Supplemental Prospectus (Form 424B3)

Filed Pursuant to Rule 424(b)(3)

Registration No. 333-284501

PROSPECTUS SUPPLEMENT NO. 12

(To prospectus dated March 7, 2025)

Primo Brands Corporation

This prospectus supplement updates, amends, and supplements the prospectus dated March 7, 2025 (the "Prospectus"), which forms a part of our Registration Statement on Form S-1, as amended (Registration No. 333-284501).

This prospectus supplement is being filed to update, amend, and supplement the information included in the Prospectus with the information contained in our Current Report on Form 8-K filed with the Securities and Exchange Commission (the "SEC") on November 10, 2025, which is set forth below.

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. Capitalized terms used in this prospectus supplement and not otherwise defined herein have the meanings specified in the Prospectus. Please keep this prospectus supplement with your Prospectus for future reference.

Our Class A common stock is listed on the New York Stock Exchange ("NYSE") under the symbol "PRMB." On November 7, 2025, the closing price of our Class A common stock on the NYSE was $14.46.

Investing in our securities involves certain risks. See the section entitled "Risk Factors" beginning on page 6 of the Prospectus and under similar headings in any further amendments or supplements to the Prospectus to read about factors you should consider before buying our securities.

Neither the SEC nor any state securities commission nor any other regulatory body has approved or disapproved of these securities or passed upon the accuracy or adequacy of this prospectus supplement or the Prospectus. Any representation to the contrary is a criminal offense.

The date of this prospectus supplement is November 10, 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): November 9, 2025

Primo Brands Corporation

(Exact name of registrant as specified in its charter)

(Address of principal executive offices, including zip code)

Registrant's telephone number, including area code: (813) 544-8515

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:

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

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 8.01. Other Events.

On November 9, 2025, the Board of Directors of Primo Brands Corporation (the "Company") approved an increase of $50 million to the Company's existing share repurchase program of $250 million, bringing the total authorization under the program to $300 million worth of shares of the Company's Class A common stock (the "Revised Repurchase Program"). Under the Revised Repurchase Program, the Company had approximately $202.3 million of capacity available for repurchases as of November 9, 2025.

The Company may purchase shares from time to time at the discretion of management through open market purchases, block trades, accelerated or other structured share repurchase programs, privately negotiated transactions, Rule 10b5-1 plans or other means. Open market repurchases will be structured to occur in accordance with applicable federal securities laws, including within the pricing and volume requirements of Rule 10b-18 under the Securities Exchange Act of 1934, as amended. The manner, timing, pricing and amount of any transactions will be subject to the discretion of management and may be based upon market conditions, regulatory requirements and alternative opportunities that the Company may have for the use or investment of its capital. The program does not obligate the Company to acquire any particular amount of Class A common stock, and may be modified, suspended or terminated at any time at the discretion of the Board.

Forward-Looking Statements

This Current Report on Form 8-K ("Form 8-K") contains forward-looking statements and forward-looking information within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934 conveying management's expectations as to the future based on plans, estimates and projections at the time the Company makes the statements. Forward-looking statements involve inherent risks and uncertainties and the Company cautions you that several important factors could cause actual results to differ materially from those contained in any such forward-looking statements. You can identify forward-looking statements by words such as "may," "will," "would," "should," "could," "expect," "aim," "anticipate," "believe," "estimate," "intend," "plan," "predict," "project," "seek," "potential," "opportunities," and other similar expressions and the negatives of such expressions. However, not all forward-looking statements contain these words. The forward-looking statements contained in this Form 8-K include, but are not limited to, statements regarding future repurchases under the Revised Repurchase Program. The forward-looking statements are based on assumptions regarding management's current plans and estimates. Management believes these assumptions to be reasonable, but there is no assurance that they will prove to be accurate.

Factors that could cause actual results to differ materially from those described in this Form 8-K include, among others: our ability to manage our expanded operations following the business combination; we have no operating or financial history as a combined company; we face significant competition in the segment in which we operate; our success depends, in part, on our intellectual property; we may not be able to consummate acquisitions, or acquisitions may be difficult to integrate, and we may not realize the expected benefits; our business is dependent on our ability to maintain access to our water sources; our ability to respond successfully to consumer trends related to our products; the loss or reduction in sales to any significant customer; our packaging supplies and other costs are subject to price increases; the affiliates of One Rock Capital Partners, LLC own a significant amount of the voting power of the Company, and their interests may conflict with or differ from the interests of other stockholders; legislative and executive action risks; risks associated with our substantial indebtedness; and other factors contained in the Company's Annual Report on Form 10-K and its quarterly reports on Form 10-Q, as well as other filings with the Securities and Exchange Commission. The Company does not undertake to update or revise any of these statements considering new information or future events, except as expressly required by applicable law.

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 hereunto duly authorized.