BDO Stoy Hayward has expanded its Birmingham operation after completing a pull-out from Wolverhampton.
The move is part of the accountancy firm's strategy of building "regional centres of excellence" in key locations.
It sees the number of partners and staff in Birmingham nearly double to more than 270 following the relocation of Wolverhampton partners and staff. The switch was first earmarked last year.
BDO Stoy Hayward managing partner in the Midlands, Martin Palmer, yesterday claimed that as far as clients in the Wolverhampton area were concerned the transfer would be "seamless".
He said they would benefit from the resources of the expanded Birmingham business centre.
"They will also continue to have access to BDO Stoy Hayward's excellent network of contacts and services in the growing Birmingham professional sector," he said.
He added: "BDO Stoy Hayward enjoyed significant growth across all of its service streams throughout 2005, particularly in the corporate finance and taxation fields."
No jobs are affected by the move and BDO says it "continues to expand and recruit talented people", citing a growing client portfolio in the Midlands.
BDO Stoy Hayward is the UK member firm of BDO International, the world's fifth largest accountancy network.