The Cabot Corporation Amended and Restated 2017 Long-Term Incentive Plan (the “Amended Plan”) was established by the Company to provide stock-based compensation to eligible employees. The Amended Plan was approved by Cabot’s stockholders on March 11, 2021 and authorizes the issuance of up to 8,625,000 shares of common stock. It is the only equity incentive plan under which the Company may grant equity awards to employees.

The terms of awards made under Cabot’s equity compensation plans are generally determined by the Compensation Committee of Cabot’s Board of Directors. The awards made in fiscal 2021, 2020 and 2019 consist of grants of stock options, time-based restricted stock units, and performance-based restricted stock units. The options were issued with an exercise price equal to 100% of the market price of Cabot’s common stock on the date of grant, generally vest over a three year period (30% on each of the first and second anniversaries of the date of grant and 40% on the third anniversary of the date of grant) and have a ten-year term. The restricted stock units generally vest three years from the date of the grant. The number of shares issuable, if any, when a performance-based restricted stock unit award vests will depend on the degree of achievement of the corporate performance metrics for each year within the three-year performance period of the award. Accordingly, future compensation costs associated with outstanding awards of performance-based restricted stock units may increase or decrease based on the probability of the Company achieving the performance metrics.

Stock-based employee compensation expense was $20 million, $9 million and $8 million, after tax, for fiscal 2021, 2020 and 2019, respectively.

The following table presents stock-based compensation expenses included in the Company’s Consolidated Statements of Operations:

	Years Ended September 30
	2021			2020		2019
	(In millions)
Cost of sales	$	2		$	1	$	1
Selling and administrative expenses		17			7		9
Research and technical expenses		2			1		1
Stock-based compensation expense		21			9		11
Income tax benefit		(1	)		—		(3	)
Net stock-based compensation expense	$	20		$	9	$	8

As of September 30, 2021, Cabot had $21 million and $2 million of total unrecognized compensation cost related to restricted stock units and options, respectively, granted under the Company’s equity incentive plans. These costs are expected to be recognized over a weighted-average period of approximately one year for restricted stock units and options.

The following table summarizes the total stock option and restricted stock unit activity in the equity incentive plans for fiscal 2021:

	Stock Options					Restricted Stock Units
	Total Options ⁽⁴⁾			Weighted Average Exercise Price		Restricted Stock Units⁽¹⁾			Weighted Average Grant Date Fair Value
	(Shares in thousands)
Outstanding at September 30, 2020		1,273		$	50.45		604		$	52.87
Granted		394		$	40.97		369		$	41.92
Performance-based adjustment⁽²⁾		—		$	—		88		$	44.56
Exercised / Vested		(121	)	$	44.60		(184	)	$	60.11
Cancelled / Forfeited		(70	)	$	50.96		(18	)	$	49.98
Outstanding at September 30, 2021⁽³⁾		1,476		$	48.36		859		$	45.82
Exercisable at September 30, 2021		731		$	51.55

As of September 30, 2021, the aggregate intrinsic value for all options outstanding and options exercisable was $5 million. The intrinsic value of options exercised during fiscal 2021, 2020 and 2019 was $2 million, nominal and $1 million, respectively, and the Company received cash of $5 million, $1 million and $2 million, respectively, from these exercises. The Company recognized immaterial tax benefits in fiscal 2021, 2020, and 2019 from the exercise of stock options which were included in (Provision) benefit for income taxes within the Consolidated Statements of Operations.

The Company uses the Black-Scholes option-pricing model to estimate the fair value of the options at the grant date. The weighted average grant date fair values of options granted during fiscal 2021, 2020 and 2019 was $9.69, $10.68, and $10.85 per option, respectively. The fair values on the grant date were calculated using the following weighted-average assumptions:

	Years Ended September 30
	2021			2020			2019
Expected stock price volatility		36	%		28	%		27	%
Risk free interest rate		0.6	%		1.9	%		3.1	%
Expected life of options (years)		6			6			6
Expected annual dividends per year	$	1.40		$	1.40		$	1.32

The expected stock price volatility assumption was determined using the historical volatility of the Company’s common stock over the expected life of the option. The expected term reflects the anticipated time period between the measurement date and the exercise date or post-vesting cancellation date.

The value of restricted stock unit awards is the closing stock price at the date of the grant. The weighted average grant date fair values of restricted stock unit awards granted during fiscal 2021, 2020 and 2019 was $41.92, $49.36, and $49.44, respectively. The intrinsic value of restricted stock units (meaning the fair value of the units on the date of vesting) that vested during fiscal 2021, 2020 and 2019 was $8 million, $13 million and $18 million, respectively.

Cabot’s Deferred Compensation and Supplemental Retirement Plan (“SERP 401(k)”) provides benefits to highly compensated employees when the retirement plan limits established under the Internal Revenue Code prevent them from receiving all of the Company matching and retirement contributions that would otherwise be provided under the qualified 401(k) plan. The SERP 401(k) is non-qualified and unfunded. Contributions under the SERP 401(k) are treated as if invested in Cabot common stock. The majority of the distributions made under the SERP 401(k) are required to be paid with shares of Cabot common stock. The remaining distributions, which relate to certain grandfathered accounts, will be paid in cash based on the market price of Cabot common stock at the time of distribution. The aggregate value of the accounts that will be paid out in stock, which is equivalent to approximately 77,000 and 76,000 shares of Cabot common stock as of September 30, 2021 and 2020, respectively, is reflected at historic cost in stockholders’ equity, and the aggregate value of the accounts that will be paid in cash, which was immaterial as of September 30, 2021 and 2020, was included in Other liabilities and marked-to-market quarterly.