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Janus Henderson discloses stakes in Vesuvius and RHI Magnesita

Janus Henderson filed Rule 8.3 Takeover Code disclosures: a stake of about 3.14% in Vesuvius and 0.08% in RHI Magnesita.

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what happened

Janus Henderson Group Ltd disclosed its holdings in two British companies under Rule 8.3 of the Takeover Code, in a notice published by Vesuvius plc. As of November 5, 2026, the fund held 7,784,540 Vesuvius shares, or 3.14% of the capital. On the same day it sold 3,862 shares at GBP 4.62 each.

A second notice, distributed by Reuters, concerns RHI Magnesita N.V. The group holds 37,685 shares there, or 0.08%, and on November 5 it bought 32,706 shares at GBP 27.994305 each. Both forms are dated November 6, 2026, and both report dealings from the previous trading day.

why it matters

Such filings are required from investors whose stake in a company exceeds 1%, and they do not add new information about corporate events. The trade sizes are small for the market, but the disclosures matter because they show a large investor is active in both stocks during a takeover situation. Traders may want to follow later filings to see how the ownership structure changes.

market impact

Vesuvius and RHI Magnesita: a large holder is changing its positions, with limited effect on prices

tags

StockUnited KingdomInsider Dealing

instruments

VesuviusRHI Magnesita

on polymarket

Vesuvius eruption with 1+ VEI in 2026?6.4%

sources

  1. REG - Janus Henderson Inv. Vesuvius plc - Form 8.3 — Vesuvius plc, 6 November 2026 at 14:31 UTC
  2. REG - Janus Henderson Inv. RHI Magnesita N.V. - Form 8.3 - RHI Magnesita N.V. — Reuters, 6 November 2026 at 14:30 UTC
  3. REG - American Century Inv Vesuvius plc - Form 8.3 — Vesuvius PLC, 6 November 2026 at 14:38 UTC
  4. REG - BlackRock Group Vesuvius plc - Form 8.3 — Vesuvius plc, 6 November 2026 at 15:20 UTC

prepared by the newsmetry newsroom with ai assistance from the sources listed below. not investment advice.

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