NEW YORK (TheStreet) -- Shares of Vital Images( VTAL) were surging 31.5% to $18.64 in premarket trading Thursday after the medical software maker garnered a hefty premium in an acquisition agreement with Japan's Toshiba Medical Systems.

Cloud optimization services company

Akamai Technologies

(AKAM) - Get Akamai Technologies, Inc. Report

was falling 12.2% to $35.99 after edging quarterly profit expectations by a penny,

but spooking investors during its conference call.

Power company

Exelon

(EXC) - Get Exelon Corporation Report

agreed to buy rival Constellation Energy( CEG)

in an all-stock transaction for $38.59 a share, or $7.9 billion. Shares of Constellation Energy were surging 6.7% to $36.60, while Exelon was rising 0.5% to $41.69.

Consumer staples giant

Procter & Gamble

(PG) - Get Procter & Gamble Company Report

was falling 1.6% to $63 in premarket trading Thursday after reporting third-quarter earnings of 96 cents a share vs. the average analyst expectation of 97 cents a share.

Coffee chain

Starbucks

(SBUX) - Get Starbucks Corporation Report

was falling 0.7% to $36.94 after beating quarterly expectations,

but offering weaker-than-expected 2011 profit guidance.

Software maker

Microsoft

(MSFT) - Get Microsoft Corporation (MSFT) Report

was rising 0.3% to $26.47 ahead of its third-quarter earnings report, scheduled for after the markets close Thursday. Analysts, on average, are expecting profit of 56 cents a share. Microsoft continues to offer outstanding metrics, including a return on equity, the most important profitability measure for shareholders, of 42% in the latest quarter,

twice the industry average

and three times the

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S&P 500

average.

Oil giant

Exxon Mobil

(XOM) - Get Exxon Mobil Corporation Report

was rising 0.2% to $87.98 ahead of its first-quarter earnings report Thursday. Wall Street is calling for earnings of $2.06 a share.

Food and beverage giant

PepsiCo

(PEP) - Get PepsiCo, Inc. Report

reported first-quarter earnings of 74 cents a share vs. the average analyst expectation of 73 cents a share.

Flat panel TV maker

Panasonic

( PC) plans to slash 17,000 jobs over the next two years.

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