NEW YORK (

TheStreet

) -- At least five members of

Research In Motion's

(RIMM)

enterprise saleforce team have jumped shipped to

Apple

(AAPL) - Get Report

in the past year, according to an informal study by a

Wall Street Journal

staffer. The news comes as RIM continues to shed market share to the iPhone maker and a few months ahead of RIM's effort to dive into the tablet market. Its PlayBook will reportedly debut in March.

Shares of RIM were 39 cents lower in pre-market trading at $59.10.

Apple has bought the grounds of

Hewlett-Packard's

(HPQ) - Get Report

former headquarters, reported

The Mercury News

. The 98-acre parcel of land, which real estate agents estimate to hold a price tag of about $300 million, is adjacent to 50 acres of land that Apple bought four years ago.

In Black Friday news, the

Apple Store

is featuring a bevy of savings on most of Apple's popular products, including about $100 off its Macs and about $40 off the iPad. The company, while not prone to holding big sales, has featured similar Black Friday deals for the past two years.

Shares of Apple were down 0.38% in pre-market trading to $313.61.

After its e-readers failed to catch on in its home country in 2004 and 2007,

Sony

(SNE) - Get Report

is trying again. In a couple of weeks, Sony will launch two new e-readers in an effort to gain share in the Japanese e-book market (the company says it holds about 30% of the U.S. e-reader market). Sony will launch its 5-inch-screen Pocket Edition and a 6-inch Touch Edition.

Shares of Sony were trading down 50 cents to $34.50.

Shares of

Amazon

, the world's largest online retailer, were rising 31 cents in pre-market trading on Black Friday to $177.56. While the store typically sees higher sales in the days immediately following Black Friday, the firm has already announced a host of sales on popular items, looking to capitalize on the growth in online shopping.

--Written by Maggie Overfelt in New York.

>To follow the writer on Twitter, go to

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.

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