PlusAI and T2 team on Level 4 trucks in Japan amid CCIX merger plan

Rhea-AI Filing Summary

Churchill Capital Corp IX highlights a new strategic partnership between PlusAI and Tokyo-based T2 Inc. to deploy Level 4 autonomous trucks in Japan. The collaboration combines T2’s logistics and technology expertise in Japan with PlusAI’s experience running commercial autonomous trucking programs with major global truck makers in the U.S. and Europe.

Mitsui & Co. has made an investment in PlusAI in support of this partnership, underscoring its interest in next-generation mobility and Japan’s logistics infrastructure. The communication also reminds shareholders that PlusAI plans to go public via a business combination with Churchill Capital Corp IX, for which a registration statement is effective and proxy materials are being mailed for a shareholder vote.

Filed by Churchill Capital Corp IX pursuant to Rule 425

under the Securities Act of 1933, as amended,

and deemed filed pursuant to Rule 14a-12

under the Securities Exchange Act of 1934, as amended

Subject Company: Churchill Capital Corp IX (File No. 001-42041)

On January 14, 2026, Plus Automation, Inc. issued the below press release announcing its strategic partnership with T2.

T2 and PlusAI Team Up to Accelerate the Deployment of Level 4

Autonomous Trucks in Japan

• Building on Mitsui & Co., Ltd.’s investment in PlusAI and T2’s autonomous trucking experience in Japan, the partnership paves the way for next-generation hub-to-hub autonomous freight

• Autonomous trucks address the critical driver shortage in Japan, helping to improve safety, operational efficiency, productivity and sustainability of the country’s logistics system

TOKYO and SANTA CLARA, Calif. — January 15, 2026 — PlusAI and Tokyo-based T2 Inc. announced today a strategic partnership to bring Level 4 autonomous trucks to Japan. This announcement comes as PlusAI is also planning to become publicly listed via a business combination with Churchill Capital Corp IX (Nasdaq: CCIX).

The collaboration combines T2’s deep penetration on technology design and logistics operation in Japan with PlusAI’s proven experience in commercial deployment of autonomous trucks with global truck makers TRATON GROUP, Iveco Group, and Hyundai in the U.S. and Europe. By combining these complementary strengths, the companies will work toward introducing Level 4 autonomous trucking solutions tailored to Japan’s needs.

In support of this partnership with T2, Mitsui & Co. has made an investment in PlusAI, reflecting Mitsui’s long-term commitment to advancing next-generation mobility and strengthening Japan’s logistics infrastructure.

“Backed by Mitsui, this partnership is about bringing the right capabilities together for Japan,” said David Liu, CEO and Co-Founder of PlusAI. “T2 understands the unique requirements of Japan’s freight ecosystem, and PlusAI brings experience from commercial programs overseas. Together, we are taking an important step toward making autonomous trucking a reality in Japan.”

“T2 is focused on supporting Japan’s logistics by applying autonomous driving technology,” said Mr. Masatomo Kumabe, CEO of T2. “Working with PlusAI, a company with demonstrated global expertise in autonomous trucking, positions us to accelerate the path toward safer, more efficient, more productive freight services in Japan.”

Japan faces persistent driver shortages and rising freight demand. Autonomous trucking represents a critical opportunity to enhance safety, reliability, and productivity across the nation’s logistics network. Through this partnership, PlusAI and T2 seek to support Japan’s transition toward a more resilient and AI-enabled freight system.

About T2

T2 Inc. is supported by over 20 leading companies from various industries dedicated to transforming transportation in Japan via autonomous driving. Having pioneered Japan’s first commercial Level 2 autonomous trunk line operations in July 2025, T2 is now accelerating its mission to implement Level 4 autonomous trucking.

Website: https://t2.auto/en

About PlusAI PlusAI is an artificial intelligence company pioneering AI-based virtual driver software for factory-built autonomous trucks. Headquartered in Silicon Valley with operations in the United States and Europe, PlusAI was named by Fast Company as one of the World’s Most Innovative Companies. Partners including TRATON GROUP’s Scania, MAN, and International brands, Hyundai Motor Company, Iveco Group, NVIDIA, Bosch, DSV, and Goodyear are working with PlusAI to accelerate the deployment of next-generation autonomous trucks. PlusAI announced in June 2025 that it plans to go public via a merger with Churchill Capital Corp IX (Nasdaq: CCIX). For more information, visit or follow PlusAI on LinkedIn, X and YouTube.

Additional Information About the Proposed Transaction and Where to Find It

The proposed transaction will be submitted to shareholders of Churchill IX for their consideration. Churchill IX has filed the Registration Statement with the SEC, which includes a proxy statement/prospectus to be distributed to Churchill IX’s shareholders in connection with Churchill IX’s solicitation of proxies for the vote by Churchill IX’s shareholders in connection with the proposed transaction and other matters described in the Registration Statement, as well as the prospectus relating to the offer of the securities to be issued to PlusAI stockholders in connection with the completion of the proposed transaction. The Registration Statement has been declared effective by the SEC and Churchill IX is mailing a proxy statement/prospectus and other relevant documents to its shareholders as of the record date established for voting on the proposed transaction. Before making any voting or investment decision, Churchill IX shareholders, PlusAI stockholders and other interested persons are advised to read the proxy statement/ prospectus, as well as other documents filed with the SEC by Churchill IX in connection with the proposed transaction, as these documents will contain important information about Churchill IX, PlusAI and the proposed transaction. Shareholders may obtain a copy of the proxy statement statement/prospectus, as well as other documents filed by Churchill IX with the SEC, without charge, at the SEC’s website located at www.sec.gov or by directing a written request to Churchill Capital Corp IX, 640 Fifth Avenue, 12th Floor, New York, NY 10019.

Forward-Looking Statements

This press release includes “forward-looking statements” within the meaning of the federal securities laws. Forward-looking statements may be identified by the use of words such as “plan,” “project,” “will,” “estimate,” “intend,” “expect,” “believe,” “target,” “continue,” “could,” “may,” “might,” “possible,” “potential,” “predict”, “accelerate” or similar expressions that predict or indicate future events or trends or that are not statements of historical matters. We have based these forward-looking statements on current expectations and projections about future events. These statements include: expectations regarding the completion of the business combination between PlusAI and Churchill IX; estimates of customer adoption rates and usage patterns; projections regarding the value and capabilities of autonomous driving solutions; projections of development and commercialization timelines; expectations regarding PlusAI’s ability to execute its business model; expectations regarding safety and system maturity of SuperDrive; PlusAI’s deployment of virtual driver software; PlusAI’s expectations concerning relationships with strategic partners, suppliers, governments, regulatory bodies and other third parties; future ventures or investments in companies, products, services, or technologies; the potential benefits of the proposed transaction and expectations related to its terms and timing; and the potential for PlusAI to increase in value. These forward-looking statements are provided for illustrative purposes only and are not intended to serve as, and must not be relied on as, a guarantee, an assurance, a prediction or a definitive statement of fact or probability. Actual events and circumstances are difficult or impossible to predict and will differ from assumptions, many of which are beyond the control of PlusAI and Churchill IX.

These forward-looking statements are subject to known and unknown risks, uncertainties and assumptions that may cause our actual results, levels of activity, performance or achievements to be materially different from any future results, levels of activity, performance or achievements expressed or implied by such statements. Such risks and uncertainties include: that PlusAI is pursuing an emerging technology, faces significant technical challenges and may not achieve commercialization or market acceptance; PlusAI’s historical net losses and limited operating history; PlusAI’s expectations regarding future financial performance, capital requirements and unit economics; PlusAI’s use and reporting of business and operational metrics; PlusAI’s competitive landscape; PlusAI’s dependence on members of its senior management and its ability to attract and retain qualified personnel; the capital requirements of PlusAI’s business plans and the potential need for additional future financing; PlusAI’s ability to manage growth and expand its operations; potential future acquisitions or investments in companies, products, services or technologies; PlusAI’s reliance on strategic partners and other third parties; PlusAI’s ability to maintain, protect and defend its intellectual property rights; risks associated with privacy, data protection or cybersecurity incidents and related regulations; the use and regulation of artificial intelligence and machine learning; uncertainty or changes with respect to laws and regulations; uncertainty or changes with respect to taxes, trade conditions and the macroeconomic environment; the combined company’s ability to maintain internal control over financial reporting and operate a public company; the possibility that required regulatory

approvals for the proposed transaction are delayed or are not obtained, which could adversely affect the combined company or the expected benefits of the proposed transaction; the risk that shareholders of Churchill IX could elect to have their shares redeemed, leaving the combined company with insufficient cash to execute its business plans; the occurrence of any event, change, or other circumstance that could give rise to the termination of the business combination agreement; the outcome of any legal proceedings or government investigations that may be commenced against PlusAI or Churchill IX; failure to realize the anticipated benefits of the proposed transaction; the ability of Churchill IX or the combined company to issue equity or equity-linked securities in connection with the proposed transaction or in the future; and other factors described in Churchill IX’s filings with the SEC. Additional information concerning these and other factors that may impact such forward-looking statements can be found in filings and potential filings by PlusAI, Churchill IX or the combined company resulting from the proposed transaction with the SEC, including under the heading “Risk Factors.” If any of these risks materialize or assumptions prove incorrect, actual results could differ materially from the results implied by these forward-looking statements. In addition, these statements reflect the expectations, plans and forecasts of PlusAI’s and Churchill IX’s management as of the date of this communication; subsequent events and developments may cause their assessments to change. While PlusAI and Churchill IX may elect to update these forward-looking statements at some point in the future, they specifically disclaim any obligation to do so. Accordingly, undue reliance should not be placed upon these statements.

In addition, statements that “we believe” and similar statements reflect our beliefs and opinions on the relevant subject. These statements are based upon information available to us as of the date of this communication, and while we believe such information forms a reasonable basis for such statements, such information may be limited or incomplete, and our statements should not be read to indicate that we have conducted an exhaustive inquiry into, or review of, all potentially available relevant information. These statements are inherently uncertain and investors are cautioned not to unduly rely upon these statements. An investment in Churchill IX is not an investment in any of our founders’ or sponsors’ past investments, companies or affiliated funds. The historical results of those investments are not indicative of future performance of Churchill IX, which may differ materially from the performance of our founders’ or sponsors’ past investments.

Participants in the Solicitation

Churchill IX, PlusAI and certain of their respective directors, executive officers and other members of management and employees may, under SEC rules, be deemed to be participants in the solicitation of proxies from Churchill IX’s shareholders in connection with the proposed transaction. Information regarding the persons who may, under SEC rules, be deemed participants in the solicitation of Churchill IX’s shareholders in connection with the proposed transaction are set forth in proxy statement/prospectus filed by Churchill IX with the SEC. You can find more information about Churchill IX’s directors and executive officers

in Churchill IX’s final prospectus related to its initial public offering filed with the SEC on May 1, 2024 and in the Annual Reports on Form 10-K filed by Churchill IX with the SEC. Additional information regarding the participants in the proxy solicitation and a description of their direct and indirect interests is included in the proxy statement/prospectus. Shareholders, potential investors and other interested persons should read the proxy statement/prospectus carefully before making any voting or investment decisions. You may obtain free copies of these documents from the sources described above.

No Offer or Solicitation

This communication does not constitute an offer to sell or the solicitation of an offer to buy any securities, or a solicitation of any vote or approval, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. This communication is not, and under no circumstances is to be construed as, a prospectus, an advertisement or a public offering of the securities described herein in the United States or any other jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended, or exemptions therefrom. INVESTMENT IN ANY SECURITIES DESCRIBED HEREIN HAS NOT BEEN APPROVED BY THE SEC OR ANY OTHER REGULATORY AUTHORITY NOR HAS ANY AUTHORITY PASSED UPON OR ENDORSED THE MERITS OF THE OFFERING OR THE ACCURACY OR ADEQUACY OF THE INFORMATION CONTAINED HEREIN. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

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Media Contacts

PlusAI: Lauren Kwan, pr@plus.ai

T2: Hiroshi Iwai, pr@t2.auto

FAQ

What did Churchill Capital Corp IX (CCIX) disclose in this communication?

It relays that PlusAI and T2 Inc. formed a strategic partnership to bring Level 4 autonomous trucking solutions to Japan and notes the ongoing proposed business combination between PlusAI and Churchill Capital Corp IX.

What is the focus of the PlusAI and T2 partnership mentioned for CCIX investors?

The partnership aims to deploy Level 4 autonomous trucks in Japan by combining T2’s logistics and technology expertise with PlusAI’s commercial autonomous trucking experience with partners such as TRATON GROUP, Iveco Group, and Hyundai.

How is Mitsui & Co. involved with PlusAI in this filing related to CCIX?

Mitsui & Co. has made an investment in PlusAI in support of its partnership with T2, reflecting Mitsui’s long-term commitment to next-generation mobility and Japan’s logistics infrastructure.

What does this document say about PlusAI’s plans to go public with Churchill Capital Corp IX (CCIX)?

It states that PlusAI plans to become publicly listed via a business combination with Churchill Capital Corp IX, and that a registration statement including a proxy statement/prospectus has been declared effective, with proxy materials being mailed to Churchill IX shareholders.

Where can Churchill Capital Corp IX (CCIX) shareholders find the proxy statement/prospectus?

Shareholders can access the proxy statement/prospectus and related documents for free on www.sec.gov or by written request to Churchill Capital Corp IX, 640 Fifth Avenue, 12th Floor, New York, NY 10019.

Does this communication constitute an offer to sell securities of Churchill Capital Corp IX (CCIX) or PlusAI?

No. The communication explicitly states that it is not an offer to sell or a solicitation of an offer to buy any securities, and that any offer will only be made by means of a prospectus meeting legal requirements or applicable exemptions.

What forward-looking risks are highlighted regarding the PlusAI–CCIX business combination?

It notes risks such as PlusAI’s emerging technology and commercialization challenges, historical net losses, capital needs, reliance on partners and key personnel, regulatory and macroeconomic uncertainty, potential shareholder redemptions at Churchill IX, possible failure to obtain approvals, and the risk that anticipated benefits of the proposed transaction may not be realized.