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Stockholders' Equity | 12 Months Ended
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Dec. 31, 2023
Stockholders' Equity [Abstract] |
Stockholders' Equity | 8. Stockholders’ Equity Preferred Stock We are authorized to issue up to 15 million shares of “blank check” Preferred Stock. As of December 31, 2023, there were no shares of Preferred Stock outstanding. We have designated Series C Junior Participating Preferred Stock but have no issued or outstanding shares as of December 31, 2023. Common Stock At December 31, 2023 and 2022, we had 300 million shares of common stock authorized, of which 144.3 million and 142.1 million were issued and outstanding, respectively. As of December 31, 2023, total common shares reserved for future issuance were 49.7 million. During the years ended December 31, 2023, 2022 and 2021, we issued 2.3 million, 1.2 million and 1.1 million shares of common stock, respectively, for stock option exercises, vesting of restricted stock units, and ESPP purchases. We received net proceeds from these transactions of $49.4 million, $6.4 million and $11.6 million in 2023, 2022 and 2021, respectively. Stock Plans 1989 Stock Option Plan In 1989, our Board of Directors adopted, and the stockholders subsequently approved, a stock option plan that, as amended, provides for the issuance of non-qualified and incentive stock options for the purchase of up to 20.0 million shares of common stock to our employees, directors, and consultants. The plan expires in January 2024. The 1989 Stock Option Plan, or 1989 Plan, does not allow us to grant stock bonuses or restricted stock awards and prohibits us from repricing any options outstanding under the plan unless our stockholders approve the repricing. Options vest over a four-year period, with 25 percent exercisable at the end of one year from the date of the grant and the balance vesting ratably, on a monthly basis, thereafter and have a term of seven years. At December 31, 2023, no options were outstanding and 68,000 shares were available for future grant under the 1989 Plan. 2011 Equity Incentive Plan In 2011, our Board of Directors adopted, and the stockholders subsequently approved, a stock option plan that provides for the issuance of stock options, stock appreciation rights, restricted stock awards, restricted stock unit awards, and performance cash awards to our employees, directors, and consultants. In June 2015, May 2017 and June 2019, after receiving approval from our stockholders, we amended our 2011 Equity Incentive Plan, or 2011 Plan, to increase the total number of shares reserved for issuance. We increased the shares available under our 2011 Equity Incentive Plan from 5.5 million to 11.0 million in June 2015, from 11.0 million to 16.0 million in May 2017 and from 16.0 million to 23.0 million in June 2019. In June 2021, after receiving approval from our stockholders, we amended our 2011 Plan. The amendment increased the total number of shares of common stock authorized for issuance under the 2011 Plan from 23.0 million to 29.7 million and added a fungible share counting ratio whereby the share reserve will be reduced by 1.7 shares for each share of common stock issued pursuant to a full value award (i.e., RSU or PRSU) and increased by 1.7 shares for each share of common stock returning from a full value award. In June 2023, after receiving approval from our stockholders, we amended our 2011 Plan to increase the total number of shares of common stock authorized for issuance under the 2011 Plan from 29.7 million to 35.2 million. The plan expires in June 2031. The 2011 Plan does not allow us to reduce the exercise price of any outstanding stock options or stock appreciation rights or cancel any outstanding stock options or stock appreciation rights that have an exercise price or strike price greater than the current fair market value of the common stock in exchange for cash or other stock awards unless our stockholders approve such action. Currently we anticipate awarding only stock options, RSU and PRSU awards to our employees, directors and consultants. Options vest over a four-year period, with 25 percent exercisable at the end of one year from the date of the grant and the balance vesting ratably, on a monthly basis, thereafter and have a term of seven years. Options granted after December 31, 2021 have a term of ten years. We have granted restricted stock unit awards to our employees under the 2011 Plan which vest annually over a four-year period. At December 31, 2023, a total of 12.8 million options were outstanding, of which 8.7 million were exercisable, 3.3 million restricted stock unit awards were outstanding, and 8.0 million shares were available for future grant under the 2011 Plan. Under the 2011 Plan, we may issue a stock award with additional acceleration of vesting and exercisability upon or after a change in control. In the absence of such provisions, no such acceleration will occur. In addition, we implemented a change of control and severance benefit plan that provides for change of control and severance benefits to our executive officers, including our chief executive officer and chief financial officer, and vice presidents. If one of our executive officers or vice presidents is terminated or resigns for good reason during the period that begins three months before and ends twelve months following a change in control of the company, the impacted employee’s stock options and RSUs vesting will accelerate for options and RSUs outstanding as of the termination date. 2020 Equity Incentive Plan In connection with the Akcea Merger in 2020, we assumed the unallocated portion of the available share reserve under the Akcea 2015 Equity Incentive Plan. In 2020, we amended and restated the Akcea 2015 equity plan, including renaming the plan as the Ionis Pharmaceuticals, Inc. 2020 Equity Incentive Plan, or 2020 Plan. The 2020 Plan provided for the issuance of up to 2.6 million shares of our Common Stock to our employees, directors and consultants who were employees of Akcea prior to the Akcea Merger. In the second quarter of 2021, our Compensation Committee approved an amendment to the 2020 Plan. The amendment decreased the total number of shares of common stock authorized for issuance under the 2020 Plan from approximately 2.6 million to 1.6 million. We assumed the 2020 Plan in connection with Ionis’ reacquisition of all of the outstanding shares of Akcea Therapeutics, Inc. as part of the Akcea Merger. The plan expires in December 2025. The 2020 Plan does not allow us to reduce the exercise price of any outstanding stock options or stock appreciation rights or cancel any outstanding stock options or stock appreciation rights that have an exercise price or strike price greater than the current fair market value of the common stock in exchange for cash or other stock awards unless our stockholders approve such action. Currently we anticipate awarding only stock options and RSU awards to our eligible employees, directors and consultants. Options vest over a four-year period, with 25 percent exercisable at the end of one year from the date of the grant and the balance vesting ratably, on a monthly basis, thereafter and have a term of seven years. Options granted after December 31, 2021 have a term of ten years. We have granted restricted stock unit awards to our employees under the 2020 Plan which vest annually over a four-year period. At December 31, 2023, a total of 0.4 million options were outstanding, of which 0.1 million were exercisable, 0.2 million restricted stock unit awards were outstanding, and 1.0 million shares were available for future grant under the 2020 Plan. Under the 2020 Plan, we may issue a stock award with additional acceleration of vesting and exercisability upon or after a change in control. In the absence of such provisions, no such acceleration will occur. Corporate Transactions and Change in Control under 2011 and 2020 Plans In the event of certain significant corporate transactions, our Board of Directors has the discretion to take one or more of the following actions with respect to outstanding stock awards under the 2011 and 2020 Plans:
| ● | arrange for assumption, continuation, or substitution of a stock award by a surviving or acquiring entity (or its parent company);
| ● | arrange for the assignment of any reacquisition or repurchase rights applicable to any shares of our common stock issued pursuant to a stock award to the surviving or acquiring corporation (or its parent company);
| ● | accelerate the vesting and exercisability of a stock award followed by the termination of the stock award;
| ● | arrange for the lapse of any reacquisition or repurchase rights applicable to any shares of our common stock issued pursuant to a stock award;
| ● | cancel or arrange for the cancellation of a stock award, to the extent not vested or not exercised prior to the effective date of the corporate transaction, in exchange for cash consideration, if any, as the Board, in its sole discretion, may consider appropriate; and
| ● | arrange for the surrender of a stock award in exchange for a payment equal to the excess of (a) the value of the property the holder of the stock award would have received upon the exercise of the stock award, over (b) any exercise price payable by such holder in connection with such exercise.
2002 Non-Employee Directors’ Stock Option Plan In 2001, our Board of Directors adopted, and the stockholders subsequently approved, an amendment and restatement of the 1992 Non-Employee Directors’ Stock Option Plan, which provides for the issuance of non-qualified stock options and restricted stock units to our non-employee directors. The name of the resulting plan is the 2002 Non-Employee Directors’ Stock Option Plan, or the 2002 Plan. In 2015, after receiving approval from our stockholders, we amended our 2002 Plan to increase the total number of shares reserved for issuance from 1.2 million to 2.0 million. In 2020, after receiving approval from our stockholders, we further amended our 2002 Plan. The amendments included:
| ● | An increase to the total number of shares reserved for issuance under the plan from 2.0 million to 2.8 million shares;
| ● | A reduction to the amount of the automatic awards under the plan;
| ● | A revision to the vesting schedule of new awards granted; and
| ● | An extension of the term of the plan.
Options under this plan expire 10 years from the date of grant. At December 31, 2023, a total of 0.9 million options were outstanding, of which 0.9 million were exercisable, 40,000 restricted stock unit awards were outstanding, and 0.5 million shares were available for future grant under the 2002 Plan. Employee Stock Purchase Plan In 2009, our Board of Directors adopted, and the stockholders subsequently approved, the amendment and restatement of the ESPP and we reserved an additional 150,000 shares of common stock for issuance thereunder. In each of the subsequent years until 2019, we reserved an additional 150,000 shares of common stock for the ESPP resulting in a total of 3.2 million shares authorized under the plan as of December 31, 2023. The ESPP permits full-time employees to purchase common stock through payroll deductions (which cannot exceed 10 percent of each employee’s compensation) at the lower of 85 percent of fair market value at the beginning of the purchase period or the end of each purchase period. Under the amended and restated ESPP, employees must hold the stock they purchase for a minimum of six months from the date of purchase. During 2023, employees purchased and we issued to employees 0.1 million shares under the ESPP at a weighted average price of $30.53 per share. At December 31, 2023, there were 0.4 million shares available for purchase under the ESPP. Stock Option Activity The following table summarizes the stock option activity under our stock plans for the year ended December 31, 2023 (in thousands, except per share and contractual life data):
|  | Number of Shares |  |  | Weighted Average Exercise Price Per Share |  |  | Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2022 |  |  | 14,970 |  |  | $ | 50.57 |  |  |  |  |  |  |
Granted |  |  | 2,407 |  |  | $ | 38.80 |  |  |  |  |  |  |
Exercised |  |  | (1,444 | ) |  | $ | 45.06 |  |  |  |  |  |  |
Cancelled/forfeited/expired |  |  | (1,842 | ) |  | $ | 55.90 |  |  |  |  |  |  |
Outstanding at December 31, 2023 |  |  | 14,091 |  |  | $ | 48.43 |  |  |  | 4.74 |  |  | $ | 78,542 |
Exercisable at December 31, 2023 |  |  | 9,703 |  |  | $ | 52.24 |  |  |  | 3.20 |  |  | $ | 28,349 |
The weighted-average estimated fair values of options granted were $19.72, $18.66 and $24.35 for the years ended December 31, 2023, 2022 and 2021, respectively. The total intrinsic value of options exercised during the years ended December 31, 2023, 2022 and 2021 were $6.0 million, $1.4 million and $2.5 million, respectively, which we determined as of the date of exercise. The amount of cash received from the exercise of stock options was $65.1 million, $3.6 million and $8.5 million for the years ended December 31, 2023, 2022 and 2021, respectively. For the year ended December 31, 2023, the weighted-average fair value of options exercised was $49.23. As of December 31, 2023, total unrecognized compensation cost related to non-vested stock options was $36.6 million. We expect to recognize this cost over a weighted average period of 1.1 years. We will adjust the total unrecognized compensation cost for future changes in estimated forfeitures. Restricted Stock Unit Activity The following table summarizes the RSU activity for the year ended December 31, 2023 (in thousands, except per share data):
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
Non-vested at December 31, 2022 |  |  | 2,766 |  |  | $ | 48.30 |
Granted |  |  | 1,707 |  |  | $ | 40.51 |
Vested |  |  | (1,055 | ) |  | $ | 51.64 |
Cancelled/forfeited |  |  | (179 | ) |  | $ | 42.90 |
Non-vested at December 31, 2023 |  |  | 3,239 |  |  | $ | 43.40 |
For the years ended December 31, 2023, 2022 and 2021, the weighted-average grant date fair value of RSUs granted was $40.51, $36.14 and $57.02 per RSU, respectively. As of December 31, 2023, total unrecognized compensation cost related to RSUs was $53.7 million. We expect to recognize this cost over a weighted average period of 1.3 years. We will adjust the total unrecognized compensation cost for future changes in estimated forfeitures. Performance Restricted Stock Unit Activity The following table summarizes the PRSU activity for the year ended December 31, 2023 (in thousands, except per share data):
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
Non-vested at December 31, 2022 |  |  | 143 |  |  | $ | 52.59 |
Granted |  |  | 158 |  |  | $ | 57.43 |
Vested |  |  | (75 | ) |  | $ | 52.43 |
Non-vested at December 31, 2023 |  |  | 226 |  |  | $ | 56.04 |
For the years ended December 31, 2023, 2022 and 2021, the weighted-average grant date fair value of PRSUs granted was $57.43, $42.28 and $77.17 per PRSU, respectively. As of December 31, 2023, total unrecognized compensation cost related to PRSUs was $4.4 million. We expect to recognize this cost over a weighted average period of 1.4 years. We will adjust the total unrecognized compensation cost for future changes in estimated forfeitures. Stock-based Compensation Expense and Valuation Information The following table summarizes stock-based compensation expense for the years ended December 31, 2023, 2022 and 2021 (in thousands):
|  | Year Ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Cost of sales |  | $ | 499 |  |  | $ | 533 |  |  | $ | 456 |
Research, development and patent |  |  | 77,826 |  |  |  | 73,704 |  |  |  | 87,522 |
Selling, general and administrative |  |  | 27,484 |  |  |  | 26,027 |  |  |  | 32,700 |
Total |  | $ | 105,809 |  |  | $ | 100,264 |  |  | $ | 120,678 |
Refer to Note 1, Organization and Significant Accounting Policies, for further details on how we determine the fair value of stock options granted, RSUs, PRSUs and stock purchase rights under the ESPP. For the years ended December 31, 2023, 2022 and 2021, we used the following weighted-average assumptions in our Black-Scholes calculations: Employee Stock Options:
|  | Year Ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Risk-free interest rate |  |  | 3.8 | % |  |  | 2.1 | % |  |  | 0.6 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Volatility |  |  | 46.8 | % |  |  | 54.5 | % |  |  | 54.0 | %
Expected life |  | 6.3 years |  |  | 6.3 years |  |  | 4.9 years |
Board of Director Stock Options:
|  | Year Ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Risk-free interest rate |  |  | 3.8 | % |  |  | 2.9 | % |  |  | 1.2 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Volatility |  |  | 52.7 | % |  |  | 56.2 | % |  |  | 55.9 | %
Expected life |  | 7.7 years |  |  | 7.4 years |  |  | 7.3 years |
ESPP:
|  | Year Ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Risk-free interest rate |  |  | 5.3 | % |  |  | 1.2 | % |  |  | 0.1 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Volatility |  |  | 36.0 | % |  |  | 50.1 | % |  |  | 42.4 | %
Expected life |  | 6 months |  |  | 6 months |  |  | 6 months |
Risk-Free Interest Rate. We base the risk-free interest rate assumption on observed interest rates appropriate for the term of our stock option plans or ESPP. Dividend Yield. We base the dividend yield assumption on our history and expectation of dividend payouts. We have not paid dividends in the past and do not expect to in the future. Volatility. We use an average of the historical stock price volatility of our stock for the Black-Scholes model. We computed the historical stock volatility based on the expected term of the awards. Expected Life. The expected term of stock options we have granted represents the period of time that we expect them to be outstanding. Historically, we estimated the expected term of options we have granted based on actual and projected exercise patterns. In 2021, our Compensation Committee approved an amendment to the 2011 Equity Incentive Plan, or 2011 Plan, and the 2020 Equity Incentive Plan, or 2020 Plan, that increased the contractual term of stock options granted under these plans from seven to ten years for stock options granted on January 1, 2022 and thereafter. We determined that we are unable to rely on our historical exercise data as a basis for estimating the expected life of stock options granted to employees following this change because the contractual term changed and we have no other means to reasonably estimate future exercise behavior. We therefore used the simplified method for determining the expected life of stock options granted to employees in the years ended December 31, 2023 and 2022. Under the simplified method, we calculate the expected term as the average of the time-to-vesting and the contractual life of the options. As we gain additional historical information, we will transition to calculating our expected term based on our historical exercise patterns. Forfeitures. We reduce stock-based compensation expense for estimated forfeitures. We estimate forfeitures at the time of grant and revise, if necessary, in subsequent periods if actual forfeitures differ from those estimates. We estimate forfeitures based on historical experience.

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