BMO GAM is to be rebranded as Columbia Threadneedle Investments this summer.
The former asset management arm of BMO Financial Group was acquired by the parent company of Columbia Threadneedle, Ameriprise Financial, last year for £615mn.
It will be rebranded in July, at which point its fund ranges will be renamed with the prefix CT.
The branding of the BMO investment trust range will be determined separately by the trusts’ boards, and shareholders will be updated in due course.
Nick Ring, chief executive of EMEA at Columbia Threadneedle Investments, said the rebranding marks an “exciting” point in the integration.
He said: “The strong cultural fit between Columbia Threadneedle and BMO GAM (EMEA) was an important consideration in the acquisition and will be further strengthened as we come together under the Columbia Threadneedle brand."
The all-cash transaction adds $124bn (£90bn) of assets under management in Europe, and was completed in November last year.
Columbia Threadneedle said its core business and global growth strategy would be complemented by the acquisition, which would add a "substantial" presence in the European institutional market.
BMO’s EMEA asset management business will increase Columbia Threadneedle’s assets under management to $671bn (£488bn).
Its assets in the Europe, Middle East and Africa region will be expanded to approximately 40 per cent of total assets as a result.
In the US, certain BMO asset management clients will be given the opportunity to move to Columbia Threadneedle subject to client consent.