Mansfield has served as chief financial officer since 2022 and as a board member since 2019.

He has held a series of senior executive positions, including chief operating officer and managing director, Nemo.

A member of the society’s board since 2019 and a chartered accountant, his broad remit has included strategy, finance, commercial lending, legal, procurement, change, IT and operations.

He has experience across retail banking, start-ups and private equity-backed consumer financial services business across the UK.

He will succeed Julie‑Ann Haines, who will remain in post until the 20 November, before starting a new position in the summer of 2026.

Principality Building Society chair Simon Moore says: “The Board is delighted to appoint Iain as Principality’s next Chief Executive Officer. His drive and depth of experience is exactly what the Society needs to lead Principality into its next chapter with purpose, pace and clarity.”

“I have no doubt that under his leadership, we will build on our strengths and create long-term value for our Members and the communities we so proudly serve.”

Mansfield adds: “It is an honour and privilege to take the helm of Wales’ largest building society. I am committed to the stewardship of a Society that meets the ever-evolving needs of our Members of today, and those of tomorrow.”

In October, Principality Building Society names Mansfield as new CEO   – Mortgage Strategy

Haines had worked for Principality for 18 years and was appointed to the board in 2016, before leading the business in 2020.