Beginning in the fiscal quarter ended April 30, 2019, we implemented a new equity compensation program applicable to the vast majority of our employees but not applicable to our Chief Executive Officer (CEO). Prior to the adoption of the new equity compensation program, at the time of hire, our employees received a grant of RSUs that vested quarterly over four years and received additional equity from time to time thereafter. Under the new equity compensation program, the vast majority of our employees are granted both RSUs, which typically vest over a one-year period, and stock options, which typically vest over a four-year period.

In connection with our initial public offering in October 2013 (IPO), we amended our certificate of incorporation to provide for Class A common stock, Class B common stock and preferred stock. Immediately prior to the consummation of the IPO, all outstanding shares of convertible preferred stock and common stock were converted into shares of Class B common stock. As a result, following the IPO, we have two classes of authorized common stock: Class A common stock and Class B common stock.

Our board of directors adopted our 2007 Stock Plan (2007 Plan) in February 2007, and our stockholders approved it in February 2007. No further awards have been made under our 2007 Plan since the adoption of the 2012 Equity Incentive Plan. However, awards outstanding under our 2007 Plan will continue to be governed by their existing terms.

Our board of directors adopted our 2012 Equity Incentive Plan (2012 EIP) in November 2012, and our stockholders approved it in December 2012. An amendment and restatement of the 2012 EIP was approved by our board of directors in March 2013, and our stockholders approved it in March 2013. The 2012 EIP became effective on adoption and replaced our 2007 Plan. No further awards have been made under our 2012 EIP since the adoption of the 2013 Equity Incentive Plan. However, awards outstanding under the 2012 EIP will continue to be governed by their existing terms.

Our board of directors adopted our 2013 Equity Incentive Plan (2013 EIP) in August 2013, and our stockholders approved it in September 2013. The 2013 EIP became effective immediately on adoption although no awards were made under it until the date of our IPO on October 15, 2013, at which time our 2013 EIP replaced our 2012 EIP.

As of January 31, 2020, the number of shares of our Class A common stock available for issuance under the 2013 EIP was 28,471,030 plus any shares of our Class B common stock subject to awards under the 2012 EIP and the 2007 Plan that expire or lapse unexercised or, with respect to shares issued pursuant to such awards, are forfeited or repurchased by us after the date of our IPO on October 15, 2013. The number of shares available for issuance under the 2013 EIP automatically increases on the first business day of each of our fiscal years, commencing in 2014, by a number equal to the least of (a) 13.75 million shares, (b) 5% of the shares of all classes of our common stock outstanding on the last business day of the prior fiscal year, or (c) the number of shares determined by our board of directors. During our fiscal year ended January 31, 2020, our board of directors determined to add 6,578,553 shares of common stock to the 2013 EIP.

Our ESPP was adopted by our board of directors in August 2013 and our stockholders approved it in September 2013. The ESPP became effective as of our IPO registration statement on Form S-1, on October 15, 2013. Our ESPP is intended to qualify under Section 423 of the Internal Revenue Code of 1986, as amended (Code). The ESPP was approved with a reserve of 4.0 million shares of Class A common stock for future issuance under various terms provided for in the ESPP. As of January 31, 2020, the number of shares available for issuance under our ESPP was 4,897,856. The number of shares available for issuance under the ESPP automatically increases on the first business day of each of our fiscal years, commencing in 2014, by a number equal to the least of (a) 2.2 million shares, (b) 1% of the shares of all classes of our common stock outstanding on the last business day of the prior fiscal year or (c) the number of shares determined by our board of directors. Prior to the beginning of our fiscal year ended January 31, 2020, our board of directors determined not to increase the number of shares available for issuance under the ESPP.

During active offering periods, our ESPP permits eligible employees to acquire shares of our common stock at 85% of the lower of the fair market value of our Class A common stock on the first day of the applicable offering period or the fair market value of our Class A common stock on the purchase date. Participants may purchase shares of common stock through payroll deductions of up to 15% of their eligible compensation, subject to any plan limitations. The initial offering period for our ESPP commenced on the date of our initial public offering and ended on June 15, 2014. We have not had any open offering periods subsequent to the initial offering period.

The holders of our Class B common stock are entitled to ten votes per share, and holders of our Class A common stock are entitled to one vote per share. The holders of our Class A common stock and Class B common stock vote together as a single class, unless otherwise required by our restated certificate of incorporation or law. Delaware law could require either holders of our Class A common stock or our Class B common stock to vote separately as a single class in the following circumstances:

Stockholders do not have the ability to cumulate votes for the election of directors. Our restated certificate of incorporation and amended and restated bylaws that became effective upon the closing of our IPO provide for a classified board of directors consisting of three classes of approximately equal size, each serving staggered three-year terms. Only one class of directors will be elected at each annual meeting of our stockholders, with the other classes continuing for the remainder of their respective three-year terms.

Holders of outstanding shares of our common stock are entitled to receive dividends out of funds legally available if our board of directors, in its discretion, determines to issue dividends and only then at the times and in the amounts that our board of directors may determine. To date, no dividends have been declared or paid by us.

Upon our dissolution, liquidation or winding-up, the assets legally available for distribution to our stockholders are distributable ratably among the holders of our common stock, subject to prior satisfaction of all outstanding debt and liabilities and the preferential rights and payment of liquidation preferences, if any, on any outstanding shares of preferred stock.

Each outstanding share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock. In addition, each share of Class B common stock will convert automatically into one share of Class A common stock upon any transfer, whether or not for value, which occurs following the closing of our IPO, except for certain permitted transfers described in our restated certificate of incorporation, including transfers to any “permitted transferee” as defined in our restated certificate of incorporation, which includes, among others, transfers:

All the outstanding shares of Class A and Class B common stock will convert automatically into shares of a single class of common stock upon the earliest to occur of the following: (i) upon the election of the holders of a majority of the then-outstanding shares of Class B common stock or (ii) October 15, 2023. Following such conversion, each share of common stock will have one vote per share and the rights of the holders of all outstanding common stock will be identical. Once converted into a single class of common stock, the Class A and Class B common stock may not be reissued.

The 2007 Stock Plan and the 2012 EIP provided, and the 2013 EIP provides, for the issuance of incentive and nonstatutory options to employees, consultants and non-employee directors. Options issued under and outside of the 2007 Plan generally are exercisable for periods not to exceed 10 years and generally vest over four to five years. Options issued under the 2012 EIP and 2013 EIP generally are exercisable for periods not to exceed 10 years and generally vest over five to nine years. A summary of stock option activity for the fiscal year ended January 31, 2020 is presented below:



	Number of shares		Weighted average exercise price		Weighted average remaining contractual term (in years)	Aggregate intrinsic value
Options outstanding at January 31, 2019	12,961,397		$	19.43	5.4	$	1,161,695,032
Options granted	2,502,908		129.79
Options exercised	(1,665,778	)	6.54
Options forfeited/cancelled	(350,501	)	55.16
Options outstanding at January 31, 2020	13,448,026		$	40.64	5.4	$	1,426,502,005
Options vested and exercisable at January 31, 2020	6,697,955		$	6.19	3.2	$	940,544,986
Options vested and exercisable at January 31, 2020 and expected to vest thereafter	13,448,026		$	40.64	5.4	$	1,426,502,005

As of January 31, 2020, there was $194.5 million in unrecognized compensation cost related to unvested stock options granted under the 2007 Plan, 2012 EIP and 2013 EIP. This cost is expected to be recognized over a weighted average period of 3.9 years.

Our closing stock price as reported on the New York Stock Exchange as of January 31, 2020, the last trading day of fiscal year 2020 was $146.61. The total intrinsic value of options exercised was $229.0 million for the fiscal year ended January 31, 2020.



	Unreleased restricted stock units		Weighted average grant date fair value
Balance at January 31, 2019	2,359,132		$	54.73
RSUs granted	892,667		142.92
RSUs vested	(1,239,933	)	57.73
RSUs forfeited/cancelled	(193,244	)	61.28
Balance at January 31, 2020	1,818,622		$	95.23

As of January 31, 2020, there was a total of $157.4 million in unrecognized compensation cost related to unvested RSUs, which are expected to be recognized over a weighted-average period of approximately 2.8 years. The total intrinsic value of RSUs vested was $178.8 million for the fiscal year ended January 31, 2020.



	Fiscal year ended January 31,
	2020	2019	2018
Volatility	39% – 41%	41%	42% – 44%
Expected term (in years)	5.64 – 6.61	6.25 – 6.35	6.35
Risk-free interest rate	1.39% – 2.52%	2.57% – 2.74%	1.86% – 2.21%
Dividend yield	0%	0%	0%

During the fiscal year ended January 31, 2018, we granted 2,838,635 stock options to our CEO. The stock option award is made up of five separate tranches. The first tranche vests over time, while the remaining four tranches vest based on certain stock price targets (market conditions). The grant date fair values of each tranche were calculated using a Monte Carlo simulation model. We have based our expected term on the historical stock activity behavior of our CEO. The following table provides the assumptions used in the Monte Carlo simulation for each tranche granted: