DoubleLine Capital and ALPS Advisors topped Strategic Insight's list of fastest growing mutual fund managers in 2012.

According to Strategic Insight, Jeffrey Gundlach’s firm pulled in $22.3 billion in mutual fund assets bringing the firm’s total mutual fund assets to $41.7 billion. ALPS doubled up on its passive mutual fund assets in 2012, bringing its total to $5.8 billion.

“During 2012 fund managers across a wide range of strategies and size benefitted from rapid expansion of their assets and clients’ relationship,” noted Avi Nachmany, Strategic Insight’s Director of Research, in a statement. “In 2013 we expect the range of participating managers to expand further as demand for equity funds increases.”

Ron Redell, President of the DoubleLine Funds Trust, said: “We’re very pleased of the confidence that investors and advisors have placed on us. Growth has been exceptional since we launched in 2010 and advisors have seen the value-add of Jeffrey Gundlach the last two years.”

Last month, DoubleLine raked in another $1 billion in mutual fund assets bringing its total assets to $53 billion, said Redell. However, he added that the firm expects its growth to moderate this year. The firm last month launched a new unit and a trio of funds to bet on equities.