Certificate under SEBI (Depositories and Participants) Regulations, 2018

October 5, 2026 To To BSE Limited, National Stock Exchange of India Ltd, 1st Floor, New Trading Ring, Exchange Plaza, Rotunda Building, P.J. Towers, Bandra (East), Dalal Street, Mumbai - 400001 Mumbai - 400051, Maharashtra, India Maharashtra, India BSE Code: 500313 NSE Symbol: OILCOUNTUB Dear Sir/Madam, Sub: Certificate under Regulation 74(5) of SEBI (Depositories and Participants) Regulations, 2018. Pursuant to Regulation 74(5) of SEBI (Depositories and Participants) Regulations, 2018, we herewith enclose the Certificate received from XL Softech Systems Limited, Registrar and Share Transfer Agent (“RTA”) of the Company for the Quarter ended on 30th September, 2026. Kindly take the same in your records. Thanking you Yours faithfully, for Oil Country Tubular Limited Suryawanshi Vaibhav Suryakant Company Secretary & Compliance Officer ACS: 72171 Date: 03.10.2026 The Company Secretary, Oil Country Tubular Limited. Subject: Confirmation Certificate in the matter of Regulation 74(5) of Securities and Exchange Board of india (Depositories and Participants) Regulations, 2018. Reference: NSDL/CIR/II/5/2019 dated 25th January, 2019. CDSL/OPS/RTA/POLCY/2019/14 dated 25th January, 2019. SEBI vide its letter ref no. MRD/DOP2/DSA2/OW/2019/2498/1 dated 24th January, 2019 Dear Sir/Madam, In reference to the above captioned regulation, We hereby confirm that the securities received from the depository participants for dematerialization during the quarter ended 30th September, 2026 were confirmed (accepted/rejected) to the depositories by us and that securities comprised in the said certificates have been listed on the stock exchange where the earlier issued securities are listed. We hereby also confirm that the security certificates received for dematerialization have been mutilated and cancelled after due verification by the depository participant and the name of the depositories have been substituted in register of members as the registered owner within 30 days. We request you to kindly take note of the above in your records. Thanking You, Yours faithfully, For XL Softech Systems Limited Authorised Signatory