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): October 22, 2015

Supernus Pharmaceuticals, Inc.

(Exact name of registrant as specified in its charter)

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

Not Applicable

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

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):

o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 8.01                                           Other Events.

On October 22, 2015, Supernus Pharmaceuticals, Inc. (the “Company”) issued a press release announcing that the United States Food and Drug Administration (“FDA”) has accepted for review the Company’s supplemental new drug application for Trokendi XR®, requesting FDA approval to expand the indication for Trokendi XR to include treatment for adults for migraine headache. A copy of this press release is furnished as Exhibit 99.1 hereto and is incorporated herein by reference.

Item 9.01                                           Financial Statements and Exhibits.

(d)                                 Exhibit

The following document is furnished as an Exhibit pursuant to Item 8.01 hereof:

Exhibit 99.1 — Press Release Dated October 22, 2015.

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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.

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EXHIBIT INDEX

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Exhibit 99.1

Supernus Announces FDA Acceptance of sNDA to Add Migraine to Trokendi XR® Label

ROCKVILLE, Md., October 22, 2015 — Supernus Pharmaceuticals, Inc. (NASDAQ: SUPN) announced today that the United States Food and Drug Administration (FDA) has accepted for review the company’s supplemental new drug application (sNDA) for Trokendi XR®. The application requests FDA approval to expand the indication for Trokendi XR beyond the current indication for the treatment of epilepsy to include treatment for adults for prophylaxis of migraine headache. Under the Prescription Drug User Fee Act (PDUFA) guidelines, the FDA has set a target date in the second quarter of 2016 to complete its review.

“Now that our application is under review, we look forward to working with the FDA to ensure a timely approval of the new indication,” said Jack Khattar, president and chief executive officer of Supernus Pharmaceuticals. “If approved for use in migraine, Trokendi XR would represent an important new treatment option for adult patients suffering from this condition.”

About Supernus Pharmaceuticals, Inc.

Supernus Pharmaceuticals, Inc. is a specialty pharmaceutical company focused on developing and commercializing products for the treatment of central nervous system, or CNS, diseases. The Company markets two products for epilepsy, Oxtellar XR® (extended-release oxcarbazepine) and Trokendi XR® (extended-release topiramate). The Company is also developing several product candidates in psychiatry to address large market opportunities in ADHD, including ADHD patients with impulsive aggression. These product candidates include SPN-810 for impulsive aggression in ADHD and SPN-812 for ADHD.

Forward Looking Statements

This press release contains forward-looking statements regarding the timing of the Company’s ability to market Trokendi XR® for migraine. Actual results may differ materially from those in these forward-looking statements as a result of various factors, including, but not limited to, the Company’s ability to obtain final regulatory approval for the migraine indication, commercialize its products successfully, whether physicians will prescribe and patients will use its products, once available, and competition in their respective markets. For a further description of these and other risks facing the Company, please see the risk factors described in the Company’s Annual Report Form 10-K that was filed with the United States Securities and Exchange Commission on March 12, 2015 under the caption “Risk Factors”.  Forward-looking statements speak only as of the date of this press release, and the Company undertakes no obligation to update or revise these statements, except as may be required by law.

Contact:

Jack A. Khattar, President and CEO

Gregory S. Patrick, Vice President and CFO

Supernus Pharmaceuticals, Inc.

301-838-2591

Or

Investor Contact:

Peter Vozzo

Westwicke Partners

Office: (443) 213-0505

Mobile: (443) 377-4767

Email: peter.vozzo@westwicke.com