Stock-Based Compensation | 10. Stock-Based Compensation As of March 31, 2024 and December 31, 2023 , there were 500,000,000 shares of common stock authorized. As of March 31, 2024 and December 31, 2023, there were 145,927,863 and 145,207,497 shares of common stock issued and outstanding, respectively. Employee Equity Plans The Instructure Parent, LP Incentive Equity Plan (the “2020 Plan”) was terminated in July 2021 in connection with the Company’s initial public offering (the “IPO”). As of the IPO date 6,126,802 unvested incentive units were exchanged for 3,496,739 RSUs under the 2021 Plan. These RSUs will generally vest in 11 equal quarterly installments commencing September 1, 2021. In July 2021, our board of directors adopted the 2021 Omnibus Incentive Plan (the “2021 Plan”) and no shares remain available for issuance under the 2020 Plan. A total of 18,000,000 shares of the Company's common stock were initially reserved for issuance under the 2021 Plan. Pursuant to the terms of the 2021 Plan, the share reserve increased by 5,808,300 shares in January 2024. As of March 31, 2024, we had 24,034,135 shares of common stock available for future grants under the 2021 Plan. In July 2021, our board of directors adopted, and our stockholders approved the 2021 Employee Stock Purchase Plan (the “2021 ESPP”), which allows eligible employees to purchase shares of our common stock at a discount through payroll deductions of up to 15 % of their eligible compensation, subject to any plan limitations. Each new offering period begins on or about March 1 and September 1 and is approximately six months in duration. On each purchase date, eligible employees will purchase our common stock at a price per share equal to 85 % of the lesser of (1) the fair market value of our common stock on the offering date or (2) the fair market value of our common stock on the purchase date. A total of 1,900,000 shares of the Company’s common stock were initially reserved for issuance under the 2021 ESPP. Pursuant to the terms of the 2021 ESPP, the share reserve increased by 1,452,075 shares in January 2024. As of March 31, 2024, 5,304,954 shares of common stock were available for purchase under the 2021 ESPP. During the three months ended March 31, 2024, we granted 1,739,348 RSUs to employees under the 2021 Plan. Each RSU entitles the recipient to receive one share of the Company ’s common stock upon vesting. The RSUs are subject to time-based service requirements and generally vest over a four-year service period. The grant date fair value of the RSUs granted during the three months ended March 31, 2024 ranged from $ 21.45 to $ 25.41 , which represents the closing stock price for the underlying common stock on the respective grant dates, with an aggregate fair value of $ 42.8 million. The following two tables present stock-based compensation by award type and where the stock-based compensation expense was recorded in our condensed consolidated statements of operations and comprehensive loss (in thousands): Three months ended 2024 2023 Restricted stock units 12,048 9,599 Shares issuable under employee stock purchase plan 397 411 Total stock-based compensation $ 12,445 $ 10,010 Three months ended 2024 2023 Subscription and support cost of revenue $ 565 $ 379 Professional services and other cost of revenue 644 414 Sales and marketing 3,114 2,528 Research and development 3,840 3,174 General and administrative 4,282 3,515 Total stock-based compensation $ 12,445 $ 10,010 Restricted Stock Units The following table summarizes the activity of RSUs for the three months ended March 31, 2024 (in thousands, except per unit amounts): RSUs Weighted Average Grant Date Fair Value Per Unit Unvested and outstanding at December 31, 2023 4,470 $ 23.68 Granted 1,739 24.60 Vested ( 394 ) 23.59 Forfeited or canceled ( 288 ) 22.97 Unvested and outstanding at March 31, 2024 5,527 $ 23.98 As of March 31, 2024 and December 31, 2023, total unrecognized compensation cost related to unvested RSUs amounted to $ 123.3 million and $ 95.1 million, respectively, which is expected to be recognized over a weighted average period of 3.0 years and 2.9 years, respectively. The following table summarizes the activity of the incentive units granted under the 2020 Plan, subsequent to their conversion into RSUs under the 2021 Plan, for the three months ended March 31, 2024 (in thousands, except per unit amounts): RSUs Weighted Average Grant Date Fair Value Per Unit Unvested and outstanding at December 31, 2023 320 $ 12.30 Vested ( 229 ) 12.86 Unvested and outstanding at Mach 31, 2024 91 $ 10.87 There were no incentive units granted subsequent to December 31, 2021. As of March 31, 2024 and December 31, 2023, we had $ 0.7 million and $ 2.4 million, respectively, of unrecognized stock-based compensation expense related to unvested incentive units exchanged for RSUs that are expected to be recognized over a weighted-average period of 0.2 and 0.3 years, respectively. 2021 ESPP The following table summarizes the assumptions relating to 2021 ESPP purchase rights used in a Black-Scholes option pricing model for the three months ended March 31, 2024 and 2023: Three months ended 2024 2023 Dividend yield None None Volatility 18 % 25 - 32 % Risk-free interest rate 5.27 - 5.47 % 3.34 - 5.20 % Expected life (years) 0.5 0.5 |