Announcement PDF Monthly Report May 2026 Rivco Australia Limited (ASX:RIV) 1 SHARES ON ISSUE: 158,512,171 GROSS ASSETS: $307 million Net Asset Value (Pre-tax) $1.76 per share (unaudited) Net Asset Value (Post-tax) $1.59 per share (unaudited) Closing Share Price $1.43 per share Southern Basin Dam Storages – 31 May 2026 Dartmouth Hume Eildon Blowering Burrinjuck Menindee Average* Current Month 65% 24% 41% 30% 39% 33% 41% Previous Month 65% 22% 41% 23% 38% 33% 40% Previous Year 72% 28% 59% 40% 43% 64% 53% MARKET CAP: $227 million * Weighted Average Key Highlights • Pre-tax NAV increased by 1 cent per share during the month, reflecting a modest increase in the value of several lower Murray entitlements. • From 1 July 2026, 82% of the portfolio will be leased. These lease contracts are expected to generate approximately $10.6 million of lease revenue in the 2026/27 water year. • Market activity slowed toward the end of the water year, with the Company focused on preparing its portfolio for the 2026/27 water year. • The outlook for the next season remains dry, with state water resource managers forecasting opening allocations on higher reliability entitlements to be below average. • The Company’s listed bonus options, which were issued to eligible shareholders in 2023, expired on 10 May 2026. The Company no longer has any options on issue. Portfolio Snapshot This announcement has been authorised for release by the Chairman of Rivco Australia Limited (“Rivco” or “the Company”). This document contains summary informationabout Rivco, its subsidiaries and their respective activities current as at the date of this document unless otherwise stated. This document does not contain all the informationabout Rivco's assets and liabilities, financial positionand performance, profits and losses and prospects and does not purport to be complete or comprise all information whichis relevant to an investment decision or that would be required in a prospectus or product disclosure statement prepared in accordance with the requirements of the Corporations Act 2001 (Cth). This document should be read in conjunctionwith Rivco's other periodic and continuous disclosure announcements lodged with ASX which are available at www.asx.com.au. The release, publication or distribution of this document (includingan electronic copy) outside of Australia may be restricted by law. This document may contain forward looking statements, includingstatements regarding Rivco's intentions, beliefs or current expectations about its business and operations, and market conditions. Forward looking statements are provided as a general guide only and should not be relied upon as an indication orguarantee of future performance. This document does not constitute investment, tax, legal or any other form of advice or recommendation andwas prepared without regard to the specific objectives, financial situation or needsof any particular person. Before making an investment decision, you should make your own enquiries and investigations and obtain your own professional advice. Lachlan Campbell Executive Manager - Corporate lachlan.campbell@rivco.com.au +61 410 107 158 Lachlan Beech Executive Manager – Portfolio & Trading lachlan.beech@rivco.com.au +61 414 742 197 Contact Details 82% LEASED % FROM 1 JULY 2026 60.8 GL WATER ENTITLEMENTS 52% % OF PORTFOLIO LEASED (CURRENT) 2.9 yrs WEIGHTED AVERAGE LEASE EXPIRY (WALE) 7.4% DIVIDEND YIELD (GROSS)1 5.2% DIVIDEND YIELD (CASH)2 1. Calculated as the cash dividends paid over the previous12 months,grossed up for franking credits, divided by the EOM share price. 2. Calculated as the cash dividends paid over the previous12 months,divided by the EOM share price (relevantfor non-residentinvestors). Awarded Allocation Percentages – 1 June 2026 Goulburn VIC Murray NSW Murray Murrumbidgee SA Murray High Security 81% 100% 97% 95% 100% General Security* 0% 0% 22% 32% N/A *GeneralSecurityentitlements in NSW share similar characteristicsto Low Reliabilityentitlementsin Victoria.