Thames Water Utilities Limited provides water and wastewater services across London, the Thames Valley and the Home Counties. Its ultimate holding company is Kemble Water Holdings Limited, owned by nine institutional shareholders. Thames Water Utilities' head office is in Reading; the holding company's headquarters have not been verified. [2][1][6]
Thames Water's ownership page lists nine parallel shareholders of Kemble: Ontario Municipal Employees Retirement System (OMERS) 31.777%, Universities Superannuation Scheme 19.710%, Infinity Investments SA 9.900%, British Columbia Investment Management Corporation 8.706%, Hermes GPE 8.699%, China Investment Corporation 8.688%, Queensland Investment Corporation 5.352%, Aquila GP Inc. 4.996% and Stichting Pensioenfonds Zorg en Welzijn 2.172%. The 2025/26 annual report confirms OMERS as the largest holder. The simplified chain omits intermediate companies and financing vehicles. Kemble's London registered office is not proof of its headquarters; the regulated operator's head office is in Reading. Creditor funding and recapitalisation proposals reported in September 2026 do not establish a completed change of shareholders. [2][1][4][6][7]
Headquarters, incorporation and tax residence describe different things. A headquarters address does not tell you where all of a company’s tax is paid.
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Investors in Thames Water
Investor disclosures found
Selected investor disclosures have been found. Each names the held entity, basis and date; the complete investor register remains outside this review. A stake in a parent or operating company is shown against that entity. Dates refer to each disclosure and can differ from the profile review date. Evidence links are included with each record.
The company lists nine parallel shareholders of the ultimate holding company. The web table supplies no common holding date. Proposed creditor funding or recapitalisation is not a completed shareholder change.
The company lists nine parallel shareholders of the ultimate holding company. The web table supplies no common holding date. Proposed creditor funding or recapitalisation is not a completed shareholder change.
The company lists nine parallel shareholders of the ultimate holding company. The web table supplies no common holding date. Proposed creditor funding or recapitalisation is not a completed shareholder change. Disclosed holder is an Abu Dhabi Investment Authority subsidiary.
The company lists nine parallel shareholders of the ultimate holding company. The web table supplies no common holding date. Proposed creditor funding or recapitalisation is not a completed shareholder change.
The company lists nine parallel shareholders of the ultimate holding company. The web table supplies no common holding date. Proposed creditor funding or recapitalisation is not a completed shareholder change.
The company lists nine parallel shareholders of the ultimate holding company. The web table supplies no common holding date. Proposed creditor funding or recapitalisation is not a completed shareholder change.
The company lists nine parallel shareholders of the ultimate holding company. The web table supplies no common holding date. Proposed creditor funding or recapitalisation is not a completed shareholder change.
The company lists nine parallel shareholders of the ultimate holding company. The web table supplies no common holding date. Proposed creditor funding or recapitalisation is not a completed shareholder change. The named holder is a wholly owned Fiera Infrastructure subsidiary.
The company lists nine parallel shareholders of the ultimate holding company. The web table supplies no common holding date. Proposed creditor funding or recapitalisation is not a completed shareholder change.
Thames Water's 2025/26 report says the operating group is not currently in a cash tax-paying position with HMRC, but does not give a separately reconciled UK cash corporation-tax amount for the year. Its £113.4m consolidated accounting tax charge is mostly deferred tax. The separately reported £225m covers business rates, payroll and other taxes, not a corporation-tax payment.
United Kingdom2025/26
UK corporation tax paid
Not separately disclosedCash payment
Thames Water Utilities Limited group · UK Period ending 31 Mar 2026
The annual report says the group is not currently in a cash tax-paying position with HMRC. Its cash-flow statement has no separately identified corporation-tax payment for the year. The accounting tax charge and payments for group relief or other taxes are not substituted for a dated cash corporation-tax amount or treated as an exact £0. [1]
United Kingdom2025/26
Business rates, payroll and other taxes
£225mTaxes borne + taxes collected
Thames Water Utilities Limited group · UK Period ending 31 Mar 2026
The annual report describes £225m paid in business rates, employer PAYE, employer National Insurance Contributions and other taxes. This mixes tax categories and does not establish a UK cash corporation-tax amount. [1]
These figures have different scopes. They should not be added together or used as a like-for-like tax ranking.