Exhibit A

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with all other Reporting Persons (as such term is defined in the Schedule 13D referred to below) on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to the ordinary shares, par value of $0.0001 per share, of Niu Technologies, a Cayman Islands company, and that this Agreement may be included as an Exhibit to such joint filing. This Agreement may be executed in any number of counterparts, all of which taken together shall constitute one and the same instrument.

IN WITNESS WHEREOF, the undersigned hereby execute this Agreement as of June 12, 2026.

	Glory Achievement Fund Limited


	Signature:	/s/ Xueting Xu
	Name:	Xueting Xu
	Title:	Director

	Bull Group Limited


	Signature:	/s/ LIU Tsz Yin and LUI Chun Lok
	Name:	LIU Tsz Yin and LUI Chun Lok
	Title:	Authorized Signatories

	BULL TRUST


	Signature:	/s/ LIU Tsz Yin and LUI Chun Lok
	Name:	LIU Tsz Yin and LUI Chun Lok
	Title:	Authorized Signatories

Niu Technologies SCHEDULE 13D/A