Sony Corp announced on Friday a share buyback of 100 billion yen ($910 million) - its first ever aimed at boosting shareholder returns - sending the Japanese electronics and entertainment company's shares up more than 5 percent.

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Sony said the buyback, to be conducted through March 22, would be equivalent to 2.36 percent of its outstanding stock.

"Our financial health has improved enough to conduct the repurchases," a Sony spokesman said, as the company reinvented itself as an entertainment company with stable revenue from music content and gaming, after battling years of losses with price-competitive consumer electronics.

The spokesman said Sony also took into account current share price levels.

Sony shares had plunged 14 percent this week after the company reported lower-than-expected profit as its previously thriving gaming business sagged, though a one-off gain related to its acquisition of EMI nevertheless pushed the quarterly result to a record high.

Sony's announcement comes a day after SoftBank Group Corp's shares jumped 17 percent after the Japanese tech investment giant unveiled a record share buyback.