Avacta Group plc

("Avacta" or the "Company")

Accelerated Amortized Payment of Convertible Bond Installment

LONDON and PHILADELPHIA - September 4, 2026 - Avacta Therapeutics (AIM: AVCT), a life sciences company developing innovative, targeted oncology drugs, announces that it has received an accelerated payment notice from the convertible bond holder in respect of the April 2026 quarterly deferred convertible bond repayment, which the Company has elected to settle in cash.  

Accordingly, the Company has settled the accelerated quarterly amortization payment of £2.613 million, representing principal of £2.4 million together with the associated interest and fees payable in the deferment. Following the cash settlement of the April 2026 quarterly deferred convertible bond repayment, both deferred payments have now been satisfied.

After settlement of this deferred quarterly repayment and the July 2026 scheduled payment, both made in cash, the principal remaining under the convertible bond will be reduced to £12.0 million, representing ~3.8% of the market capitalization of the Company.

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About Avacta - https://avacta.com/

Avacta Therapeutics is a clinical-stage life sciences company expanding the reach of highly potent cancer therapies through its proprietary pre|CISION^® platform. pre|CISION^® is a payload delivery system based on a tumor-specific protease (Fibroblast Activation Protein or FAP) that is designed to concentrate highly potent payloads in the tumor microenvironment while sparing normal tissues. Avacta's innovative pre|CISION^® peptide drug conjugates (PDC) are a novel entry to the XDC drug class, leveraging the success of antibody drug conjugates with alternative methods of delivery beyond antibodies.

Our pre|CISION^® PDCs leverage this tumor-specific release mechanism to provide unique benefits over traditional antibody drug conjugates, releasing active payload in the tumor and reducing systemic exposure and toxicity which enables dosing to be optimized to deliver the best outcomes for patients. The lead clinical program is faridoxorubicin (AVA6000), a Gen One FAP-enabled pre|CISION^® version of doxorubicin that delivers the payload directly in the tumor with limited peripheral blood exposure and has demonstrated preliminary activity in tumor types sensitive to doxorubicin including salivary gland cancer and soft tissue sarcoma.

About FAP-Exd (AVA6103)

AVA6103 is the second clinical candidate and is the first asset in the pipeline based on the Gen Two innovative pre|CISION^® sustained release mechanism that provides for prolonged release of payload directly in the tumor, minimizing systemic exposure. AVA6103 is being evaluated in the FOCUS-01 Phase 1 trial (FAP-Exd in Oncologic Cancers with Unmet needS). Preclinical data suggest this approach has optimized payload delivery with a high intratumoral concentration and prolonged exposure of released payload in the tumor, coupled with limited systemic exposure to the released payload. 

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