Form 8.3 Disclosure: Vanguard's Stake in Vesuvius PLC

The Vanguard Group, Inc. has issued a Form 8.3 disclosure concerning its stake in Vesuvius PLC. As of October 2, 2026, Vanguard holds 4.40% of Vesuvius's 10p ordinary shares, totaling 10,911,198 shares. This disclosure is in line with the UK's Takeover Code Rule 8.3, which mandates public disclosures by entities with stakes representing 1% or more of a company's relevant securities.

No cash-settled or stock-settled derivatives held by Vanguard have been reported, and no new rights to subscribe exist. Recent transactions include the sale of 774 securities at 4.52 GBP per unit. Vanguard also discloses holdings in RHI Magnesita N.V. No indemnity, option arrangements, or voting agreements exist, and no supplemental open positions form is attached.