Berkshire Hathaway just disclosed that it dumped $1.6 billion into a sinking ship, and Wall Street instantly paid attention.

Warren Buffett’s Berkshire Hathaway revealed a position in embattled healthcare giant UnitedHealth Group while showing smaller stakes in longtime holdings Apple and Bank of America, according to a regulatory filing Thursday.

Bloomberg journalists discuss today's biggest winners and losers in the stock market. Listen for analysis on the companies making news on Wall Street.

Berkshire Hathaway’s portfolio added six new stocks, including the three new secret stocks. Warren Buffett was a net seller of stocks for the eleventh straight quarter.

The company may be under criminal investigation for alleged irregularities in its Medicare business—but it’s been touched by the Warren Buffett effect. Shares in the troubled private health insurer UnitedHealth Group (NYSE: UNH) are currently seeing their best trading day in months.

Berkshire’s Big Bet on UnitedHealth Berkshire Hathaway’s (NYSE:BRK-A)(NYSE:BRK-B) release yesterday of its latest 13F filing sent ripples through the market as it revealed a new 5 million share stake in UnitedHealth Group (NYSE:UNH) worth approximately $1.

Here are three of the stories Wall Street is watching on Friday, Aug. 15. Retail sales in July rose 0.5% from the month prior, slightly below the 0.6% economists polled by Bloomberg were expecting. US President Donald Trump and Russian President Vladimir Putin are meeting today in Alaska.

One figure from Berkshire Hathaway's latest operating results appears to be a telltale sign of trouble to come for the stock market.