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): February 24, 2020

ARMATA PHARMACEUTICALS, INC.

(Exact name of Registrant as specified in its charter)

(310) 655-2928

(Registrant’s Telephone number)

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):

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. ¨

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

On February 24, 2020, the Board of Directors (the “Board”) of Armata Pharmaceuticals, Inc. (the “Company”) amended Section 2.8 of the Company’s Amended and Restated Bylaws, as amended (the “Amended Bylaws”). The purpose of the amendment was to reduce the minimum number of days required between the record date to determine stockholders of record of the Company’s outstanding common stock and the date on which the stockholder action or meeting would take place. Prior to the amendment, the record date was required to be not less than 30 days prior to the date of the stockholder action or meeting. The Board elected to reduce the minimum number of days after the record date to ten days, as permitted under the Washington Business Corporation Act. The full text of Section 2.8 of the Amended Bylaws (as amended) is set forth below, marked to show the changes that were adopted by the Board.

2.8 Fixing of Record Date for Determining Shareholders

For the purpose of determining shareholders entitled (a) to notice of or to vote at any meeting of shareholders or any adjournment thereof, (b) to demand a special meeting, or (c) to receive payment of any dividend, or in order to make a determination of shareholders for any other purpose, the Board may fix a future date as the record date for any such determination. Such record date shall be not more than seventy (70) days, and in case of a meeting of shareholders not less than thirtyten (10) days prior to the date on which the particular action requiring such determination is to be taken. If no record date is fixed for the determination of shareholders entitled to notice of or to vote at a meeting, the record date shall be the day immediately preceding the date on which notice of the meeting is first given to shareholders. Such a determination shall apply to any adjournment of the meeting unless the Board fixes a new record date, which it shall do if the meeting is adjourned to a date more than one hundred twenty days after the date fixed for the original meeting. If no record date is set for the determination of shareholders entitled to receive payment of any stock dividend or distribution (other than one involving a purchase, redemption or other acquisition of the corporation's shares) the record date shall be the date the Board authorizes the stock dividend or distribution.

A copy of the amendment to the Amended Bylaws is attached hereto as Exhibit 3.1 and is incorporated herein by reference.

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 3.1

AMENDMENT TO THE AMENDED AND RESTATED BYLAWS

OF

ARMATA PHARMACEUTICALS, INC.

1.       Section 2.8 of the Amended and Restated Bylaws of the Corporation was amended in its entirety by unanimous vote by the Board of Directors on February 24, 2020, to read as follows:

For the purpose of determining shareholders entitled (a) to notice of or to vote at any meeting of shareholders or any adjournment thereof, (b) to demand a special meeting, or (c) to receive payment of any dividend, or in order to make a determination of shareholders for any other purpose, the Board may fix a future date as the record date for any such determination. Such record date shall be not more than seventy (70) days, and in case of a meeting of shareholders not less than ten (10) days prior to the date on which the particular action requiring such determination is to be taken. If no record date is fixed for the determination of shareholders entitled to notice of or to vote at a meeting, the record date shall be the day immediately preceding the date on which notice of the meeting is first given to shareholders. Such a determination shall apply to any adjournment of the meeting unless the Board fixes a new record date, which it shall do if the meeting is adjourned to a date more than one hundred twenty days after the date fixed for the original meeting. If no record date is set for the determination of shareholders entitled to receive payment of any stock dividend or distribution (other than one involving a purchase, redemption or other acquisition of the corporation's shares) the record date shall be the date the Board authorizes the stock dividend or distribution.

Dated this 24^th day of February 2020.