VistaGen Therapeutics (VTGN) SC 13G Vistagen Therapeutics / CITADEL ADVISORS ownership change

EXHIBIT 99.1

JOINT FILING AGREEMENT

The undersigned hereby agree that the Statement on Schedule 13G filed herewith (and any amendments thereto), relating to the Shares of Vistagen Therapeutics, Inc., a Nevada corporation, is being filed jointly with the Securities and Exchange Commission pursuant to Rule 13d-1(c) under the Securities Exchange Act of 1934, as amended, on behalf of each of the undersigned.

This Agreement may be executed in counterparts and each of such counterparts taken together shall constitute one and the same instrument.

Dated October 16, 2023.

CITADEL SECURITIES LLC		CITADEL ADVISORS LLC
By:	/s/ Guy Miller	By:	/s/ Seth Levy
	Guy Miller, Authorized Signatory		Seth Levy, Authorized Signatory
CITADEL SECURITIES GROUP LP		CITADEL ADVISORS HOLDINGS LP
By:	/s/ Guy Miller	By:	/s/ Seth Levy
	Guy Miller, Authorized Signatory		Seth Levy, Authorized Signatory
CITADEL SECURITIES GP LLC		CITADEL GP LLC
By:	/s/ Guy Miller	By:	/s/ Seth Levy
	Guy Miller, Authorized Signatory		Seth Levy, Authorized Signatory
		KENNETH GRIFFIN
		By:	/s/ Seth Levy
			Seth Levy, attorney-in-fact*

^* Seth Levy is signing on behalf of Kenneth Griffin as attorney-in-fact pursuant to a power of attorney previously filed with the Securities and Exchange Commission, and hereby incorporated by reference herein. The power of attorney was filed as an attachment to a filing by Citadel Advisors LLC on Schedule 13G for Allakos Inc. on October 13, 2023.