Two Sigma Advisers
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Two Sigma Advisers’s Iridium Communications IRDM Stock Holding History

Two Sigma Advisers’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
2026
Q1 		– Sell
-353,826
Closed -$6.15M – 1061
2025
Q4 		$6.15M Buy
353,826
+128,126
+57% +$2.26M 0.01% 713
2025
Q3 		$3.94M Buy
225,700
+185,900
+467% +$4.59M 0.01% 830
2025
Q2 		$1.2M Buy
39,800
+11,600
+41% +$302K ﹤0.01% 1353
2025
Q1 		$770K Buy
28,200
+20,100
+248% +$589K ﹤0.01% 1587
2024
Q4 		$235K Buy
8,100
+500
+7% +$14.9K ﹤0.01% 2074
2024
Q3 		$231K Buy
+7,600
New +$207K ﹤0.01% 2014
2024
Q2 		– Sell
-13,000
Closed -$340K – 2560
2024
Q1 		$340K Sell
13,000
-12,700
-49% -$413K ﹤0.01% 2023
2023
Q4 		$1.06M Sell
25,700
-28,200
-52% -$1.12M ﹤0.01% 1623
2023
Q3 		$2.45M Buy
53,900
+14,400
+36% +$746K 0.01% 1086
2023
Q2 		$2.45M Sell
39,500
-76,700
-66% -$4.74M 0.01% 1088
2023
Q1 		$7.2M Sell
116,200
-43,700
-27% -$2.62M 0.02% 662
2022
Q4 		$8.22M Buy
159,900
+2,400
+2% +$120K 0.02% 576
2022
Q3 		$6.99M Buy
157,500
+21,600
+16% +$936K 0.02% 606
2022
Q2 		$5.1M Sell
135,900
-19,300
-12% -$720K 0.01% 770
2022
Q1 		$6.26M Buy
155,200
+84,900
+121% +$3.2M 0.02% 705
2021
Q4 		$2.9M Buy
70,300
+37,900
+117% +$1.53M 0.01% 1009
2021
Q3 		$1.29M Buy
+32,400
New +$1.36M ﹤0.01% 1491
2020
Q2 		– Sell
-9,100
Closed -$203K – 2546
2020
Q1 		$203K Sell
9,100
-300
-3% -$7.77K ﹤0.01% 2166
2019
Q4 		$232K Buy
+9,400
New +$225K ﹤0.01% 2138
2017
Q3 		– Sell
-13,428
Closed -$148K – 2272
2017
Q2 		$148K Buy
13,428
+1,800
+15% +$18.8K ﹤0.01% 2151
2017
Q1 		$112K Sell
11,628
-5,300
-31% -$50.6K ﹤0.01% 2268
2016
Q4 		$163K Buy
+16,928
New +$151K ﹤0.01% 2229
2015
Q1 		– Sell
-12,028
Closed -$117K – 2132
2014
Q4 		$117K Buy
+12,028
New +$113K ﹤0.01% 2310

Other funds holding IRDM

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
SHCM
Silver Heights Capital Management Toronto, Ontario, Canada $324M AUM 55.4% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
GAM
Gotham Asset Management New York $43B AUM 34.97% 1-Year Est. Return
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 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

Two Sigma Advisers's IRDM Position: Q1 2026 in Review

Two Sigma Advisers sold out of Iridium Communications (IRDM) in Q1 2026, closing a stake of 353,826 shares — an estimated $6.15M sold.

Two Sigma Advisers first reported a position in IRDM in Q4 2014 and held it in 23 quarters. The position peaked at $8.22M in Q4 2022. 382 funds tracked by Wall St. Rank hold IRDM as of Q1 2026.

  • Two Sigma Advisers reported no remaining Iridium Communications position as of Q1 2026 after selling out during the quarter.
  • Two Sigma Advisers sold 353,826 Iridium Communications shares in Q1 2026, an estimated $6.15M.
  • Two Sigma Advisers first reported a position in Iridium Communications in Q4 2014 and held it in 23 quarters.
  • Two Sigma Advisers's Iridium Communications position peaked at $8.22M in Q4 2022.
  • 382 funds tracked by Wall St. Rank held Iridium Communications as of Q1 2026.

Based on Two Sigma Advisers's 13F filing for Q1 2026.