Fund advisory Triago found shadow commitments are estimated to account for 26% of capital raised this year.
Crown Small Cap Real Estate Fund II, which is targeting $400m, will commit up to 25 percent to secondaries.
The direct secondaries firm focuses on providing capital to founders, executives and employees of venture capital-backed start-ups who seek liquidity.
The state pension plan has invested in two previous Metropolitan funds.
The pension fund's first foray into private equity sees $30m allotted to three secondaries funds.
The listed fund of funds committed to HarbourVest 2015 Global Fund, which also invests in secondaries.
After five months of fundraising, the London tail-end specialist has held a final close above its initial hard-cap.
The retirement system said it is restructuring and rebalancing its private equity programme and has already reduced its number of GPs to 100 from 132.
The pension plan, which has $62bn in assets, is an existing investor in Coller funds.
Five Arrows Secondary Opportunities, the secondaries unit of the banking group, will target small and mid-cap European deals with its FASO IV vehicle.
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