Celia Evans has been at the Burscough, West Lancs, firm since 2007 and achieved chartered status earlier this year.
She will add compliance to her existing areas of responsibility at the firm which now employs 17 staff.
Just under a year ago Acumen expanded north with the takeover of Wyre Investment and Financial Management in Pilling.
Company founder Angela Maher was featured in The Times’ Top Rated Financial Advisers for the third year.
Jon Landy, director, at Acumen said: “As the business moves forward into its next phase of growth, Celia’s expert advice as part of the management team will be key.
“Acumen now has a team of 17 and we are confident that the company is well equipped to face any challenges ahead.”
Formed in 2006, Acumen has a team of 17 staff, including eight qualified financial advisers.