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): June 18, 2020

Registrant’s telephone number, including area code: (919) 328-4400

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):

¨ 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))

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 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 x

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. x

On June 18, 2020, Liquidia Technologies, Inc., a Delaware corporation (the “Company”), held its annual meeting of stockholders (the “Annual Meeting”). At the Annual Meeting, the following matters were submitted to a vote of stockholders:

At the close of business on April 24, 2020, the record date for the determination of stockholders entitled to vote at the Annual Meeting, there were 28,371,746 shares of Common Stock outstanding and entitled to vote at the Annual Meeting. The holders of 25,429,669 shares of Common Stock were represented virtually or by proxy at the Annual Meeting, constituting a quorum.

At the Annual Meeting, the three Class II directors were elected, Charter Amendment Proposal and the Stock Option Exchange Program Proposal were approved, and the appointment of the Company’s independent registered public accounting firm for the year ending December 31, 2020 was ratified.

Proposal No. 1— Election of Class II Directors

The vote with respect to the election of Class II directors was as follows:

Proposal No. 2 — Approval of the Charter Amendment Proposal

The vote with respect to the Charter Amendment Proposal was as follows:

Proposal No. 3 — Approval of the Stock Option Exchange Program Proposal

The vote with respect to the Stock Option Exchange Program Proposal was as follows:

Proposal No. 4 — Ratification of the Appointment of Independent Registered Public Accounting Firm

The vote with respect to the ratification of the appointment of PricewaterhouseCoopers LLP as the Company’s independent registered public accounting firm for the year ending December 31, 2020 was as follows:

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.