Wolfspeed Inc美股招股说明书(2026-03-19版)

This prospectus supplement updates, amends and supplements the prospectus dated December15, 2025 (the “Prospectus”), which forms a part of ourRegistration Statement on Form S-1 (Registration No.333-291524). Capitalized terms used in this prospectus supplement and not otherwise definedherein have the meanings specified in the Prospectus. This prospectus supplement is being filed to update, amend and supplement the information included in the Prospectus with the information contained inour Current Report on Form 8-K, filed with the Securities and Exchange Commission (“SEC”) on March19, 2026, 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 thisprospectus supplement updates or supersedes the information contained in the Prospectus. Please keep this prospectus supplement with your Prospectusfor future reference. Our shares of Common Stock are listed on the New York Stock Exchange (the “NYSE”) under the symbol “WOLF.” On March18, 2026, the closingsale price of our Common Stock was $16.78 per share. Investing in shares of our Common Stock involves a high degree of risk. You should carefully review the risks and uncertainties that aredescribed in the “Risk Factors” section beginning on page 6 of the Prospectus and under similar headings in any amendments or supplementsto the Prospectus or in the documents incorporated by reference into the Prospectus. Neither the U.S. Securities and Exchange Commission (the “SEC”) nor any state securities commission has approved or disapproved of thesesecurities or determined if the Prospectus or this prospectus supplement is truthful or complete. Any representation to the contrary is acriminal offense. The date of this prospectus supplement is March19, 2026 UNITED STATESSECURITIES AND EXCHANGE COMMISSIONWashington, D.C. 20549 FORM 8-K CURRENT REPORTPursuant to Section13 OR 15(d)of The Securities Exchange Act of 1934 Date of Report (Date of Earliest Event Reported): March19, 2026 WOLFSPEED, INC. (Exact name of registrant as specified in its charter) 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 thefollowing 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)) Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405)or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2). 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 anynew or revised financial accounting standards provided pursuant to Section13(a) of the Exchange Act.☐ Item 1.01. Entry into a Material Definitive Agreement. Equity Securities Offering Equity Purchase Agreement On March19, 2026, Wolfspeed, Inc. (the “Company”) entered into a Securities Purchase Agreement (the “Equity Purchase Agreement”) with certaininvestors (the “Equity Securities Investors”). The Purchase Agreement provides for the sale and issuance by the Company of an aggregate of: (i)3,250,030 shares (the “Shares”) of the Company’s common stock, par value $0.00125 per share (the “Common Stock”) and (ii)pre-funded warrants (the“Pre-Funded Warrants,” and, together with the Shares, the “Equity Securities”) to purchase up to an aggregate of 2,000,000 shares of Common Stock ina private placement (the “Equity Securities Placement”). The price per Share is $18.458, and the price per Pre-Funded Warrant is $18.448. The closingof the Equity Securities Placement is expected to occur on March26, 2026 (the “Equity Securities Closing”), subject to customary closing conditions. The Pre-Funded Warrants have an exercise price of $0.01 per underlying share of Common Stock, exercisable at any time until each is fully exercised,and will not expire until each is fully exercised, subject to the ownership limitations described below. The number of shares of Common Stock issuableupon exercise of each Pre-Funded Warrant is subject to appropriate adjustment in the event of certain stock dividends and distributions, stock splits,stock combinations, reclassifications or similar events affecting the Common Stock, as well as upon certain distributions of assets, including cash, stockor other property, to the Company’s stockholders. The Pre-Funded Warrants inc