Nasdaq Stocks Show Wild Swings; Exchange Cites Third Parties

Issue was caused by data providers, not Nasdaq: spokesman.

Nasdaq Stocks Show Wild Swings; Exchange Cites Third Parties
A customer views an Apple Inc. iPhone at a Maxim Store in Buenos Aires, Argentina. (Photographer: Pablo E. Piovano/Bloomberg)

(Bloomberg) -- Erroneous prices of Nasdaq stocks, including some of the world’s biggest technology companies, flooded traders’ screens after the U.S. market shut early Monday before a holiday.

The prices were distributed by third-party data providers after Wall Street closed early for the July 4 break. The exchange operator was conducting a test of its pricing data feed that led to some providers, including Google Inc. and Bloomberg LP, the parent of Bloomberg News, showing exaggerated moves in shares such as Apple Inc. and Microsoft Corp. that never occurred, according to spokesman Joe Christinat. The test data is sent daily, he said. Nasdaq is working with the providers to resolve the issue, he said.

The apparent swings came on a day that the U.S. stock market closed three hours earlier than usual at 1 p.m. While Nasdaq’s website said its systems were operating normally, trading screens around the world showed the likes of Inc. and Microsoft’s shares appearing to fall by more than 50 percent. Apple’s stock was at one stage looking as if it had risen 348 percent. The data showed more than a dozen securities, including Nasdaq’s own company stock, at the same price, $123.47.

“I’m surprised it doesn’t happen more often,” considering the complexity of today’s financial markets, said James Angel, a finance professor at Georgetown University in Washington. “We want these mistakes to happen when the market is closed on a holiday, rather than when the market is open for business.”

Stock Feeds

Nasdaq and NYSE Group Inc., a unit of Intercontinental Exchange Inc., each run central data feeds that are the industry standard bearers. The essential information they provide includes price quotes and trades that were executed. Each company also sells more detailed, fast-moving proprietary data feeds that traders can purchase for additional fees.

“There is no technical issue at Nasdaq,” Christinat said, adding that no trades were made at the incorrect prices. “Bloomberg and a few other providers improperly disseminated test data.”

Google said it had also been affected. “Our third-party finance data partner was providing some inaccurate information, which they received from Nasdaq,” a spokesperson said in an emailed response to questions. Another data provider, Yahoo Finance, also published the incorrect prices, the Wall Street Journal Reported. A spokeswoman for Yahoo parent Verizon Communications Inc. couldn’t immediately be reached for comment. A Bloomberg LP spokeswoman declined to comment.

Nasdaq has had previous issues with its pricing data feed. In 2013, the exchange halted all trading in its listed stocks for about three hours because of a fault with the feed.

(A previous version of this story was corrected to remove reference to Nasdaq error.)

--With assistance from Robert Fenner

To contact the reporters on this story: Annie Massa in New York at, Alex Webb in San Francisco at

To contact the editors responsible for this story: Rob Urban at, Sam Mamudi