We have issued performance-based stock options and performance-based RSUs, the vesting of which is generally contingent upon the achievement of certain performance criteria related to our operating performance, as well as successful and timely development and market acceptance of future product introductions. In addition, certain of the performance RSUs have additional service requirements subsequent to the achievement of the performance criteria. Compensation expense is recognized over the requisite service period, which is defined as the longest explicit, implicit or derived service period based on management’s estimate of the probability of the performance criteria being satisfied, adjusted at each balance sheet date. For both service-based and performance-based RSUs, we account for forfeitures as they occur as a reduction to stock-based compensation expense and additional paid-in-capital.

For performance-based options with a vesting schedule based entirely on the attainment of both performance and market conditions, stock-based compensation expense is recognized for each pair of performance and market conditions over the longer of the expected achievement period of the performance and market conditions, beginning at the point in

time that the relevant performance condition is considered probable of achievement. The fair value of such awards is estimated on the grant date using Monte Carlo simulations.

On May 24, 2018, our stockholders approved the Board of Directors’ grant of 6,365,856 stock option awards to Patrick W. Smith, our CEO (the “CEO Performance Award”). The CEO Performance Award consists of 12 vesting tranches with a vesting schedule based entirely on the attainment of both operational goals (performance conditions) and market capitalization goals (market conditions), assuming continued employment either as the CEO or as both Executive Chairman and Chief Product Officer and service through each attainment date. Each of the 12 vesting tranches of the CEO Performance Award have a 10-year contractual term and will vest upon certification by the Compensation Committee of the Board of Directors that both (i) the market capitalization goal for such tranche, which begins at $2.5 billion for the first tranche and increases by increments of $1.0 billion thereafter, and (ii) any one of the following eight operational goals focused on revenue or eight operational goals focused on Adjusted EBITDA have been met for the previous four consecutive fiscal quarters. Adjusted EBITDA for purposes of the CEO Performance Award ("Adjusted EBITDA (CEO Performance Award)") is defined as net income (loss) attributable to common stockholders before interest expense, interest and other income (such as dividends) earned on investments in marketable securities, provision (benefit) for income taxes, depreciation and amortization, and stock-based compensation expense.

(1)	In connection with the business acquisition that was completed during the three months ended September 30, 2018, the revenue goals were adjusted for the acquiree’s Target Revenue, as defined in the CEO Performance Award agreement.

Stock-based compensation expense associated with the CEO Performance Award is recognized over the longer of the expected achievement period for each pair of market capitalization and operational goals, beginning at the point in time when the relevant operational goal is considered probable of being met. The probability of meeting an operational goal and the expected achievement point in time for meeting a probable operational goal are based on a subjective assessment of our forward-looking financial projections, taking into consideration statistical analysis. Even though no tranches of the CEO Performance Award vest unless a market capitalization and a matching operational goal are both achieved, stock-based compensation expense is recognized when an operational goal is considered probable of achievement regardless of whether a market capitalization goal is actually achieved. Stock-based compensation represents a non-cash expense and is recorded in sales, general, and administrative operating expense on our consolidated statements of operations and comprehensive income.

The first ten market capitalization goals have been achieved as of March 31, 2022. As of March 31, 2022, 5.3 million stock options have been certified by the Compensation Committee and vested. As twelve operational goals have been achieved or are considered probable of achievement, we recorded stock-based compensation expense of $233.1 million related to the CEO Performance Award from the grant date through March 31, 2022. The number of stock options that would vest related to the remaining unvested tranches is approximately 1.1 million shares. As of March 31,

2022, we had $12.8 million of total unrecognized stock-based compensation expense for the performance goals that were considered probable of achievement, which will be recognized over a weighted-average period of 1.3 years.

eXponential Stock Performance Plan

On February 12, 2019, our shareholders approved the 2019 Stock Incentive Plan (the “2019 Plan”), which was adopted by the Board of Directors to reserve a sufficient number of shares to facilitate our eXponential Stock Performance Plan (“XSPP”) and grants of eXponential Stock Units (“XSUs”) under the plan. Initial awards under the plan were granted in January 2019, with additional employee awards granted since that date.

The XSUs are grants of Restricted Stock Units (“RSUs”), each with a term of approximately nine years, that vest in 12 equal tranches. Each of the 12 tranches will vest upon certification by the Compensation Committee of the Board of Directors that both (i) the market capitalization goal for such tranche, which begins at $2.5 billion for the first tranche and increases by increments of $1.0 billion thereafter, and (ii) any one of eight operational goals focused on revenue or eight operational goals focused on Adjusted EBITDA (CEO Performance Award) have been met for the previous four consecutive fiscal quarters. Beginning with the quarter ended June 30, 2021, new XSU grants are divided into a reduced number of tranches depending on employee eligibility and current market capitalization attainment.

The XSPP contains an anti-dilution provision incorporated into the plan based on shareholder feedback, which affects the calculation of the market capitalization goals in the plan. The plan defines a maximum number of shares outstanding that may be used in the calculation of the market capitalization goals (the “XSU Maximum”). If the actual number of shares outstanding exceeds the XSU Maximum guardrail, then the lower pre-defined number of shares in the XSU Maximum, rather than the higher actual number of shares outstanding, is used to calculate market capitalization for the determination of the market capitalization goals in the XSPP, which, together with the operational goals, determines whether XSUs vest for participating employees.

The XSU Maximum is defined as the actual number of shares outstanding on the original XSU grant date of January 2, 2019, increased by a 3% annual rate over the term of the XSPP and by shares issued upon the exercise of CEO Performance Award options. The XSU Maximum is also adjusted for acquisitions, spin-offs or other changes in the number of outstanding shares of common stock, if such changes have a corresponding adjustment on the market capitalization goals.

New shares issued for any other reasons, including shares issued upon vesting of XSUs, RSUs, and Performance Stock Units (“PSUs”) as well as shares issued to raise capital through equity issuances or in other transactions, do not increase the XSU Maximum.

The market capitalization and operational goals are identical to the CEO Performance Award, but a different number of shares is used to calculate the market capitalization goals if shares outstanding exceed the XSU Maximum. Additionally, because the grant date is different than that of the CEO Performance Award, the measurement period for market capitalization is not identical. As of March 31, 2022, actual shares outstanding exceeded the XSU Maximum. Accordingly, market capitalization as calculated for the purposes of achieving additional goals uses the lower XSU Maximum share amount rather than actual shares outstanding.

The first nine market capitalization goals have been achieved as of March 31, 2022. The tenth market capitalization goal has not yet been attained, though the related operational goal was achieved as of September 30, 2021. As all twelve operational goals have been achieved or are considered probable of achievement, we recorded stock-based compensation expense of $180.4 million related to the XSU awards from their respective grant dates through March 31, 2022. The number of XSU awards that would vest related to the remaining three tranches is approximately 1.3 million shares. As of March 31, 2022, we had $18.4 million of total unrecognized stock-based compensation expense, which will be recognized over a weighted-average period of 1.8 years.

Restricted Stock Units

The following table summarizes RSU activity for the three months ended March 31, 2022 (number of units and aggregate intrinsic value in thousands):


	Number of	Weighted Average		Aggregate
	Units	Grant-Date Fair Value		Intrinsic Value
Units outstanding, beginning of year	1,115	$	133.40
Granted	149		137.89
Released	(93)		76.70
Forfeited	(25)		136.92
Units outstanding, end of period	1,146		138.48	$	157,892

Aggregate intrinsic value represents our closing stock price on the last trading day of the period, which was $137.73 per share, multiplied by the number of RSUs outstanding. As of March 31, 2022, there was $126.6 million in unrecognized compensation costs related to RSUs under our stock plans for shares that are expected to vest. We expect to recognize the cost related to the RSUs over a weighted average period of 2.2 years. RSUs are released when vesting requirements are met.

Certain RSUs that vested in the three months ended March 31, 2022 were net-share settled such that we withheld shares to cover the employees’ tax obligation for the applicable income and other employment taxes, and remitted the cash to the appropriate taxing authorities. Total shares withheld related to RSUs were four thousand and had a value of $0.5 million on their respective vesting dates as determined by the closing stock price on such dates. Payments for the employees’ tax obligations are reflected as a financing activity within the condensed consolidated statements of cash flows. We record a liability for the tax withholding to be paid by us as a reduction to additional paid-in capital.

Performance Stock Units

The following table summarizes PSU activity, inclusive of XSUs, for the three months ended March 31, 2022 (number of units and aggregate intrinsic value in thousands):


	Number of	Weighted Average		Aggregate
	Units	Grant-Date Fair Value		Intrinsic Value
Units outstanding, beginning of year	1,499	$	39.86
Granted	46		130.33
Released	(18)		128.52
Forfeited	(10)		53.93
Units outstanding, end of period	1,517		41.48	$	208,987

Aggregate intrinsic value represents our closing stock price on the last trading day of the period, which was $137.73 per share, multiplied by the number of PSUs outstanding. As of March 31, 2022, there was $27.2 million in unrecognized compensation costs related to PSUs under our stock plans for shares that are expected to vest. We expect to recognize the cost related to the PSUs over a weighted average period of 1.8 years. PSUs are released when vesting requirements are met.

As of March 31, 2022, the performance criteria had been met for approximately seventeen thousand of the 1.5 million PSUs outstanding.

Certain PSUs that vested in the three months ended March 31, 2022 were net-share settled such that we withheld shares to cover the employees’ tax obligation for the applicable income and other employment taxes, and remitted the cash to the appropriate taxing authorities. Total shares withheld related to PSUs were approximately six thousand and had a

value of $0.8 million on their respective vesting dates as determined by the closing stock price on such dates. Payments for the employees’ tax obligations are reflected as a financing activity within the condensed consolidated statements of cash flows. We record a liability for the tax withholding to be paid by us as a reduction to additional paid-in capital.

Stock Option Activity

The following table summarizes stock option activity for the three months ended March 31, 2022 (number of units and aggregate intrinsic value in thousands):


				Weighted
		Weighted		Average
	Number	Average		Remaining
	of	Exercise		Contractual	Aggregate
	Options	Price		Life (years)	Intrinsic Value
Options outstanding, beginning of year	2,438	$	28.58
Granted	—		—
Exercised	—		—
Expired / terminated	—		—
Options outstanding, end of period	2,438		28.58	5.91	$	266,103
Options exercisable, end of period	1,377		28.58	5.91		150,297

Aggregate intrinsic value represents the difference between the exercise price of the underlying stock option awards and the closing market price of our common stock of $137.73 on March 31, 2022. There were no options exercised for the three months ended March 31, 2022. As of March 31, 2022, total options outstanding included 1.1 million unvested performance-based stock options, which relate to the CEO Performance Award and are probable of achievement.

Stock-based Compensation Expense

The following table summarizes the composition of stock-based compensation expense for the three months ended March 31, 2022 and 2021 (in thousands):


	Three Months Ended March 31,
	2022		2021
Cost of products sold and services delivered	$	1,108	$	1,489
Sales, general and administrative expenses		10,998		71,015
Research and development expenses		12,982		17,106
Total stock-based compensation expense	$	25,088	$	89,610

Stock Incentive Plan

In February 2019, our shareholders approved the 2019 Plan authorizing an additional 6.0 million shares, plus remaining available shares under prior plans, for issuance under the new plan. Combined with the legacy stock incentive plans, there are 0.9 million shares available for grant as of March 31, 2022.

Stock Inducement Plan

In September 2019, our Board of Directors adopted the Axon Enterprise, Inc. 2019 Stock Inducement Plan (the “2019 Inducement Plan”) pursuant to which we reserved 500,000 shares of common stock for issuance under the Inducement Plan. In accordance with Rule 5635(c)(4) and Rule 5635(c)(3) of the Nasdaq Listing Rules, awards under the Inducement Plan may only be made to individuals not previously employed by us (or following such individuals’ bona fide periods of non-employment by us), as an inducement material to the individuals’ entry into employment with us. The terms and conditions of the 2019 Inducement Plan are substantially similar to our stockholder-approved 2019 Plan. As of March 31, 2022, there were 29,600 shares available for grant under the 2019 Inducement Plan. On April 6, 2022, we

granted 29,507 shares from the 2019 Inducement Plan to new employees who joined the Company as a result of an acquisition.

Stock Repurchase Plan

In February 2016, our Board of Directors authorized a stock repurchase program to acquire up to $50.0 million of our outstanding common stock subject to stock market conditions and corporate considerations. During the three months ended March 31, 2022 and 2021, no common shares were purchased under the program. As of March 31, 2022, $16.3 million remains available under the plan for future purchases. Any future purchases will be discretionary.

At-the-Market equity offering

During the year ended December 31, 2021, we sold 577,956 shares of our common stock under our "at-the-market" equity offering program (the “ATM”). We generated approximately $107.6 million in aggregate gross proceeds from sales under the ATM. Aggregate net proceeds from the ATM were $105.4 million after deducting related expenses, including commissions to the sales agent of $1.6 million and issuance costs of $0.5 million.

We may sell up to a total of 3.0 million shares of our common stock under the ATM. The ATM expires on April 20, 2024. We intend to use the net proceeds from this offering for general corporate purposes, which may include, among other things, providing capital to satisfy a portion of the tax obligations related to the vesting and settlement of stock compensation awards granted to our executive officers and other employees under our stock incentive plans, to support our growth, and to acquire or invest in product lines, products, services, technologies or facilities.