PDS Biotechnology Corporation entered into a First Amendment to a Promissory Note with YA II PN, Ltd. on August 31, 2026. The amendment modifies a previously issued note with an original principal amount of $6,000,000, dated June 15, 2026.

The agreement includes three primary modifications:

The Amendment becomes effective upon execution and delivery by each party and the Company having paid in full the installment amount due on September 14, 2026.