State of Michigan Retirement System’s iShares MBS ETF MBB Stock Holding History

State of Michigan Retirement System’s Portfolio MBB Stock Details MBB Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$57M	Hold	600,000	–	–	0.3%	66
2025 Q4	$57.1M	Hold	600,000	–	–	0.28%	60
2025 Q3	$57.1M	Hold	600,000	–	–	0.27%	57
2025 Q2	$56.3M	Hold	600,000	–	–	0.29%	58
2025 Q1	$56.3M	Hold	600,000	–	–	0.32%	55
2024 Q4	$55M	Hold	600,000	–	–	0.29%	56
2024 Q3	$57.5M	Hold	600,000	–	–	0.29%	54
2024 Q2	$55.1M	Sell	600,000 -965,800	-62%	-$88M	0.28%	57
2024 Q1	$145M	Buy	1,565,800 +1,025,000	+190%	+$94.8M	0.78%	21
2023 Q4	$50.9M	Hold	540,800	–	–	0.3%	60
2023 Q3	$48M	Hold	540,800	–	–	0.31%	57
2023 Q2	$50.4M	Buy	540,800 +315,000	+140%	+$29.6M	0.31%	58
2023 Q1	$21.4M	Hold	225,800	–	–	0.14%	137
2022 Q4	$20.9M	Hold	225,800	–	–	0.15%	131
2022 Q3	$20.7M	Hold	225,800	–	–	0.15%	118
2022 Q2	$22M	Hold	225,800	–	–	0.15%	116
2022 Q1	$23M	Hold	225,800	–	–	0.13%	121
2021 Q4	$24.3M	Hold	225,800	–	–	0.13%	130
2021 Q3	$24.4M	Hold	225,800	–	–	0.14%	116
2021 Q2	$24.4M	Hold	225,800	–	–	0.14%	141
2021 Q1	$24.5M	Sell	225,800 -229,200	-50%	-$25.1M	0.15%	134
2020 Q4	$50.1M	Buy	+455,000	New	+$50.1M	0.34%	70

Other funds holding MBB

Bank of America Charlotte, North Carolina $1.37T AUM 24.88% 1-Year Est. Return

JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return

Envestnet Asset Management Chicago, Illinois $374B AUM 17.66% 1-Year Est. Return

LPL Financial San Diego, California $377B AUM 19.32% 1-Year Est. Return

UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return

TWIM

TIAA Wealth Investment Management New York $13.1B AUM

Ameriprise Minneapolis, Minnesota $432B AUM 30.22% 1-Year Est. Return

Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return

TCIIS

TIAA-CREF Individual & Institutional Services New York $26B AUM

Truist Financial Charlotte, North Carolina $74.2B AUM 21.09% 1-Year Est. Return

State of Michigan Retirement System's MBB Position: Q1 2026 in Review

State of Michigan Retirement System held its iShares MBS ETF (MBB) position steady in Q1 2026 at 600,000 shares worth $57M. The position accounts for 0.3% of the portfolio, ranked #66.

State of Michigan Retirement System first reported a position in MBB in Q4 2020 and has held it in 22 quarters since. The position peaked at $145M in Q1 2024. 1,019 funds tracked by Wall St. Rank hold MBB as of Q1 2026.

State of Michigan Retirement System held 600,000 shares of iShares MBS ETF worth $57M as of Q1 2026.
State of Michigan Retirement System left its iShares MBS ETF share count unchanged in Q1 2026.
iShares MBS ETF made up 0.3% of State of Michigan Retirement System's portfolio in Q1 2026, its #66 holding.
State of Michigan Retirement System first reported a position in iShares MBS ETF in Q4 2020 and has held it in 22 quarters since.
State of Michigan Retirement System's iShares MBS ETF position peaked at $145M in Q1 2024.
1,019 funds tracked by Wall St. Rank held iShares MBS ETF as of Q1 2026.

Based on State of Michigan Retirement System's 13F filing for Q1 2026, filed 4 May 2026.