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):

July 15, 2014

LIPOCINE INC.

(Exact name of registrant as specified in its charter)

Commission File No. 001-36357

675 Arapeen Drive, Suite 202

Salt Lake City, Utah 84108

(Address of principal executive offices)(Zip Code)

Registrant’s telephone number, including area code: (801) 994-7383

Former name or former address, if changed since last report: Not Applicable

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:

¨ 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))

Item 8.01      Other Events

On July 15, 2014, Lipocine Inc. issued a press release to report the issuance of a U.S. Patent for LPCN 1021. The press release is filed as Exhibit 99.1 and is incorporated herein by reference.

Item 9.01      Financial Statements and Exhibits.

The following exhibits are filed with this report:

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.