Form 8-K

8-K — SUPERNUS PHARMACEUTICALS, INC.

Accession: 0001356576-26-000025

Filed: 2026-05-20

Period: 2026-05-17

CIK: 0001356576

SIC: 2834 (PHARMACEUTICAL PREPARATIONS)

Item: Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

Item: Financial Statements and Exhibits

Documents

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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): May 17, 2026

Supernus Pharmaceuticals, Inc.

(Exact name of registrant as specified in its charter)

Delaware

001-35518 20-2590184

(State or other jurisdiction of incorporation or organization)

(Commission File Number)

(I.R.S. Employer Identification No.)

9715 Key West Ave

Rockville

20850

(Address of Principal Executive Offices)

(Zip Code)

Registrant’s telephone number, including area code: (301) 838-2500

Not Applicable

(Former name or former address, if changed since last report.)

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

Title of each class Trading Symbol Name of each exchange on which registered

Common Stock, $0.001 par value per share SUPN The Nasdaq Stock Market LLC

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 (see General Instruction A.2. below):

☐ 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 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). ☐

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 2.03 Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

On May 17, 2026 (the “Notice Date”), pursuant to the Contingent Value Right Agreement (the “CVR Agreement”) entered into as of July 30, 2025, by and between Supernus Pharmaceuticals, Inc., a Delaware corporation (the “Company”) and Equiniti Trust Company, LLC, a New York limited liability trust company, as Rights Agent, the Company notified the Rights Agent that Milestone 1, as defined in the CVR Agreement, was achieved on March 18, 2026. Accordingly, the Company has become obligated to pay the associated milestone payment, an amount equal to $0.50 per Contingent Value Right ("CVR"), payable in cash, without interest thereon and subject to reduction for any applicable withholding taxes in respect thereof, in the aggregate amount of approximately $33.4 million. The Company will deposit with the Rights Agent the amount necessary to pay the associated milestone payment within 20 business days of the Notice Date. Payment to holders of the CVR will be distributed pursuant to the terms and conditions of the CVR Agreement.

The foregoing description of certain terms of the CVR Agreement and the CVRs issued thereunder is not complete and is qualified in its entirety by reference to the full text of the CVR Agreement, which is incorporated herein by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on July 31, 2025 (File No. 001-35518).

The information in this Item 2.03 (including Exhibit 10.1) is being “furnished” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, whether made before or after the date of this report, except as shall be expressly set forth by specific reference in such filing.

Forward-Looking Statements

This Current Report on Form 8-K contains “forward-looking statements” that do not convey historical information, but relate to predicted or potential future events, such as statements of our plans, strategies and intentions. These statements can often be identified by the use of forward-looking terminology such as “believe,” “expect,” “intend,” “may,” “will,” “should,” or “anticipate” or similar terminology. All statements other than statements of historical facts included in this Current Report on Form 8-K are forward-looking statements. All forward-looking statements speak only as of the date of this Current Report on Form 8-K. Except for Supernus’ ongoing obligations to disclose material information under the federal securities laws, Supernus undertakes no obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise. In addition to the risks and uncertainties of ordinary business operations and conditions in the general economy and the markets in which Supernus competes, the forward-looking statements of Supernus contained in this Current Report on Form 8-K are also subject to various risks and uncertainties, including those set forth in Item 1A, “Risk Factors,” in Supernus’ Annual Report on Form 10-K for the fiscal year ended December 31, 2025 which the Company filed on March 2, 2026, and other risk factors set forth from time to time in the Company’s filings with the Securities and Exchange Commission made pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit Description

10.1*

Exhibit 10.1* - Contingent Value Rights Agreement, dated as of July 30, 2025, by and among Supernus Pharmaceuticals, Inc. and Equiniti Trust Company, LLC (incorporated by reference to Exhibit 10.1 to the Company’s Form 8-K filed on July 31, 2026, File No. 001-35518).

104 The cover page from this Current Report on Form 8-K, formatted in Inline XBRL.

*Previously filed.

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.

SUPERNUS PHARMACEUTICALS, INC.

DATED: May 20, 2026 By: /s/ Timothy C. Dec

Timothy C. Dec

Senior Vice President and Chief Financial Officer

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