Exhibit 99.2

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 13D (including additional amendments thereto) with respect to the common stock, $0.01 par value per share, of Merrimack Pharmaceuticals, Inc., a Delaware corporation. This Joint Filing Agreement shall be filed as an Exhibit to such Statement.

Dated: September 24, 2019

JFL PARTNERS FUND LP
By:	JFL Capital Management LP General Partner
By:	JFL Capital Holdings LLC General Partner
By:	/s/ Joseph F. Lawler
	Name:	Joseph F. Lawler
	Title:	Managing Member

JFL CAPITAL MANAGEMENT LP
By:	JFL Capital Holdings LLC General Partner
By:	/s/ Joseph F. Lawler
	Name:	Joseph F. Lawler
	Title:	Managing Member

JFL CAPITAL HOLDINGS LLC
By:	/s/ Joseph F. Lawler
	Name:	Joseph F. Lawler
	Title:	Managing Member

JFL CAPITAL MANAGEMENT LLC
By:	/s/ Joseph F. Lawler
	Name:	Joseph F. Lawler
	Title:	Managing Member

/s/ Joseph F. Lawler

JOSEPH F. LAWLER