Here are five things you must know for Thursday, Nov. 15:

1. -- U.S. Futures Slightly Higher, Europe Mixed Amid Brexit Chaos

U.S. stock futures were rising modestly on Thursday, Nov. 15, while shares in Europe were mixed after the U.K. lawmaker tasked with leading Britain's exit negotiations with the European Union resigned.

The resignation of Dominic Raab, the so-called Brexit secretary, could throw the recently agreed to deal to take the U.K. out of the bloc into chaos and threaten the leadership of Prime Minister Theresa May.

Raab issued a statement on Twitter that indicated his inability to support May's agreement, which was reached Wednesday.  

The pound fell sharply following Raab's resignation on fears that it could trigger a wider leadership challenge for May and, possibly, fresh national elections in the United Kingdom early next year. Sterling was 1.6% lower against the U.S. dollar at 1.2800 in London.

Contracts tied to the Dow Jones Industrial Average rose 33 points, futures for the S&P 500 were up 3.50 points, and Nasdaq futures gained 27 points. Futures were higher on signs of progress in U.S. and China trade talks. U.S. government sources told Reuters on Wednesday that China had sent a response to U.S. demands for trade reform, raising hopes the two sides could resume talks to end their trade war.

On Wednesday, the Dow fell 206 points, or 0.8%, to 25,081, the S&P 500 tumbled 0.8%, and the Nasdaq slid 0.9%. Leading the Dow lower were Apple Inc. (AAPL - Get Report) , which slid into bear market territory, and Goldman Sachs Group Inc. (GS - Get Report) . Travelers Cos. (TRV - Get Report) , the insurance company with significant exposure to liabilities stemming from the California wildfires, fell 3.4%.

The economic calendar in the U.S. Thursday includes weekly Jobless Claims at 8:30 a.m. ET, the Philadelphia Fed Business Outlook Survey for November at 8:30 a.m., and Retail Sales for October at 8:30 a.m.

2. -- Cisco Jumps After Topping Profit and Sales Estimates

Cisco Systems Inc.'s  (CSCO - Get Report)  fiscal first-quarter earnings topped analysts' expectations on both the top and bottom lines.

Shares of the networking giant rose 3.5% in premarket trading on Thursday.

Earnings on an adjusted basis were 75 cents a share on revenue of $13.1 billion. Wall Street analysts had expected adjusted earnings of 71 cents a share on revenue of $12.89 billion.

"We had a strong start to fiscal 2019 and we believe our opportunity has never been greater," said Chairman and CEO Chuck Robbins. "Our strategy is working and we are well positioned with our growing and differentiated portfolio across multiple domains to bring our customers a more secure, automated and simple IT infrastructure."

Jeff Marks, senior portfolio analyst for Jim Cramer's Action Alerts PLUS portfolio, which owns Cisco, noted that "Cisco announced great fiscal first-quarter results, accelerating top line growth -- a rarity for a company of its size -- and delivering double-digits earning growth."

3. -- Walmart and Nvidia Highlight Thursday's Earnings Calendar

Walmart Inc. (WMT - Get Report)  earned $1.08 a share on an adjusted basis in the third quarter, beating analysts' estimates of $1.01. Revenue of $124.9 billion in the quarter missed forecasts of $125.4 billion. U.S. comparable-store sales in the quarter rose 3.4%; analysts expected 3.1%.

It also boosted earnings guidance for its next fiscal year.

The stock was up 1% in premarket trading.

Earnings are also expected Thursday from Nvidia Corp. (NVDA - Get Report) , Applied Materials Inc. (AMAT - Get Report)  and Nordstrom Inc. (JWN - Get Report) .

4. -- Warren Buffett Buys $4 Billion Stake in JPMorgan

Warren Buffett's Berkshire Hathaway Inc. (BRK.A - Get Report) announced a new investment position in JPMorgan Chase & Co. (JPM - Get Report)  , adding to its already large investments in other financial stocks such as Goldman Sachs Group Inc. (GS - Get Report) , Bank of America Corp. (BAC - Get Report) and Wells Fargo & Co. (WFC - Get Report) .

According to 13-F filings with the Securities and Exchange Commission, Berkshire Hathaway bought more than 35 million shares of JPMorgan valued at about $4 billion as of the end of the third quarter. JPMorgan rose 1.6% in premarket trading.

Buffett also raised his stake in Apple, buying 522,802 shares during the third quarter. Berkshire Hathaway now owns a little more than 5% of Apple's outstanding shares.

JPMorgan Chase, Goldman Sachs and Apple are holdings in Jim Cramer's Action Alerts PLUS member club. Want to be alerted before Jim Cramer buys or sells the stocks? Learn more now.

5. -- Uber Posts Quarterly Loss of More Than $1 Billion

Uber Technologies Inc. posted a third-quarter loss of $1.07 billion, wider than its second-quarter loss of $891 million, as the ride-sharing company prepared for an initial public stock offering next year.

Revenue in the third quarter was $2.95 billion, up 5.4% from the second quarter. Gross bookings jumped 6% to $12.7 billion.

"As we look ahead to an IPO and beyond, we are investing in future growth across our platform, including food, freight, electric bikes and scooters, and high-potential markets in India and the Middle East where we continue to solidify our leadership position," said Chief Financial Officer Nelson Chai in a statement.