Capstone Investment Advisors’s Iridium Communications IRDM Stock Holding History

Capstone Investment Advisors’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 Q3	–	Sell	-10,728	Closed	-$324K	–	1977
2025 Q2	$324K	Buy	+10,728	New	+$279K	﹤0.01%	1353
2024 Q4	–	Sell	-7,051	Closed	-$215K	–	1925
2024 Q3	$215K	Buy	+7,051	New	+$192K	﹤0.01%	1552
2024 Q2	–	Sell	-34,915	Closed	-$913K	–	2267
2024 Q1	$913K	Buy	+34,915	New	+$1.14M	﹤0.01%	1205
2023 Q4	–	Sell	-21,515	Closed	-$979K	–	2245
2023 Q3	$979K	Buy	+21,515	New	+$1.11M	﹤0.01%	993

Other funds holding IRDM

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

AIM

ARK Investment Management St. Petersburg, Florida $12.9B AUM 64.92% 1-Year Est. Return

SHCM

Silver Heights Capital Management Toronto, Ontario, Canada $260M AUM 6.93% 1-Year Est. Return

Sumitomo Mitsui Trust Group Minato-Ku, Tokyo, Japan $154B AUM 29.96% 1-Year Est. Return

NAMA

Nikko Asset Management Americas New York $7.07B AUM 50.91% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Millennium Management New York $240B AUM 35.51% 1-Year Est. Return

American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return

Capstone Investment Advisors's IRDM Position: Q3 2025 in Review

Capstone Investment Advisors sold out of Iridium Communications (IRDM) in Q3 2025, closing a stake of 10,728 shares — an estimated $324K sold.

Capstone Investment Advisors first reported a position in IRDM in Q3 2023 and held it in 4 quarters. The position peaked at $979K in Q3 2023. 324 funds tracked by Wall St. Rank hold IRDM as of Q3 2025.

Capstone Investment Advisors reported no remaining Iridium Communications position as of Q3 2025 after selling out during the quarter.
Capstone Investment Advisors sold 10,728 Iridium Communications shares in Q3 2025, an estimated $324K.
Capstone Investment Advisors first reported a position in Iridium Communications in Q3 2023 and held it in 4 quarters.
Capstone Investment Advisors's Iridium Communications position peaked at $979K in Q3 2023.
324 funds tracked by Wall St. Rank held Iridium Communications as of Q3 2025.

Based on Capstone Investment Advisors's 13F filing for Q3 2025, filed 14 Nov 2025.