Letter providing Web-link for accessing the Integrated Annual Report for the FY 2025-26 along with 66th AGM Notice

HINDUSTHAN INSULATORS & INDUSTRIES LIMITED THE HINDUSTHAN GROUP® (Formerly known as HINDUSTHAN URBAN INFRASTRUCTURE LIMITED) Date: August 13, 2026 The Listing Department, BSE Limited, Phiroze Jeejeebhoy Towers, Dalal Street, Mumbai- 400001 Scrip Code: 539984 Sub: Intimation under Regulation 30 of SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015 - Letter providing Web-link for accessing the Integrated Annual Report for the Financial Year 2025-26 Pursuant to Regulation 36(1)(b) of the SEBI (Listing Obligations and Disclosure Requirements), 2015, a letter providing the weblink including the exact path, where complete details of the Integrated Annual Report for the financial year 2025-26 can be accessed on the Company’s website is being sent to those Members whose e-mail addresses are not registered with the Company/Registrar and Transfer Agent (RTA)/Depository Participants (DPs) as on Friday, August 07, 2026. A copy of the letter is enclosed herewith. The same is for your information and records. Thanking you, Yours Faithfully, For Hindusthan Insulators & Industries Limited (Neha Kejriwal) Company Secretary & Compliance Officer M. No: F12381 Enc.l as above Regd. Office: Kanchenjunga (7th Floor) 18, Barakhamba Road, New Delhi -110 001 CIN : L31300DL1959PLC003141 Contact: +91-11-23310001, 02, 04 & 05 I Email: hiil@hindusthan.co.in, investors@hindusthan.co.in I Website: www.hindusthaninsulators.com Insulators & Electricals Company: Faridabad Warehouse: Guwahati Warehouse: Gwalior: Bangalore: 1-8, New Industrial Area, 12/1 Milestone, Plot No. lC, Brahamaputra Industrial Area, Sy. No. 194, 195/1 & 196/1, P.B. No. 1, Mandideep-462 045 Delhi Mathura Road, Industrial Park, P.O. Birla Nagar, Kannamangala Village, Bidarahalli (M.P.) Faridabad -121 003 Viii.: Silla, P.O. College Nagar, Gwalior -474 004 Hobli,Bangalore East Taluk, hiil.iec@hindusthan.co.in (Haryana) North Guwahati, (M.P.) Bangalore - 560 115 (Karnataka) hiil.fbdwh@hindusthan.co.in Distt. Kamrup -781 031 (Assam) hiil.gwl@hindusthan.co.in hiil.blr@hindusthan.co.in hiil.gwtwh@hindusthan.co.in HINDUSTHAN INSULATORS & INDUSTRIES LIMITED (formerly known as Hindusthan Urban Infrastructure Limited) CIN: L31300DL1959PLC003141 Registered Office: Kanchenjunga, Seventh Floor, 18, Barakhamba Road, New Delhi, 110001, India Telephone: +91-11-23310001, 02, 04 & 05; Website: www.hindusthaninsulators.com; Email: investors@hindusthan.co.in Ref: Name of Shareholder: Address: Pin Code: Subject: Web-link of the Sixty-sixth (66th) Annual General Meeting Notice and Annual Report of the Company for the Financial Year 2025-26 We are pleased to inform you that the 66th (Sixty-sixth) Annual General Meeting (“AGM”) of Hindusthan Insulators & Industries Limited (‘the Company’) is scheduled to be held on Tuesday, September 08, 2026 at 11:00 a.m. (IST) through Video-Conferencing (“VC”)/ Other Audio-Visual Means (‘OAVM’), to transact the businesses as set out in the Notice convening the AGM forming part of the Integrated Annual Report for the financial year 2025-26. In compliance with Regulation 36(1) of SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015 (“Listing Regulations”), soft copy of the Integrated Annual Report of the Company for the Financial Year 2025-26 including Notice of AGM is being sent by electronic mode to those members of the Company whose e-mail addresses are registered with the Company / Registrar & Share Transfer Agent (RTA) or the Depository Participants (DPs) or Depositories as on Friday, August 07, 2026. The physical copy of Integrated Annual Report will be sent only to those shareholders who shall request for the same. As per the records available with the Company/RTA/DP, your email id is not registered against your demat account/Folio No. Therefore, in accordance with Regulation 36(1)(b) of the Listing Regulations, please find below the web-link including the exact path of the website of the Company where the Notice of the 66th AGM along with the Integrated Annual Report of the Company for the Financial Year 2025-26 is uploaded: Web-link: https://hindusthaninsulators.com/investorrelation.aspx?mpgid=151&pgidtrail=151&catid=8 Path: https://hindusthaninsulators.com/ > Investor Relations> Reports & Other Disclosures>Annual Reports> Annual Report 2025- 2026 The Notice of the 66th AGM and the Integrated Annual Report of the Company for the Financial Year 2025-26 are also available at the website of National Securities Depository Limited (NSDL) at www.evoting.nsdl.com, and on the website of the Stock Exchange i.e. BSE Limited at www.bseindia.com. Key details for the AGM are as under: S. N. Particulars Dates 1. EVEN 140731 2. Record date for Final Dividend Friday, June 19, 2026 3. Cut-off date for e-Voting Tuesday, September 01, 2026 4. E-voting start date and time Friday, September 04, 2026 from 9:00 a.m. (IST) 5. E-voting end date and time Monday, September 07, 2026 at 5:00 p.m. (IST) 6. User ID and Password Refer detailed procedure and instructions given in the Notice of the AGM. We request you to update KYC details and email id by submission of necessary documents to Skyline Financial Services Pvt. Ltd., Registrar & Share Transfer Agent (RTA) at compliances@skylinerta.com or info@skylinerta.com, in case you are holding shares in physical form and to your respective DPs in case you are holding shares in demat mode. Yours sincerely, For Hindusthan Insulators & Industries Limited Sd/- (Neha Kejriwal) Date: August 11, 2026 Company Secretary & Compliance officer Place: New Delhi