Iridium Communications Inc (IRDM) Ownership
IRDM ownership summary
as of October 18, 2026- Institutions
- 89.0% of shares outstanding
- Insiders
- 11.92% of shares outstanding
- Shares outstanding
- 106.0M
- Float
- 86.8M shares available to trade
- Short interest
- 3.69% 3.4M shares short
- Days to cover
- 3.16 short interest down 0.9% vs prior month
- Institutions 88.96%
- Insiders 11.92%
IRDM top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 12.69% | 13.4M | $588.5M | −492,280 (−3.5%) | June 30, 2026 |
| 2 | AQR Capital Management LLC | 6.46% | 6.8M | $299.6M | +3.9M (+134.7%) | June 30, 2026 |
| 3 | Vanguard Portfolio Management, LLC | 5.13% | 5.4M | $238.1M | −651,350 (−10.7%) | June 30, 2026 |
| 4 | American Century Companies Inc | 4.58% | 4.9M | $212.5M | +1.4M (+40.0%) | June 30, 2026 |
| 5 | State Street Corp | 4.47% | 4.7M | $207.1M | −316,452 (−6.3%) | June 30, 2026 |
| 6 | Vanguard Capital Management, LLC | 3.99% | 4.2M | $185.2M | +120,836 (+2.9%) | June 30, 2026 |
| 7 | Silver Heights Capital Management Inc. | 3.09% | 3.3M | $143.3M | −1.9M (−36.4%) | June 30, 2026 |
| 8 | Gotham Asset Management, LLC | 2.37% | 2.5M | $110.0M | −839,654 (−25.0%) | June 30, 2026 |
| 9 | Dimensional Fund Advisors, Inc. | 2.22% | 2.4M | $103.2M | +198,784 (+9.2%) | June 30, 2026 |
| 10 | Van Eck Associates Corporation | 2.14% | 2.3M | $99.4M | +766,171 (+50.9%) | June 30, 2026 |
| 11 | Pacer Advisors, INC. | 2.05% | 2.2M | $94.9M | +1.3M (+143.5%) | June 30, 2026 |
| 12 | Geode Capital Management, LLC | 1.93% | 2.0M | $89.5M | +37,812 (+1.9%) | June 30, 2026 |
| 13 | Morgan Stanley - Brokerage Accounts | 1.43% | 1.5M | $66.4M | −65,933 (−4.2%) | June 30, 2026 |
| 14 | Charles Schwab Investment Management Inc | 1.24% | 1.3M | $57.7M | −48,223 (−3.5%) | June 30, 2026 |
| 15 | ARK Investment Management LLC | 1.15% | 1.2M | $53.2M | −511,689 (−29.6%) | June 30, 2026 |
| 16 | Bank of New York Mellon Corp | 1.08% | 1.1M | $50.1M | −6,395 (−0.6%) | June 30, 2026 |
| 17 | UBS Group AG | 0.95% | 1.0M | $44.0M | −278,959 (−21.7%) | June 30, 2026 |
| 18 | Balyasny Asset Management LLC | 0.91% | 968K | $42.3M | +844,017 (+683.1%) | June 30, 2026 |
| 19 | Amvescap Plc. | 0.86% | 908K | $39.7M | −79,792 (−8.1%) | June 30, 2026 |
| 20 | Northern Trust Corp | 0.81% | 854K | $37.4M | −9,382 (−1.1%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 8 holders added 8.6M shares and 12 cut 5.2M.
IRDM top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | iShares Core S&P Small-Cap ETF | 5.95% | 6.3M | $276.2M | +1,368 (+0.0%) | September 30, 2026 |
| 2 | Avantis US Small Cap Value ETF | 3.63% | 3.8M | $168.3M | — | September 30, 2026 |
| 3 | Vanguard MStar Total Stk Mkt Idx Invest | 2.70% | 2.9M | $125.0M | −3,740 (−0.1%) | August 31, 2026 |
| 4 | Vanguard Small Cap Index | 1.91% | 2.0M | $88.8M | −38,075 (−1.8%) | September 30, 2026 |
| 5 | VanEck Space Innovators ETF A USD Acc | 1.57% | 1.7M | $72.6M | — | September 30, 2026 |
| 6 | Pacer US Large Cp CA Cows Gr Ldrs ETF | 1.11% | 1.2M | $51.6M | — | September 30, 2026 |
| 7 | Vanguard MStar Small Cap Growth Indx Inv | 1.07% | 1.1M | $49.4M | −59,202 (−5.0%) | September 30, 2026 |
| 8 | State Street SPDR Port S&P 600 Sm CpETF | 0.91% | 964K | $42.2M | — | September 30, 2026 |
| 9 | Vanguard Tax-Managed Small Cap Adm | 0.67% | 713K | $31.2M | −3,791 (−0.5%) | September 30, 2026 |
| 10 | iShares US Telecommunications ETF | 0.58% | 612K | $26.8M | — | September 30, 2026 |
| 11 | iShares S&P Small-Cap 600 Growth ETF | 0.57% | 599K | $26.2M | — | September 30, 2026 |
| 12 | Schwab US Small-Cap ETF™ | 0.53% | 558K | $24.4M | +369 (+0.1%) | September 30, 2026 |
| 13 | Fidelity Extended Market Index | 0.48% | 512K | $22.4M | −10,494 (−2.0%) | August 31, 2026 |
| 14 | DFA US Small Cap I | 0.42% | 449K | $19.6M | — | August 31, 2026 |
| 15 | Schwab Fundamental U.S. Small CompanyETF | 0.39% | 409K | $17.9M | +574 (+0.1%) | September 30, 2026 |
| 16 | iShares Russell Mid-Cap ETF | 0.36% | 386K | $16.9M | +703 (+0.2%) | September 30, 2026 |
| 17 | Jupiter Merian Glb Eq Abs Rt I USD Acc | 0.36% | 377K | $16.5M | −515,853 (−57.7%) | June 30, 2026 |
| 18 | Vanguard High Dividend Yield ETF | 0.36% | 377K | $16.5M | +645 (+0.2%) | September 30, 2026 |
| 19 | State Street® SPDR® S&P 600™ Sm Cp GrETF | 0.35% | 376K | $16.4M | — | September 30, 2026 |
| 20 | Vanguard S&P Small-Cap 600 ETF | 0.35% | 375K | $16.4M | −5,260 (−1.4%) | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
IRDM insider transactions
latest 7| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-04-06 | Timothy Kapalka | Sell | $33.00 | 2,043 | $67,419 |
| 2026-04-02 | Timothy Kapalka | Sell | $31.00 | 3,790 | $117,490 |
| 2025-10-31 | Thomas Fitzpatrick | Sell | $18.00 | 20,839 | $375,102 |
| 2025-10-30 | Matthew J Desch | Buy | $17.33 | 20,000 | $346,600 |
| 2025-10-28 | Robert H Niehaus | Buy | $17.49 | 30,000 | $524,700 |
| 2025-10-28 | Thomas Fitzpatrick | Sell | $18.00 | 6,797 | $122,346 |
| 2025-10-27 | Thomas Fitzpatrick | Sell | $18.00 | 3,331 | $59,958 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
IRDM shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns IRDM
Institutional investors own 89.0% of Iridium Communications's shares and insiders 11.92%. The largest holder is BlackRock Inc with 12.69% of the shares (13.4M), as of June 30, 2026. Among the top 20 institutions, 8 added shares and 12 reduced their stake in the latest filings. Short interest is 3.69% of the float, or 3.16 days of average trading volume. The share count rose 11.6% since 2014.
Related: IRDM analyst forecast, IRDM key metrics, IRDM dividend history. See the IRDM stock overview for the latest quote and news.
IRDM ownership FAQ
Who owns the most Iridium Communications stock?
The largest shareholders of Iridium Communications are BlackRock Inc (12.69%), AQR Capital Management LLC (6.46%), Vanguard Portfolio Management, LLC (5.13%), American Century Companies Inc (4.58%), State Street Corp (4.47%).
What percentage of Iridium Communications is owned by institutions?
Institutions hold 89.0% of Iridium Communications's shares outstanding; insiders hold 11.92%.
Which funds own Iridium Communications?
The largest fund holders of Iridium Communications are iShares Core S&P Small-Cap ETF (5.95%), Avantis US Small Cap Value ETF (3.63%), Vanguard MStar Total Stk Mkt Idx Invest (2.70%), Vanguard Small Cap Index (1.91%), VanEck Space Innovators ETF A USD Acc (1.57%).
What is Iridium Communications's short interest?
3.4M shares of Iridium Communications were sold short, 3.69% of the float; at the average daily volume it would take 3.16 days to cover.
Are insiders buying or selling Iridium Communications?
Of the latest 7 reported insider transactions in Iridium Communications (since October 27, 2025), 2 were purchases and 5 were sales.
How many shares of Iridium Communications are outstanding?
Iridium Communications has 106.0M shares outstanding, of which 86.8M are in the public float.