Disclosure under Regulation 30A of SEBI (LODR) - Amendment of the Share Purchase Agreement

Date: October 23, 2026 BSE Limited Na(cid:415)onal Stock Exchange of India Limited The Corporate Rela(cid:415)ons Department, Exchange Plaza, Bandra-Kurla Complex, 25th Floor, Phiroze Jeejeebhoy Towers, Bandra (East), Mumbai 400 051 Dalal Street, Mumbai - 400 001 Stock Code – KRONOX Stock Code – 544187 Subject: Disclosure under Regula(cid:415)on 30 read with Schedule III of SEBI (Lis(cid:415)ng Obliga(cid:415)ons and Disclosure Requirements) Regula(cid:415)ons, 2015 (“Lis(cid:415)ng Regula(cid:415)ons”) and SEBI Master Circular no. HO/49/14/14(7)2025-CFD-POD2/I/3762/2026 dated January 30, 2026 (“SEBI Master Circular”) – Amendment of the Share Purchase Agreement Dear Sir/ Madam, We refer to the earlier in(cid:415)ma(cid:415)ons dated August 20, 2026 and September 29, 2026 in(cid:415)ma(cid:415)ng you about execu(cid:415)on of a share purchase agreement on August 20, 2026 (“SPA”) between Indo Borax and Chemicals Limited (“Purchaser”), Mr. Ketan Vinodchandra Ramani, Mr. Pritesh Vinodchandra Ramani, Mr. Jogindersingh Gianchand Jaswal (together, the “Sellers”) and Zenrock Chemicals Private Limited for the sale of up to 2,38,44,000 equity shares (“Sale Shares”) held by the Sellers (in aggregate) in Kronox Lab Sciences Limited (“Company”), cons(cid:415)tu(cid:415)ng 64.26% of the total paid-up equity share capital of the Company. We would like to inform you that the Company has today received in(cid:415)ma(cid:415)on from the Sellers and the promoter regarding an amendment to the SPA (“Amendment Agreement”). Details of the Amendment Agreement as received from the Sellers and the promoter in terms of Regula(cid:415)on 30A read with Paragraph 5A of Paragraph A of Part A of Schedule III of SEBI LODR Regula(cid:415)ons read with the SEBI Master Circular are enclosed herewith as the Annexure I. We request you to take this informa(cid:415)on on record. Thanking you, Yours faithfully, For Kronox Lab Sciences Limited Nikhil Goswami Company Secretary & Compliance Officer M. No. A68272 Annexure I Disclosure under Regula(cid:415)ons 30 read with sub- paragraph 5A of Para A of Part A of Schedule III of the SEBI LODR Regula(cid:415)ons read with the SEBI Master Circular Sr. Particulars Details 1. If the listed en(cid:415)ty is a party to the Not applicable, as Kronox Lab Sciences Limited agreement, (“Company”) is not party to the Agreement. (i) details of the counterpar(cid:415)es (including name and rela(cid:415)onship with the listed en(cid:415)ty); 2. If listed en(cid:415)ty is not a party to the (i) Indo Borax & Chemicals Limited agreement, (“Purchaser”) and Zenrock Chemicals (i) name of the party entering Private Limited (“ZCPL”), where the into such an agreement and Purchaser holds an aggregate shareholding the rela(cid:415)onship with the of 64.26% of the total paid-up equity share listed en(cid:415)ty; capital of the Company. On and from (ii) details of the September 29, 2026, the Purchaser has counterpar(cid:415)es to the become the promoter and ZCPL has agreement (including name become a member of the promoter group and rela(cid:415)onship with the of the Company. listed en(cid:415)ty); (ii) Mr. Ketan Vinodchandra Ramani, Mr. (iii) date of entering into the Pritesh Vinodchandra Ramani, Mr. agreement. Jogindersingh Gianchand Jaswal (together, the “Sellers”), where the Sellers collec(cid:415)vely hold an aggregate shareholding of 9.95% in the share capital of the Company. The Sellers are the erstwhile promoters of the Company. (iii) The Amendment Agreement is entered into on October 22, 2026. 3. Purpose of entering into the Please refer to the details given in Sr. No. 12. agreement 4. Shareholding, if any, in the en(cid:415)ty Not applicable, as the Sellers do not have any with whom the agreement is shareholding in any of the par(cid:415)es to the executed. Amendment Agreement. 5. Significant terms of the agreement The Amendment Agreement deletes Clause 9.5 (in brief) (Lock-in on Sellers’ Shareholding) and Clause 9.6 (Right of First Refusal) of the SPA in their en(cid:415)rety, such that the Sellers’ shares will no longer be subject to any lock-in and the Purchaser will no longer hold a right of first refusal over the Sellers’ retained shareholding. 6. Extent and the nature of impact on Not applicable. management or control of the listed en(cid:415)ty; 7. Details and quan(cid:415)fica(cid:415)on of the None. restric(cid:415)on or liability imposed upon the listed en(cid:415)ty; 8. Whether, the said par(cid:415)es are The Sellers have ceased to be the promoter or related to promoter/promoter promoter group of the Company whereas the group/ group companies in any Purchaser and ZCPL are members of the promoter / manner. If yes, nature of promoter group of the Company on and from rela(cid:415)onship September 29, 2026. 9. Whether the transac(cid:415)on would fall The Amendment Agreement does not cons(cid:415)tute a within related party transac(cid:415)ons? If related party transac(cid:415)on. yes, whether the same is done at “arm’s length” 10. In case of issuance of shares to the Not applicable. par(cid:415)es, details of issue price, class of shares issued 11. Any other disclosures related to Not applicable. such agreements, viz., details of nominee on the board of directors of the listed en(cid:415)ty, poten(cid:415)al conflict of interest arising out of such agreements, etc. 12. In case of rescission, amendment or (a) The Purchaser, Sellers and ZCPL. altera(cid:415)on, listed en(cid:415)ty shall disclose (b) The Amendment Agreement is an amendment addi(cid:415)onal details to the stock to the share purchase agreement dated August exchange(s): 20, 2026 (“SPA”), entered into between the Purchaser, the Sellers and ZCPL. (a) name of par(cid:415)es to the (c) The Amendment Agreement has been executed agreement; on October 22, 2026. (b) nature of the agreement; (d) The SPA has been amended vide the (c) date of execu(cid:415)on of the Amendment Agreement dele(cid:415)ng Clause 9.5 agreement; (Lock-in on Sellers’ Shareholding) and Clause 9.6 (d) details and reasons for (Right of First Refusal) in their en(cid:415)rety, such that amendment or altera(cid:415)on and the Sellers’ shares will no longer be subject to impact thereof (including any lock-in and the Purchaser will no longer impact on management or hold a right of first refusal over the Sellers’ control and on the restric(cid:415)on or retained shareholding. liability quan(cid:415)fied earlier); (e) reasons for rescission and (e) Not applicable. impact thereof (including impact on management or control and on the restric(cid:415)on or liability quan(cid:415)fied earlier).