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): May 14, 2014

TRIVASCULAR TECHNOLOGIES, INC.

(Exact Name of Registrant as Specified in its Charter)

3910 Brickway Blvd.

Santa Rosa, California

(Address of principal executive offices)

95403

(Zip Code)

(707) 543-8800

(Registrant’s telephone number, including area code)

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:

Item 2.02. Results of Operations and Financial Condition.

On May 14, 2014, we issued a press release announcing our financial results for the quarter ended March 31, 2014. This press release has been furnished as Exhibit 99.1 to this report and is incorporated herein by reference.

The press release furnished as Exhibit 99.1 to this report includes the non-GAAP financial measures of Adjusted EBITDA. We define EBITDA as net loss plus interest expense, income tax expense and depreciation and amortization. We define Adjusted EBITDA as EBITDA plus stock-based compensation expense and the change in value of our warrants. For a reconciliation of Adjusted EBITDA to the most comparable GAAP financial measure of net loss, please refer to the table appearing at the end of the press release. We present Adjusted EBITDA because we believe it is a useful indicator of our operating performance. Our management uses Adjusted EBITDA principally as a measure of our operating performance and believes that Adjusted EBITDA is useful to our investors because it is frequently used by securities analysts, investors and other interested parties in their evaluation of the operating performance of companies in industries similar to ours. Our management also uses Adjusted EBITDA for planning purposes, including the preparation of our annual operating budget and financial projections. Adjusted EBITDA should not be considered in isolation or as a substitute for a measure of our liquidity or operating performance prepared in accordance with U.S. GAAP, and is not indicative of net loss from operations as determined under GAAP. Adjusted EBITDA and other non-GAAP financial measures have limitations that should be considered before using these measures to evaluate our liquidity or financial performance. Adjusted EBITDA does not include certain expenses that may be necessary to review our operating results and liquidity requirements. Our definition and calculation of Adjusted EBITDA may differ from that of other companies. In addition, to facilitate the explanation of the earnings per share calculation for the three months ended March 31, 2014 and 2013, our press release also provides a pro forma calculation reflecting conversion of our convertible preferred stock in connection with the closing of our initial public offering in April 2014.

The information under this Item 2.02 and Exhibit 99.1 hereto is being furnished and shall not be deemed “filed” for the purposes of Section 18 of the Securities and Exchange Act of 1934, as amended, or the Exchange Act, or otherwise subject to the liabilities of that section, nor shall they be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01. Financial Statements and Exhibits.

The following exhibit relating to Item 2.02 shall be deemed to be furnished, and not filed:

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.

EXHIBIT INDEX