6K ADDITIVE, INC. — Major Shareholding Notification 2026

Jan 21, 2026

ASX:6KA ASX ANNOUNCEMENT 22 JANUARY 2026

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NOTICE OF CHANGE OF INTERESTS OF SUBSTANTIAL HOLDER

6K Additive, Inc. (ASX:6KA) ( Company ) sets out below details, to the best of the Company's knowledge, of persons that are substantial holders in the Company within the meaning of section 671B of the Corporations Act 2001 (Cth) (Act) whose relevant interests within the meaning of section 608 of the Act have moved by at least 1% of the number of voting shares in the Company.

Name of SubstantialHolder	Date ofchange	Number ofvoting sharespreviouslyheld	Number ofvotingsharespresentlyheld	% of totalshares ofcommon stock/ CDIs onissuepreviouslyheld	% of totalshares ofcommonstock / CDIson issuepresentlyheld
Alcyon Investments PtyLtd (ACN 123 682 664)(Alcyon))(1)	20 January2026	24,873,235	29,772,055	9.31%	11.14%
Tribeca InvestmentPartners Pty Ltd (ACN 080430 100) (InvestmentPartners)(2)	As above	As above	As above	As above	As above
Tribeca Capital AdvisoryPty Ltd (ACN 671 951 910(Capital Advisory)(3)	As above	As above	As above	As above	As above

• (1) The Company is advised that Alcyon and its associates have a relevant interest in 29,772,055 shares of common stock in the Company due to those equity securities being held by entities that Alcyon controls, namely Investment Partners (power to vote and/or to dispose of securities as investment manager of 28,896,980 shares) and Capital Advisory (legal holder of 875,075 shares) either directly or through a nominee holder.

• (2) Investment Partners and its associates have a relevant interest in 29,772,055 shares of common stock in the Company, due to Investment Partners has power to vote and/or to dispose of securities as investment manager (28,896,980 shares) and those securities being legally held by Capital Advisory (875,075 shares) either directly or through a nominee holder, which are each under common control by Alcyon.

• (3) Capital Advisory and its associates have a relevant interest in 29,772,055 shares common stock in the Company, due to those securities being legally held by Capital Advisory (875,075 shares) and Investment Partners has power to vote and/or to dispose of securities as investment manager (28,896,980 shares) either directly or through a nominee holder, which are each under common control by Alcyon.

About 6K Additive

6K Additive, Inc. (ASX:6KA) is a US-based manufacturer and trusted supplier of premium metal powders for additive manufacturing and alloy additions for the aluminum melt industry, all made from sustainable sources. Headquartered in Burgettstown, PA, the Company’s manufacturing process produces the highest quality metal powders that are truly spherical, void of porosity and satellites with better unit economics than competing technologies. 6K Additive utilizes proprietary UniMelt[®] microwave plasma system to produce the industry’s most comprehensive portfolio of metal powder including a variety of Nickel, Titanium, Copper, and refractory powders that include, Tungsten, Rhenium, Niobium/C-103 and Tantalum. 6K Additive leverages feedstock such as certified turnings, millings, used additive powder, support material and failed builds that provide customers sustainable, domestically sourced metal powder.

This announcement has been approved for release by Jonathan Wolak, Co-Company Secretary.

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Bruce Bradshaw Raymond Gonzalez Chief Marketing Officer Investor Relations 6K Additive 6K Additive Email: bbradshaw@6KAdditive.com Email: investors@6KAdditive.com Phone: +1 603 689 4597 Phone: +61 2 9640 2600

Forward Looking Statements

This announcement contains forward-looking statements. Forward-looking statements may include statements regarding 6K Additive's intentions, objectives, plans, expectations, assumptions and beliefs about future events, including 6K Additive's expectations with respect to the financial and operating position or performance of its business, its capital position and future growth. Forward-looking statements are based on assumptions and contingencies that are subject to change without notice and are not guarantees of future performance. They involve known and unknown risks, uncertainties and other important factors, many of which are beyond the control of 6K Additive, its directors and management and which may cause actual outcomes to differ materially from those expressed or implied in this announcement, including but not limited to, the factors described in the "Risk Factors" section of the Company's Replacement Prospectus dated 11 November 2025. Readers are cautioned not to place undue reliance on forward-looking statements, which are provided for illustrative purposes only and are not necessarily a guide to future performance. No representation or warranty is made by any person as to the likelihood of achievement or reasonableness of any forward-looking statements, and to the maximum extent permitted by

law, responsibility for the accuracy or completeness of any forward-looking statements is disclaimed, and except as required by law or regulation (including ASX Listing Rules), 6K Additive undertakes no obligation to update any forward-looking statements. 6K Additive also notes that past performance may not be a reliable indicator of future performance.

Restriction on purchases of CDIs by US persons

6K Additive is incorporated in the US State of Delaware and its CDIs have not been registered under the US Securities Act of 1933 or the laws of any state or other jurisdiction in the United States. Trading of the CDIs on the ASX is not subject to the registration requirements of the US Securities Act in reliance on Regulation S under the US Securities Act and a related ‘no action’ letter issued by the US Securities and Exchange Commission to the ASX in 2000. As a result, the CDIs are “restricted securities” (as defined in Rule 144 under the US Securities Act) and may not be sold or otherwise transferred except in transactions exempt from, or not subject to, the registration requirements of the US Securities Act. For instance, US persons may purchase CDIs if they are “qualified institutional buyers” (“QIBs”, as defined in and in reliance on the exemption from registration provided by Rule 144A

under the US Securities Act). To enforce the transfer restrictions, the CDIs bear a FOR Financial Product designation on the ASX. This designation restricts any CDIs from being sold on ASX to US persons excluding QIBs. In addition, hedging transactions with regard to the CDIs may only be conducted in compliance with the US Securities Act.