Samsung Electronics recently offered to buy BlackBerry for as much as $7.5 billion, seeking its valuable patents as it battles Apple in the corporate market.

This is according to a person familiar with the matter and documents seen by Reuters. 

South Korea's Samsung proposed an initial price range of $13.35 to $15.49 per share, representing a premium of 38-60% over BlackBerry's current trading price, the source said today. 

Representatives from the two companies, which are working with advisers, met last week to discuss a potential transaction, the source said, asking not to be identified because the conversations are private.

The Ontario-based company said in a statement that it "has not engaged in discussions with Samsung with respect to any possible offer to purchase BlackBerry". 

Shares of BlackBerry, which soared nearly 30% following the Reuters report, fell back about 15% in after-hours electronic trading following the statement. 

Samsung also told Reuters in Seoul that it has no plans to acquire Blackberry. "Media reports of the acquisition are groundless," a company spokeswoman said.

Separately, Canadian newspaper Globe and Mail reported today that BlackBerry has shunned a handful of takeover overtures in recent months as its board and largest investor think its restructuring strategy will deliver greater shareholder value than current acquisition offers.

The board believes offering prices, some in excess of $7 billion, fall well below BlackBerry's potential asset value in the next few years, according to the Globe and Mail report. 

BlackBerry, a one-time investor darling that pioneered smartphones, has regained some of its lost appeal under chief executive John Chen, who is leading a bid to regain market share it has lost to Apple, Google and Samsung.

Any tie-up with Samsung would require the blessing of Prem Watsa, whose Fairfax Financial Holdings is a major Blackberry shareholder. Fairfax helped bankroll a debt recapitalisation that led to Chen's arrival in November 2013 as CEO. 

The bid would also face regulatory scrutiny in both Ottawa and Washington. Under Canadian law, any foreign takeover of BlackBerry would require government approval under the Industry Canada Act.

BlackBerry's secure networks manage the email traffic of thousands of large corporate customers, along with government and military agencies across the globe.