Exhibit 99.1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k), as promulgated under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them a Statement on Schedule 13D (including amendments thereto) with regard to the common stock of Electro Scientific Industries, Inc. and further agree that this Joint Filing Agreement be included as an Exhibit to such joint filings. In evidence thereof, the undersigned, being duly authorized, hereby execute this Joint Filing Agreement as of November 11, 2018.

Dated: November 11, 2018

MAGNETAR FINANCIAL LLC

By: Magnetar Capital Partners LP, its Sole Member


By:	/s/ Alec N. Litowitz
	Name:	Alec N. Litowitz
	Title:	Manager of Supernova Management LLC, the General Partner of Magnetar Capital Partners LP

MAGNETAR CAPITAL PARTNERS LP


By:	/s/ Alec N. Litowitz
	Name:	Alec N. Litowitz
	Title:	Manager of Supernova Management LLC, the General Partner of Magnetar Capital Partners LP


SUPERNOVA MANAGEMENT LLC


By:	/s/ Alec N. Litowitz
	Name:	Alec N. Litowitz
	Title:	Manager

/s/ Alec N. Litowitz
Alec N. Litowitz

ELECTRO SCIENTIFIC INDUSTRIES INC SC 13D