Company: SUPN
Filing Date: 2025-10-16
Form Type: 8-K/A
Source: 0001356576-25-000062
Chunk: 1

Company: SUPERNUS PHARMACEUTICALS, INC.
Filing Date: 2025-10-16
Form: 8-K/A
Chunk 1
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 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. ☐

### EXPLANATORY NOTE
On June 13, 2025, Supernus Pharmaceuticals, Inc. (the “Supernus”) entered into an Agreement and Plan of Merger, dated as of June 13, 2025 (the “Merger Agreement”), with Sage Therapeutics, Inc., a Delaware corporation (“Sage”), and Saphire, Inc., a Delaware corporation and a wholly-owned subsidiary of Supernus (“Purchaser”). All capitalized terms used herein and not otherwise defined have the meanings given to such terms in the Merger Agreement.

Pursuant to the Merger Agreement, on July 2, 2025, Purchaser commenced a tender offer to purchase all of the outstanding shares of common stock of Sage, par value $0.0001 per share (the “Shares”), at a price of (i) $8.50 per Share, in cash, less any applicable withholding taxes and without interest (the “Closing Amount”), plus (ii) one contingent value right per Share (a “CVR”), which represents the right to receive contingent payments of up to $3.50 per Share, in cash, less any applicable withholding taxes and without interest, which amount will become payable, if at all, if specified milestones are achieved prior to June 30, 2026, December 31, 2027, December 31, 2028 and December 31, 2030, as applicable, pursuant to the CVR Agreement (collectively, the Closing Amount plus one CVR, the “Offer Price”), upon the terms and subject to the conditions set forth in the Offer to Purchase, dated July 2, 2025 (together with any amendments, supplements or modifications thereto, the “Offer to Purchase”), and in the related Letter of Transmittal (together with any amendments, supplements, or modifications thereto, the “Letter of Transmittal” and, together with the Offer to Purchase, the “Offer”).

The Offer and related withdrawal rights expired