Henderson's head of global equities, Neil Rogan, has left the firm, Investment Week can reveal.
Henderson Global Investors saw its share price climb in the face of a declining market for the second day running today following rumours of a takeover.
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Henderson Global Investors is raising its dividend after reporting a 58% profits jump in 2011, even with the cost of the Gartmore integration impacting results.
M&G tops both retail sales lists as investors seek out bond funds, while BlackRock's active and passive vehicles also prove popular.
Henderson is to convert its £568m Higher Income fund into a global equity offering, Investment Week understands, as part of a major overhaul of its fund range.
Leading fund managers are favouring US equities over markets including China and Europe as the appeal of owning dollar assets helps spark a shift into the world's largest economy.
Fund management groups and analysts have warned new dividend rules for investment trusts could see shareholders lose out as portfolios become less tax efficient.