Churchill Capital Corp IX/Cayman Watch

from 8-K 2 pages Churchill Capital Corp IX 640 Fifth Avenue, 14th Floor New York, Ny 10019 May 1, 2024

from 8-K 6 pages May 1, 2024 Churchill Capital Corp IX 640 Fifth Avenue, 14th Floor New York, Ny 10019 Re: Initial Public Offering Ladies and Gentlemen

from 8-K 7 pages Private Placement Units Purchase Agreement

from 8-K 13 pages Registration Rights Agreement

from 8-K 14 pages Investment Management Trust Agreement

from S-1 3 pages Churchill Capital Corp IX 640 Fifth Avenue, 14th Floor New York, Ny 10019 [_], 2024

from S-1 14 pages Indemnification Agreement

from S-1 8 pages Private Placement Units Purchase Agreement

from S-1 9 pages Churchill Capital Corp IX, a Cayman Islands Exempted Company (The “Company”), Is Pleased to Accept the Offer Churchill Sponsor IX LLC, a Delaware Limited Liability Company, (The “Subscriber” or “You”) Has Made to Subscribe for 7,187,500 Class B Ordinary Shares of the Company (The “Shares”), $0.0001 Par Value Per Share (The “Class B Ordinary Shares”), Up to 937,500 of Which Are Subject to Complete or Partial Forfeiture by You if the Underwriters of the Company’s Initial Public Offering (“Ipo”) of Units (“Units”) Do Not Fully Exercise Their Over-Allotment Option (The “Over-Allotment Option”). for the Purposes of This Agreement, References to “Ordinary Shares” Are To, Collectively, the Class B Ordinary Shares and the Company’s Class a Ordinary Shares, $0.0001 Par Value Per Share (The “Class a Ordinary Shares”). Pursuant to the Company’s Memorandum and Articles of Association (As May Be Amended, the “Articles”), Unless Otherwise Provided in the Definitive Agreement for the Company’s Initial Business Combination, Class B Ordinary Shares Will Convert Into Class a Ordinary Shares on a One-For-One Basis, Subject to Adjustment, Upon the Terms and Conditions Set Forth in the Articles. Unless the Context Otherwise Requires, as Used Herein “Shares” Shall Be Deemed to Include Any Class a Ordinary Shares Issued Upon Conversion of the Class B Ordinary Shares Comprising the Shares. the Terms (This “Agreement”) on Which the Company Is Willing to Issue the Shares to the Subscriber, and the Company and the Subscriber’s Agreements Regarding Such Shares, Are as Follows: 1. Subscription for Shares

from S-1 19 pages Registration Rights Agreement

from S-1 15 pages Investment Management Trust Agreement

from S-1 8 pages [•], 2024 Churchill Capital Corp IX 640 Fifth Avenue, 14th Floor New York, Ny 10019 Re: Initial Public Offering Ladies and Gentlemen

from S-1 4 pages Promissory Note

from DRS/A 8 pages Private Placement Units Purchase Agreement

from DRS/A 15 pages Investment Management Trust Agreement

from DRS 3 pages Churchill Capital Corp IX 640 Fifth Avenue, 14th Floor New York, Ny 10019 [_], 2024

from DRS 14 pages Indemnification Agreement

from DRS 9 pages Churchill Capital Corp IX, a Cayman Islands Exempted Company (The “Company”), Is Pleased to Accept the Offer Churchill Sponsor IX LLC, a Delaware Limited Liability Company, (The “Subscriber” or “You”) Has Made to Subscribe for 7,187,500 Class B Ordinary Shares of the Company (The “Shares”), $0.0001 Par Value Per Share (The “Class B Ordinary Shares”), Up to 937,500 of Which Are Subject to Complete or Partial Forfeiture by You if the Underwriters of the Company’s Initial Public Offering (“Ipo”) of Units (“Units”) Do Not Fully Exercise Their Over-Allotment Option (The “Over-Allotment Option”). for the Purposes of This Agreement, References to “Ordinary Shares” Are To, Collectively, the Class B Ordinary Shares and the Company’s Class a Ordinary Shares, $0.0001 Par Value Per Share (The “Class a Ordinary Shares”). Pursuant to the Company’s Memorandum and Articles of Association (As May Be Amended, the “Articles”), Unless Otherwise Provided in the Definitive Agreement for the Company’s Initial Business Combination, Class B Ordinary Shares Will Convert Into Class a Ordinary Shares on a One-For-One Basis, Subject to Adjustment, Upon the Terms and Conditions Set Forth in the Articles. Unless the Context Otherwise Requires, as Used Herein “Shares” Shall Be Deemed to Include Any Class a Ordinary Shares Issued Upon Conversion of the Class B Ordinary Shares Comprising the Shares. the Terms (This “Agreement”) on Which the Company Is Willing to Issue the Shares to the Subscriber, and the Company and the Subscriber’s Agreements Regarding Such Shares, Are as Follows: 1. Subscription for Shares

from DRS 15 pages Investment Management Trust Agreement

from DRS 8 pages [•], 2024 Churchill Capital Corp IX 640 Fifth Avenue, 14th Floor New York, Ny 10019 Re: Initial Public Offering Ladies and Gentlemen