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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2024

Stock-Based Compensation

Schedule of stock option activity

​

​	​	​	​	​	​	​	​
​		​		Weighted			Weighted
​	​	​	​	Average		​	Average
​	​	​	​	Exercise		​	Remaining
​	​	​	​	Price		​	Contractual
​	​	Shares	​	Per Share		​	Term (In Years)
Options outstanding at December 31, 2023	​	6,378,924	​	$	29.69	​	7.5
Granted	​	1,959,320	​	$	36.22	​	—
Exercised	​	(679,985)	​	$	12.98	​	—
Canceled	​	(118,150)	​	$	120.67	​	—
Options outstanding at December 31, 2024	​	7,540,109	​	$	31.47	​	7.5
Options vested and expected to vest at December 31, 2024	​	7,416,025	​	$	31.41	​	7.4
Options exercisable at December 31, 2024	​	3,980,565	​	$	29.17	​	6.3
Shares available for grant under the Celldex Therapeutics, Inc. 2021 Omnibus Equity Incentive Plan (as amended, effective as of June 13, 2024) at December 31, 2024	​	2,372,333	​	​	—	​	—

Schedule of stock-based compensation expense

​

​	​	​	​	​	​	​	​	​	​
​		2024			2023			2022
​	​	(In thousands)
Research and development	​	$	17,442	​	$	11,948	​	$	8,082
General and administrative	​	​	16,800	​	​	11,942	​	​	7,529
Total stock-based compensation expense	​	$	34,242	​	$	23,890	​	$	15,611

Schedule of assumptions used for the fair value of employee stock options granted

​

​	​	​	​	​	​	​
​		2024		2023		2022
Expected stock price volatility	​	82 -93%	​	92%	​	90 - 97%
Expected option term	​	6.0 Years	​	6.0 Years	​	6.0 Years
Risk-free interest rate	​	3.5 - 4.5%	​	3.5 - 4.7%	​	1.7 - 4.2%
Expected dividend yield	​	None	​	None	​	None

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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