Exhibit 1

JOINT FILING AGREEMENT

JOINT FILING AGREEMENT, dated as of the 29^th, day of January, 2026, among DynamixCore Holdings III, LLC, and Andrea Bernatova (collectively, the “Joint Filers”).

WHEREAS, pursuant to Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), the parties hereto desire to satisfy any filing obligation under Section 13(g) of the Exchange Act by a single joint filing;

NOW, THEREFORE, in consideration of the premises and the mutual covenants herein contained, the Joint Filers hereby agree and represent as follows:

The Schedule 13G with respect to the Class A ordinary shares, par value $0.0001 per share, of Dynamix Corporation III. (to which this Joint Filing Agreement is an exhibit) is filed on behalf of each of the Joint Filers.

Each of the Joint Filers is eligible to use Schedule 13G for the filing of the information therein contained.

Each of the Joint Filers is responsible for the timely filing of the Schedule 13G and any amendments thereto, and for the completeness and accuracy of the information concerning such person contained therein, provided that each such person is not responsible for the completeness or accuracy of the information concerning the other persons making the filing, unless such person knows or has reason to believe that such information is inaccurate.

IN WITNESS WHEREOF, each of the undersigned has caused this Joint Filing Agreement to be duly executed and delivered as of the date first above written.

	DYNAMIXCORE HOLDINGS III, LLC

	By:	/s/ Andrea Bernatova
	Name:	Andrea Berantova
	Title:	Managing Member

	By:	/s/ Andrea Bernatova
	Name:	Andrea Bernatova

Dynamix Corp III SCHEDULE 13G