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PDT Partners’s Iridium Communications IRDM Stock Holding History

PDT Partners’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 		$3.83M Hold
138,207
– – 0.23% 149
2025
Q4 		$2.4M Buy
138,207
+47,981
+53% +$848K 0.16% 218
2025
Q3 		$1.58M Buy
+90,226
New +$2.23M 0.1% 298
2023
Q1 		– Sell
-21,539
Closed -$1.11M – 645
2022
Q4 		$1.11M Sell
21,539
-18
-0.1% -$904 0.18% 192
2022
Q3 		$956K Sell
21,557
-10,812
-33% -$469K 0.14% 231
2022
Q2 		$1.22M Sell
32,369
-4,863
-13% -$181K 0.11% 326
2022
Q1 		$1.5M Buy
+37,232
New +$1.4M 0.13% 242
2015
Q4 		– Sell
-30,100
Closed -$185K – 670
2015
Q3 		$185K Buy
+30,100
New +$219K ﹤0.01% 1170
2015
Q1 		– Sell
-117,436
Closed -$1.15M – 1395
2014
Q4 		$1.15M Buy
117,436
+84,436
+256% +$790K 0.11% 210
2014
Q3 		$292K Buy
+33,000
New +$286K 0.01% 1111
2014
Q2 		– Sell
-97,197
Closed -$730K – 1506
2014
Q1 		$730K Buy
+97,197
New +$650K 0.02% 784
2013
Q3 		– Sell
-19,492
Closed -$151K – 1603
2013
Q2 		$151K Buy
+19,492
New +$137K ﹤0.01% 1410

Other funds holding IRDM

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
SHCM
Silver Heights Capital Management Toronto, Ontario, Canada $260M AUM 6.93% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
American Century Companies
American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return
GAM
Gotham Asset Management New York $32.7B AUM 27.65% 1-Year Est. Return
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $218B AUM 29.41% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

PDT Partners's IRDM Position: Q1 2026 in Review

PDT Partners held its Iridium Communications (IRDM) position steady in Q1 2026 at 138,207 shares worth $3.83M. The position accounts for 0.23% of the portfolio, ranked #149.

PDT Partners first reported a position in IRDM in Q2 2013 and has held it in 12 quarters since. 379 funds tracked by Wall St. Rank hold IRDM as of Q1 2026.

  • PDT Partners held 138,207 shares of Iridium Communications worth $3.83M as of Q1 2026.
  • PDT Partners left its Iridium Communications share count unchanged in Q1 2026.
  • Iridium Communications made up 0.23% of PDT Partners's portfolio in Q1 2026, its #149 holding.
  • PDT Partners first reported a position in Iridium Communications in Q2 2013 and has held it in 12 quarters since.
  • 379 funds tracked by Wall St. Rank held Iridium Communications as of Q1 2026.

Based on PDT Partners's 13F filing for Q1 2026, filed 15 May 2026.