Calculation agent determination in respect of a Benchmark Rate Replacement Event - IMRP4 Investec Bank (Mauritius) Limited Incorporated in the Republic of Mauritius Company Registration number 8752/3362 Business Registration number C09008752 JSE Share Code: IMRP4 JSE Issuer Share Code: IVES ISIN: MU0455S00032 LEI Number: 213800VEN92NOOOJF520 (the “Issuer”) CALCULATION AGENT DETERMINATION IN RESPECT OF A BENCHMARK RATE REPLACEMENT EVENT AS CONTEMPLATED IN ITEM 64 OF THE APPLICABLE PRICING SUPPLEMENT OF THE IMRP4 PROGRAMME PREFERENCE SHARES Programme Preference Shareholders are hereby advised that, in accordance with the provisions of item 64 of the Applicable Pricing Supplement in respect of the IMRP4 Programme Preference Shares, the Calculation Agent has determined that 1) a Benchmark Rate Replacement Benchmark Event has occurred in that USD LIBOR has been discontinued; and 2) the Replacement Benchmark Rate will, with effect from and including 31 August 2023, be Term SOFR plus the Credit Adjustment Spread plus the Margin. For these purposes the following definitions will be applicable: "SOFR" means the secured overnight financing rate (SOFR) administered by the Federal Reserve Bank of New York (or any other person which takes over the administration of that rate) published (before any correction, recalculation or republication by the administrator) by the Federal Reserve Bank of New York (or any other person which takes over the publication of that rate). If, for whatever reason, Term SOFR is not published on the rate setting date as stated above, then the rate used will be that as published by the relevant administrator/website for the first preceding Business Day, for which such rate was published on such administrator’s website so long as such first preceding Business Day is not more than five (5) Business Days prior to the rate setting date; “Term SOFR” means, in relation to a Dividend Period, the forward-looking term SOFR administered by CME Group Benchmark Administration Limited (or any other person which takes over the administration of that rate) for a period of 3 months, as published by CME Group Benchmark Administration Limited (or any other person which takes over the publication of that rate) as of 6:00 a.m. (New York City time) on the relevant Dividend Rate Determination Date (before any correction, recalculation or republication by the administrator); “Credit Adjustment Spread” means 0.26161%, being the fixed spread adjustment announced by the International Swaps and Derivatives Association, Inc in respect of 3 month USD LIBOR; “Dividend Rate Determination Date(s)” means two (2) Business Days before the first day of the Dividend Period; “Relevant Screen page and Reference Code” means CME Term SOFR 3 Month published on Bloomberg page TSFR3M Index”; and “Relevant Time” means 6:00.am New York City time An amended and restated Applicable Pricing Supplement (the “Amended and Restated Applicable Pricing Supplement”) will be issued by the Issuer to document the above amendments. The Amended and Restated Applicable Pricing Supplements are available for inspection at the registered offices of the Issuer and on the Issuer’s website at: https://www.investec.com/en_mu/legal/mu/medium-term-note-and-preference-share- programme.html By order of the board P Jeewooth Company Secretary Investec Bank (Mauritius) Limited 21 August 2023 Sponsor: Investec Bank Limited Date: 21-08-2023 04:45:00 Produced by the JSE SENS Department. The SENS service is an information dissemination service administered by the JSE Limited ('JSE'). The JSE does not, whether expressly, tacitly or implicitly, represent, warrant or in any way guarantee the truth, accuracy or completeness of the information published on SENS. The JSE, their officers, employees and agents accept no liability for (or in respect of) any direct, indirect, incidental or consequential loss or damage of any kind or nature, howsoever arising, from the use of SENS or the use of, or reliance on, information disseminated through SENS.