The two fund houses announced a £335.3m takeover deal last week, valuing Gartmore at around 92.1p per share.
The takeover follows a year of turmoil for the beleaguered company; the group floated just over a year ago at 220p per share, before seeing star managers Roger Guy and Guillaume Rambourg leave.
Source: Trustnet. Poll conducted 12-14 January 2010. Respondents numbered 228
But research from Trustnet suggests investors will not be so easily placated. When asked whether they were more inclined to invest in a Gartmore fund now that its future is more secure, more than half of respondents answered "no".
Under the deal, Gartmore's funds will be renamed to take on Henderson's title, but IFAs say Gartmore's reputation will linger.
"You can understand why there is still a reticence to Gartmore funds. There needs to be clarity on amalgamation – until things are settled you can't be 100 per cent assured of the future of the fund you're buying,"
Rowan's head of research Tim Cockerill said. Data from Financial Express shows Gartmore have 31 funds in the IMA UT & OEIC universe, the largest of which is the £1.5bn Gartmore European Selected Opportunities fund run by John Bennett, who took over from Guy and has a 3.18 per cent stake in Gartmore.
He is one of 12 managers who have given the takeover his support. In the past year, Charlie Awdry's Gartmore China Opportunities has returned over 20 per cent to investors, according to Financial Express data.
Performance over 1-yr
Source: Financial Express Analytics