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 Q2	$7.58M	Hold	138,207	–	–	0.4%	80
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 New York $6.73T AUM 46.02% 1-Year Est. Return

AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

SHCM

Silver Heights Capital Management Toronto, Ontario, Canada $324M AUM 55.4% 1-Year Est. Return

GAM

Gotham Asset Management New York $43B AUM 34.97% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

VanEck Associates New York $164B AUM 112.45% 1-Year Est. Return

PDT Partners's IRDM Position: Q2 2026 in Review

PDT Partners held its Iridium Communications (IRDM) position steady in Q2 2026 at 138,207 shares worth $7.58M. The position accounts for 0.4% of the portfolio, ranked #80.

PDT Partners first reported a position in IRDM in Q2 2013 and has held it in 13 quarters since. 483 funds tracked by Wall St. Rank hold IRDM as of Q2 2026.

PDT Partners held 138,207 shares of Iridium Communications worth $7.58M as of Q2 2026.
PDT Partners left its Iridium Communications share count unchanged in Q2 2026.
Iridium Communications made up 0.4% of PDT Partners's portfolio in Q2 2026, its #80 holding.
PDT Partners first reported a position in Iridium Communications in Q2 2013 and has held it in 13 quarters since.
483 funds tracked by Wall St. Rank held Iridium Communications as of Q2 2026.

Based on PDT Partners's 13F filing for Q2 2026, filed 14 Aug 2026.