Inovio Pharmaceuticals Inc — Current Report (Form 8-K)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 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 19, 2026

Inovio Pharmaceuticals, Inc.

(Exact name of registrant as specified in its charter)

660 W. Germantown Pike, Suite 110

Plymouth Meeting, PA 19462

(Address of principal executive offices, including zip code)

(267) 440-4200

(Registrant’s telephone number, including area code)

N/A

(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:

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. ☐

On May 19, 2026, the board of directors (the “Board”) of Inovio Pharmaceuticals, Inc. (the “Company”) approved an amendment to the Company’s Amended and Restated bylaws (the “Bylaws Amendment”) effective immediately to further enhance the Company’s corporate governance practices by, among other things, (i) clarifying the role of the Chairman of the Board, including that the Chairman shall not be deemed an officer of the corporation unless expressly designated as such by the Board, (ii) establishing the position of Lead Independent Director, including the designation, duties and responsibilities thereof, and requiring the appointment of a Lead Independent Director in the event the Chief Executive Officer also serves as Chairman of the Board and (iii) updating the order of presiding officers at meetings of the Board and stockholders to reflect the foregoing changes.

The foregoing description of the Bylaws Amendment does not purport to be complete and is qualified in its entirety by reference to the full text of the Bylaws Amendment, a copy of which is filed as Exhibit 3.1 to this Current Report on Form 8-K and incorporated herein by reference.

On May 20, 2026, the Company held its 2026 Annual Meeting of Stockholders (the “Annual Meeting”), at which the stockholders considered four proposals, each of which is described in more detail in the Company’s definitive proxy statement filed with the Securities and Exchange Commission on April 7, 2026 (the “Proxy Statement”).

Of the 69,438,100 shares of the Company’s common stock, par value $0.001 per share (the “Common Stock”) entitled to vote as of the record date, which includes shares of Common Stock issuable on conversion of outstanding shares of Series C Cumulative Convertible Preferred Stock, a total of 40,670,629 shares of Common Stock, or 58.57%, were present or represented by proxy at the Annual Meeting. Set forth below are the results of the matters submitted for a vote of stockholders at the Annual Meeting.

Proposal 1: The election of the following eight nominees as directors of the Company to serve until the Company’s 2027 Annual Meeting of Stockholders and until their successors are elected. The votes were cast as follows:

Proposal 2: The ratification of the appointment by the Audit Committee of the Board of Directors of Ernst & Young LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2026. The votes were cast as follows:

Proposal 3: The approval, on a non-binding advisory basis, of the compensation of the NEOs described in the Proxy Statement. The votes were cast as follows:

Proposal 4: The approval of the amendment and restatement of the Company’s Amended and Restated 2023 Omnibus Incentive Plan as described in the Proxy Statement. The votes were cast as follows:

(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.