Company: SUPN
Filing Date: 2025-07-02
Form Type: SC TO-T
Source: 0001104659-25-065398
Chunk: 4

Company: SUPERNUS PHARMACEUTICALS, INC.
Filing Date: 2025-07-02
Form: SC TO-T
Chunk 4
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 reference:

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Section 8 — “Certain Information Concerning Supernus and Purchaser”

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Schedule I

## Item 9.   Persons/Assets, Retained, Employed, Compensated or Used.
(a) The information set forth in the following sections of the Offer to Purchase is incorporated herein by reference:

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the “Summary Term Sheet”

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Section 3 — “Procedures for Accepting the Offer and Tendering Shares”

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Section 10 — “Background of the Offer; Past Contacts or Negotiations with Sage”

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Section 18 — “Fees and Expenses”

## Item 10.   Financial Statements.
Not applicable.

## Item 11.   Additional Information.
(a)(1) The information set forth in the following sections of the Offer to Purchase is incorporated herein by reference:

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Section 8 — “Certain Information Concerning Supernus and Purchaser”

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Section 10 — “Background of the Offer; Past Contacts or Negotiations with Sage”

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Section 11 — “The Merger Agreement; CVR Agreement”

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Section 12 — “Purpose of the Offer; Plans for Sage”

<div align='center'>3</div>

(a)(2) The information set forth in the following sections of the Offer to Purchase is incorporated herein by reference: • Section 12 — “Purpose of the Offer; Plans for Sage” • Section 15 — “Conditions of the Offer” • Section 16 — “Certain Legal Matters; Regulatory Approvals” (a)(3) The information set forth in the following sections of the Offer to Purchase is incorporated herein by reference: • Section 15 — “Conditions of the Offer” • Section 16 — “Certain Legal Matters; Regulatory Approvals” (a)(4) The information set forth in the following sections of the Offer to Purchase is incorporated herein by reference: • Section 13 — “Certain Effects of the Offer” (a)(5) The information set forth in the following sections of the Offer to Purchase is incorporated herein by reference: • Section 16 — “Certain Legal Matters; Regulatory Approvals” (c) The information set forth in the Offer to Purchase is incorporated herein by reference. Item 12. Exhibits.

| ​ | Exhibit No. | ​ | ​ | Description                                                                                                                                                                                                                                                                                           | ​ |
| ​ |    -a)(1)(A | ​ | ​ | Offer to Purchase, dated July 2, 2025.*                                                                                                                                                                                                                                                               | ​ |
| ​ |    -a)(1)(B |