Southern Water supplies water and wastewater services in southern England. Macquarie-managed funds made a majority investment in 2021; a new minority investment by Asterion was announced in June 2026. [1][2]
01 / Behind the name
Who owns Southern Water?
Private · Majority investment in 2021; exact current stake not verified [1][2]
The 2021 majority investment and the June 2026 funding announcement have different dates. Asterion announced an approximately 20% minority investment alongside MAM-managed funds, subject to regulatory approvals. Completion and the resulting exact MAM-managed stake have not been established; the proposed percentage is not recorded as a completed holding. This is selected ownership evidence, not a complete legal parent or shareholder register. Headquarters and parent incorporation have not been separately verified; the location of operations is not treated as proof of either. [1][2]
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 Southern 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.
Majority investment in 2021; exact current stake not verified
Investment disclosures checked ·
The 2021 majority investment and the June 2026 funding announcement have different dates. Asterion announced an approximately 20% minority investment alongside MAM-managed funds, subject to regulatory approvals. Completion and the resulting exact MAM-managed stake have not been established; the proposed percentage is not recorded as a completed holding.
The ownership review has not established a dated UK cash corporation-tax payment. Fund investors, operating businesses and property vehicles can have different reporting scopes; no amount is inferred from the investment disclosure.
United KingdomNot yet verified
UK corporation tax paid
Not yet verifiedCash payment
Southern Water · UK reporting scope not verified Annual reporting period not yet verified
The cited sources establish investment or portfolio information, rather than a dated UK cash payment. The relevant UK tax-paying entity, filed financial period and cash corporation-tax payment have not been separately reconciled in this review. Not verified does not mean that no tax was paid. [1]
These figures have different scopes. They should not be added together or used as a like-for-like tax ranking.