Amendment to Forward Purchase Agreement, dated as of January 19, 2024, among NKGen and Sandia Investment Management LP on behalf of the investors thereto

Subject to Counterparty receiving a Pricing Date Notice, Counterparty will pay the Prepayment Amount by bank wire in immediately available funds to an account designated by Seller from (subject to the below exception) the Counterparty’s Trust Account maintained by Continental Stock Transfer and Trust Company holding the net proceeds (less any amounts previously redeemed) of the sale of the units in Counterparty’s initial public offering and the sale of private placement warrants (the “Trust Account”), no later than the earlier of (a) one Local Business Day after the Closing Date and (b) the date any assets from the Trust Account are disbursed in connection with the Business Combination; except that to the extent that the Prepayment Amount is to be paid from the purchase of Additional Shares by Seller, such amount will be netted against such proceeds, with Seller being able to reduce the purchase price for the Additional Shares by the Prepayment Amount.

Counterparty shall provide notice to (i) Counterparty’s trustee of the entrance into this Confirmation no later than one Local Business Day following the date hereof, with copy to Seller and Seller’s outside legal counsel, and (ii) Seller and Seller’s outside legal counsel of the Closing Date at least one Local Business Day before the Closing Date, and a final draft of the flow of funds from the Trust Account one Local Business Day prior to the closing of the Business Combination itemizing the Prepayment Amount due to Seller; provided that Seller shall be invited and permitted to attend any closing call in connection with the Business Combination. The Prepayment Amount shall be paid directly to Seller.

From time to time and on any date following the Trade Date (any such date, a “Shortfall Sale Date”) and subject to the terms and conditions below, Seller may, in its absolute discretion, sell Shortfall Sale Shares, and in connection with such sales, Seller shall provide written notice to Counterparty (the “Shortfall Sale Notice”) no later than the later of (a) the fifth Local Business Day following the Shortfall Sales Date and (b) the first Payment Date after the Shortfall Sales Date, specifying the quantity of the Shortfall Sale Shares and the allocation of the Shortfall Sale Proceeds. Seller shall not have any Early Termination Obligation in connection with any Shortfall Sales. The Counterparty covenants and agrees for a period of at least sixty Local Business Days (commencing on the Prepayment Date or if an earlier Registration Request is submitted by Seller on the Registration Statement Effective Date) not to issue, sell or offer or agree to sell more than $30 million of Shares, or securities or debt that is convertible, exercisable or exchangeable into Shares, including under any existing or future equity line of credit, until the Shortfall Sales equal the Prepayment Shortfall, without the Seller’s consent; provided, however, that nothing in the foregoing covenant shall prohibit (i) the grant, issuance or exercise of employee stock options or other equity awards under the Counterparty’s equity compensation plans, (ii) the issuance of any securities issued or assumed in connection with the Business Combination including other forward purchase agreements, or (iii) repricing of Counterparty’s warrants.

Unless and until the proceeds from Shortfall Sales equal 100% of the Initial Shortfall and 120% of the Future Shortfall, in the event that the product of (x) the difference between (i) the number of Shares as specified in the Pricing Date Notice(s), less (ii) any Shortfall Sale Shares as of such measurement time, multiplied by (y) the VWAP Price, is less than (z) the difference between (i) the Prepayment Shortfall, less (ii) the proceeds from Shortfall Sales as of such measurement time (the “Shortfall Variance”), then the Counterparty, as liquidated damages in respect of such Shortfall Variance, at its option shall within five (5) Local Business Days either:

(A) Pay in cash an amount equal to the Shortfall Variance; or

(B) Issue and deliver to Seller such number of additional Shares that are equal to (1) the Shortfall Variance, divided by (2) 90% of the VWAP Price (the “Shortfall Variance Shares”)

In the event that the Counterparty issues and delivers to Seller Shortfall Variance Shares, within thirty calendar days of such issuance and delivery, Counterparty shall use its commercially reasonable efforts to file (at Counterparty’s sole cost and expense) with the U.S. Securities and Exchange Commission (the “Commission”) a registration statement registering the resale of all shares held by the Seller, including the Recycled Shares (the “Shortfall Variance Registration Statement”), provided, that, the Counterparty’s obligations to file such Shortfall Variance Registration Statement shall be contingent upon Seller furnishing in writing to the Counterparty a completed selling stockholder questionnaire in customary form that contains such information regarding Seller, the securities of the Counterparty held by Seller and the intended method of disposition of the shares as shall be reasonably requested by the Counterparty to effect the registration of the shares, and shall use its commercially reasonable efforts to have the Shortfall Variance Registration Statement declared effective as soon as practicable after the filing thereof, but no later than the earliest of (i) the 90th calendar day (or 120th calendar day if the Commission notifies the Counterparty that it will “review” the Shortfall Variance Registration Statement) following the issuance and delivery of the Shortfall Variance Shares and (ii) the 10th Local Business Day after the date the Counterparty is notified (orally or in writing, whichever is earlier) by the Commission that such Shortfall Variance Registration Statement will not be “reviewed” or will not be subject to further review. Upon notification by the Commission that the Shortfall Variance Registration Statement has been declared effective by the Commission, within two Local Business Days thereafter, the Counterparty shall file the final prospectus under Rule 424 of the Securities Act of 1933, as amended containing a “plan of distribution” reasonably agreeable to Seller. Counterparty shall not identify Seller as a statutory underwriter in the Registration Statement unless requested by the Commission. The Counterparty will use its commercially reasonable efforts to keep the Shortfall Variance Registration Statement covering the resale of the shares as described above continuously effective (except that the Counterparty shall be entitled to postpone and suspend the effectiveness or use of the Shortfall Variance Registration Statement (i) during any customary blackout or similar period or as permitted hereunder and (ii) as may be necessary in connection with the preparation and filing of a post-effective amendment to the Registration Statement following the filing of the Counterparty’s Annual Report on Form 10-K), until all such Shortfall Variance Shares have been sold or may be transferred without any restrictions, including the requirement for the Counterparty to be in compliance with the current public information required under Rule 144(c)(1) (or Rule 144(i)(2), if applicable) or the volume and manner of sale limitations under Rule 144(e), (f) and (g) under the Securities Act. Seller shall not be entitled to use the Shortfall Variance Registration Statement for an underwritten offering of Shortfall Variance Shares. Notwithstanding anything to the contrary contained herein, the Counterparty may delay or postpone filing of such Shortfall Variance Registration Statement, and from time to time require Seller not to sell under the Shortfall Variance Registration Statement or suspend the use or effectiveness of any such Shortfall Variance Registration Statement if it determines in good faith that in order for the registration statement to not contain a material misstatement or omission, an amendment thereto would be needed, or if such filing or use would reasonably be expected to materially affect a bona fide business or financing transaction of the Counterparty or would reasonably be expected to require premature disclosure of information that would materially adversely affect the Counterparty (each such circumstance, a “Suspension Event”); provided, that, (w) the Counterparty shall not so delay filing or so suspend the use of the Shortfall Variance Registration Statement for a period of more than sixty (60) consecutive days or more than two (2) times in any three hundred sixty (360) day period, and (x) the Counterparty shall use commercially reasonable efforts to make such registration statement available for the sale by Seller of such Shortfall Variance Shares as soon as practicable thereafter. If requested by Seller, the Counterparty shall within five (5) Local Business Days of receipt of such request, subject to receipt of a legal opinion of Counterparty’s counsel, instruct its transfer agent to remove any restrictive legend with respect to transfers under the Securities Act from Shortfall Variance Shares that have been sold pursuant to an effective registration statement or Rule 144 under the Securities Act (subject to all applicable requirements of Rule 144 being met); provided that Seller and its broker shall have timely provided customary representations and other documentation reasonably acceptable to the Counterparty, its counsel and/or its transfer agent in connection therewith. Any fees (with respect to the transfer agent, Counterparty’s counsel or otherwise) associated with the issuance of any legal opinion required by the Counterparty’s transfer agent or the removal of such legend shall be borne by the Counterparty.

Any Shortfall Variance Shares shall constitute Shortfall Shares, and the sale of such Shortfall Variance Shares after the Shortfall Variance Registration Statement is declared effective by the Commission shall be a Shortfall Sale. If the Shortfall Variance has not been paid in cash by the Counterparty, and after the sale of all Shortfall Variance Shares, the proceeds from all Shortfall Sales, including the Shortfall Variance Shares, is less than 100% of the Prepayment Shortfall, then there will be another Shortfall Variance, calculated in accordance with this provision, and the Counterparty shall address such Shortfall Variance as provided for by this provision. This shall continue until such time as the proceeds from all Shortfall Sales equal 100% of the Initial Shortfall and 120% of the Future Shortfall or the Counterparty shall have paid any Shortfall Variance in cash.

With respect to the forgoing and any issuance of Shortfall Variance Shares, the Counterparty shall not issue any Shortfall Variance Shares pursuant to this provision to the extent that after giving effect thereto, the aggregate number of Shares that would be issued pursuant to this provision would exceed 19.99% of the Shares that are issued and outstanding immediately prior to such issuance, which number of shares shall be (i) reduced, on a share-for-share basis, by the number of Shares issued or issuable pursuant to any transaction or series of transactions that may be aggregated with the transactions contemplated hereby under applicable rules of the Nasdaq and (ii) appropriately adjusted for any reorganization, recapitalization, non-cash dividend, stock split or other similar transaction that occurs after the date of this Confirmation (such maximum number of shares, the “Exchange Cap”), unless and until the Counterparty elects to solicit stockholder approval of the issuance of the Shortfall Variance Shares as contemplated hereby, and the stockholders of the Counterparty have in fact approved the issuance of the Shortfall Variance Shares as contemplated hereby in accordance with the applicable rules of the Nasdaq. In the event that there is an Exchange Cap, if the Counterparty does not elect to solicit stockholder approval and obtain such stockholder approval in accordance with the applicable rules of the Nasdaq, then the Counterparty will pay the Shortfall Variance in cash.