Mandates include global, U.S., non-U.S., emerging markets, customized funds, factor or risk-based indices and underlying components of target date funds.
The retirement fund also disclosed approximately $1.6 billion in alternatives commitments made in July.
The plan also terminated an emerging markets equity manager in June.
The plan is seeking managers to handle a total of $5.9 billion.
The retirement system replaced its Standard & Poor’s 500 Index Fund manager to cut costs in July.
The deferred compensation plan terminated two equity managers, which had both been on watch due to underperformance, in May.
The plan also terminated three managers last week.
The search will be for index products covering “various strategies with differing fund and account types and across numerous geographies and markets.”
The plan made manager hires this week after introducing new target allocations of 3% each to infrastructure and international small-cap equity.
The plan is relaunching the search after contractual agreement with previously selected did not conclude.