resorts were dropped from the S&P 500.
Vanguard is Wynn's largest institutional shareholder, with 8.2 million shares held mostly in index funds. "We won't divest from a company unless it falls out of the underlying benchmark," said Vanguard spokesman Freddy Martino, but he declined to comment specifically about Wynn.
The two biggest shareholders in the company are Steve Wynn himself and his ex-wife Elaine, whom he has been battling in court. Elaine Wynn owns 9 percent of Wynn Resorts stock, but probably can't sell it due to restrictions set in their divorce settlement.
Steve Wynn hasn't sold a single share of his stake, according to company filings. That has cost him dearly -- almost $440 million since the day before the Journal story detailed the allegations against him.
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