PRIVATE PLACEMENT UNITS PURCHASE AGREEMENT

This PRIVATE PLACEMENT UNITS PURCHASE AGREEMENT (this “Agreement”) is made as of the September 30, 2026, by and between Southport Acquisition Corp. II, a Cayman Islands exempted company (the “Company”) and Cohen & Company Capital Markets, a division of Cohen & Company Securities, LLC (the “Subscriber”).

WHEREAS, the Company intends to consummate an initial public offering (the “IPO”) of the Company’s units (the “Units”), each Unit consisting of one Class A ordinary share, par value $0.0001 per share (the “Class A Ordinary Shares”), of the Company, and one-half of one redeemable warrant (a “Public Warrant”) to be governed by the Warrant Agreement to be entered into between the Company and Continental Stock Transfer & Trust Company, as warrant agent (the “Warrant Agreement”). Each whole Warrant entitles the holder thereof to purchase one Class A Ordinary Share at an exercise price of $11.50 per Class A Ordinary Share;

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Southport Acquisition Corp. II

8 Bolling Place

Greenwich, CT 06830

September 30, 2026

Southport Acquisition Sponsor II LLC

8 Bolling Place

Greenwich, CT 06830

Re:	Administrative Services Agreement

Ladies and Gentlemen:

This letter agreement by and between Southport Acquisition Corp. II (the “Company”) and the Company’s sponsor, Southport Acquisition Sponsor II LLC (the “Service Provider”), dated as of the date hereof, will confirm our agreement that, commencing on the date the securities of the Company are first listed on the New York Stock Exchange (the “Listing Date”), pursuant to a Registration Statement on Form S-1 and prospectus filed with the U.S. Securities and Exchange Commission (the “Registration Statement”) and continuing until the earlier of the consummation by the Company of an initial business combination and the Company’s liquidation (in each case as described in the Registration Statement) (such earlier date hereinafter referred to as the

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INDEMNITY AGREEMENT

THIS INDEMNITY AGREEMENT (this “Agreement”) is made as of September 30, 2026, by and between Southport Acquisition Corp. II, a Cayman Islands exempted company (the “Company”), and the undersigned (“Indemnitee”).

RECITALS

WHEREAS, highly competent persons have become more reluctant to serve publicly-held companies as directors, officers or in other capacities unless they are provided with adequate protection through insurance or adequate indemnification against inordinate risks of claims and actions against them arising out of their service to and activities on behalf of such companies;

WHEREAS, the Board of Directors of the Company (the “Board”) has determined that, in order to attract and retain qualified individuals, the Company will attempt to maintain on an ongoing basis, at its sole expense, liability insurance to protect persons serving the Company and its Subsidiaries (as defined below) from certain liabilities;

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Certain confidential information contained in this document, marked by [***], has been omitted

because the registrant has determined that the information (i) is not material and (ii) is the type

that the registrant treats as private or confidential.

COINBASE PRIME BROKER AGREEMENT

General Terms and Conditions

1.

Introduction

This agreement (including, the Coinbase Custody Custodial Services Agreement attached hereto as Exhibit A (the “Custody Agreement”), the Coinbase Settlement and Transfer Agreement attached hereto as Exhibit B (the “STA”), and all other exhibits, addenda and supplements attached hereto or referenced herein, collectively, the “Coinbase Prime Broker Agreement”), is entered into by and between each entity listed in Schedule A (each a “Client”), Grayscale Investments Sponsors, LLC (“Sponsor”) , and Coinbase, Inc. (“Coinbase”), on behalf of itself and as agent for Coinbase Custody Trust Company, LLC (“Coinbase Custody” or “Trust Company”), and, as applicable, Coinbase Credit, Inc. (“Coinbase Credit,” and collectively with Coinbase and Coinbase Custody, the

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Certain confidential information contained in this document, marked by [***], has been omitted because the registrant has determined that the information (i) is not material and (ii) is the type that the registrant treats as private or confidential.

AMENDMENTTOTHECOINBASEPRIME BROKER AGREEMENT

ThisAmendment(this“Amendment”),datedasofSeptember 29,2026,totheCoinbasePrime Broker Agreement, dated October 3, 2025, by and between Coinbase, Inc. (“Coinbase”), on behalf of itselfandasagentforCoinbase,CoinbaseCustodyTrustCompany,LLC(“CoinbaseCustody”),and,as applicable,CoinbaseCredit,Inc. (“Coinbase Credit”, and collectively with CoinbaseandCoinbase Custody,the“CoinbaseEntities”),andthepartyorpartiesidentifiedasa clientthereunder(assuchCoinbasePrimeBrokerAgreementmayhavebeenamendedfromtimetotime,the“Original Agreement”), is entered into by the Coinbase Entities and each Client identifiedonScheduleAhereto. EachCoinbaseEntityandeachClientmaybeindividuallyreferredto as a “Party” and collectively, the “Parties”.

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Certain confidential information contained in this document, marked by [***], has been omitted because the registrant has determined that the information (i) is not material and (ii) is the type that the registrant treats as private or confidential.

AMENDMENT NUMBER 2 TO AMENDED AND RESTATED BITGO CUSTODIAL SERVICES AGREEMENT AND MUTUAL TERMINATION OF CUSTODIAL SERVICES AGREEMENT (GRAYSCALE BITTENSOR TRUST (TAO))

This Amendment and Mutual Termination (this “Amendment”) to the Agreement (as defined below) is made and entered into as of the date last signed below (the “Amendment Effective Date”) by and between BitGo Bank & Trust, National Association (“Custodian”) and Grayscale Investments Sponsors, LLC, on behalf of each entity listed on Schedule B (collectively, “Client”). Custodian and Client are each a “Party” and together, the “Parties”.

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(v04/23)

PAGE 10

Exhibit 10.1

Certain confidential information contained in this document, marked by [***], has been omitted because the registrant has determined that the information (i) is not material and (ii) is the type that the registrant treats as private or confidential.

AMENDED AND RESTATED BITGO CUSTODIAL SERVICES AGREEMENT

This Amended and Restated Custodial Services Agreement (this “Agreement”) is made as of June 5, 2026 (the “Effective Date”) by and between each entity listed on Schedule B (severally and not jointly, each a “Client”) and BitGo Bank & Trust, National Association (“Custodian”). This Agreement amends and restates the prior Custodial Services Agreement, effective May 15, 2025, between each Client and Custodian. This Agreement governs Client’s use of the Custodial Services and the Wallet Services (each as defined below, and collectively, the “Services”) provided or made available by Custodian.

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**[***] **

**CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE THE COMPANY CUSTOMARILY AND ACTUALLY TREATS THAT INFORMATION AS PRIVATE OR CONFIDENTIAL AND THE OMITTED INFORMATION IS NOT MATERIAL. **

**EXECUTION VERSION **

**AMENDMENT AND RESTATEMENT DEED **

**RELATING TO A USD4,100,000,000 OFFSHORE TERM LOAN **

**FACILITY (AND AN ACCORDION FACILITY) **

**OFFSHORE FACILITY AGREEMENT DATED 15 MAY 2025 **

dated 10 September 2026

between

**WG DATA HUB SDN. BHD. **

as Company

**DAYONE DATA CENTERS MALAYSIA I SDN. BHD. **

**DAYONE DATA CENTERS MALAYSIA II SDN. BHD. **

**DAYONE DATA CENTERS MALAYSIA III SDN. BHD. **

(together with the Company)

collectively as Original Borrowers and Original Guarantors

**MAYBANK INVESTMENT BANK BERHAD, **

**STANDARD CHARTERED BANK (SINGAPORE) LIMITED, **

**UNITED OVERSEAS BANK LIMITED, **

**UNITED OVERSEAS BANK (MALAYSIA) BHD, **

**OVERSEA-CHINESE BANKING CORPORATION LIMITED, **

**OCBC AL-AMIN BANK BERHAD, **

**CIMB INVESTMENT BANK BERHAD, **

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**SECOND AMENDED AND RESTATED INVESTOR RIGHTS AGREEMENT **

THIS SECOND AMENDED AND RESTATED INVESTOR RIGHTS AGREEMENT (this “Agreement”) is made and entered into as of December 31, 2025 by and among DayOne Data Centers Limited (formerly known as DigitalLand Holdings Limited) (the “Company”), a Cayman Islands exempted company with limited liability, each investor identified on Schedule* 1* under the headings “Ordinary Shareholder”, “Series A Investor”, “Series B Investor” and “Series C Investor” (each an “Investor” and, collectively, the “Investors”), and any Additional Investor (as defined below) that becomes a party to this Agreement in accordance with Section 3.17 hereof.

**RECITALS **

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RULES OF THE

EMPLOYEE SHARE OPTION PLAN 2025

Approved by the Directors: Dated 9 March, 2025

1

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**Table of Contents **

1 Definitions			4
2 Granting Options			8
2.1 Eligibility			8
2.2 Terms of Options			8
2.3 Terms of Options			8

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**DAYONE DATA CENTERS LIMITED **

**SERIES C MANAGEMENT EQUITY PLAN **

**Effective as of December 31, 2025 **

1. Establishment of the MEP; Effective Date; Duration.

(a) Establishment of the MEP; Effective Date. DayOne Data Centers Limited, a Cayman Islands exempted company with limited liability (the “Company”), hereby establishes this incentive compensation plan to be known as the “DayOne Data Centers Limited Series C Management Equity Plan,” as amended from time to time (the “MEP”). The MEP permits the grant of Incentive Stock Options, Nonqualified Stock Options, Stock Appreciation Rights, Restricted Stock, Restricted Stock Units, Other Stock-Based Awards, Other Cash-Based Awards, Dividend Equivalents, and Performance Compensation Awards. The MEP shall become effective on the Effective Date. The MEP shall remain in effect as provided in Section 1(b) of the MEP. Capitalized but undefined terms shall have the meaning set forth in Section 3 of the MEP.

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**CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE THE COMPANY CUSTOMARILY AND ACTUALLY TREATS THAT INFORMATION AS PRIVATE OR CONFIDENTIAL AND THE OMITTED INFORMATION IS NOT MATERIAL. **

**EXECUTION VERSION **

**AMENDMENT AND RESTATEMENT DEED **

**RELATING TO A USD4,100,000,000 OFFSHORE TERM LOAN **

**FACILITY AND A RM13,000,000,000 MURABAHAH TERM **

**FACILITY (AND AN ACCORDION FACILITY) **

**COMMON TERMS AGREEMENT DATED 15 MAY 2025 **

dated 10 September 2026

between

**WG DATA HUB SDN. BHD. **

as Company

**DAYONE DATA CENTERS MALAYSIA I SDN. BHD. **

**DAYONE DATA CENTERS MALAYSIA II SDN. BHD. **

**DAYONE DATA CENTERS MALAYSIA III SDN. BHD. **

collectively as DayOne Companies

**MAYBANK INVESTMENT BANK BERHAD, **

**STANDARD CHARTERED BANK (SINGAPORE) LIMITED, **

**UNITED OVERSEAS BANK LIMITED, **

**UNITED OVERSEAS BANK (MALAYSIA) BHD, **

**OVERSEA-CHINESE BANKING CORPORATION LIMITED, **

**OCBC AL-AMIN BANK BERHAD, **

**CIMB INVESTMENT BANK BERHAD, **

**CIMB BANK BERHAD, SINGAPORE BRANCH **

and

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