NEW YORK ( TheStreet) -- Thoratec ( THOR), the Pleasanton, Calif.-based maker of heart pumps, gave a mixed full-year outlook. The company said it now sees non-GAAP earnings of $1.48 to $1.52 a share for the full year on revenue ranging from $418 million to $423 million.

The current average estimate of analysts polled by Thomson Reuters is for a profit of $1.49 a share on revenue of $428.4 million.

Shares were plunging 10.3% to $31.29.

Networking equipment maker JDS Uniphase ( JDSU) topped Wall Street's expectations for its first-quarter results. On a non-GAAP basis, Milpitas, Calif.-based JDS reported a profit of $40.9 million, or 18 cents a share, on revenue of $421.1 million.

The average estimate of analysts polled by Thomson Reuters was for earnings of 13 cents a share in the period on revenue of $415.1 million.

JDS also lowered the revenue outlook for its current second quarter to reflect the impact of flooding in Thailand. The company said it now sees revenue ranging from $375 million to $405 million for the period, a reduction of $35 million to $45 million. Wall Street's current consensus view is for revenue of $446.5 million.

Shares were jumping 6.7% to $12.25.

MasterCard ( MA) reported third-quarter profit of $5.63 a share, beating the Wall Street consensus target of $4.82.

Shares were gaining 6.5% to $355.94.

Sony ( SNE), the Japanese electronics giant, reported a fiscal second-quarter loss of 27 billion yen ($346 million) and said it expects an annual loss for the fourth year in a row.

Sony said it expects an annual loss of 90 billion yen; it previously expected a net profit of 60 billion.

Shares were tumbling 5.1% to $18.70 in premarket trading Wednesday.

Video, high-speed Internet and phone services provider Comcast ( CMCSA) reported third-quarter earnings of 33 cents a share, missing the average analyst estimate of 40 cents. Earnings per share rose 6.5% from the previous year.

Shares were spiking 1.6% to $23.35.

Yahoo! ( YHOO) is pitching private-equity firms about an arrangement in which they could take a minority stake in the Internet company while effectively gaining control, people familiar with the matter told The Wall Street Journal.

Shares were rising 1.4% to $15.14.

Teva Pharmaceutical ( TEVA) said third-quarter net profit excluding items fell from a year earlier but came in above analysts' estimates.

Sales rose 2% to $4.34 billion. North-American generic-drug sales fell 48% to $845 million, but Teva CEO Shlomo Yanai said he expects a "strong fourth quarter including an improved U.S. generics business."

Shares were falling 1.1% to $38.65.

Media and entertainment company Time Warner ( TWX) reported third-quarter earnings of 79 cents a share, beating the average analyst estimate of 76 cents. Shares were rising 1.1% to $34.20.

Kraft Foods ( KFT) is expected to earn 55 cents a share in the third quarter. Analysts are expecting sales of $12.81 billion.

MF Global ( MF) reportedly is being investigated by the FBI on whether client funds are missing.

Web services company AOL ( AOL) reported a third-quarter loss of 2 cents a share, narrower than the loss of 6 cents a share that analysts, on average, were expecting.

-- Written by Joseph Woelfel and Andrea Tse

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