Exhibit 99.1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1)(iii) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a Statement on Schedule 13G dated August 14, 2018 (including amendments thereto) with respect to the Common Stock of Maxwell Technologies, Inc. This Joint Filing Agreement shall be filed as an Exhibit to such Statement.

Dated: August 14, 2018

VIEX Opportunities Fund, LP – Series One
	By:	VIEX GP, LLC General Partner
	By:		/s/ Eric Singer
			Name:	Eric Singer
			Title:	Managing Member

VIEX GP, LLC
By:	/s/ Eric Singer
	Name:	Eric Singer
	Title:	Managing Member

VIEX Special Opportunities Fund III, LP
	By:	VIEX Special Opportunities GP III, LLC General Partner
	By:	/s/ Eric Singer
		Name:	Eric Singer
		Title:	Managing Member

VIEX Special Opportunities GP III, LLC
	By:	/s/ Eric Singer
		Name:	Eric Singer
		Title:	Managing Member

VIEX Capital Advisors, LLC
	By:	/s/ Eric Singer
		Name:	Eric Singer
		Title:	Managing Member

/s/ Eric Singer

Eric Singer