Melda Mergen was named global head of equities at Columbia Threadneedle Investments, a spokesman confirmed in an email.
Effective Oct. 1, she will replace William Davies, who will become global chief investment officer in January, following the retirement of Colin Moore.
Ms. Mergen will lead the firm's global equity investment teams, which manage more than $311 billion in assets. She will also continue to co-manage several large-cap equity strategies when she assumes her new position. Ms. Mergen will continue to report to Mr. Davies when she assumes her new role.
Ms. Mergen is deputy global head of equities. The company will decide on a replacement "in due time," the spokesman said.
Columbia Threadneedle has $564 billion in assets under management.