Columbia Threadneedle is monitoring capacity in its €1.6 billion (£1.4 billion) Credit Opportunities fund as investors continue to pile in.
Over the last three years the firm has stopped marketing Barrie Whitman's fund and pitch to new clients in a bid to keep control on inflows.
However, it has has continued to attract investors, with assets under management jumping from the €954 million they stood at in April 2016.
This has prompted Columbia Threadneedle to explore further containment measures, which may lead to a soft-closure. The firm did not specify how big the fund would have to be before it employed this measure.
The Credit Opportunities fund, which launched in April 2009, takes long and short positions in both high yield and investment grade credit.
In the three years to the end of March 2017 the fund has returned 5.9% versus a sector average of 2.2%.
A spokesperson for Columbia Threadneedle said the combination of low growth, low interest rate environment, along with Whitman’s good track record had kept demand for the fund high.
‘We are now monitoring new flows with the potential to apply further measures to limit demand if necessary to ensure the investment integrity of the product is retained for existing clients,' the spokesperson added.