JAB Acquisition Corp I

EXTRAORDINARY GENERAL MEETING OF SHAREHOLDERS

This Proxy Statement is furnished in connection with the solicitation of proxies by the Board of Directors (the “Board”) of JAB Acquisition Corp I (the “Company,” “JAB,” “we,” “us,” or “our”) for the extraordinary general meeting (the “General Meeting”) of Shareholders to be held at the Company’s principal executive office, at 270 Sylvan Ave., Suite 2230 Englewood Cliffs, New Jersey 07632 on November 9, 2026 at 9:00 a.m. and for any adjournment or adjournments thereof, for the purposes set forth in the accompanying Notice of General Meeting of Shareholders. The Company will bear the costs of this solicitation.

If your proxy is properly executed and returned prior to the General Meeting, your Class A ordinary shares of par value US$0.0001 each (“Class A ordinary shares”) and Class B ordinary shares of par value US$0.0001 (“Class B ordinary shares” and, together with the Class A ordinary shares, “Ordinary Shares” or “Shares”), each in the capital of the Company, represented thereby will be voted in accordance with the directions thereon and otherwise in accordance with the judgment of the persons designated as proxies. Any proxy card on which no instruction is specified and the Chairman is appointed as proxy will be voted in favor of the proposals. Any shareholder appointing such a proxy has the power to revoke it at any time before it is voted. If you are a holder of record, written notice of such revocation should be forwarded to Continental Stock Transfer & Trust Company. If you hold your Shares in street name, you should contact your broker about revoking your proxy.

The Company will bear the cost of preparing, printing, assembling and mailing the proxy card, Proxy Statement and other material which may be sent to shareholders in connection with this solicitation. It is contemplated that brokerage houses will forward the proxy materials to beneficial owners at our request. In addition to the solicitation of proxies by use of the mails, officers and regular employees of the Company may solicit proxies without additional compensation, by telephone, email, or other forms of electronic communication. We may reimburse brokers or other persons holding Shares in their names or the names of their nominees for the expenses of forwarding soliciting material to their principals and obtaining their proxies.