In its latest quarterly report Efama revealed that Ireland recorded net inflows of €39bn in the first half, which was €7bn more than the next highest domicile.
The second quarter of the year in Ireland witnessed inflows of €26bn, up 1.5% on the first quarter.
In contrast, all other domiciles experienced decreases in net assets during the second quarter, with total Ucits net assets down 0.5% for the period.
The country’s total market share has now increased to 13%, up from 11.5% in the same period last year.
Gary Palmer, chief executive of the Irish Funds Industry Association, said: "The statistics are not altogether surprising as Ireland has been synonomous with cross-border Ucits since their inception under the 1985 Ucits directive.
"Over the past ten years the net assets of Irish Ucits have grown by 422% – an unbeaten track record."
Meanwhile, total inflows into Ucits amounted to €48bn in the first half of the year, slightly lagging the €55bn posted in the same period in 2010.
Efama said this reduction was due to a stream of events, from the Arab uprisings and the Japanese earthquake, to concerns about sovereign debt risk, which affected investor confidence.