Anteris Technologies Global Corp. (NASDAQ: AVR) resale update and board change

Rhea-AI Filing Summary

Anteris Technologies Global Corp. filed a prospectus supplement linked to its Form S-1 registration statement covering up to 9,103,796 shares of common stock that may be sold from time to time by selling stockholders. The supplement incorporates information from a newly filed Current Report on Form 8-K.

The attached 8-K notes that on December 13, 2025 (December 14, 2025 in Australia), Stephen Denaro resigned, with immediate effect, from the Company’s Board of Directors as a Class II director, and his resignation was not due to any disagreement over operations, policies or practices. He will continue as corporate secretary of Anteris Technologies Pty Ltd and as a director of that and other Australian subsidiaries. The Company’s common stock trades on Nasdaq under the symbol AVR, which closed at $4.98 per share on December 12, 2025.

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Filed pursuant to Rule 424(b)(3)

Registration No. 333-291821

Prospectus Supplement No. 1

(To Prospectus dated December 11, 2025)

This prospectus supplement updates, amends and supplements the prospectus dated December 11, 2025 (the “Prospectus”), which forms a part of our Registration Statement on Form S-1 (Registration No. 333-291821) relating to up to 9,103,796 shares of our common stock, par value $0.0001 per share (“Common Stock”), which may be offered for sale by the selling stockholders identified under the heading “Selling Stockholders” in the Prospectus. This prospectus supplement is being filed to update, amend and supplement the information included in the Prospectus with information contained in our Current Report on Form 8-K, which was filed with the Securities and Exchange Commission (the “SEC”) on December 15, 2025 (the “Current Report”). Accordingly, we have attached the Current Report to this prospectus supplement. Capitalized terms used in this prospectus supplement and not otherwise defined herein have the meanings specified in the Prospectus.

This prospectus supplement is not complete without the Prospectus. This prospectus supplement should be read in conjunction with the Prospectus, which is to be delivered with this prospectus supplement, and is qualified by reference thereto, except to the extent that the information in this prospectus supplement updates or supersedes the information contained in the Prospectus. Please keep this prospectus supplement with your Prospectus for future reference.

Our Common Stock is listed on the Nasdaq Global Market (“Nasdaq”) under the symbol “AVR.” Our CHESS Depositary Interests trade on the Australian Securities Exchange under the symbol “AVR.” On December 12, 2025, the closing price for our Common Stock on Nasdaq was $4.98 per share.

Investing in our securities involves a high degree of risk. See the section titled “Risk Factors” in the Prospectus and in the documents incorporated by reference in the Prospectus.

Neither the SEC nor any state securities commission has approved or disapproved of the securities to be offered pursuant to the Prospectus or this prospectus supplement or determined if the Prospectus or this prospectus supplement is truthful or complete. Any representation to the contrary is a criminal offense.

The date of this prospectus supplement is December 15, 2025.

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

Date of Report (Date of earliest event reported): December 15, 2025

Anteris Technologies Global Corp.

(Exact name of registrant as specified in its charter)

Delaware	001-42437	99-1407174
(State or Other Jurisdiction of Incorporation)	(Commission File Number)	(I.R.S. Employer Identification No.)

Toowong Tower, Level 3, Suite 302 9 Sherwood Road Toowong, QLD Australia		4066
(Address of Principal Executive Offices)		(Zip Code)

Registrant’s telephone number, including area code: +61 7 3152 3200

Not Applicable

(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 (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class		Trading Symbol(s)		Name of each exchange on which registered
Common Stock, par value $0.0001 per share		AVR		The Nasdaq Global Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

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 5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On December 13, 2025 (December 14, 2025 in Australia), Mr. Stephen Denaro resigned from the Board of Directors (the “Board”) of Anteris Technologies Global Corp. (the “Company”) and as a Class II director with immediate effect. The resignation from the Board was not due to any disagreement with the Company or its management with respect to any matter relating to the Company’s operations, policies or practices.

Mr. Denaro will continue to serve as the corporate secretary of Anteris Technologies Pty Ltd (“ATPL”) and as a member of the Board of Directors of ATPL and the Company’s other Australian subsidiaries.

The Board thanks Steve for his service.

SIGNATURES

Pursuant to the requirements of the Securities and Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

		Anteris Technologies Global Corp.
Date: December 15, 2025		By:	/s/ Wayne Paterson
			Name: Wayne Paterson
			Title: Vice Chairman and Chief Executive Officer

FAQ

What does Anteris Technologies Global Corp. (AVR) register in this prospectus supplement?

The prospectus supplement relates to a Form S-1 registration statement covering up to 9,103,796 shares of common stock that may be offered for sale by selling stockholders.

What is the purpose of this Anteris Technologies (AVR) prospectus supplement?

The supplement updates and amends the existing prospectus by adding information from a recent Current Report on Form 8-K, which is attached to the supplement.

What board change did Anteris Technologies Global Corp. (AVR) disclose?

The Company disclosed that Stephen Denaro resigned from its Board of Directors as a Class II director with immediate effect on December 13, 2025 (December 14, 2025 in Australia).

Did Stephen Denaro resign due to a disagreement with Anteris Technologies?

No. The filing states that his resignation from the Board was not due to any disagreement with the Company or its management regarding operations, policies, or practices.

What roles will Stephen Denaro keep at Anteris Technologies’ subsidiaries?

He will continue to serve as corporate secretary of Anteris Technologies Pty Ltd and as a member of the boards of that company and other Australian subsidiaries.

On which exchanges does Anteris Technologies Global Corp. (AVR) trade and at what recent price?

The Company’s common stock trades on the Nasdaq Global Market under the symbol AVR, with a closing price of $4.98 per share on December 12, 2025. Its CHESS Depositary Interests trade on the Australian Securities Exchange, also under AVR.

What risk disclosure does Anteris Technologies highlight for this offering?

The Company notes that investing in its securities involves a high degree of risk and directs readers to the “Risk Factors” section in the prospectus and incorporated documents.