Change in Management

Corporate Office: Registered Office: Star 1, Opp IIM Bangalore, Bilekahalli, Cyber One, Unit No. 902, Sector 30A, Bannergha(cid:425)a Road, Bengaluru – 560076, Plot No - 4 & 6, Vashi, India Navi Mumbai - 400703, India T: +91 80 6784 0738 T: +91 22 2789 2924 F: +91 22 2789 2942 Date: July 24, 2026 BSE Limited National Stock Exchange of India Limited Phiroze Jeejeebhoy Towers, Exchange Plaza, C-1, Block G, Dalal Street Bandra Kurla Complex, Mumbai- 400001 Bandra (E) Mumbai – 400051 Scrip Code: 544292 Symbol: ONESOURCE Dear Sir/ Madam, Subject: Changes in Senior Management Personnel (SMP) of the Company – Disclosure under Regulation 30 of SEBI (Listing Obligations and Disclosures Requirements) Regulations, 2015 Pursuant to the requirements of Regulation 30 read with Schedule III of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015 (“Listing Regulations”), we wish to inform changes in the Senior Management Personnel (“SMP”) of the Company, as under Designated as SMP: Preeti Kalra (Head - Human Resources) has been designated as a SMP of the Company effective July 24. 2026. Cessation as SMP: Ravi Kumar (Global Head – Injectables/ Head of Corporate Strategy, Portfolio & SPO), Senior Management Personnel (SMP) of the Company has resigned from his position effective July 24, 2026. Disclosure pursuant to Regulation 30 of the Listing Regulations, read with SEBI Master Circular No. HO/49/14/14(7) 2025-CFD-POD2/I/ 3762/2026, last updated on January 30, 2026, is enclosed herewith as Annexure 1 and Annexure 2 respectively. This is for your information and records. For and on behalf of OneSource Specialty Pharma Limited Trisha A Company Secretary and Compliance Officer Membership Number: A47635 OneSource Specialty Pharma Limited Formerly Stelis Biopharma Limited info@onesourcecdmo.com | www.onesourcecdmo.com CIN: L74140MH2007PLC432497 Corporate Office: Registered Office: Star 1, Opp IIM Bangalore, Bilekahalli, Cyber One, Unit No. 902, Sector 30A, Bannergha(cid:425)a Road, Bengaluru – 560076, Plot No - 4 & 6, Vashi, India Navi Mumbai - 400703, India T: +91 80 6784 0738 T: +91 22 2789 2924 F: +91 22 2789 2942 Annexure – 1 Disclosure pursuant to Regulation 30 of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015, read with Circular No. HO/49/14/14(7)2025-CFDPOD2/I/3762/2026 dated January 30, 2026 Designation of Preeti Kalra as SMP Sl. Particulars Description 1. Reason for change viz. appointment, re- Designated as Senior Management Personnel appointment, resignation, removal, death or otherwise. 2. Date of cessation NA 3. Brief profile in case of appointment  HR leader with 25+ years of experience across Biopharma, Global Development (Not-for-Profit), Public Services, Insurance, GCC and IT  Extensive leadership experience with organizations including Stelis Biopharma, Biocon Biologics, Bill & Melinda Gates Foundation, Serco and Ernst & Young  Expertise in business partnering, talent management, leadership development, organizational transformation, culture, organization effectiveness and change management  Proven track record of enabling business growth by building high-performing teams, strengthening leadership capability and driving organizational effectiveness across Asia-Pacific, Middle East, Africa, Europe and North America 4. Disclosure of relationship between directors Not Applicable (in case of appointment of director) OneSource Specialty Pharma Limited Formerly Stelis Biopharma Limited info@onesourcecdmo.com | www.onesourcecdmo.com CIN: L74140MH2007PLC432497 Corporate Office: Registered Office: Star 1, Opp IIM Bangalore, Bilekahalli, Cyber One, Unit No. 902, Sector 30A, Bannergha(cid:425)a Road, Bengaluru – 560076, Plot No - 4 & 6, Vashi, India Navi Mumbai - 400703, India T: +91 80 6784 0738 T: +91 22 2789 2924 F: +91 22 2789 2942 Annexure – 2 Disclosure pursuant to Regulation 30 of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015, read with Circular No. HO/49/14/14(7)2025-CFDPOD2/I/3762/2026 dated January 30, 2026 Cessation as SMP –Ravi Kumar Sl. Particulars Description 1. Reason for change viz. appointment, re- Ceased to be a Senior Management Personnel consequent to appointment, resignation, removal, death or resignation otherwise. 2. Date of cessation NA 3. Brief profile in case of appointment Not applicable 4. Disclosure of relationship between directors Not Applicable (in case of appointment of director) OneSource Specialty Pharma Limited Formerly Stelis Biopharma Limited info@onesourcecdmo.com | www.onesourcecdmo.com CIN: L74140MH2007PLC432497