Form 8-K

8-K — Iris Acquisition Corp II

Accession: 0001185185-26-004972

Filed: 2026-10-23

Period: 2026-10-20

CIK: 0002077785

SIC: 6770 (BLANK CHECKS)

Item: Entry into a Material Definitive Agreement

Item: Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

Item: Financial Statements and Exhibits

Documents

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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

October 20, 2026

Date of Report (Date of earliest event reported)

Iris

Acquisition Corp II

(Exact

name of Registrant as specified in its charter)

Cayman

Islands

001-43095

N/A

(State or other jurisdiction

of incorporation)

(Commission File Number)

(I.R.S. Employer

Identification Number)

OT 09-31

Central

Park Towers Offices

Dubai

International Financial Centre

PO Box 941641

Dubai,

United Arab Emirates

N/A

(Address of Principal Executive

Offices)

(Zip Code)

Registrant’s

telephone number, including area code: +971-4-3966949

N/A

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K

filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written

communications pursuant to Rule 425 under the Securities Act

☐ Soliciting

material pursuant to Rule 14a-12 under the Exchange Act

☐ Pre-commencement

communications pursuant to Rule 14d-2(b) under the Exchange Act

☐ Pre-commencement

communications pursuant to Rule 13e-4(c) under the Exchange Act

Securities registered pursuant to Section 12(b)

of the Act:

Title

of each class

Trading

Symbol(s)

Name

of each exchange on which registered

Units,

each consisting of one Class A ordinary share, par value $0.0001 per share, and one-half of one redeemable warrant

IRABU

NYSE

Class

A ordinary shares, par value $0.0001 per share

IRAB

NYSE

Warrants,

each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share

IRABWS

NYSE

Indicate by check mark whether the registrant

is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities

Exchange Act of 1934 (17 CFR §240.12b-2).

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 1.01. Entry into a Material Definitive Agreement.

The disclosure contained in Item 2.03 is incorporated

by reference in this Item 1.01.

Item 2.03. Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

On October 20, 2026, Iris Acquisition Corp II,

a Cayman Islands exempted company (the “Company”), issued an unsecured promissory note in the aggregate principal amount of

up to $250,000 (the “Note”) to individuals or entities listed on the Note (collectively, the “Payee”). Pursuant

to the Note, the Payee agreed to loan to the Company an aggregate amount of up to $250,000 (the “Principal Amount”). Pursuant

to the Note, the Principal Amount and the Additional Return (as described below) shall be payable on the earlier of (i) the date on which

the Company consummates an initial business combination as such term is defined in the Company’s Amended

and Restated Memorandum and Articles of Association (the “Business Combination”), or (ii) the date the Company liquidates

if a Business Combination is not consummated. The Note bears no interest rate. The Note provides that, in the event a Business Combination

is consummated (i) on or before December 31, 2027, the Company shall pay Payee, in addition to the Principal Amount, an amount equal to

150% of the Principal Amount or (ii) after December 31, 2027, the Company shall pay Payee, in addition to the Principal Amount, an amount

equal to 250% of the Principal Amount (either such payment, the “Additional Return”).

In the event that the Company does not consummate

a Business Combination, the Note will be repaid only from amounts remaining outside of the Company’s trust account, if any.

The proceeds of the Note will be used for the

Company to pay various expenses of the Company and for general corporate purposes.

The foregoing description of the Note is qualified

in its entirety by reference to the full text of the Note, a copy of which is filed with this Current Report on Form 8-K as Exhibit 10.1

and is incorporated herein by reference.

Item 9.01 Financial Statements and Exhibits

Exhibit

Number

Description

10.1

Promissory Note dated October 20, 2026

104

Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

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.

Dated: October 23, 2026

Iris Acquisition Corp II

By:

/s/ Sumit Mehta

Name:

Sumit Mehta

Title:

Chief Executive Officer

EX-10.1 — EXHIBIT 10.1

EX-10.1

Filename: iac28kex10-1.htm · Sequence: 2

Exhibit 10.1

THIS PROMISSORY NOTE (“NOTE”) HAS

NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”). THIS NOTE HAS BEEN ACQUIRED FOR INVESTMENT

ONLY AND MAY NOT BE SOLD, TRANSFERRED OR ASSIGNED IN THE ABSENCE OF REGISTRATION OF THE RESALE THEREOF UNDER THE SECURITIES ACT OR AN

OPINION OF COUNSEL REASONABLY SATISFACTORY IN FORM, SCOPE AND SUBSTANCE TO THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED.

PROMISSORY NOTE

Principal Amount: Up to $250,000 Dated as of October 20, 2026

Iris Acquisition Corp II, a Cayman Islands exempted

company and blank check company (the “Maker”), promises to pay to the order of Harraden Circle Investors LP, Harraden Circle

Concentrated LP and Harraden Circle Special Opportunities LP or their registered assigns or successors in interest (collectively the “Payee”),

or order, the principal sum of up to Two Hundred and Fifty Thousand Dollars ($250,000) in lawful money of the United States of America,

on the terms and conditions described below. All payments on this Note shall be made by check or wire transfer of immediately available

funds or as otherwise determined by the Maker to such account as the Payee may from time to time designate by written notice in accordance

with the provisions of this Note.

1. Principal. The principal balance of this

Note and the Additional Return (as described below) shall be payable by the Maker on the date on which Maker consummates an initial

business combination (a “Business Combination”). In the event a Business Combination is consummated (i) on or before

December 31, 2027, Maker shall pay Payee, in addition to the Principal Amount, an amount equal to 150% of the Principal Amount of

this Note or (ii) after December 31, 2027, Maker shall pay Payee, in addition to the Principal Amount, an amount equal to 250% of

the Principal Amount of this Note (either such payment, the “Additional Return”). For the avoidance of doubt, the

Additional Return is contingent on completion of a Business Combination and in consideration of the risk that a Business Combination

is not completed and sufficient funds are not available to pay Payee. Notwithstanding anything to the contrary herein, the full

payment (principal plus the Additional Return) shall be paid in a single lump sum at, and conditioned upon, the closing of a

Business Combination, with no partial or installment payments permitted. Under no circumstances shall any individual, including but

not limited to any officer, director, employee or shareholder of the Maker, be obligated personally for any obligations or

liabilities of the Maker hereunder. Notwithstanding any other provision hereof, if the Maker liquidates, dissolves, or winds up, or

its Business Combination deadline expires, in either case without consummating a Business Combination, then, upon the occurrence of

such event, the Principal Amount shall be paid to the Payee solely from, and only to the extent of, any funds and assets of the

Maker held outside of the Trust Account (as defined in Section 12),

2. Interest. No interest shall accrue on the unpaid

principal balance of this Note.

3. Drawdown Requests. Maker and Payee agree that

Maker may request up to Two Hundred and Fifty Thousand Dollars ($250,000) in aggregate for costs and expenses reasonably related to Maker’s

working capital needs prior to the consummation of the Business Combination. The Payee shall make available $250,000 at signing of this

promissory note (the breakdown of payments as between the entities is described in the Appendix). The principal of this Note may be drawn

down from time to time prior to the earlier of: (i) December 31, 2027 or (ii) Maker’s completion of a Business Combination. Each

Drawdown Request must state the amount to be drawn down, and must not be an amount less than Ten Thousand Dollars ($10,000) unless agreed

upon by Maker and Payee. Payee shall fund each Drawdown Request no later than five (5) business days after receipt of a Drawdown Request;

provided, however, that the maximum amount of drawdowns collectively under this Note is Two Hundred and Fifty Thousand Dollars ($250,000).

Notwithstanding the foregoing, Payee shall have no obligation to fund any Drawdown Request if (i) an Event of Default has occurred and

is continuing, (ii) the drawdown period has expired, or (iii) Maker has publicly announced or resolved to liquidate, dissolve or wind

up. Once an amount is drawn down under this Note, it shall not be available for future Drawdown Requests even if prepaid. No fees, payments

or other amounts shall be due to Payee in connection with, or as a result of, any Drawdown Request by Maker.

4. Application of Payments. All payments shall

be applied first to payment in full of any costs incurred in the collection of any sum due under this Note, including (without limitation)

reasonable attorney’s fees, then to the payment in full of any late charges and finally to the reduction of the unpaid principal

balance of this Note and the Additional Return.

5. Events of Default. The following shall constitute

an event of default (“Event of Default”):

(a) Failure to Make Required Payments. Failure

by Maker to pay the principal amount or Additional Return due pursuant to this Note within five (5) business days of the date specified

above.

(b) Voluntary Bankruptcy, Etc. The commencement

by Maker of a voluntary case under any applicable bankruptcy, insolvency, reorganization, rehabilitation or other similar law, or the

consent by it to the appointment of or taking possession by a receiver, liquidator, assignee, trustee, custodian, sequestrator, restructuring

officer (or other similar official) of Maker or for any substantial part of its property, or the making by it of any assignment for the

benefit of creditors, or the failure of Maker generally to pay its debts as such debts become due, or the taking of corporate action by

Maker in furtherance of any of the foregoing.

of a decree or order for relief by a court having jurisdiction in the premises in respect of Maker in an involuntary case under any

applicable bankruptcy, insolvency or other similar law, or appointing a receiver, liquidator, assignee, custodian, trustee,

sequestrator (or similar official) of Maker or for any substantial part of its property, or ordering the winding-up or liquidation

of its affairs, and the continuance of any such decree or order unstayed and in effect for a period of 60 consecutive days.

6. Remedies.

(a) Upon the occurrence of an Event of Default

specified in Section 5(a) hereof, Payee may, by written notice to Maker, declare this Note to be due immediately and payable, whereupon

the unpaid principal amount of this Note and Additional Return, and all other amounts payable hereunder, shall become immediately due

and payable without presentment, demand, protest or other notice of any kind, all of which are hereby expressly waived, anything contained

herein or in the documents evidencing the same to the contrary notwithstanding.

(b) Upon the occurrence of an Event of Default

specified in Sections 5(b) and 5(c), the unpaid principal balance of this Note and Additional Return, and all other sums payable with

regard to this Note, shall automatically and immediately become due and payable, in all cases without any action on the part of Payee.

7. Waivers. Maker and all endorsers and guarantors

of, and sureties for, this Note waive presentment for payment, demand, notice of dishonor, protest, and notice of protest with regard

to the Note, all errors, defects and imperfections in any proceedings instituted by Payee under the terms of this Note, and all benefits

that might accrue to Maker by virtue of any present or future laws exempting any property, real or personal, or any part of the proceeds

arising from any sale of any such property, from attachment, levy or sale under execution, or providing for any stay of execution, exemption

from civil process, or extension of time for payment; and Maker agrees that any real estate that may be levied upon pursuant to a judgment

obtained by virtue hereof or any writ of execution issued hereon, may be sold upon any such writ in whole or in part in any order desired

by Payee.

8. Unconditional Liability. Maker hereby waives

all notices in connection with the delivery, acceptance, performance, default, or enforcement of the payment of this Note, and agrees

that its liability shall be unconditional, without regard to the liability of any other party, and shall not be affected in any manner

by any indulgence, extension of time, renewal, waiver or modification granted or consented to by Payee, and consents to any and all extensions

of time, renewals, waivers, or modifications that may be granted by Payee with respect to the payment or other provisions of this Note,

and agrees that additional makers, endorsers, guarantors, or sureties may become parties hereto without notice to Maker or affecting Maker’s

liability hereunder.

9. Notices. All notices, statements or other

documents which are required or contemplated by this Note shall be made in writing and delivered: (i) personally or sent by first

class registered or certified mail, overnight courier service or facsimile or electronic transmission to the address designated in

writing, (ii) by facsimile to the number most recently provided to such party or such other address or fax number as may be

designated in writing by such party or (iii) by electronic mail, to the electronic mail address most recently provided to such party

or such other electronic mail address as may be designated in writing by such party. Any notice or other communication so

transmitted shall be deemed to have been given on the day of delivery, if delivered personally, on the business day following

receipt of written confirmation, if sent by facsimile or electronic transmission, one (1) business day after delivery to an

overnight courier service or five (5) days after mailing if sent by mail.

10. Construction. THIS NOTE SHALL BE CONSTRUED

AND ENFORCED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, WITHOUT REGARD TO CONFLICT OF LAW PROVISIONS THEREOF.

11. Severability. Any provision contained in this

Note which is prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of such prohibition

or unenforceability without invalidating the remaining provisions hereof, and any such prohibition or unenforceability in any jurisdiction

shall not invalidate or render unenforceable such provision in any other jurisdiction.

12. Trust Waiver. Payee hereby acknowledges has

read the Prospectus, dated February 2, 2026, of Maker and understands that Maker has established the Trust Account, initially in an amount

of $150,000,000 (without giving effect to any exercise of the underwriter’s over-allotment option) for the benefit of the Maker’s

public shareholders and that, except for a portion of the interest earned on the amounts held in the Trust Account, Maker may disburse

monies from the Trust Account only (i) to the public shareholders in the event they elect to redeem public shares in connection with the

consummation of a Business Combination, (ii) to the public shareholders in the event they elect to redeem their public shares in connection

with a shareholder vote to amend Maker’s amended and restated memorandum and articles of association (the “Charter Documents”)

to modify the substance and timing of Maker’s obligation to redeem 100% of the public shares if Maker does not complete its initial

Business Combination within the time period set forth in the Charter Documents (as such may be amended from time to time), (iii) to the

public shareholders if Maker fails to consummate a Business Combination within the time period set forth in the Charter Documents, or

(iv) to Maker after or concurrently with the consummation of a Business Combination and (b) for and in consideration of Maker entering

into this Note, Payee agrees that it does not have any right, title, interest or claim of any kind in or to any monies in the Trust Account

(“Claim”) and waives any Claim it may have in the future as a result of, or arising out of, this Note and will not seek recourse

against the Trust Account for any reason whatsoever.

13. Amendment; Waiver. Any amendment hereto or

waiver of any provision hereof may be made with, and only with, the written consent of the Maker and the Payee.

14. Assignment. No assignment or transfer of this

Note or any rights or obligations hereunder may be made by any party hereto (by operation of law or otherwise) without the prior written

consent of the other party hereto and any attempted assignment without the required consent shall be void; provided, however, that the

Payee may assign this Note to its affiliates or managed funds.

[Signature page follows]

IN WITNESS WHEREOF, Maker, intending to be legally

bound hereby, has caused this Note to be duly executed by the undersigned as of the day and year first above written.

IRIS ACQUISITION CORP II

By:

/s/ Sumit Mehta

Name:

Sumit Mehta

Title:

CEO

HARRADEN CIRCLE INVESTORS LP

By:

/s/ Frederick V. Fortmiller Jr.

Name:

Frederick V. Fortmiller Jr.

Title:

CIO

HARRADEN CIRCLE CONCENTRATED LP

By:

/s/ Frederick V. Fortmiller Jr.

Name:

Frederick V. Fortmiller Jr.

Title:

CIO

HARRADEN CIRCLE SPECIAL OPPORTUNITIES LP

By:

/s/ Frederick V. Fortmiller Jr.

Name:

Frederick V. Fortmiller Jr.

Title:

CIO

[Signature page to IPO Promissory Note]

APPENDIX – CONTRIBUTION BREAKDOWN BY EACH PAYEE

Total

Contribution by each Payee

250,000

Harraden Circle Investors LP

162,500

Harraden Circle Concentrated LP

27,500

Harraden Circle Special Opportunities LP

60,000

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14a

-Subsection 12

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- Definition

Trading symbol of an instrument as listed on an exchange.

+ References

No definition available.

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- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Securities Act

-Number 230

-Section 425

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