He has been replaced on UK growth by Trevor Green, who already manages the equity portion of the managed distribution fund and select opportunities fund.
The firm is searching for a new CIO and is in discussions with candidates.
It has also announced a number of fund mergers .The hidden value fund is to merge with the UK alpha fund under Tim Steer”s management, as previously tipped by Money Marketing.
The monthly income unit trust is to merge with the managed distribution fund under the leadership of Green, with the option of monthly income preserved. The European leaders fund is to merge with the European value fund managed by Nick Sheridan.
Chairman John Duffield says: “Our overwhelming priority in making these changes is to improve investment performance. I recognise that we have been too slow in some of our funds in adjusting to the sustained falls in securities markets.”
Hargreaves Lansdown investment manager Ben Yearsley investment says: “It is a good start but getting rid of one manager and merging three funds is not necessarily going to sort the problem out.
“Whittaker going was not a surprise, neither was the funds merging as they have got a big range built up from various acquisitions made over time. If the markets carry on as they are, we may well see more people go.”