8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(D)

OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported):February 6, 2026

Jackson Acquisition Company II

(Exact name of registrant as specified in itscharter)

(770) 643-5605

(Registrant’s telephone number, includingarea code)

Check the appropriate box below if the Form 8-K is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 3.01. Notice of Delisting or Failure to Satisfy a ContinuedListing Rule or Standard; Transfer of Listing.

On February 6, 2026, Jackson Acquisition Company II (the “Company”) received a notice (the “Notice”) from the New York Stock Exchange (the “NYSE”) notifying the Company that it is not in compliance with Section 802.01B of the NYSE Listed Company Manual (the “Listing Rule”), which requires an NYSE-listed company to maintain a minimum of 300 public stockholders on a continuous basis.

The Company will, within 45 days from the receipt of the Notice, submit a business plan to the NYSE that demonstrates how the Company expects to return to compliance with the Listing Rule within 18 months of receipt of the Notice. Upon receipt of the plan, the NYSE has 45 days to review and determine if the plan reasonably demonstrates the Company’s ability to regain compliance with the minimum listing standards. The Notice has no immediate impact on the listing or trading of the Company’s securities. So long as the NYSE approves the plan, the Company’s securities will continue to be listed and traded on the NYSE during the 18-month period, subject to the Company’s compliance with other NYSE listing standards and periodic review by the NYSE of the Company’s progress under the plan. If the Company fails to comply with the business plan or the NYSE does not accept the plan, the NYSE may commence suspension and delisting procedures.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits

1

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

2

Exhibit 99.1

Jackson Acquisition Company II Receives NoncomplianceNotice from the New York Stock Exchange Regarding Minimum Public Stockholders

New York, February 10, 2026 — Jackson Acquisition Company II (the “Company”) announced today that it had received written notice on February 6, 2026 (the “Notice”) from the New York Stock Exchange (the “NYSE”) that the Company is not in compliance with Section 802.01B of the NYSE Listed Company Manual (the “Listing Rule”) which requires the Company to maintain a minimum of 300 public stockholders on a continuous basis. In accordance with applicable NYSE procedures, the Company has 45 days from receipt of the Notice to submit a plan that would bring it into compliance with the minimum stockholder requirement within 18 months of receipt of the Notice.

The Company plans to promptly submit a business plan that demonstrates how the Company expects to return to compliance with the Listing Rule within 18 months of receipt of the Notice.

The Notice has no immediate impact on the Company’s securities, and provided the NYSE approves the plan, the Company’s securities will continue to be listed and traded on the NYSE during the 18-month cure period under their existing ticker symbols. Continued listing is subject to the Company’s compliance with other NYSE listing standards and periodic review by the NYSE of the Company’s progress under the plan.

About Jackson Acquisition Company II

Jackson Acquisition Company II is a special purpose acquisition company formed for the purpose of effecting a merger, share exchange, asset acquisition, stock purchase, reorganization or similar business combination with one or more businesses. While the Company may pursue an initial business combination in any industry or geographic location, the Company intends to concentrate its search on businesses with a focus on healthcare services, healthcare technology, or otherwise focused on the healthcare industry.

Forward-Looking Statements

This press release includes “forward-looking statements” within the meaning of the “safe harbor” provisions of the United States Private Securities Litigation Reform Act of 1995, including, without limitation, statements regarding the Company’s intent to submit a plan to bring it into compliance with the NYSE listing standards. When used in this press release, the words “estimates,” “projected,” “expects,” “anticipates,” “forecasts,” “plans,” “intends,” “believes,” “seeks,” “may,” “will,” “should,” “future,” “propose” and variations of these words or similar expressions (or the negative versions of such words or expressions) are intended to identify forward-looking statements. You should carefully consider the risks and uncertainties described in the Risk Factors section of the Company’s registration statement and prospectus for the Company’s initial public offering filed with the SEC, and any subsequent filings. All forward-looking statements are expressly qualified in their entirety by such factors. The Company undertakes no obligation to update these statements for revisions or changes after the date of this release, except as required by law.

Investor Contact:

Richard L. Jackson

Jackson Acquisition Company II

678-690-1079