STOCK-BASED COMPENSATION

Stock Options

The assumptions used in our Black-Scholes valuation related to grants made during the three months ended September 30, 2013 and 2012 were as follows:



	2013		2012
Risk-free interest rate	1.3	%	0.6	%
Expected life (years) ⁽¹⁾	4.5		4.5
Expected volatility ⁽²⁾	40.4	%	49.5	%
Expected dividend yield	1.5	%	1.3	%

(1) Expected life is derived from historical experience.

(2) Expected volatility is based on the implied historical volatility of our stock.

Changes in our stock options for the three months ended September 30, 2013 were as follows:



	Options		Weighted Average Exercise Price		Weighted Average Remaining Life (years)	Aggregate Intrinsic value (in thousands)
Options outstanding, June 30, 2013	2,729,068		$	30.40
Granted	342,662		45.24
Exercised	(338,072	)	25.85
Lapsed and forfeited	—		—
Options outstanding, September 30, 2013	2,733,658		$	32.83	6.1	$	34,918
Options vested and expected to vest, September 30, 2013	2,682,865		$	32.68	6.0	$	34,681
Options exercisable, September 30, 2013	1,860,371		$	29.76	4.8	$	29,466

During the three months ended September 30, 2013 and 2012, compensation expense related to stock options was $3.0 million and $2.8 million, respectively. As of September 30, 2013, the total unrecognized compensation cost related to options outstanding was $4.6 million and is expected to be recognized over a weighted average period of 2.9 years.

Weighted average fair value of options granted during the three months ended September 30, 2013 and 2012 was $13.79 and $13.52, respectively. Fair value of options vested during the three months ended September 30, 2013 and 2012 was $4.5 million and $4.5 million, respectively.

Tax benefits, relating to excess stock-based compensation deductions, are presented in the condensed consolidated statements of cash flow as financing cash inflows. Tax benefits resulting from stock-based compensation deductions exceeded amounts reported for financial reporting purposes by $3.4 million and $0.7 million for the three months ended September 30, 2013 and 2012, respectively.

The amount of cash received from the exercise of capital stock options during the three months ended September 30, 2013 and 2012 was $8.7 million and $1.7 million, respectively. The related tax benefit for the three months ended September 30, 2013 and 2012 was $1.8 million and $0.3 million, respectively. The total intrinsic value of options exercised during the three months ended September 30, 2013 and 2012 was $6.3 million and $1.1 million, respectively.

Under the provisions of the Kennametal Inc. Stock and Incentive Plan of 2010, Plan participants may deliver stock, owned by the holder for at least six months, in payment of the option price and receive credit for the fair market value of the shares on the date of delivery. The fair market value of shares delivered during both the three months ended September 30, 2013 and 2012 were immaterial.

Restricted Stock Units – Time Vesting and Performance Vesting

Performance vesting restricted stock units are earned pro rata each year if certain performance goals are met over a three-year period, and are also subject to a service condition that requires the individual to be employed by the Company at the payment date after the three-year performance period, with the exception of retirement eligible grantees, who upon retirement are entitled to receive payment for any units that have been earned, including a prorated portion in the partially completed fiscal year in which the retirement occurs.

Changes in our time vesting and performance vesting restricted stock units for the three months ended September 30, 2013 were as follows:



	Performance Vesting Stock Units		Performance Vesting Weighted Average Fair Value		Time Vesting Stock Units		Time Vesting Weighted Average Fair Value
Unvested performance vesting and time vesting restricted stock units, June 30, 2013	367,612		$	32.08	815,210		$	34.53
Granted	82,449		45.24		298,345		45.13
Vested	(156,798	)	26.89		(285,562	)	32.22
Performance metric not achieved	(95,907	)	45.24		—		—
Forfeited	—		—		(17,999	)	38.83
Unvested performance vesting and time vesting restricted stock units, September 30, 2013	197,356		$	40.92	809,994		$	39.15

During the three months ended September 30, 2013 and 2012, compensation expense related to time vesting and performance vesting restricted stock units was $5.7 million and $7.1 million, respectively. As of September 30, 2013, the total unrecognized compensation cost related to unvested time vesting and performance vesting restricted stock units was $23.0 million and is expected to be recognized over a weighted average period of 2.8 years.