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Here are five things you must know for Thursday, Aug. 24:

1. -- U.S. stock futures suggested Wall Street would open higher on Thursday, Aug. 24, European stocks gained and Asian shares closed mixed as the annual gathering of central bankers in Jackson Hole, Wyoming, kicked off.

This year's topic: "Fostering a Dynamic Global Economy." Federal Reserve Chair Janet Yellen and European Central Bank President Mario Draghi are expected to speak at the event on Friday, Aug. 25. 

Investors will parse Yellen's language to determine whether the Fed will begin unwinding its balance sheet in September. The central bank previously said that was a move that it would implement "relatively soon," provided the economy expands as expected. Paring the Fed's sizable assets would likely tighten monetary conditions in the same way an interest-rate hike would. Another rate increase isn't expected until December at the earliest. 

The economic calendar in the U.S. on Thursday also includes weekly Jobless Claims at 8:30 a.m. ET, and Existing Home Sales for July at 10 a.m.

U.S. stocks on Wednesday, Aug. 23, closed lower as Lowe's Cos. (LOW) - Get Report  led losses in the consumer sector, while defense names gave back gains. 

The Dow Jones Industrial Average fell 0.4%, the S&P 500 declined 0.34%, and the Nasdaq slid 0.3%.

Watch: 3 Things to Watch in Janet Yellen and Mario Draghi's Jackson Hole Speeches

2. -- Uber Technologies Inc., the ride-hailing startup, narrowed its losses in the second quarter, while gross bookings jumped 17%. 

Uber said it posted a loss of $645 million in the second quarter, narrower than the $708 million loss in the first quarter and the $991 million loss in the fourth quarter of fiscal 2016. Revenue was $1.75 billion, up from $1.5 billion in the first quarter and about $800 million during the same period a year earlier. Gross bookings, or total money collected by fares, jumped to $8.7 billion.

Uber has $6.6 billion cash on hand, compared to about $7.2 billion in the first quarter.

The company is continuing its search for a new CEO and Meg Whitman, chief executive of Hewlett Packard Enterprise Co. (HPE) - Get Report , repeated that she won't take the top spot at Uber.

Sears Holdings Corp. (SHLD) reported a second-quarter adjusted loss of $1.16 a share vs. a year-earlier loss of $2.03. Sales were $4.37 billion compared with $5.66 billion in the same period last year.

Sears said Thursday it was still exploring opportunities for its Kenmore and DieHard brands. It also said it would close 28 Kmart stores later in 2017.

Tiffany & Co. (TIF) - Get Report  reported second-quarter earnings of 92 cents a share vs. 84 cents a year earlier as sales rose to $959.7 million from $931.6 million.

Earnings reports are also expected Thursday from Abercrombie & Fitch Co. (ANF) - Get Report , Broadcom Ltd. (AVGO) - Get Report , Staples Inc. (SPLS) , Perry Ellis International Inc. (PERY) - Get Report , GameStop Corp. (GME) - Get Report , JM Smucker Co. (SJM) - Get Report , VMware Inc. (VMW) - Get Report , Marvell Technology Group Ltd. (MRVL) - Get Report  and Brocade Communications Systems Inc. (BRCD)  .

Broadcom is a holding in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio. Want to be alerted before Cramer buys or sells AVGO? Learn more now

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3. -- A consortium that includes Western Digital Corp. (WDC) - Get Report is offering 1.9 trillion yen ($17.4 billion) for Toshiba Corp.'s  (TOSYY) memory chip business, Reuters reported, citing sources.

Western Digital is set to offer 150 billion yen through convertible bonds and won't seek voting rights in the business, sources familiar with the deal said.

The consortium also includes private-equity firm KKR & Co. (KKR) - Get Report  as well as state-backed Innovation Network Corp. of Japan and Development Bank of Japan, the sources told Reuters.

Toshiba, the Japanese conglomerate, has been trying to sell its its memory chip business to cover losses from its U.S. nuclear business.

4. -- Facebook Inc. (FB) - Get Report has named Andrew "Boz" Bosworth, one of the social media giant's veteran executives, to lead all of its consumer hardware efforts, including the mysterious Building 8 division responsible for its forthcoming video chat device, Business Insider reported.

Bosworth will oversee Building 8 and Oculus, Facebook's virtual reality arm, according to Business Insider. The announcement was recently made inside the company by Facebook's chief technical officer, Mike Schroepfer, and a spokesperson confirmed the news to Business Insider.

Bosworth has been at Facebook for more than a decade and was instrumental in helping to create News Feed and Messenger, according to Business Insider. He's also a close confidant to CEO Mark Zuckerberg.

Facebook is a holding in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio. Want to be alerted before Cramer buys or sells FB? Learn more now.

5. -- A single winning Powerball ticket matching all six numbers was sold in Massachusetts.

Powerball Product Group Chair Charlie McIntyre told the Associated Press that the $758.7 million jackpot claimed by a ticket sold in Massachusetts was the largest grand prize won by a single lottery ticket in U.S. history. The ticket was sold at the Handy Variety convenience store in Watertown.---

McIntyre also said six other tickets won $2 million apiece, and 34 more won $1 million.

The lucky numbers: 6, 7, 16, 23 and 26, and a Powerball number of 4.

Watch: 5 Biggest Powerball Prizes in History

Updated from 6:07 a.m. ET

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