Liontrust Asset Management's assets under management rose by 9.5% to £10.6bn in the three months to the end of December.
The group had net inflows of £571m in the quarter and £749m for the nine months ended 31 Dec.
Chief executive John Ions said the strong inflows illustrated the excellent foundations the business had built. He said: 'The focus on and assets being invested in sustainable investing continue to increase.
'The Sustainable Investment team has been a significant contributor to the expansion of the business since joining Liontrust at the start of last April, with the AuM it is managing increasing by nearly £500 million to just shy of £3 billion. The Sustainable Investment team's rigorous approach to investing and strong performance track record make it a compelling client proposition.
'Over one year to 31 December 2017, all 10 of the UK-domiciled funds managed by the Sustainable Investment team were in the 1st quartile of their respective IA sectors. Over three years, eight out of the 10 funds were in the 1st quartile.
'We have expanded further our investment teams with the recruitment of David Roberts, Phil Milburn and Donald Phillips.
'This new Global Fixed Income team has a demonstrative track record of adding value to client portfolios and are highly regarded by investors in the UK and continental Europe.
'Donald will be joining David and Phil in February from Baillie Gifford and is a significant addition to the Global Fixed Income team because of his experience, knowledge and insight, particularly of high yield bonds. Having previously worked together at Kames, David and Phil know Donald's strengths and how they complement each other.
'Liontrust does not aim to offer all investment options but the working environment we provide for managers who have strong investment processes has never been more valued by investors.
'A final mention must go to Anthony Cross who on 8 January celebrated 20 years of managing the UK Smaller Companies Fund.
'Continuing to manage the fund for 20 years is a fantastic and rare achievement and is a testament to the robust Economic Advantage investment process.'