Stock-Based Compensation Plans (Tables)

12 Months Ended

Mar. 31, 2012

Weighted-Average Assumptions used to Determine Fair Value of Stock Acquisition Rights Granted

was 813 yen, 1,036 yen and 345 yen, respectively. The fair value of stock acquisition rights granted on the date of grant and used to recognize compensation expense for the fiscal years ended March 31, 2010, 2011 and 2012 was estimated using the Black-Scholes option-pricing model with the following weighted-average assumptions:

	Fiscal year ended March 31
	2010			2011			2012
Weighted-average assumptions
Risk-free interest rate		2.08	%		1.60	%		1.08	%
Expected lives		6.49	years		6.64	years		6.77	years
Expected volatility*		33.70	%		35.74	%		36.88	%
Expected dividends		0.99	%		0.83	%		1.85	%

* Expected volatility was based on the historical volatilities of Sony Corporation’s common stock over the expected life of the stock acquisition rights.

Stock Acquisition Rights Plan

Summary of Activities Regarding Equity-Based Compensation Plan

A summary of the activities regarding the stock acquisition rights plan during the fiscal year ended March 31, 2012 is as follows:

	Fiscal year ended March 31, 2012
	Number of shares		Weighted- average exercise price		Weighted- average remaining life		Total intrinsic value
			Yen		Years		Yen in millions
Outstanding at beginning of the fiscal year		17,011,400		3,458
Granted		2,537,500		1,520
Exercised		1,500		2,347
Forfeited or expired		667,100		3,326
Outstanding at end of the fiscal year		18,880,300		3,188		5.78		336
Exercisable at end of the fiscal year		13,952,100		3,548		4.64		—

Convertible Bonds Plan

Summary of Activities Regarding Equity-Based Compensation Plan

A summary of the activities regarding the convertible bond plan during the fiscal year ended March 31, 2012 is as follows:

	Fiscal year ended March 31, 2012
	Number of shares			Weighted-average exercise price
				Yen
Outstanding at beginning of the fiscal year		548,500			6,931
Expired		(548,500	)		6,931
Outstanding at end of the fiscal year		—