The record date for the annual meeting is May 1, 2020.March 22, 2021. Only stockholders of record at the close of business on that date may vote at the annual meeting or any adjournment or postponement thereof. To participate in and vote at the annual meeting, stockholders will need the unique16-digit control number (printed in the box marked by the arrow) in their Notice of Internet Availability of Proxy Materials or proxy card (if you requested a printed copy of the proxy materials).

Table of Contents

We provide Internet proxy voting to allow you to vote your shares online, with procedures designed to ensure the authenticity and correctness of your proxy vote instructions. However, please be aware that you must bear any costs associated with your internet access, such as usage charges from internet access providers and telephone companies.

What does it mean if I receive more than one Notice?

If you receive more than one Notice, your shares may be registered in more than one name or in different accounts. Please follow the voting instructions on each Notice to ensure that all of your shares are voted.

How can I find out the results of the voting at the annual meeting?

Preliminary voting results will be announced at the annual meeting. In addition, final voting results will be published in a current report on Form8-K that we expect to file within four business days after the annual meeting. If final voting results are not available to us in time to file a Form8-K within four business days after the meeting, we intend to file a Form 8-K to publish preliminary results and, within four business days after the final results are known to us, file an additional Form8-K to publish the final results.

Vote Required

Directors are elected by a plurality of the votes of the holders of shares deemed present in person or represented by proxy and entitled to vote on the election of directors. Accordingly, if a quorum is present, the seven nominees receiving the highest number of “For” votes will be elected. Shares represented by executed proxies will be voted, if authority to do so is not withheld, for the election of the seven nominees named above.

The board recommends that you vote “FOR” the election of each named nominee.

2017 - 2019 Burn Rate and 2019 Outstanding Awards Overhang

The following table provides certain additional information regarding our equity incentive program and our equity burn rate over the last three fiscal years and current overhang. Note that burn rate and overhang are calculated ona non-diluted basis.

Description of the 2020 Plan

The material features of the 2020 Plan are described below. The following description of the 2020 Plan is a summary only and is qualified in its entirety by reference to the complete text of the 2020 Plan. Stockholders are urged to read the actual text of the 2020 Plan in its entirety, which is attached to this proxy statement asAppendix A.

Purpose

The 2020 Plan is designed to secure and retain the services of ouremployees, non-employee directors and consultants, to provide incentives for such persons to exert maximum efforts for the success of the Company and

our affiliates, and to provide a means by which such persons may be given an opportunity to benefit from increases in the value of our common stock. The 2020 Plan is also designed to align employees’ interests with stockholder interests.

Continuation of and Successor to 2012 Plan

The 2020 Plan is intended to be the continuation of and successor to the 2012 Plan. If the 2020 Plan is approved by our stockholders, no additional awards will be granted under the 2012 Plan upon and following the date of the annual meeting. If the 2020 Plan is not approved by our stockholders, the 2020 Plan will not become effective and the 2012 Plan will continue to be effective in accordance with its terms.

Types of Awards

The terms of the 2020 Plan provide for the grant of incentive stock options, nonstatutory stock options, stock appreciation rights, restricted stock awards, restricted stock unit awards, and performance awards.

Shares Available for Awards

Subject to adjustment for certain changes in our capitalization, the aggregate number of shares of our common stock that may be issued under the 2020 Plan will not exceed (i) 22,066,275 shares (which includes 21,0000,000 new shares and the number of shares remaining available for the grant of new awards under the 2012 Plan as of March 31, 2020)less (A) one share of common stock for every one share that was subject to an Appreciation Award granted under the 2012 Plan after March 31, 2020, and prior to the effective date of the 2020 Plan and (B) 1.5 shares of common stock for every one share that was subject to a Full Value Award granted under the 2012 Plan after March 31, 2020, and prior to the effective date of the 2020 Plan,plus (ii) the 2012 Plan’s Returning Shares (as defined below), as such shares become available from time to time.

The “2012 Plan’s Returning Shares” are shares of our common stock subject to outstanding awards granted under the 2012 Plan that following March 31, 2020: (i) are not issued because such award or any portion thereof expires or otherwise terminates without all of the shares covered by such award having been issued; (ii) are not issued because such award or any portion thereof is settled in cash; (iii) are forfeited back to or repurchased by us because of the failure to meet a contingency or condition required for the vesting of such shares; (iv) are withheld or reacquired to satisfy the exercise, strike or purchase price of a Full Value Award; or (v) are withheld or reacquired to satisfy a tax withholding obligation in connection with a Full Value Award.

The number of shares of our common stock available for issuance under the 2020 Plan will be reduced or increased by (i) one share for each share of common stock issued pursuant to an Appreciation Award, and (ii) 1.5 shares for each share of common stock issued pursuant to a Full Value Award.

The following actions will not result in an issuance of shares of our common stock under the 2020 Plan and accordingly will not reduce the number of shares of our common stock available for issuance under the 2020 Plan: (i) the expiration or termination of any portion of an award granted under the 2020 Plan without the shares covered by such portion of the award having been issued; (ii) the settlement of any portion of an award granted under the 2020 Plan in cash; (iii) the withholding of shares that would otherwise be issued by the Company to satisfy the exercise, strike or purchase price of a Full Value Award; and (iv) the withholding of shares that would otherwise be issued by the Company to satisfy a tax withholding obligation in connection with a Full Value Award.

If any shares of our common stock issued pursuant to an award granted under the 2020 Plan are (i) forfeited back to or redeemed or repurchased by us because of the failure to meet a contingency or condition required for the vesting of such shares; (ii) reacquired by the Company to satisfy the exercise, strike or purchase price of a Full Value Award; or (iii) reacquired by the Company to satisfy a tax withholding obligation in connection with a Full Value Award, then such shares will become available again for issuance under the 2020 Plan.

The following shares of our common stock will not become available again for issuance under the 2020 Plan: (i) any shares that are reacquired or withheld (or not issued) by us to satisfy the exercise or strike price of an Appreciation Award granted under the 2020 Plan or the 2012 Plan (including any shares subject to such Appreciation Award that are not delivered because such award is exercised through a reduction of shares subject to such award); (ii) any shares that are reacquired or withheld (or not issued) by us to satisfy a tax withholding obligation in connection with an Appreciation Award granted under the 2020 Plan or the 2012 Plan; (iii) any shares repurchased by us on the open market with the proceeds of the exercise or strike price of an Appreciation Award granted under the 2020 Plan or the 2012 Plan; and (iv) in the event that a stock appreciation right granted under the 2020 Plan or the 2012 Plan is settled in shares, the gross number of shares subject to such award.

Eligibility

All of our (including our affiliates’) employees,non-employee directors and consultants are eligible to participate in the 2020 Plan and may receive all types of awards other than incentive stock options. Incentive stock options may be granted under the 2020 Plan only to our (including our affiliates’) employees. As of May 1, 2020, we (including our affiliates) had approximately 83 employees, sixnon-employee directors and approximately six consultants.

Administration

The 2020 Plan will be administered by our board of directors, which may in turn delegate some or all of the administration of the 2020 Plan to a committee or committees composed of members of the board of directors. Our board of directors has delegated concurrent authority to administer the 2020 Plan to our compensation committee, but may, at any time, revest in itself some or all of the power delegated to our compensation committee. Our board of directors and compensation committee are each considered to be a Plan Administrator for purposes of this Proposal 4.

Subject to the terms of the 2020 Plan, the Plan Administrator may determine the recipients, the types of awards to be granted, the number of shares of our common stock subject to or the cash value of awards, and the terms and conditions of awards granted under the 2020 Plan, including the period of their exercisability and vesting. The Plan Administrator has the authority to provide for accelerated exercisability and vesting of awards. Subject to the limitations set forth below, the Plan Administrator also determines the fair market value applicable to an award and the exercise or strike price of stock options and stock appreciation rights granted under the 2020 Plan.

In addition, the Plan Administrator may delegate to one or more executive officers the authority to designate employees who are not executive officers to be recipients of certain awards and the number of shares of our common stock subject to such awards. Under any such delegation, the Plan Administrator will specify the total number of shares of our common stock that may be subject to the awards granted by such executive officer. The executive officer may not grant an award to himself or herself.

Repricing; Cancellationand Re-Grant of Stock Options or Stock Appreciation Rights

Under the 2020 Plan, unless our stockholders have approved such an action within 12 months prior to such an event, the Plan Administrator does not have the authority to reprice any outstanding stock option or stock appreciation right by (1) reducing the exercise or strike price of the stock option or stock appreciation right, (2) canceling any outstanding stock option or stock appreciation right that has an exercise or strike price greater than the then-current fair market value of our common stock in exchange for cash or other awards (other than in connection with a Transaction, as defined in the 2020 Plan and described below), or (3) take any other action with respect to an outstanding stock option or stock appreciation right that would be treated as a repricing under the rules and regulations of the principal U.S. national securities exchange on which the Common Stock is listed, in each case .

Dividends and Dividend Equivalents

The 2020 Plan provides that dividends or dividend equivalents may be paid or credited with respect to any shares of our common stock subject to an award other than an option or stock appreciation right, as determined by the Plan Administrator and contained in the applicable award agreement; provided, however, that (i) no dividends or dividend equivalents may be paid with respect to any such shares before the date such shares have vested, (ii) any dividends or dividend equivalents that are credited with respect to any such shares will be subject to all of the terms and conditions applicable to such shares under the terms of the applicable award agreement (including any vesting conditions), and (iii) any dividends or dividend equivalents that are credited with respect to any such shares will be forfeited to us on the date such shares are forfeited to or repurchased by us due to a failure to vest.

Stock Options

Stock options may be granted under the 2020 Plan pursuant to stock option agreements. The 2020 Plan permits the grant of stock options that are intended to qualify as incentive stock options, or ISOs, and nonstatutory stock options, or NSOs.

The exercise price of a stock option granted under the 2020 Plan may not be less than 100% of the fair market value of the common stock subject to the stock option on the date of grant and, in some cases (see “—Limitations on Incentive Stock Options” below), may not be less than 110% of such fair market value.

The term of stock options granted under the 2020 Plan may not exceed ten years from the date of grant and, in some cases (see “—Limitations on Incentive Stock Options” below), may not exceed five years from the date of grant. Except as otherwise provided in a participant’s stock option agreement or other written agreement with us or one of our affiliates, if a participant’s service relationship with us or any of our affiliates (referred to in this Proposal 4 as “continuous service”) terminates (other than for cause (as defined in the 2020 Plan) or the participant’s death or disability (as defined in the 2020 Plan)), the participant may exercise any vested stock options for up to three months following the participant’s termination of continuous service. Except as otherwise provided in a participant’s stock option agreement or other written agreement with us or one of our affiliates, if a participant’s continuous service terminates due to the participant’s disability, the participant may exercise any vested stock options for up to 12 months following the participant’s termination due to the participant’s disability. Except as otherwise provided in a participant’s stock option agreement or other written agreement with us or one of our affiliates, if a participant’s continuous service terminates due to the participant’s death (or the participant dies within a specified period following termination of continuous service), the participant’s beneficiary may exercise any vested stock options for up to 18 months following the participant’s death. Except as explicitly provided otherwise in a participant’s stock option agreement or other written agreement with us or one of our affiliates, if a participant’s continuous service is terminated for cause, all stock options held by the participant will terminate upon the participant’s termination of continuous service and the participant will be prohibited from exercising any stock option from and after such termination date. Except as otherwise provided in a participant’s stock option agreement or other written agreement with us or one of our affiliates, the term of a stock option may be extended if a participant’s continuous service terminates for any reason other than for cause and, at any time during the applicable post-termination exercise period, the exercise of the stock option would be prohibited by applicable laws or the sale of any common stock received upon such exercise would violate our insider trading policy. In no event, however, may a stock option be exercised after its original expiration date.

Acceptable forms of consideration for the purchase of our common stock pursuant to the exercise of a stock option under the 2020 Plan will be determined by the Plan Administrator and may include payment: (i) by cash, check, bank draft or money order payable to us; (ii) pursuant to a program developed under Regulation T as promulgated by the Federal Reserve Board; (iii) by delivery to us of shares of our common stock (either by actual delivery or attestation); (iv) by a net exercise arrangement (for NSOs only); or (v) in other legal consideration approved by the Plan Administrator.

Stock options granted under the 2020 Plan may become exercisable in cumulative increments, or “vest,” as determined by the Plan Administrator at the rate specified in the stock option agreement. Shares covered by different stock options granted under the 2020 Plan may be subject to different vesting schedules as the Plan Administrator may determine.

The Plan Administrator may impose limitations on the transferability of stock options granted under the 2020 Plan in its discretion. Generally, a participant may not transfer a stock option granted under the 2020 Plan other than by will or the laws of descent and distribution or, subject to approval by the Plan Administrator, pursuant to a domestic relations order. However, the Plan Administrator may permit transfer of a stock option in a manner that is not prohibited by applicable tax and securities laws. Options may not be transferred to a third party financial institution for value.

Limitations on Incentive Stock Options

In accordance with current federal tax laws, the aggregate fair market value, determined at the time of grant, of shares of our common stock with respect to ISOs that are exercisable for the first time by a participant during any calendar year under all of our stock plans may not exceed $100,000. The stock options or portions of stock options that exceed this limit or otherwise fail to qualify as ISOs are treated as NSOs. No ISO may be granted to any person who, at the time of grant, owns or is deemed to own stock possessing more than 10% of our total combined voting power unless the following conditions are satisfied:

Subject to adjustment for certain changes in our capitalization, the aggregate maximum number of shares of our common stock that may be issued pursuant to the exercise of ISOs under the 2020 Plan is 30,238,690 shares.

Stock Appreciation Rights

Stock appreciation rights may be granted under the 2020 Plan pursuant to stock appreciation right agreements. Each stock appreciation right is denominated in common stock share equivalents. The strike price of each stock appreciation right will be determined by the Plan Administrator, but will in no event be less than 100% of the fair market value of the common stock subject to the stock appreciation right on the date of grant. The term of stock appreciation rights granted under the 2020 Plan may not exceed ten years from the date of grant. The Plan Administrator may also impose restrictions or conditions upon the vesting of stock appreciation rights that it deems appropriate. The appreciation distribution payable upon exercise of a stock appreciation right may be paid in shares of our common stock, in cash, in a combination of cash and stock, or in any other form of consideration determined by the Plan Administrator and set forth in the stock appreciation right agreement. Stock appreciation rights will be subject to the same conditions upon termination of continuous service and restrictions on transfer as stock options under the 2020 Plan.

Restricted Stock Awards

Restricted stock awards may be granted under the 2020 Plan pursuant to restricted stock award agreements. A restricted stock award may be granted in consideration for cash, check, bank draft or money order payable to us, the participant’s services performed for us, or any other form of legal consideration acceptable to the Plan Administrator. Shares of our common stock acquired under a restricted stock award may be subject to forfeiture to or repurchase by us in accordance with a vesting schedule to be determined by the Plan Administrator. Rights to acquire shares of our common stock under a restricted stock award may be transferred only upon such terms and conditions as are set forth in the restricted stock award agreement. Upon a participant’s termination of continuous service for any reason, any shares subject to restricted stock awards held by the participant that have not vested as of such termination date may be forfeited to or repurchased by us.

Restricted Stock Unit Awards

Restricted stock unit awards may be granted under the 2020 Plan pursuant to restricted stock unit award agreements. Payment of any purchase price may be made in any form of legal consideration acceptable to the Plan Administrator. A restricted stock unit award may be settled by the delivery of shares of our common stock, in cash, in a combination of cash and stock, or in any other form of consideration determined by the Plan Administrator and set forth in the restricted stock unit award agreement. Restricted stock unit awards may be subject to vesting in accordance with a vesting schedule to be determined by the Plan Administrator. Except as otherwise provided in a participant’s restricted stock unit award agreement or other written agreement with us, restricted stock units that have not vested will be forfeited upon the participant’s termination of continuous service for any reason.

Performance Awards

The 2020 Plan allows us to grant performance awards. A performance award is an award that may vest or may be exercised, or that may become earned and paid, contingent upon the attainment of certain performance goals during a performance period. A performance award may require the completion of a specified period of continuous service. The length of any performance period, the performance goals to be achieved during the performance period, and the measure of whether and to what degree such performance goals have been attained will be determined by the Plan Administrator in its discretion. In addition, to the extent permitted by applicable law and the applicable award agreement, the Plan Administrator may determine that cash may be used in payment of performance awards.

Performance goals under the 2020 Plan will be established by the board of directors for a performance period. The performance criteria used to establish such goals may be based on any measure of performance selected by the board of directors.

Performance goals may be based on a Company-wide basis, with respect to one or more business units, divisions, affiliates or business segments, and in either absolute terms or relative to the performance of one or more comparable companies or the performance of one or more relevant indices. Unless specified otherwise by the Plan Administrator (i) in the award agreement at the time the award is granted or (ii) in such other document setting forth the performance goals at the time the performance goals are established, the Plan Administrator will appropriately make adjustments in the method of calculating the attainment of the performance goals for a performance period as follows: (1) to exclude restructuring and/or other nonrecurring charges; (2) to exclude exchange rate effects; (3) to exclude the effects of changes to generally accepted accounting principles; (4) to exclude the effects of any statutory adjustments to corporate tax rates; (5) to exclude the effects of items that are “unusual” in nature or occur “infrequently” as determined under generally accepted accounting principles; (6) to exclude the dilutive effects of acquisitions or joint ventures; (7) to assume that any business divested by the Company achieved performance objectives at targeted levels during the balance of a performance period following such divestiture; (8) to exclude the effect of any change in the outstanding shares of common stock of the Company by reason of any stock dividend or split, stock repurchase, reorganization, recapitalization, merger, consolidation,spin-off, combination or exchange of shares or other similar corporate change, or any distributions to common stockholders other than regular cash dividends; (9) to exclude the effects of stock based compensation and the award of bonuses under the Company’s bonus plans; (10) to exclude costs incurred in connection with potential acquisitions or divestitures that are required to be expensed under generally accepted accounting principles; (11) to exclude the goodwill and intangible asset impairment charges that are required to be recorded under generally accepted accounting principles; and (12) to exclude the effects of the timing of acceptance for review and/or approval of submissions to the U.S. Food and Drug Administration or any other regulatory body.

In addition, the Plan Administrator retains the discretion to define the manner of calculating the performance criteria it selects to use for a performance period and to reduce, increase or eliminate the compensation or economic benefit due upon the attainment of any performance goal.

Clawback Policy

Awards granted under the 2020 Plan will be subject to recoupment in accordance with any clawback policy that we are required to adopt pursuant to the listing standards of any national securities exchange or association on which our securities are listed or as is otherwise required by the Dodd-Frank Wall Street Reform and Consumer Protection Act or other applicable law, and any other clawback policy that the Company adopts. In addition, the board of directors may impose such other clawback, recovery or recoupment provisions in an award agreement as the board of directors determines necessary or appropriate, including but not limited to a reacquisition right in respect of previously acquired shares of common stock or other cash or property upon the occurrence of cause.

Changes to Capital Structure

In the event of certain capitalization adjustments, the Plan Administrator will appropriately and proportionately adjust: (i) the class(es) and maximum number of shares of our common stock subject to the 2020 Plan; (ii) the class(es) and maximum number of shares of our common stock that may be issued pursuant to the exercise of ISOs; and (iii) the class(es) and number of shares of our common stock and the exercise, strike or purchase price per share of our common stock subject to outstanding awards.

Corporate Transaction and Change in Control

The following applies to each outstanding award under the 2020 Plan in the event of a corporate transaction (as defined in the 2020 Plan and described below) or a change in control (as defined in the 2020 Plan and described below), unless provided otherwise in the applicable award agreement or in any other written agreement between a participant and the Company or an affiliate. For purposes of this Proposal 4, the term “Transaction” will mean such corporate transaction or change in control.

In the event of a Transaction, any awards outstanding under the 2020 Plan may be assumed, continued or substituted for by any surviving or acquiring corporation (or its parent company) (such entity, the “acquiring entity”), and any reacquisition or repurchase rights held by us with respect to the award may be assigned to the acquiring entity. If the acquiring entity does not assume, continue or substitute for such awards, then with respect to any such awards that are held by participants whose continuous service has not terminated prior to the effective time of the Transaction (such participants, the “current participants”), the vesting (and exercisability, if applicable) of such awards will be accelerated in full to a date prior to the effective time of the Transaction (contingent upon the effectiveness of the Transaction), and such awards will terminate if not exercised (if applicable) at or prior to the effective time of the Transaction, and any reacquisition or repurchase rights held by us with respect to such awards will lapse (contingent upon the effectiveness of the Transaction). With respect to the vesting of performance awards that will accelerate upon the occurrence of a Transaction and that have multiple vesting levels depending on the level of performance, unless otherwise provided in the relevant award agreement, the vesting of such performance awards will accelerate at 100% of the target level upon the occurrence of the Transaction. If the acquiring entity does not assume, continue or substitute for such awards, then any such awards that are held by persons other than current participants will terminate if not exercised (if applicable) at or prior to the effective time of the Transaction, except that any reacquisition or repurchase rights held by us with respect to such awards will not terminate and may continue to be exercised notwithstanding the Transaction.

In the event an award will terminate if not exercised at or prior to the effective time of a Transaction, the Plan Administrator may provide that the holder of such award may not exercise such award but instead will receive a payment equal in value to the excess, if any, of (i) the value of the property the participant would have received upon the exercise of the award, over (ii) any exercise price payable by such holder in connection with such exercise.

Under the 2020 Plan, a “corporate transaction” generally means the consummation of any one or more of the following events: (1) a sale or other disposition of all or substantially all of our assets; (2) a sale or other

disposition of at least 50% of our outstanding securities; (3) a merger, consolidation or similar transaction where we do not survive the transaction; or (4) a merger, consolidation or similar transaction where we do survive the transaction but the shares of our common stock outstanding immediately before such transaction are converted or exchanged into other property by virtue of the transaction.

Under the 2020 Plan, a “change in control” generally means the occurrence of any one or more of the following events: (1) the acquisition by any person, entity or group of our securities representing more than 50% of the combined voting power of our then outstanding securities, other than by virtue of a merger, consolidation, or similar transaction; (2) a consummated merger, consolidation or similar transaction in which our stockholders immediately before such transaction do not own, directly or indirectly, more than 50% of the combined voting power of the surviving entity (or the parent of the surviving entity) in substantially the same proportions as their ownership immediately prior to such transaction; (3) a consummated sale, lease, exclusive license or other disposition of all or substantially all of our assets, other than to an entity, more than 50% of the combined voting power of which is owned by our stockholders in substantially the same proportions as their ownership of our outstanding voting securities immediately prior to such transaction; or (4) when a majority of our board of directors becomes comprised of individuals who were not serving on our board of directors on the date the 2020 Plan was adopted by our board of directors (the “incumbent board of directors”), or whose nomination, appointment, or election was not approved by a majority of the incumbent board of directors still in office.

Plan Amendments and Termination

The Plan Administrator will have the authority to amend or terminate the 2020 Plan at any time. However, except as otherwise provided in the 2020 Plan, no amendment or termination of the 2020 Plan may materially impair a participant’s rights under his or her outstanding awards without the participant’s consent. We will obtain stockholder approval of any amendment to the 2020 Plan as required by applicable law and listing requirements.

U.S. Federal Income Tax Consequences

The following is a summary of the principal United States federal income tax consequences to participants and us with respect to participation in the 2020 Plan. This summary is not intended to be exhaustive and does not discuss the income tax laws of any local, state or foreign jurisdiction in which a participant may reside. The information is based upon current federal income tax rules and therefore is subject to change when those rules change. Because the tax consequences to any participant may depend on his or her particular situation, each participant should consult the participant’s tax adviser regarding the federal, state, local and other tax consequences of the grant or exercise of an award or the disposition of stock acquired the 2020 Plan. The 2020 Plan is not qualified under the provisions of Section 401(a) of the Internal Revenue Code of 1986, as amended, (the “Code”) and is not subject to any of the provisions of the Employee Retirement Income Security Act of 1974. Our ability to realize the benefit of any tax deductions described below depends on our generation of taxable income as well as the requirement of reasonableness and the satisfaction of our tax reporting obligations.

Nonstatutory Stock Options

Generally, there is no taxation upon the grant of an NSO if the stock option is granted with an exercise price equal to the fair market value of the underlying stock on the grant date. Upon exercise, a participant will recognize ordinary income equal to the excess, if any, of the fair market value of the underlying stock on the date of exercise of the stock option over the exercise price. If the participant is employed by us or one of our affiliates, that income will be subject to withholding taxes. The participant’s tax basis in those shares will be equal to his or her fair market value on the date of exercise of the stock option, and the participant’s capital gain holding period for those shares will begin on that date.

Subject to the requirement of reasonableness, the provisions of Section 162(m) of the Code, and the satisfaction of a tax reporting obligation, we will generally be entitled to a tax deduction equal to the taxable ordinary income realized by the participant.

Incentive Stock Options

The 2020 Plan provides for the grant of stock options that are intended to qualify as “incentive stock options,” as defined in Section 422 of the Code. Under the Code, a participant generally is not subject to ordinary income tax upon the grant or exercise of an ISO. If the participant holds a share received upon exercise of an ISO for more than two years from the date the stock option was granted and more than one year from the date the stock option was exercised, which is referred to as the required holding period, the difference, if any, between the amount realized on a sale or other taxable disposition of that share and the participant’s tax basis in that share will be long-term capital gain or loss.

If, however, a participant disposes of a share acquired upon exercise of an ISO before the end of the required holding period, which is referred to as a disqualifying disposition, the participant generally will recognize ordinary income in the year of the disqualifying disposition equal to the excess, if any, of the fair market value of the share on the date of exercise of the stock option over the exercise price. However, if the sales proceeds are less than the fair market value of the share on the date of exercise of the stock option, the amount of ordinary income recognized by the participant will not exceed the gain, if any, realized on the sale. If the amount realized on a disqualifying disposition exceeds the fair market value of the share on the date of exercise of the stock option, that excess will be short-term or long-term capital gain, depending on whether the holding period for the share exceeds one year.

For purposes of the alternative minimum tax, the amount by which the fair market value of a share of stock acquired upon exercise of an ISO exceeds the exercise price of the stock option generally will be an adjustment included in the participant’s alternative minimum taxable income for the year in which the stock option is exercised. If, however, there is a disqualifying disposition of the share in the year in which the stock option is exercised, there will be no adjustment for alternative minimum tax purposes with respect to that share. In computing alternative minimum taxable income, the tax basis of a share acquired upon exercise of an ISO is increased by the amount of the adjustment taken into account with respect to that share for alternative minimum tax purposes in the year the stock option is exercised.

We are not allowed a tax deduction with respect to the grant or exercise of an ISO or the disposition of a share acquired upon exercise of an ISO after the required holding period. If there is a disqualifying disposition of a share, however, we will generally be entitled to a tax deduction equal to the taxable ordinary income realized by the participant, subject to the requirement of reasonableness, the provisions of Section 162(m) of the Code, and provided that either the employee includes that amount in income or we timely satisfy our reporting requirements with respect to that amount.

Restricted Stock Awards

Generally, the recipient of a restricted stock award will recognize ordinary income at the time the stock is received equal to the excess, if any, of the fair market value of the stock received over any amount paid by the recipient in exchange for the stock. If, however, the stock is not vested when it is received (for example, if the employee is required to work for a period of time in order to have the right to sell the stock), the recipient generally will not recognize income until the stock becomes vested, at which time the recipient will recognize ordinary income equal to the excess, if any, of the fair market value of the stock on the date it becomes vested over any amount paid by the recipient in exchange for the stock. A recipient may, however, file an election with the Internal Revenue Service, within 30 days following his or her receipt of the restricted stock award, to recognize ordinary income, as of the date the recipient receives the restricted stock award, equal to the excess, if any, of the fair market value of the stock on the date the restricted stock award is granted over any amount paid by the recipient for the stock.

The recipient’s basis for the determination of gain or loss upon the subsequent disposition of shares acquired from a restricted stock award will be the amount paid for such shares plus any ordinary income recognized either when the stock is received or when the stock becomes vested.

Subject to the requirement of reasonableness, the provisions of Section 162(m) of the Code, and the satisfaction of a tax reporting obligation, we will generally be entitled to a tax deduction equal to the taxable ordinary income realized by the recipient of the restricted stock award.

Restricted Stock Unit Awards

Generally, the recipient of a restricted stock unit award structured to comply with the requirements of Section 409A of the Code or an exception to Section 409A of the Code will recognize ordinary income at the time the stock is delivered equal to the excess, if any, of the fair market value of the stock received over any amount paid by the recipient in exchange for the stock. To comply with the requirements of Section 409A of the Code, the stock subject to a restricted stock unit award may generally only be delivered upon one of the following events: a fixed calendar date (or dates), separation from service, death, disability or a change in control. If delivery occurs on another date, unless the restricted stock unit award otherwise complies with or qualifies for an exception to the requirements of Section 409A of the Code (including delivery upon achievement of a performance goal), in addition to the tax treatment described above, the recipient will owe an additional 20% federal tax and interest on any taxes owed.

The recipient’s basis for the determination of gain or loss upon the subsequent disposition of shares acquired from a restricted stock unit award will be the amount paid for such shares plus any ordinary income recognized when the stock is delivered.

Subject to the requirement of reasonableness, the provisions of Section 162(m) of the Code, and the satisfaction of a tax reporting obligation, we will generally be entitled to a tax deduction equal to the taxable ordinary income realized by the recipient of the restricted stock unit award.

Stock Appreciation Rights

Generally, if a stock appreciation right is granted with an exercise price equal to the fair market value of the underlying stock on the grant date, the recipient will recognize ordinary income equal to the fair market value of the stock or cash received upon such exercise. Subject to the requirement of reasonableness, the provisions of Section 162(m) of the Code, and the satisfaction of a tax reporting obligation, we will generally be entitled to a tax deduction equal to the taxable ordinary income realized by the recipient of the stock appreciation right.

Section 162(m) Limitations

Under Section 162(m) of the Code, compensation paid to any publicly held corporation’s “covered employees” that exceeds $1 million per taxable year for any covered employee is generallynon-deductible. Awards granted under the 2020 Plan will be subject to the deduction limit under Section 162(m) of the Code and will not be eligible to qualify for the performance-based compensation exception under Section 162(m) of the Code pursuant to the transition relief provided by the Tax Cuts and Jobs Act. For further information regarding the deduction limit under Section 162(m) of the Code and such transition relief, please see the section entitled “Compensation Discussion and Analysis — Tax Deductibility of Executive Compensation.”

New Plan Benefits under 2020 Plan

The following table sets forth certain information regarding future benefits under the 2020 Plan.

Proposal 5

Approval of Certificate of Amendment of the Amended and Restated Certificate of Incorporation

to Increase the Total Number of Authorized Shares of Common Stock

Overview

Our board of directors has determined that it is advisable and in the best interests of the Company and in the best interests of our stockholders to amend our amended and restated certificate of incorporation (our “charter”), to increase the total number of authorized shares of common stock from 250,000,000 shares to 445,000,000350,000,000 shares. On April 27, 2020,March 22, 2021, our board of directors adopted resolutions approving the proposed certificate of amendment of our charter (the “certificate of amendment”) in substantially the form attached hereto as Appendix B.A. At that time, our board of directors declared the proposed certificate of amendment to be advisable and in the best interests of the Company and our stockholders and is accordingly submitting the proposed certificate of amendment for approval by our stockholders.

If our stockholders approve this Proposal 5,4, we expect to file the certificate of amendment with the Secretary of State of the State of Delaware to increase the number of authorized shares of our common stock as soon as practicable following stockholder approval. In this regard, upon filing of the certificate of amendment with the Secretary of State of the State of Delaware, the first paragraph of section four of our charter would be amended as follows, with the proposed additions double-underlined and proposed deletions stricken through:

“4.Number of Shares. The total number of shares of all classes of stock that the Corporation shall have authority to issue isTwo Hundred Eighty Million (280,000,000)FourThree Hundred Seventy FiveEighty Million (475,000,000)(380,000,000) shares consisting of:Two Hundred Fifty Million (250,000,000)FourThree Hundred Forty FiveFifty Million (445,000,000)(350,000,000) shares of common stock, $.001 par value per share (“Common Stock”); and Thirty Million (30,000,000) shares of preferred stock, $.001 par value per share (“Preferred Stock”).”

Of the 250,000,000 shares of our common stock currently authorized, as of the close of business on April 30, 2020,March 12, 2021, there were 214,286,337215,180,173 shares of common stock outstanding. In addition to the 214,286,337215,180,173 shares of common stock outstanding on April 30, 2020,March 12, 2021, as of April 30, 2020:March 12, 2021:

The proposed certificate of amendment would increase the number of shares of common stock that the Company is authorized to issue from 250,000,000 shares of common stock to 445,000,000350,000,000 shares of common stock, representing an increase of 195,000,000100,000,000 shares of authorized common stock, with a corresponding increase in the total authorized capital stock, which includes common stock and preferred stock, from 280,000,000 shares to 475,000,000380,000,000 shares.

approval. These purposes maywhich include establishing strategic relationships with other companies; expanding our business through the acquisition of other businesses, therapeutics or product candidates; raising capital; providing equity incentives to employees, officers, directors, consultants and/or advisors; stock splits and stock dividends; and other purposes. For example, we will need to raise substantial additional capital to, among other things, fund our operations, conduct and/or complete clinical trials, continue our research and development activities, seek regulatory approval for our product candidates and commercialize our product candidates, if any such product candidates receive regulatory approval for commercial sale, and the additional shares may be used for a financing if we have an appropriate opportunity. If this Proposal 54 is not approved by our stockholders, it is possible that our business development and financing alternatives for us may be limited by the lack of sufficient unissued and unreserved authorized shares of common stock, and stockholder value may be harmed, perhaps severely, by this limitation. In addition, our success depends in part on our continued ability to attract, retain and motivate highly qualified management and clinical and scientific personnel, and if this Proposal 54 is not approved by our stockholders, the lack of sufficient unissued and unreserved authorized shares of common stock to provide future equity incentive opportunities that our compensation committee deems appropriate could adversely impact our ability to achieve these goals. In summary, if our stockholders do not approve this Proposal 5,4, we may not be able to access the capital markets, complete corporate collaborations or partnerships, attract, retain and motivate employees, and pursue other business opportunities integral to our growth and success, all of which could severely harm our business and our prospects.

Effects of the Increase in Authorized Shares

The additional common stock to be authorized by stockholder approval of this Proposal 54 would have rights identical to the currently outstanding shares of our common stock. Approval of this Proposal 54 and issuance of the additional authorized shares of common stock would not affect the rights of the holders of currently outstanding shares of our common stock, except for effects incidental to increasing the number of shares of our common stock outstanding, such as dilution of any earnings per share and voting rights of current holders of common stock. The additional shares of common stock authorized by the approval of this Proposal 54 could be issued by our board of directors without further vote of our stockholders except as may be required in particular cases by our charter, applicable law, regulatory agencies or the rules of the Nasdaq. Under our charter, stockholders do not have preemptive rights to subscribe to additional securities that may be issued by us, which means that current stockholders do not have a prior right thereunder to purchase any new issue of common stock in order to maintain their proportionate ownership interests in our Company.

The proposed certificate of amendment to increase the number of authorized shares of our common stock could, under certain circumstances, have an anti-takeover effect. The additional shares of common stock that would become available for issuance if this Proposal 54 is approved could also be used by us to oppose a hostile takeover attempt or to delay or prevent changes in control or our management. For example, without further stockholder approval, the board could adopt a “poison pill” which would, under certain circumstances related to an acquisition of our securities not approved by the board, give certain holders the right to acquire additional shares of common stock at a low price, or the board could strategically sell shares of common stock in a private transaction to purchasers who would oppose a takeover or favor the current board. Although this Proposal 54 to increase the authorized common stock has been prompted by business and financial considerations and not by the threat of any hostile takeover attempt (nor is the board currently aware of any such attempts directed at us), nevertheless, stockholders should be aware that approval of this Proposal 54 could facilitate future efforts by us to deter or prevent changes in control, including transactions in which the stockholders might otherwise receive a premium for their shares over then current market prices.

directors may, in its sole discretion, abandon the proposed certificate of amendment of our charter and determine, prior to the filing of certificate of amendment of our charter with the Secretary of State of the State of Delaware, not to effect the proposed amendment to our charter to increase the number of authorized shares of our common stock from 250,000,000 shares to 445,000,000350,000,000 shares. If this Proposal 54 is approved by our stockholders and our board of directors determines to exercise such discretion, we will publicly disclose that fact and our board of directors’ reason or reasons for its determination.

Vote Required

The affirmative vote of the holders of a majority of the outstanding shares on the record date. Abstentions will be counted toward the vote total for Proposal 54 and will have the same effect as “Against” votes.

The board recommends that you vote “FOR” the proposal to approve the amendment of our charter.

CAR⁺T Program

Expanding Resources

We believe that by structuring the executive compensation program so that a significant portion of each of our named executive officers’ pay is at risk, including a meaningful equity-based component, we can best ensure our named executive officers are incentivized to maximize our performance and increase value for our stockholders. To this end, our program is comprised of three primary elements:

These performance factors are considered by our compensation committee in connection with our annual performance reviews described below and are a critical component in the determination of annual cash and equity incentive awards for our executives.

Role of our Compensation Committee, Management and Consultant

Compensation Committee

Our compensation committee is responsible for reviewing, evaluating, approving, administering and interpreting our executive compensation and benefits policies, programs and plans, including our equity compensation plans. In particular, with respect to the compensation of our named executive officers, our

As part of its duties, Haigh provided the compensation committee with the following services:

During 2019,Beginning in March 2020, our compensation committee engaged FW Cook as its independent compensation consultant. FW Cook provided independent market findings to the compensation committee conducted a performancein August 2020 and independence assessment of Haigh with respect to Haigh’s role in recommending or determining the amount and form of executive compensation during the fiscal year ended December 31, 2019. Other than providing limitedhas provided advice to our management and our compensation committee regarding competitive salary data, Haigh did not provide any other services to us in 2019. The compensation committee also considered that the individual representative of Haigh who works directly with the compensation committee has no other business relationships with the board, management or the Company, Haigh’s own policies on ethics, stock ownershipas to Interim Chief Executive Officer compensation andnon-employee director compensation in 2021. FW Cook was determined to be free of conflicts of interest and the total revenue that Haigh received from us in 2019 and how this amount comparedable to Haigh’s 2019 total gross revenues. As a result, theoperate as an independent compensation committee concluded that Haigh’s services to the compensation committee during 2019 did not raise any conflict of interest.advisor.

Peer Group, Survey Sources and Market Data

Peer Group

In November 2018, in consultation with Haigh, the compensation committee evaluated the list of companies that should be included in the peer group used as a reference point in determining 2019 compensation, which we refer to as the 2018 peer group. The selected 2018 peer group companies were chosen based upon the following selection criteria:

The compensation committee determined that the foregoing selection criteria were relevant for selecting the 2018 peer group because at such time we had approximately 46 employees, a market value of approximately $384.0 million and an R&D trailing expense of approximately $40.0 million. The following 19 companies were approved by the compensation committee as the 2018 peer group for purposes of determining the January 2019 equity grants and in setting 2019 base salary and bonus target levels:

In November 2019, in consultation with Haigh, the compensation committee evaluated the list of companies that should be included in the peer group used as a reference point in making 2020 executive compensation decisions, which we refer to as the 2019 peer group. The selected 2019 peer group companies were chosen based upon the following selection criteria:

When determining Drs. Cooper and Mauney’s 2019the 2020 base salaries of our named executive officers, the compensation committee considered 20182019 performance, that the base salaries of Dr. Cooper’s base salary had notCooper, Mr. Hadfield and Dr. de Groot were increased since he joined the Companysignificantly in 20152019 and that Dr. Mauney had been recently promoted to President.Mr. Shukla’s salary was below the 2019 peer group data. These factors played a role in the compensation committee’s determination not to increase Drs.Dr. Cooper’s base salary and Mauney’s salaries by 14.6% and 10.0%, respectively. The compensation committee determined to increase the base salaries of Messrs.Mr. Hadfield and LafondDr. de Groot by 5.7% and 2.4%, respectively,only 2.0%. The compensation committee increased the base salary of Mr. Shukla’s by 5.1% to position their salarieshis salary near the middle of market data. As noted above, Dr. Baffa was hired in 2020, and therefore, Dr. Baffa was not eligible for an increase in his base salary in 2020.