State of Michigan Retirement System
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State of Michigan Retirement System’s Iridium Communications IRDM Stock Holding History

State of Michigan Retirement System’s Portfolio IRDM Stock Details IRDM Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q4 		– Sell
-25,259
Closed -$441K – 943
2025
Q3 		$441K Sell
25,259
-700
-3% -$17.3K ﹤0.01% 932
2025
Q2 		$783K Sell
25,959
-100
-0.4% -$2.6K ﹤0.01% 879
2025
Q1 		$712K Sell
26,059
-900
-3% -$26.4K ﹤0.01% 895
2024
Q4 		$782K Sell
26,959
-1,100
-4% -$32.7K ﹤0.01% 893
2024
Q3 		$854K Sell
28,059
-1,200
-4% -$32.7K ﹤0.01% 881
2024
Q2 		$779K Sell
29,259
-1,200
-4% -$33.8K ﹤0.01% 883
2024
Q1 		$797K Buy
30,459
+700
+2% +$22.8K ﹤0.01% 889
2023
Q4 		$1.22M Sell
29,759
-100
-0.3% -$3.96K 0.01% 768
2023
Q3 		$1.36M Sell
29,859
-1,200
-4% -$62.2K 0.01% 707
2023
Q2 		$1.93M Sell
31,059
-700
-2% -$43.3K 0.01% 604
2023
Q1 		$1.97M Sell
31,759
-200
-0.6% -$12K 0.01% 598
2022
Q4 		$1.64M Hold
31,959
– – 0.01% 639
2022
Q3 		$1.42M Sell
31,959
-600
-2% -$26K 0.01% 650
2022
Q2 		$1.22M Sell
32,559
-1,000
-3% -$37.3K 0.01% 719
2022
Q1 		$1.35M Buy
33,559
+59
+0.2% +$2.22K 0.01% 725
2021
Q4 		$1.38M Buy
33,500
+400
+1% +$16.2K 0.01% 752
2021
Q3 		$1.32M Buy
33,100
+3,500
+12% +$147K 0.01% 757
2021
Q2 		$1.18M Sell
29,600
-14,200
-32% -$552K 0.01% 799
2021
Q1 		$1.81M Buy
+43,800
New +$1.92M 0.01% 756

Other funds holding IRDM

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
SHCM
Silver Heights Capital Management Toronto, Ontario, Canada $324M AUM 55.4% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.38T AUM 44.17% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
ARK Investment Management
ARK Investment Management St. Petersburg, Florida $15.4B AUM 50.29% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $1.15T AUM 47.82% 1-Year Est. Return
Gotham Asset Management
Gotham Asset Management New York $43B AUM 34.97% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

State of Michigan Retirement System's IRDM Position: Q4 2025 in Review

State of Michigan Retirement System sold out of Iridium Communications (IRDM) in Q4 2025, closing a stake of 25,259 shares — an estimated $441K sold.

State of Michigan Retirement System first reported a position in IRDM in Q1 2021 and held it in 19 quarters. The position peaked at $1.97M in Q1 2023. 325 funds tracked by Wall St. Rank hold IRDM as of Q4 2025.

  • State of Michigan Retirement System reported no remaining Iridium Communications position as of Q4 2025 after selling out during the quarter.
  • State of Michigan Retirement System sold 25,259 Iridium Communications shares in Q4 2025, an estimated $441K.
  • State of Michigan Retirement System first reported a position in Iridium Communications in Q1 2021 and held it in 19 quarters.
  • State of Michigan Retirement System's Iridium Communications position peaked at $1.97M in Q1 2023.
  • 325 funds tracked by Wall St. Rank held Iridium Communications as of Q4 2025.

Based on State of Michigan Retirement System's 13F filing for Q4 2025, filed 29 Jan 2026.