Highbridge reveals 8.8% stake in JAB Acquisition Corp I (JAB)

Rhea-AI Filing Summary

Highbridge Capital Management, LLC, a Delaware investment adviser, reports beneficial ownership of 1,638,750 Class A ordinary shares of JAB Acquisition Corp I. This represents 8.8% of the 18,605,000 Class A ordinary shares outstanding, based on the issuer’s prospectus and subsequent report after the offering and related transactions.

Highbridge has sole voting and dispositive power over these shares and no shared power. The shares are directly held by funds and accounts it advises, including Highbridge Tactical Credit Master Fund, L.P., which has rights to dividends or sale proceeds on more than 5% of the outstanding Class A ordinary shares. Highbridge states the report should not be construed as an admission of beneficial ownership for all legal purposes.

Key Figures

Shares beneficially owned: 1,638,750 Class A ordinary shares Ownership percentage: 8.8% Shares outstanding baseline: 18,605,000 Class A ordinary shares +2 more

5 metrics

Shares beneficially owned 1,638,750 Class A ordinary shares Reported by Highbridge Capital Management, LLC as of the ownership report

Ownership percentage 8.8% Portion of JAB Acquisition Corp I Class A ordinary shares beneficially owned by Highbridge

Shares outstanding baseline 18,605,000 Class A ordinary shares Outstanding after offering, private placement, full over-allotment and director issuances

Sole voting power 1,638,750 shares Shares over which Highbridge has sole power to vote or direct the vote

Sole dispositive power 1,638,750 shares Shares over which Highbridge has sole power to dispose or direct disposition

Key Terms

beneficial owner, sole voting power, sole dispositive power, over-allotment option, +1 more

5 terms

beneficial owner regulatory

"should not be construed as an admission that any of the foregoing persons or the Reporting Person is, for the purposes of Section 13 of the Securities Exchange Act of 1934, the beneficial owner"

A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.

sole voting power regulatory

"Sole Voting Power 1,638,750.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

sole dispositive power regulatory

"Sole Dispositive Power 1,638,750.00"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

over-allotment option financial

"after giving effect to the completion of the offering, the consummation of the simultaneous private placement, the full exercise of the underwriters' over-allotment option"

An over-allotment option is a special agreement that allows underwriters to sell more shares than initially planned if demand is high. Think of it like a retailer offering extra units of a popular product to meet additional customer interest. This option helps ensure the full sale is completed and can also give investors extra shares if they want more.

investment adviser financial

"a Delaware limited liability company and the investment adviser to certain funds and accounts"

An investment adviser is a person or firm that professionally manages money and gives recommendations about buying, selling, or holding investments. Like a financial coach or guide, they have a legal duty to act in a client's best financial interest, so their advice, fees and potential conflicts can directly affect returns and risk — making their role important for investors who want informed, accountable help with portfolios.

FAQ

What percentage of JAB Acquisition Corp I (JAB) shares does Highbridge own?

Highbridge Capital Management, LLC reports beneficial ownership of 8.8% of JAB Acquisition Corp I’s Class A ordinary shares, based on 18,605,000 shares outstanding after the offering and related transactions described by the issuer.

How many JAB Acquisition Corp I (JAB) shares does Highbridge control?

Highbridge reports beneficial ownership and sole voting and dispositive power over 1,638,750 Class A ordinary shares of JAB Acquisition Corp I, held through funds and accounts it advises, including Highbridge Tactical Credit Master Fund, L.P.

What is the total JAB Acquisition Corp I (JAB) share count used for Highbridge’s 8.8%?

The 8.8% ownership is calculated using 18,605,000 Class A ordinary shares outstanding, as reported after completion of the offering, private placement, full over-allotment exercise, and issuance to independent directors.

Does Highbridge share voting or dispositive power over JAB (JAB) shares?

Highbridge reports sole voting power and sole dispositive power over 1,638,750 JAB Acquisition Corp I Class A ordinary shares and indicates no shared voting or dispositive power with other parties.

Which Highbridge fund holds more than 5% of JAB Acquisition Corp I (JAB)?

Highbridge states that Highbridge Tactical Credit Master Fund, L.P. has the right to receive or direct dividends or sale proceeds from more than 5% of JAB Acquisition Corp I’s outstanding Class A ordinary shares.

Where is Highbridge Capital Management, LLC, the JAB (JAB) shareholder, based?

Highbridge Capital Management, LLC is a Delaware limited liability company with its principal business office at 390 Madison Avenue, 28th Floor, New York, NY 10017, acting as investment adviser to the Highbridge Funds.

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Available on EDGAR 08/14/2026 - 12:31 PM Accepted by SEC EDGAR 08/14/2026 - 12:31 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

JAB Acquisition Corp I

(Name of Issuer)

Class A Ordinary Shares, par value $0.0001 per share

(Title of Class of Securities)

G50004129

(CUSIP Number)

06/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): G50004129

1

Names of Reporting Persons

Highbridge Capital Management, LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 1,638,750.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,638,750.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,638,750.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

8.8 %

12

Type of Reporting Person (See Instructions)

IA, OO

SCHEDULE 13G

Item 1.
(a)	Name of issuer: JAB Acquisition Corp I
(b)	Address of issuer's principal executive offices: 270 Sylvan Avenue, Suite 2230, Englewood Cliffs, NJ, 07632
Item 2.
(a)	Name of person filing: This statement is filed by Highbridge Capital Management, LLC ("Highbridge" or the "Reporting Person"), a Delaware limited liability company and the investment adviser to certain funds and accounts (the "Highbridge Funds"), with respect to the Class A ordinary shares, par value $0.0001 per share ("Class A Ordinary Shares"), of JAB Acquisition Corp I, a Cayman Islands exempted company (the "Issuer"), directly held by the Highbridge Funds; The filing of this statement should not be construed as an admission that any of the foregoing persons or the Reporting Person is, for the purposes of Section 13 of the Securities Exchange Act of 1934, the beneficial owner of the securities reported herein. The Class A Ordinary Shares have no CUSIP number. The CUSIP number for the units which include the Class A Ordinary Shares is G50004129.
(b)	Address or principal business office or, if none, residence: The address of the business office of the Reporting Person is 390 Madison Avenue, 28th Floor, New York, NY 10017.
(c)	Citizenship: Highbridge is a Delaware limited liability company.
(d)	Title of class of securities: Class A Ordinary Shares, par value $0.0001 per share
(e)	CUSIP Number(s): G50004129
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: The information required by Item 4(a) is set forth in Row 9 of the cover page for the Reporting Person and is incorporated herein by reference. The percentage set forth in this Schedule 13G is calculated based upon an aggregate of 18,605,000 Class A Ordinary Shares outstanding, as reported in the Issuer's Prospectus filed pursuant to Rule 424(b)(4) with the Securities and Exchange Commission on June 10, 2026 and the Issuer's Current Report on Form 8-K filed with the Securities and Exchange Commission on June 17, 2026, after giving effect to the completion of the offering, the consummation of the simultaneous private placement, the full exercise of the underwriters' over-allotment option and the issuance of 95,000 Class A Ordinary Shares to the Issuer's three independent directors, all as described therein.
(b)	Percent of class: 8.8%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: The information required by Item 4(c)(i) is set forth in Row 5 of the cover page for the Reporting Person and is incorporated herein by reference.
	(ii) Shared power to vote or to direct the vote: The information required by Item 4(c)(ii) is set forth in Row 6 of the cover page for the Reporting Person and is incorporated herein by reference.
	(iii) Sole power to dispose or to direct the disposition of: The information required by Item 4(c)(iii) is set forth in Row 7 of the cover page for the Reporting Person and is incorporated herein by reference.
	(iv) Shared power to dispose or to direct the disposition of: The information required by Item 4(c)(iv) is set forth in Row 8 of the cover page for the Reporting Person and is incorporated herein by reference.
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. See Item 2(a). The Highbridge Funds have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the Class A Ordinary Shares reported herein. Highbridge Tactical Credit Master Fund, L.P., a Highbridge Fund, has the right to receive or the power to direct the receipt of dividends or the proceeds from the sale of more than 5% of the outstanding Class A Ordinary Shares.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Highbridge Capital Management, LLC

Signature:	/s/ Kirk Rule
Name/Title:	By: Kirk Rule, Executive Director
Date:	08/14/2026