Chris Rash will succeed Richard Hextall as MS Amlin's CFO after he retires at the end of September.
Ron Vindivich, Sue Coates and Kelly Killimett have been promoted at Argo.
Kenny Hogg will develop the insurance broker’s Scottish operation and starts work on August 29.
Carey Roberts will join the firm as chief legal officer and corporate secretary following on from Bart Schwartz' retirement from the role.
Former Willis Towers Watson executive Louise Piper will now head up XL Catlin's client and broker team in the UK.
The firm has grown its industry loss warranty team with the appointment of Nicolas Bardon in Bermuda.
Liberty Specialty Markets has brought in Jennifer Wilson Fidelis to work within its global financial risks team.
Jonathan Cole is developing the new operation, which offers a greater range of contingency and disability products.
Insured losses from natural catastrophes dropped to $20bn in the first half of the year, according to Swiss Re's Sigma report.