北方石油与天然气有限公司美股招股说明书（2026年6月2日版）

3,689,413 Shares of Common Stock This prospectus supplement to the registration of the potential offer and resale of up to 3,689,413 shares (the “Shares”) of our common stock, parvalue $0.001 per share (“common stock”), by the selling stockholder identified in the “Selling Stockholder” section of this prospectus supplement (the“Selling Stockholder”). The Selling Stockholder acquired the Shares on June1, 2026 pursuant to the PSA (as defined herein). We issued the Shares inreliance upon the exemption from registration afforded by Section4(a)(2) of the Securities Act of 1933, as amended (the “Securities Act”), andare We are not offering any shares of common stock for sale under this prospectus supplement, and we will not receive any proceeds from the sale ofthe Shares by the Selling Stockholder. Our common stock is listed on the New York Stock Exchange (“NYSE”) under the symbol “NOG.” On June1, 2026, the last sale price of ourcommon stock as reported on the NYSE was $22.37per share. This prospectus supplement should be read in conjunction with the prospectus. Any statement contained in the prospectus shall be deemed to bemodified or superseded to the extent this prospectus supplement modifies or supersedes such statement. This prospectus supplement is not completewithout, and may not be delivered or used except in connection with, the prospectus, including all amendments and supplements thereto. An investment in our common stock involves significant risks. You should carefully consider the matters describedunder the caption entitled “RiskFactors” beginning on pageS-4 of this prospectus supplement, as well as documentswe file with the Securities and Exchange Commission that are incorporated by reference in this prospectus supplement Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities ordetermined if this prospectus supplement or the accompanying prospectus is or are truthful or complete. Any representation to the contrary is a Table of Contents Prospectus Supplement WHERE YOU CAN FIND MORE INFORMATIONCAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS RISK FACTORSTHE COMPANYUSE OF PROCEEDSDESCRIPTION OF CAPITAL STOCKDESCRIPTION OF DEPOSITARY SHARESDESCRIPTION OF WARRANTSDESCRIPTION OF PURCHASE CONTRACTSDESCRIPTION OF UNITSPLAN OF DISTRIBUTIONLEGAL MATTERSEXPERTS Table of Contents ABOUT THIS PROSPECTUS SUPPLEMENT This prospectus supplement and the prospectus are part of an “automatic shelf” registration statement that we filed with the Securities andExchange Commission (the “SEC”) as a “well-known seasoned issuer” as defined in Rule 405 under the Securities Act utilizing a “shelf” registration This document is in two parts. The first part is this prospectus supplement,which describes certain matters relating to us and the SellingStockholder and the specific terms of this offering of shares of common stock by the Selling Stockholder. This prospectus supplement also adds to andupdates information contained in, or incorporated by reference into, the accompanying prospectus.The second part, the accompanying prospectus,provides more general information about us and securities we may offer from time to time, some of which may not apply to this offering. To the extentthere is a conflict between the information contained in this prospectus supplement, on the one hand, and the information contained in the prospectus orin any document incorporated by reference that was filed with the SEC before the date of this prospectus supplement, on the other hand, you should rely We have not, and the Selling Stockholder has not, authorized any other person to provide you with different or additional information other thanthat contained or incorporated by reference in this prospectus supplement, the accompanying prospectus or any related free writing prospectusesprepared by or on behalf of us or to which we have referred you. Neither we nor the Selling Stockholder take any responsibility for, and can provide no This prospectus supplement and the accompanying prospectus do not constitute, and may not be used in connection with, an offer or solicitationby anyone in any jurisdiction in which such offer or solicitation is not authorized or in which the person making such offer or solicitation is not qualified You should assume that the information in this prospectus supplement and the accompanying prospectus is accurate only as of the date on thefront of the applicable document, that the information appearing in any related free writing prospectus is accurate only as of the date of that free writingprospectus, and that any information incorporated by reference is accurate only as of the date of the document incorporated by reference, regardless of You should read both this prospectus supplement and the accompanying prospectus as well as additional information incorporated by referenceherein and described under “Where You Can Find More In