Intimation of Earnings Call to be held on July 25, 2026.

Corporate Office: Registered Office: Star 1, Opp IIM Bangalore, Bilekahalli, Cyber One, Unit No. 902, Sector 30A, Bannergha(cid:425)a Road, Bengaluru – Plot No - 4 & 6, Vashi, 560076, India Navi Mumbai - 400703, India T: +91 80 6784 0738 T: +91 22 2789 2924 F: +91 22 2789 2942 Date: July 21, 2026 BSE Limited National Stock Exchange of India Ltd Listing Department- Exchange Plaza, C-1, Block G, Phiroze Jeejeebhoy Towers Bandra Kurla Complex, Dalal Street Bandra (E) Mumbai- 400001 Mumbai – 400 051 Scrip Code: 544292, ISIN: INE013P01021 Symbol: ONESOURCE Dear Sir/ Madam, Subject: Earnings Call to discuss unaudited financial results of the Company for the quarter ended June 30, 2026 This is to inform you that Company has scheduled its Earnings Call with analysts/ investors on Saturday, July 25, 2026, at 10:00 hrs IST to discuss the unaudited financial results of the Company for the quarter ended June 30, 2026. Earnings Call details are enclosed for ready reference. You are requested to kindly take the same on record. 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 OneSource Q1FY27 Earnings Call Saturday, 25th July 2026, 10:00 AM IST OneSource Specialty Pharma Ltd. invites you to interact with the senior management on Q1FY27 earnings. Speakers: Neeraj Sharma, CEO & MD Anurag Bhagania, CFO Conference Call Details Dial in Details: For conference call, Saturday 25th July 2026, 10:00 AM IST Universal Access +91 22 6280 1372 +91 22 7115 8193 DiamondPass https://services.choruscall.in/DiamondPassRegistration/register?conf (for early registration) irmationNumber=1364631&linkSecurityString=b8d37def3