Paris - France's financial market regulator slapped on Thursday a €950 000 fine on Aviva Investors France.
The AMF found that the company had failed to respect a rule that requires identifying which portfolio a share will be placed in before a sales order is placed.
It called "intrinsically serious" this fault of a rule meant to avoid conflicts in the event the price later varies, according to copy of the ruling.
It had also found shortcomings in its record-keeping of trades and internal controls.
Aviva Investors France indicated it would not appeal the ruling.
The company, part of the British insurance group Aviva, could not be immediately contacted to comment on the fine.