Stockholders' Equity

6 Months Ended

Jun. 30, 2025

Equity [Abstract]

Stockholders' Equity

8. Stockholders' Equity

Common Stock

As of June 30, 2025 and December 31, 2024, common stock reserved for future issuance was as follows:

	June 30,		December 31,
	2025		2024
Outstanding stock option awards		9,938,939		7,595,922
Unvested restricted stock units awards		1,248,529		549,001
Shares available for future grants under the 2024 Equity Incentive Plan and 2024 Inducement Equity Incentive Plan		3,000,428		3,562,709
Shares available for future grants under the Employee Stock Purchase Plan		844,000		422,000
Total shares reserved for future issuance		15,031,896		12,129,632

Early Exercise of Options for a Promissory Note

In December 2022, the Company’s former chief executive officer (the “Former CEO”), a then-related party, early exercised options for 349,321 shares of common stock in exchange for a partial recourse promissory note receivable with the principal amount of $1.1 million. The note bore interest at 4.27% per annum and was to be due in December 2027. For accounting purposes, the promissory note was determined to be non-recourse and, as such, the issuance of the promissory note and subsequent early exercise of stock options were considered not substantive. While the issued shares were not considered outstanding for accounting purposes, they were legally issued and had voting and dividend rights. The shares were included in common stock on the statement of redeemable convertible preferred stock and stockholders’ deficit as of December 31, 2023.

On January 12, 2024, the Company and the Former CEO entered into a note forgiveness letter, pursuant to which the promissory note and all accrued interest thereon in an aggregate amount of $1.1 million were forgiven. As the shares subject to the options that were early exercised were vested as of the date of the forgiveness of the note, these are included in the calculation of net loss per share attributable to common stockholders from the date of the note’s forgiveness. The Company concluded that the note forgiveness was effectively a repricing of options and is a modification. Therefore, the incremental stock-based compensation expense was recognized for the vested shares at the modification date (see Note 9).

Shelf Registration Statement

On March 27, 2025, the Company filed a shelf registration statement on Form S-3 (the “Registration Statement”), covering the offer and sale from time to time of up to $250.0 million in aggregate offering price of shares of its common stock, shares of its preferred stock, debt securities, warrants, rights, units and/or depositary shares. The Registration Statement was declared effective by the SEC on April 15, 2025. The terms of any offering under the Registration Statement will be established at the time of such offering and will be described in a prospectus supplement to the Registration Statement filed with the SEC prior to the completion of any such offering. The Registration Statement included a sales agreement prospectus (the “ATM Prospectus”), covering the offer and sale from time to time through or to Jefferies, LLC (“Jefferies”), as sales agent, of up to $50.0 million in aggregate offering price of shares of the Company’s common stock under an Open Market Sale AgreementSM entered into with Jefferies on March 27, 2025. As of June 30, 2025, $50.0 million remains allocated and available under the ATM Prospectus and $200.0 million remains available and unallocated under the Registration Statement.

Initial Public Offering

On February 7, 2024, the Company’s Registration Statement on Form S-1 for its IPO was declared effective, and on February 12, 2024, the Company closed the IPO and issued 16,675,000 shares of common stock at a price to the public of $22.00 per share, including 2,175,000 shares issued upon the exercise of underwriters’ option to purchase additional shares of common stock. The Company received gross proceeds of $366.9 million. Net proceeds were $336.2 million, after deducting underwriting commissions and other offering costs totaling $30.7 million. On February 8, 2024, the Company’s common stock began trading on the Nasdaq Global Select Market under the symbol “KYTX”. Immediately prior to the IPO closing, all of the outstanding shares of the Company’s redeemable convertible preferred stock converted into shares of the Company’s common stock on a 1-for-4.5511 basis.