IRIDIUM COMMUNICATIONS INC (IRDM) Stock Institutional Trading Activity


IRIDIUM COMMUNICATIONS INC (IRDM) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Cullen Value Fund, ARK Invest, and Renaissance Technologies LLC. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.

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Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q4 2025Cullen Value FundSell-4,14724,325$470,439
Q3 2025ARK InvestBuy1,156,5806,490,108$113,317,286
Q3 2025Cullen Value FundSell-2,12328,472$534,136
Q2 2025ARK InvestBuy441,8515,333,528$160,912,540
Q2 2025Cullen Value FundSell-74230,595$923,043
Q1 2025ARK InvestBuy2,383,9624,891,677$133,640,616
Q1 2025Renaissance Technologies LLCBuy280,669296,699$8,105,817
Q1 2025Cullen Value FundSell-2,29631,337$856,120
Q4 2024ARK InvestBuy134,9242,507,715$72,773,889
Q4 2024Renaissance Technologies LLCSell-106,26916,030$465,191
Q4 2024Cullen Value FundSell-99133,633$976,024
Q3 2024ARK InvestSell-147,7562,372,791$72,251,486
Q3 2024Renaissance Technologies LLCSell-96,401122,299$3,724,005
Q3 2024Cullen Value FundSell-22334,624$1,054,300
Q2 2024ARK InvestSell-52,6332,520,547$67,096,961
Q2 2024Renaissance Technologies LLCSell-357,999218,700$5,821,794
Q2 2024Cullen Value FundSell-33134,847$927,637
Q1 2024ARK InvestBuy399,2162,573,180$67,314,389
Q1 2024Renaissance Technologies LLCBuy12,900576,699$15,086
Q1 2024Cullen Value FundSell-2,42735,178$887,531
Q4 2023ARK InvestBuy249,1852,173,964$89,480,358
Q4 2023Renaissance Technologies LLCBuy145,000563,799$23,206
Q4 2023Cullen Value FundBuy37,60537,605$1,547,825
Q3 2023ARK InvestBuy376,7331,924,779$87,558,197
Q3 2023Renaissance Technologies LLCSell-20,100418,799$19,051
Q2 2023ARK InvestBuy95,3941,548,046$96,164,618
Q2 2023Renaissance Technologies LLCSell-173,400438,899$27,264
Q1 2023ARK InvestSell-41,8031,452,652$89,962,738
Q1 2023Renaissance Technologies LLCBuy162,539612,299$37,920
Q4 2022ARK InvestSell-274,3251,494,455$76,814,987

Frequently asked questions about IRDM activity

  • Which institutional owners are buying IRDM?

    Institutional owners buying IRDM include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in IRDM activity?

    "Buy" means an investor increased their reported position in IRDM compared to the prior reporting period. This reflects growing exposure to IRIDIUM COMMUNICATIONS INC (IRDM) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in IRDM increasing?

    Institutional interest in IRDM can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.