Lynn Blake, CIO of State Street Global Advisors' global equity beta solutions unit, plans to retire on Sept. 30, confirmed Olivia Offner, a company spokeswoman.
John Tucker, currently SSGA's chief operating officer of investments, is to be promoted to replace Ms. Blake. His replacement has not yet been named, Ms. Offner said in an interview.
Ms. Blake joined SSGA in 1987 and assumed her current role in 2011.
She was "instrumental in creating, developing and managing many of the world's earliest index funds," a company statement said.
Under Ms. Blake's leadership, the GEBS unit now manages more than 1,400 funds and ETFs with assets of more than $2.3 trillion in all-equity index and smart beta strategies as of March 31, according to the statement.
Separately, Karen Wong is to join SSGA as global head of environmental, social and governance and sustainable investments June 14.
The position is new, Ms. Offner said.
In addition to overseeing the equity beta unit, Ms. Blake also "has been a key player in growing State Street Global Advisors' ESG and stewardship capabilities," the release said, noting that these areas are report to Ms. Wong.
Ms. Wong was managing director and head of index portfolio management at Mellon Investments. She left the firm in December according to her LinkedIn profile.
Stephanie Hill, also a Mellon Investments managing director, replaced Ms. Wong with the title of head of index in September.
"We feel confident that we have two exceptional leaders to take forward the great work Lynn has done, both in GEBS overall and with our ESG and stewardship programs," said Lori Heinel, SSGA's global CIO, in the news release.
SSGA managed a total of $3.59 trillion as of March 31.