Exhibit 10.6

99 ACQUISITION GROUP INC.

14 Noblewood Ct,

Gaithersburg, MD 20878

August 17, 2023

Ladies and Gentlemen:

This letter will confirm our agreement that, commencing on the effective date (the “Effective Date”) of the registration statement (the “Registration Statement”) for the initial public offering (the “IPO”) of the securities of 99 Acquisition Group Inc. (the “Company”) and continuing until the earlier of (i) the consummation by the Company of an initial business combination or (ii) the Company’s liquidation (in each case as described in the Registration Statement) (such earlier date hereinafter referred to as the “Termination Date”), 99 Acquisition Sponsor LLC (the “Sponsor”) shall make available to the Company certain office space, secretarial and administrative services as may be required by the Company from time to time, situated at 214 Noblewood Ct, Gaithersburg, MD 20878 (or any successor location). In exchange therefore, the Company shall pay the Sponsor a sum not to exceed $10,000 per month, respectively, on the Effective Date and continuing monthly thereafter until the Termination Date. The Sponsor hereby agrees that it does not have any right, title, interest or claim of any kind in or to any monies that may be set aside in a trust account (the “Trust Account”) that may be established by the Company for the benefit of the Company’s public stockholders upon the consummation of the IPO as described in the Registration Statement (“Claim”), and hereby waives any Claim it may have in the future as a result of, or arising out of, any negotiations, contracts or agreements with the Company, and will not seek recourse against the Trust Account for any reason whatsoever.

[Signature Page to Administrative Services Agreement]