(Bloomberg) -- The biggest shareholder in Thames Water wrote off the entire value of its stake in the latest sign of the utility’s desperate financial situation.Most Read from BloombergChina Attempts to End Property Crisis With Broad Rescue PackageWith a BlackRock CEO, $9 Trillion Vanguard Braces for TurbulenceUS Inflation Data Was Accidentally Released 30 Minutes EarlyPutin and Xi Vow to Step Up Fight to Counter US ‘Containment’Jamie Dimon Sees ‘Lot of Inflationary Forces in Front of Us’Thames