Onesource Specialty Pharma Limited — Major Shareholding Notification 2026

Jan 28, 2026

Star 1, Opp IIM Bangalore, Bilekahalli, Bannergha�a Road, Bengaluru – 560076, India T: +91 80 6784 0738

Cyber One, Unit No. 902, Sector 30A, Plot No - 4 & 6, Vashi, Navi Mumbai - 400703, India T: +91 22 2789 2924 F: +91 22 2789 2942

==> picture [181 x 20] intentionally omitted <==

Date: 28 January 2026

BSE LimitedPhiroze Jeejeebhoy TowersDalal StreetMumbai- 400001Scrip Code: 544292	National Stock Exchange of India LimitedExchange Plaza, C-1, Block G,Bandra Kurla Complex,Bandra (E)Mumbai – 400 051Symbol: ONESOURCE

Dear Sir/Madam,

• Subject: Disclosure under Regulation 29(2) of the SEBI (Substantial Acquisition of Shares & Takeovers) Regulations, 2011 and Regulation 7(2) of SEBI (Prohibition of Insider Trading) Regulations, 2015.

Promoter entity (Tenshi Pharmaceuticals Private Limited), has purchased 200,000 equity shares of OneSource Specialty Pharma Limited, from the market, on January 28, 2026.

Dear Sir/ Madam,

We are pleased to inform you that M/s. Tenshi Pharmaceuticals Private Limited, a promoter entity of the Company, has acquired 200,000 equity shares representing 0.17% of equity share capital of OneSource Specialty Pharma Limited (the “ Company ”), from the market, on January 28, 2026.

Relevant disclosure as received from Tenshi Pharmaceuticals Private Limited, is attached as below:

• a) Regulation 29(2) of SEBI (Substantial Acquisition of Shares & Takeovers) Regulations, 2011.

• b) Regulation 7(2) of SEBI (Prohibition of Insider Trading) Regulations, 2015.

This is for your information and records.

For OneSource Specialty Pharma Limited

Digitally signed by Trisha A Trisha A Date: 2026.01.28 18:38:50 +05'30'

Trisha A

Company Secretary & Compliance Officer Membership No.: A47635

OneSource Specialty Pharma Limited Formerly Stelis Biopharma Limited info@onesourcecdmo.com | www.onesourcecdmo.com

CIN: L74140MH2007PLC432497

==> picture [171 x 13] intentionally omitted <==

==> picture [458 x 577] intentionally omitted <==

==> picture [412 x 52] intentionally omitted <==

==> picture [171 x 13] intentionally omitted <==

==> picture [435 x 627] intentionally omitted <==

==> picture [412 x 52] intentionally omitted <==

==> picture [171 x 13] intentionally omitted <==

==> picture [500 x 487] intentionally omitted <==

==> picture [414 x 52] intentionally omitted <==

==> picture [174 x 12] intentionally omitted <==

==> picture [456 x 453] intentionally omitted <==

==> picture [410 x 47] intentionally omitted <==

==> picture [35 x 641] intentionally omitted <==

==> picture [385 x 749] intentionally omitted <==

==> picture [12 x 173] intentionally omitted <==

==> picture [35 x 641] intentionally omitted <==

==> picture [395 x 748] intentionally omitted <==

==> picture [12 x 173] intentionally omitted <==

==> picture [35 x 641] intentionally omitted <==

==> picture [360 x 633] intentionally omitted <==

==> picture [14 x 172] intentionally omitted <==