Submission of Intimation of Trading window Closure for the quarter / Half Year ended 30th September 2026

(An ISO 9001 : 2015 Company) Manufacturer of : Liquid & Gaseous Oxygen, Liquid & Gaseous Nitrogen, Liquid & Gaseous Nitrous Oxide, Liquid & Gaseous Medical Oxygen & Dissolved Acetylene Gas Regd. Office : S-1, 2nd Floor, Alsa Mall, New No.4 Old No.149, Montieth Road, Egmore, Chennai - 600 008. Ph : (044) 2852 0096 / 97 / 98 Fax : (044) 2852 0095 E-mail : sales @ nolgroup.com, contact@nolgroup.com, CIN No. L24111TN1974PLC006819 28-09-2026 Department of Corporate Services, Bombay Stock Exchange Limited, 25t Floor,PhirozeJeeJeeBhoy Towers, Dalal Street, Mumbai- 400 001. Dear Sir/Madam, Subject: Intimation of Closure of Trading Window under SEBI (Prohibition of Insider Trading) Regulations, 2015. Pursuant to the provisions of SEBI (Prohibition of Insider Trading) Regulations, 2015, (as amended) and the Company’s Code of Conduct for Prevention of Insider Trading, we wish to inform you that the trading window of the Company will remain closed (for the purpose of consideration of unaudited financial results for the quarter/half year ending on 30 September 2026 along with other matters for which trading window is required to be closed) from Thursday, 01st October 2026 till 48 hours after the announcement/declaration of the unaudited financial results. During the period of Closure of the Trading Window, all directors, Designated Employees, Insiders, and their immediate relatives will not enter into any transaction involving the securities of the Company. The Trading window will open 48 hours after the announcement/declaration of the unaudited financial results for the quarter/year ending on 30t September 2026 to the stock exchanges. The date of the Board Meeting shall be intimated to you separately. Thanking You, Yours faithfully, For NATIONAL OXYGEN LIMITED RAJiiSH KUMAR SARAF MANAGING DIRECTOR —_— @Breathing Life Into Industry FACTORY 1 R.S. No. 126/4 A, Pondy - Villupuram Road, Thiruvandar Koil, Puducherry - 605 102. Phone : (0413) 2640448 Fax : (0413) 2640181 E-mail : nolpondy @nolgroup.com FACTORY 2 : R-5, Sipcot Industrial Growth Centre, Perundurai, Erode - 638 052, Tamilnadu, Ph : (04294) 234145 E-mail : nolperundurai@nolgroup.com FACTORY 3 Plot No.4, Sidco Industrial Estate - Mathur (New) Kainankarai, Mathur - 622515. Pudukottai Dist Mobile : 99400 82462 E-mail : noltr@ inoclghroyup .com