Sylvamo Corporation

6,312,454 Shares of Common Stock

This prospectus covers the resale by the selling stockholders identified in this prospectus, or any other selling stockholders identified in supplements to this prospectus, of up to an aggregate of 6,312,454 shares of common stock, par value $1.00 per share ("common stock"), of Sylvamo Corporation ("Sylvamo," the "Company," "we" or "us").

We are not selling any shares of common stock under this prospectus, and we will not receive any of the proceeds from the sale or other disposition of shares of our common stock by the selling stockholders.

We are registering the resale of shares of our common stock (together with the associated preferred share purchase rights) in connection with the selling stockholders' registration rights pursuant to the Cooperation Agreement described under the headings "Prospectus Summary" and "Selling Stockholders," but the registration of those shares does not necessarily mean that any of those shares will be offered or sold by the selling stockholders pursuant to this prospectus or at all.

These securities may be offered and sold by the selling stockholders from time to time in accordance with the provisions, and subject to the limitations, set forth under the heading "Plan of Distribution." The selling stockholders may offer and sell these securities at various times in amounts, at prices and on terms to be determined by market conditions and other factors at the time of such offerings. Such sales shall not include any transactions through one or more underwriters on a firm commitment or best-efforts basis, including through overnight underwritten offerings or underwritten bought deals requiring active involvement of the Company. This prospectus describes the general terms of these securities and the general manner in which the selling stockholders will offer and sell these securities.

Our common stock is listed on the New York Stock Exchange ("NYSE") under the symbol "SLVM." The last reported closing sale price of our common stock on NYSE was $45.13 per share on March 5, 2026.