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 17, 2020

OCULAR THERAPEUTIX, INC.

(Exact Name of Company as Specified in Charter)

24 Crosby Drive

Bedford, MA 01730

(Address of Principal Executive Offices) (Zip Code)

Company’s telephone number, including area code: (781) 357-4000

(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):

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

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).

Emerging growth company    ¨

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 2.02. Results of Operations and Financial Condition.

On July 17, 2020, Ocular Therapeutix, Inc. (the “Company”) issued a press release (the “Release”) to provide a business update. A copy of the Release is included as Exhibit 99.1 hereto and is incorporated by reference herein.

Although the Company is currently in the process of finalizing its financial results for the quarter ended June 30, 2020, the Company disclosed in the Release that it expects to report approximately $1.6 million of total net product revenue, approximately $1.4 million of net product revenue for DEXTENZA^®, and approximately $0.2 million of net product revenue for ReSure^® Sealant, in each case for the quarter ended June 30, 2020. The estimated net product revenue figures are based on preliminary and unaudited information and management’s estimates as of the date of this Current Report on Form 8-K and are subject to completion of the Company’s financial closing procedures. The Company’s independent registered public accounting firm has not conducted an audit or review of, and does not express an opinion or any other form of assurance with respect to, the estimated net product revenue figures.

The information in this Current Report on Form 8-K, including Exhibit 99.1 attached hereto, shall not be deemed to be “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of such section, nor will such information be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as may be expressly set forth by specific reference in such filing.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits

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.