McLintock retired from M&G early last year having served at the firm for 19 years. He also worked at JP Morgan Investment Management, Mercury Asset Management and Edinburgh Fund Managers, which was acquired by Aberdeen Asset Management in 2003.
The permanent role will see him working closely with Neptune’s distribution and senior management teams.
Neptune also confirmed that Charlie Parker has left the firm following a restructuring of his role as head of distribution. He will join Sanlam, working closely with head of wealth John White.
Robin Geffen, founder and CEO of Neptune, said: “Neptune has an exceptionally talented team ready to take on Charlie’s responsibilities and help clients access the very strong performance we have to offer across our fund range.
“We are currently investing in our client investment strategy team to further enhance our service.”
Sanlam has also recruited Paula Eddery, former head of investments at Thomas Miller, as portfolio manager in its London team, and regional manager of its south eastern offices.
Katrina Usher has also joined Sanlam’s financial planning team as regional manager in the north of England. She was previously at AJ Gallagher.
White said: “I am focussed on delivering the best outcomes to our growing client base and bringing the highest quality individuals into our Wealth Division to broaden our reach and appeal to allow us to meet the exacting targets that we have in the business.
“Charlie, Paula and Katrina are huge additions to my leadership team and I look forward to working with them to meet our ambitions.”