EQS — News: Heidelberg Pharma Reports on the First Nine Months of Financial Year 2026

2026 / 07:05 CET/CEST The issuer is solely responsible for the content of this announcement.

══════════════════════════════════════════════════════════════════════════ Heidelberg Pharma Reports on the First Nine Months of Financial Year 2026 • Phase IIa trial in multiple myeloma at the recommended Phase II dose (RP2D) of 175 µg/kg proceeding as planned • NMPA approval for clinical trial of pamlectabart tismanitin (HDP-101) combination therapy in China • Additional collaboration agreement signed with Huadong Medicine to jointly develop new Antibody Drug Conjugates • New preclinical and clinical data presented at scientific meetings • Financial figures in line with planning; Sales revenue and other income increased by 79% compared to previous year and cost reduction program successfully implemented with total cost savings of roughly 30% Ladenburg, Germany, 15 October 2026 — Heidelberg Pharma AG (FSE: HPHA) reported today on its operational progress as well as on the Group's financial figures for the first nine months of fiscal year 2026 (1 December 2025 — 31 August 2026).

Dr. Dongzhou Jeffery Liu, Chief Executive Officer of Heidelberg Pharma AG, commented: “The first nine months of fiscal year 2026 have been a period of important progress for Heidelberg Pharma. We have advanced the clinical development of our lead project HDP-101 (pamlectabart tismanitin), strengthened our financial position and rebuilt our early ADC pipeline through our strong strategic partnership with Huadong Medicine.

In our lead program pamlectabart tismanitin, we have achieved a development milestone by obtaining the recommended Phase II dose (RP2D) of 175 µg/kg and are currently focused on advancing the clinical Phase IIa study in heavily pretreated multiple myeloma patients in Europe and the United States to generate further clinical data. Patient recruitment is progressing as planned, and we are seeing increased interest from investigators following the demonstration of a favorable safety profile and initial encouraging efficacy data for our Amanitin-based ADC.

We are actively seeking potential partnerships with our three lead assets (clinical or clinical-ready stage) aiming to fast develop these drug candidates and demonstrate the clinical benefits to the cancer patients who need them. ” Peter Willinger, Chief Financial Officer of Heidelberg Pharma AG, commented: “We are convinced that the new collaboration agreement with Huadong will increase our added value and contribute to the future growth of the Company. Next to that our partner programs continue to progress as planned and generated milestone payments in the first nine months.

Together with the royalty financing agreement with HealthCare Royalty and Soleus Capital, this reinforces our solid financial position and supports the confirmation of our 2026 financial guidance. ” Key operational developments within the company and among its partners • Pamlectabart tismanitin (HDP-101) development program: Pamlectabart tismanitin (HDP-101), an Amanitin-based antibody-drug conjugate (ADC) targeting the BCMA antigen, is being tested in a Phase I/IIa open-label, multicenter study for the treatment of relapsed or refractory multiple myeloma, a cancer of the bone marrow.

The Phase I dose escalation part of the clinical study was completed in April 2026, after treating ten patient cohorts across a dose range of 20 to 218 µg/kg. Heidelberg Pharma’s Benefit and Risk Assessment team agreed with the recommendation of the study’s Safety Review Committee (SRC), which had conducted a comprehensive review of safety, tolerability and pharmacokinetic (PK) data from the ongoing trial, and selected the dose level from Cohort 9 — 175 µg/kg — as Recommended Phase 2 Dose (RP2D). In the Phase I part of the study, 53 patients with relapsed or refractory multiple myeloma (RRMM) were dosed and included in the data analysis.

All patients were heavily pretreated with a median of five prior lines of treatment. Pamlectabart tismanitin was well-tolerated and a maximum tolerated dose was not reached. All adverse events that occurred were reversible, and no treatment related grade 5 events were observed. In clinical Phase 1 study, clinical responses were observed from ≥90 µg/kg, with increasing efficacy at higher doses.

Across Cohorts 5 — 9 (90 -175 µg/kg), the Overall Response Rate (ORR) was 42% (13 out of 31 evaluable patients), including seven partial responses (PR), three very good partial responses (VGPR), and three stringent complete responses (sCR). In Cohort 9 (175 µg/kg), two out of five evaluable patients achieved good response: one PR and one VGPR.

• New preclinical data from the ATAC technology platform presented at the AACR 2026 Annual Meeting: Heidelberg Pharma presented promising preclinical data from its Amanitin-based ADC HDP-103 targeting metastatic castration—resistant prostate cancer (mCRPC) at the American Association of Cancer Research (AACR) Annual Meeting 2026 in April. HDP-103 demonstrated target-specific binding in human tissues and robust and durable antitumor activity in patient-derived xenograft (PDX) models.

The potent anti-tumor efficacy of HDP-103, combined with a favorable half-life and a manageable safety profile, led to a comfortable therapeutic index (TI) of HDP-103 that is well in the range of other ADCs that are approved or in development for solid tumor indications. Taken together, these data warrant further clinical development of HDP-103 as a novel treatment option for mCRPC. • Milestone payment from partner Takeda received: Partner Takeda has started clinical development of its ADC candidate (TAK-188), which utilizes the Amanitin-based ADC technology licensed from Heidelberg Pharma.

With the dosing of the first patient in a Phase I/II clinical trial in patients with advanced or metastatic solid tumors, an agreed-upon development milestone was reached in January, triggering a payment to Heidelberg Pharma. Financial details were not disclosed. • Milestone payment from partner Huadong received, programs on track: Strategic partner Huadong Medicine dosed the first patient in a clinical trial with pamlectabart tismanitin in China in March, hereby achieving an agreed-upon development milestone that triggered a payment to Heidelberg Pharma.

The Phase I clinical trial will evaluate the safety, tolerability, pharmacokinetics and efficacy of pamlectabart tismanitin in Chinese patients with plasma cell disorders, including multiple myeloma. This bridging study is conducted in addition to the existing clinical program with this ATAC to ensure comparability of safety and efficacy across different populations. Dosing has been initiated at 140 µg/kg, a dose level previously shown to be safe and well tolerated in the Caucasian ethnicity.

Furthermore, at the end of August it was announced that the China National Medical Products Administration (NMPA) has granted Clinical Trial Approval for a Phase Ib/II clinical trial evaluating pamlectabart tismanitin in combination therapy for the treatment of patients with relapsed/refractory multiple myeloma. This trial will evaluate the safety, tolerability, and preliminary efficacy of pamlectabart tismanitin in combination either with pomalidomide and dexamethasone, or with daratumumab and dexamethasone, in adult patients with relapsed/refractory multiple myeloma who have received at least one prior line of therapy.

The trial will be conducted by Heidelberg Pharma’s partner Huadong Medicine in China who will bear the development cost. • Additional collaboration agreement signed with Huadong Medicine to jointly develop new Antibody Drug Conjugates: Heidelberg Pharma and Huadong Medicine have broadened their existing partnership through joint research and development of new ADCs involving up to six targets. Under the agreement, the parties will combine and leverage their complementary technologies, expertise, and resources. This includes Heidelberg Pharma’s proprietary ATAC technology platform and other novel toxin payloads, together with Huadong’s state-of-the-art R&D capabilities.

The partnership aims to create synergies and drive the development of innovative next-generation ADCs, including bispecific and multispecific ADCs. The new ADCs may incorporate proprietary antibodies or technologies from Huadong Medicine and may carry dual payloads. This combination is designed to improve the targeting precision and safety of the drugs, while enhancing biological efficacy and clinical benefits, thereby offering potentially transformative therapeutic options for patients with relapsed/refractory diseases.

The agreement foresees that ownership of the resulting development candidates will be allocated between the partners, taking into account their respective contributions. P. (Soleus Capital), was signed. The amended agreement covers the partial monetization of Heidelberg Pharma’s future royalty payments from the global sale of Telix’s diagnostic imaging agent TLX250-Px (proposed trade name: Zircaix^®).

In connection with the amendment, Heidelberg Pharma received USD 20 million from Soleus Capital upfront. An additional payment of USD 25 million from Soleus Capital will be due upon FDA approval of TLX250-Px. As part of the current contract extension, Heidelberg Pharma has agreed to an increase in the cap on total payments as well as certain other contractual amendments. Soleus Capital’s participation has no impact on the payment from HCRx upon FDA approval.

• Change in Executive Management Board: Chief Financial Officer Walter Miller left the Company at the end of April 2026 upon expiration of his contract and at his own request. Peter Willinger succeeded him as Chief Financial Officer effective 1 May 2026.

Events after the end of the reporting period • New clinical data on pamlectabart tismanitin (HDP-101) presented at International Myeloma Society Annual Meeting 2026: At the Annual Meeting of the International Myeloma Society (IMS) in Glasgow, United Kingdom, in mid-September, Professor Marc Raab, Head of the Heidelberg Myeloma Center at Heidelberg University Hospital, Germany, presented new clinical data from ten patient cohorts in the ongoing study evaluating pamlectabart tismanitin in multiple myeloma. In cohorts 9 and 10, pamlectabart tismanitin consistently demonstrated a very good safety and tolerability profile.

In Cohort 9 (175 µg/kg), encouraging signs of clinical efficacy were seen as two out of five evaluable patients achieved good response: one PR and one VGPR. Results of operations, financial position and net assets The Heidelberg Pharma Group, as of the reporting date consisting of Heidelberg Pharma AG and its three subsidiaries Heidelberg Pharma Research GmbH, HDP G250 AG & Co. KG, and HDP G250 Beteiligungs GmbH, reports consolidated figures. The two latter companies are not operationally active and affiliated to the parent company like Heidelberg Pharma Research GmbH.

The reporting period referred to below relates to the period from 1 December 2025 to 31 August 2026 (9M 2026). 4 million). 4% and is in line with the planning. 3 million due to milestone payments from partners.

4 million). 2 million), reflecting the restructuring and disciplined cost management. 2 million) because of material deliveries to partners and corresponds to 9% of total costs. 0 million).

7% reflects the Company’s focus on the leading clinical program. R&D costs continue to represent the largest cost item, accounting for 67% of operating expenses. 0 million), which is mainly due to lower personnel costs. Administrative costs account for 21% of operating expenses.

7 million and represented 3% of operating expenses. 7 million). The decrease is attributable to a lower investment volume and lower interest rates. 1 million.

8% improvement was mainly driven by higher revenues and lower operating expenses. 19 in the reporting period. 9 million). 8 million outflow).

1 million). 9 million). Financial outlook for 2026 Heidelberg Pharma confirms the full-year financial guidance issued on 26 March 2026. 0 million in sales revenue and other income in the 2026 fiscal year.

0 million. In addition, Heidelberg Pharma assumes that over the next few years total expenses will continue to exceed income. 4 million). 0 million.

0 million). The Group’s financing is secured at least until mid-2027 based on current internal planning. The complete set of figures for the interim financial statements is available at 1 "Press & Investors > Announcements and Reports > Financial Reports > Interim announcement of 15 October 2026”. A conference call on this interim announcement will not be offered.

Key figures for the Heidelberg Pharma Group 9M 2026 ^1 9M 2025 ^1 In EUR thsd. EUR thsd. EUR thsd. 7 Employees (number) Employees as of the end of the period^3 35 126 Full-time equivalents as of the end of the period^3 33 114 1 The reporting period begins on 1 December and ends on 31 August.

2 Equity / total assets 3 Including members of the Executive Management Board Rounding of exact figures may result in differences. eu Wallstadter Straße 59, 68526 Ladenburg About Heidelberg Pharma Heidelberg Pharma is the first company to develop cancer therapies using Amanitin, a compound derived from the green death cap mushroom.