Natixis, the French banking group and asset manager, has moved to reassure investors after fears over the bond holdings in some of its funds sent its shares tumbling on June 20.

The €2.4bn Allegro fund, managed by H2O Asset Management, an affiliate of Natixis Global Asset Management, had its rating suspended by Morningstar, the fund analyst, on June 19, because of concerns about “the appropriateness and liquidity” of certain corporate bonds it holds.