中金科五金美股招股说明书(2026-08-04版)

PROSPECTUS SUPPLEMENT(To the Prospectus Dated March 27, 2026) We have entered into a sales agreement (the “Sales Agreement”), dated August 3, 2026, with Chaince Securities, LLC (“Chaince” orthe “Sales Agent”) relating to the offer and sale of our Class A ordinary shares, par value $0.000016666667 per share (“Class AOrdinary Shares”), offered by this prospectus supplement and the accompanying prospectus. In accordance with the terms of the SalesAgreement, we may offer and sell our Class A Ordinary Shares, from time to time through or to the Sales Agent, acting as a sales agentor principal, having an aggregate offering price of up to $9,800,000. Sales of our Class A Ordinary Shares, if any, under this prospectus supplement and the accompanying prospectus may be made in salesdeemed to be “at the market offerings” as defined in Rule 415(a)(4) under the Securities Act of 1933, as amended (the “SecuritiesAct”). The Sales Agent is not required to sell any specific number or dollar amount of securities, but will act as our sales agent usingcommercially reasonable efforts consistent with its normal trading and sales practices, on mutually agreed terms between the SalesAgent and us. There is no arrangement for funds to be received in any escrow, trust or similar arrangement. The Sales Agent will be entitled to compensation at a fixed commission rate of 3.0% of the gross proceeds from each sale of our ClassA Ordinary Shares through it pursuant to the Sales Agreement, plus a per share fee of US$0.02 per Class A Ordinary Share sold tocover execution and clearing costs. See “Plan of Distribution” beginning on page S-20 for additional information regarding thecompensation to be paid to the Sales Agent. In connection with the sale of the Class A Ordinary Shares on our behalf, the Sales Agentwill be deemed to be an “underwriter” within the meaning of the Securities Act, and the compensation of the Sales Agent will bedeemed to be underwriting commissions or discounts. We have agreed to provide indemnification and contribution to the Sales Agentagainst certain civil liabilities, including liabilities under the Securities Act or the Securities Exchange Act of 1934, as amended, or theExchange Act. As of the date of this prospectus supplement, the authorized share capital of the Company is US$50,000 divided into 2,991,000,000Class A Ordinary Shares and 9,000,000 Class B Ordinary Shares of US$0.000016666667 par value each (the “Class B OrdinaryShares”). Holders of Class A Ordinary Shares and Class B Ordinary Shares have the same rights except for voting and conversionrights as set forth in our amended and restated memorandum and articles of association currently in effect. Each holder of Class AOrdinary Shares will be entitled to one vote per one Class A Ordinary Share and each holder of Class B Ordinary Shares will beentitled to thirty (30) votes per one Class B Ordinary Share on all matters decided by poll at any general meeting. The Class BOrdinary Shares are convertible into Class A Ordinary Shares at any time after issuance at the option of the holder on a one-to-onebasis. As of the date of this prospectus supplement, we have 55,322,249 Class A Ordinary Shares and 9,000,000 Class B OrdinaryShares issued and outstanding, respectively. Our Class A Ordinary Shares are listed on the Nasdaq Capital Market under the symbol “ZJK.” On July 31, 2026, the last reported saleprice of our Class A Ordinary Shares on the Nasdaq Capital Market was US$1.55 per share. The aggregate market value of our outstanding Class A Ordinary Shares held by non-affiliates, or public float, as of August 3, 2026,was approximately $29,459,679.60, which was calculated based on 11,330,646 Class A Ordinary Shares held by non-affiliates and theprice of $2.60 per share, which was the closing price of our Class A Ordinary Shares on the Nasdaq Capital Market on June 10, 2026, adate within 60 days of the date of this prospectus supplement. During the 12 calendar months prior to and including the date of thisprospectus supplement, we have not offered or sold any securities pursuant to General Instruction I.B.5 of Form F-3. After the date ofthis prospectus supplement, we will not sell in primary offerings under General Instruction I.B.5 of Form F-3 securities having anaggregate market value, when added to the aggregate market value of securities sold by us in primary offerings under GeneralInstruction I.B.5 of Form F-3 during the 12 calendar months immediately prior to and including the date of sale, of more than one-third of our public float so long as our public float remains below $75 million. If our public float increases such that we may selladditional amounts under the Sales Agreement and the registration statement of which this prospectus supplement and theaccompanying prospectus form a part, we will file a prospectus supplement prior to making additional sales to the extent required byapplicable law. Investing in our securities involves a high degree of