UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Forthe month of July 2025

Commission File Number: 001-38313

Amber International Holding Limited

(Registrant’sname)

1 Wallich Street, #30-02 Guoco Tower, Singapore078881

Tel:+65 60220228

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annualreports under cover of Form 20-F or Form 40-F.

Form20-F  x Form 40-F  o

EXHIBIT INDEX

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, thereunto duly authorized.

Date:July 3, 2025

Exhibit 99.1

Amber International Accelerates Crypto ReserveStrategy with Recently Announced $25.5 Million
Private Placement Backed by Leading Global Investors

Institutions Subscribe at US$10.45 per ADS,Demonstrating Strong Investor Confidence

SINGAPORE, July 3, 2025 /PRNewswire/-- Amber International Holding Limited (Nasdaq: AMBR) ("Amber International", or the "Company"), a leading providerof institutional crypto financial services & solutions and operating under the brand name "Amber Premium", today announcedcontinued progress on its $100 million Crypto Ecosystem Reserve Strategy, enhanced by proceeds from a recently announced $25.5 millionprivate placement.

Participating institutional investors subscribed at a price of US$10.45per American Depositary Share (ADS), determined based on a 5% discount to the 3-day volume-weighted average price (VWAP) of AMBR's ADSson Nasdaq between June 25 and June 27, 2025. This corresponds to US$2.09 per Class A ordinary share, based on the 5:1 ratio of Class Aordinary shares to ADSs. The private placement involved the issuance of 12,200,915 Class A ordinary shares—equivalent to 2,440,183ADSs—and was supported by a distinguished group of institutional investors including CMAG Funds, Mile Green, Pantera Capital, ChocoUp, Kingkey Financial International (Holdings) Limited (1468.HK), and other prominent investors.

Proceeds from the private placementwill be strategically used to enhance Amber International's $100 million Crypto Reserve initiative, which is designed to support long-termecosystem alignment and product innovation. Since the strategy's announcement earlier this year, the reserve has been allocated towardmajor digital assets including Bitcoin (BTC), Ethereum (ETH), and Solana (SOL), with ongoing deployment into Binance Coin (BNB), Ripple(XRP), and Sui (SUI).

The Company is uniquely positioned toleverage its Ecosystem Reserve to support innovative projects on these blockchains, delivering differentiated products and services toinstitutional clients. The Reserve will further empower the Company to remain at the forefront of blockchain innovation in areas suchas Real World Assets (RWA) and AgentFi, strengthening its leadership in the next wave of Web3 financial infrastructure.

About Amber International Holding Limited

Amber International Holding Limited(Nasdaq: AMBR), operating under the brand name "Amber Premium", is a leading provider of institutional crypto financial servicesand solutions. A subsidiary of Amber Group, Amber Premium delivers institutional-grade market access, execution infrastructure, and investmentsolutions to help institutions and high-net-worth individuals optimize their digital asset portfolios. The firm offers a regulated, scalablefinancial ecosystem powered by proprietary blockchain and financial technologies, AI-driven risk management, and quantitative algorithmsacross CeFi, DeFi, and OTC markets. Learn more at www.ambr.io.

Safe Harbor Statement

This announcement contains forward-lookingstatements within the meaning of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. All statements otherthan statements of historical fact in this announcement are forward-looking statements. These forward-looking statements are inherentlyuncertain, and shareholders and other potential investors must recognize that actual results may differ materially from the expectationsas a result of a variety of factors. Such forward-looking statements are based upon management's current expectations and include knownand unknown risks, uncertainties and other factors, many of which are hard to predict or control, that may cause the actual results, performance,or plans to differ materially from any future results, performance or plans expressed or implied by such forward-looking statements. Suchrisks and uncertainties include, but are not limited to: (i) the risk that the Company may not obtain the regulatory approval in relationto DWM Asset Restructuring in a timely manner or at all and may need to continue relying on the intercompany service agreements to receivethe economic benefits of the WFTL Assigned Contracts; (ii) risks related to the performance of the amendment, waiver and framework agreement,including the expected timing and likelihood of receipt of the regulatory approvals contemplated therein; (iii) the risk that the Company'sbusiness lines are nascent, not fully proven by market and subject to material legal, regulatory, operational, reputational, tax and otherrisks in the jurisdictions where it operates; (iv) the risk of declining prices of digital assets and reduced transaction volumes conductedby the Company; (v) regulatory and market risks related to cryptocurrencies and digital assets and in the jurisdictions where the Companyoperates; (vi) risks related to fluctuations in the market price of bitcoin and any associated unrealized gains or losses on the digitalassets that the Company may record in its financial statements as a result of a change in the market price of bitcoin from the value atwhich the Company's bitcoins are carried on its balance sheet, as well as commercial, legal, regulatory, accounting and technical uncertaintiesassociated with the Company's crypto holdings; (vii) a decrease in liquidity in the markets in which the cryptocurrencies and digitalassets are traded; and (viii) the impact of the availability of spot exchange traded products and other investment vehicles for digitalassets. Further information regarding these and other risks is included in the Company's annual report on Form 20-F and other filingswith the SEC. Investors can identify these forward-looking statements by words or phrases such as "may," "will," "expect," "anticipate," "aim," "estimate," "intend," "plan," "believe," "potential,"continue," "is/are likely to" or other similar expressions. The Company undertakes no obligation to update forward-lookingstatements to reflect subsequent occurring events or circumstances, or changes in its expectations, except as may be required by law.Although the Company believes that the expectations expressed in these forward-looking statements are reasonable, it cannot assure youthat such expectations will turn out to be correct, and the Company cautions investors that actual results may differ materially fromthe anticipated results.

Media & Investor Contacts

In Asia:

Amber International Holding Limited

Serena Wang

Phone: +65 6022 0228

E-mail: pr@ambr.io | ir@ambr.io | ambr@paradigmconsulting.com.hk

In the United States:

International Elite Capital Inc.

Annabelle Zhang

Tel: +1 (646) 866-7928

E-mail: amber@iecapitalusa.com