Who owns Iridium Communications (IRDM)
Which tracked institutional funds hold IRDM, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See IRDM company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on IRDM is one-sided between 2026-Q1 and 2026-Q2: 209 added or opened and 59 trimmed or exited — on balance accumulating.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
IRDM’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes IRDM more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in IRDM divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 440 tracked filers holding IRDM, 289 increased or opened the position and 201 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in IRDM between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 45
- MASSACHUSETTS FINANCIAL SERVICES CO /MA/$28M
- Sculptor Capital LP$26M
- Jefferies Financial Group Inc.$22M
- IMC-Chicago, LLC$19M
- Jupiter Topco LLC$18M
- Tema ETFs LLC$17M
Full exits 44
- Pacer Advisors, Inc.$43M
- Select Equity Group, L.P.$26M
- JUPITER ASSET MANAGEMENT LTD$25M
- NORGES BANK$25M
- Penserra Capital Management LLC$21M
- JANUS HENDERSON GROUP PLC$9M
Largest adds
- BlackRock, Inc.$469M
- AQR CAPITAL MANAGEMENT LLC$294M
- AMERICAN CENTURY COMPANIES INC$170M
- VANGUARD PORTFOLIO MANAGEMENT LLC$129M
- STATE STREET CORP$120M
- VANGUARD CAPITAL MANAGEMENT LLC$118M
Largest trims
- Man Group plc$30M
- BARCLAYS PLC$23M
- STIFEL FINANCIAL CORP$7M
- MILLENNIUM MANAGEMENT LLC$5M
- LOS ANGELES CAPITAL MANAGEMENT LLC$5M
- Point72 Asset Management, L.P.$3M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 13,447,338 | $738M | 16.2% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 6,847,072 | $374M | 8.2% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC trimmed | 5,440,399 | $298M | 6.6% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 4,856,440 | $266M | 5.9% | 2026-Q2 |
| STATE STREET CORP trimmed | 4,733,714 | $260M | 5.7% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 4,232,161 | $232M | 5.1% | 2026-Q2 |
| Silver Heights Capital Management Inc trimmed | 3,274,947 | $180M | 4.0% | 2026-Q2 |
| Gotham Asset Management, LLC trimmed | 2,514,317 | $138M | 3.0% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 2,357,845 | $129M | 2.8% | 2026-Q2 |
| VAN ECK ASSOCIATES CORP added | 2,270,799 | $125M | 2.7% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 2,044,823 | $112M | 2.5% | 2026-Q2 |
| MORGAN STANLEY trimmed | 1,517,404 | $83M | 1.8% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 1,317,782 | $72M | 1.6% | 2026-Q2 |
| ARK Investment Management LLC trimmed | 1,215,113 | $67M | 1.5% | 2026-Q2 |
| Bank of New York Mellon Corp trimmed | 1,144,055 | $63M | 1.4% | 2026-Q2 |
| UBS Group AG trimmed | 1,005,602 | $55M | 1.2% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. added | 967,572 | $53M | 1.2% | 2026-Q2 |
| Invesco Ltd. added | 908,134 | $50M | 1.1% | 2026-Q2 |
| NORTHERN TRUST CORP trimmed | 854,112 | $47M | 1.0% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 789,191 | $43M | 1.0% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 754,424 | $41M | 0.9% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 726,762 | $40M | 0.9% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 657,958 | $36M | 0.8% | 2026-Q2 |
| SCHRODER INVESTMENT MANAGEMENT GROUP trimmed | 641,884 | $35M | 0.8% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 609,799 | $33M | 0.7% | 2026-Q2 |
| Sumitomo Mitsui Trust Group, Inc. trimmed | 587,179 | $32M | 0.7% | 2026-Q2 |
| Amova Asset Management Americas, Inc. trimmed | 550,679 | $30M | 0.7% | 2026-Q2 |
| BROWN ADVISORY INC added | 512,859 | $28M | 0.6% | 2026-Q2 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ new | 509,978 | $28M | 0.6% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 509,489 | $28M | 0.6% | 2026-Q2 |
| Nuveen, LLC added | 502,677 | $28M | 0.6% | 2026-Q2 |
| FMR LLC trimmed | 483,117 | $26M | 0.6% | 2026-Q2 |
| PANAGORA ASSET MANAGEMENT INC trimmed | 482,003 | $26M | 0.6% | 2026-Q2 |
| Sculptor Capital LP new | 469,000 | $26M | 0.6% | 2026-Q2 |
| FIRST TRUST ADVISORS LP added | 465,768 | $26M | 0.6% | 2026-Q2 |
| Man Group plc trimmed | 416,442 | $23M | 0.5% | 2026-Q2 |
| Public Sector Pension Investment Board added | 407,340 | $22M | 0.5% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 401,808 | $22M | 0.5% | 2026-Q2 |
| Jefferies Financial Group Inc. added | 396,110 | $22M | 0.5% | 2026-Q2 |
| PINNACLE ASSOCIATES LTD trimmed | 394,679 | $22M | 0.5% | 2026-Q2 |
| Legal & General Group Plc added | 380,075 | $21M | 0.5% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP trimmed | 363,685 | $20M | 0.4% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 361,703 | $20M | 0.4% | 2026-Q2 |
| IMC-Chicago, LLC added | 354,368 | $19M | 0.4% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 340,871 | $19M | 0.4% | 2026-Q2 |
| Mitsubishi UFJ Asset Management Co., Ltd. trimmed | 327,899 | $18M | 0.4% | 2026-Q2 |
| Jupiter Topco LLC new | 325,387 | $18M | 0.4% | 2026-Q2 |
| IEQ CAPITAL, LLC added | 311,175 | $17M | 0.4% | 2026-Q2 |
| Tema ETFs LLC new | 309,229 | $17M | 0.4% | 2026-Q2 |
| BRAUN STACEY ASSOCIATES INC new | 295,922 | $16M | 0.4% | 2026-Q2 |
| ALPINE ASSOCIATES MANAGEMENT INC. new | 289,700 | $16M | 0.4% | 2026-Q2 |
| Defiance ETFs, LLC added | 277,161 | $15M | 0.3% | 2026-Q2 |
| Mariner, LLC added | 272,397 | $15M | 0.3% | 2026-Q2 |
| NORDEA INVESTMENT MANAGEMENT AB added | 260,001 | $14M | 0.3% | 2026-Q2 |
| Robertson Opportunity Capital, LLC trimmed | 250,346 | $14M | 0.3% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 245,134 | $13M | 0.3% | 2026-Q2 |
| MACKENZIE FINANCIAL CORP added | 236,542 | $13M | 0.3% | 2026-Q2 |
| CUSHING ASSET MANAGEMENT, LP dba NXG INVESTMENT MANAGEMENT new | 236,000 | $13M | 0.3% | 2026-Q2 |
| ArchPoint Investors added | 230,796 | $13M | 0.3% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC trimmed | 222,994 | $12M | 0.3% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 198,087 | $11M | 0.2% | 2026-Q2 |
| Swiss National Bank trimmed | 185,300 | $10M | 0.2% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 181,531 | $10M | 0.2% | 2026-Q2 |
| Weiss Asset Management LP added | 173,416 | $10M | 0.2% | 2026-Q2 |
| BLAIR WILLIAM & CO/IL trimmed | 172,503 | $9M | 0.2% | 2026-Q2 |
| Cerity Partners LLC added | 171,875 | $9M | 0.2% | 2026-Q2 |
| CITIGROUP INC added | 163,745 | $9M | 0.2% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 153,205 | $8M | 0.2% | 2026-Q2 |
| Magnetar Financial LLC new | 153,186 | $8M | 0.2% | 2026-Q2 |
| Retirement Systems of Alabama | 151,400 | $8M | 0.2% | 2026-Q2 |
| Qube Research & Technologies Ltd trimmed | 149,142 | $8M | 0.2% | 2026-Q2 |
| PDT Partners, LLC | 138,207 | $8M | 0.2% | 2026-Q2 |
| COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS trimmed | 135,240 | $7M | 0.2% | 2026-Q2 |
| AQR Arbitrage LLC new | 132,611 | $7M | 0.2% | 2026-Q2 |
| Creative Planning added | 129,974 | $7M | 0.2% | 2026-Q2 |
| VICTORY CAPITAL MANAGEMENT INC trimmed | 128,482 | $7M | 0.2% | 2026-Q2 |
| LPL Financial LLC added | 127,605 | $7M | 0.2% | 2026-Q2 |
| Inspire Investing, LLC added | 119,707 | $7M | 0.1% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 115,034 | $6M | 0.1% | 2026-Q2 |
| Advisors Asset Management, Inc. trimmed | 106,829 | $6M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 106,747 | $6M | 0.1% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 104,140 | $6M | 0.1% | 2026-Q2 |
| MERCER GLOBAL ADVISORS INC /ADV added | 104,118 | $6M | 0.1% | 2026-Q2 |
| XTX Topco Ltd added | 100,123 | $5M | 0.1% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD added | 97,778 | $5M | 0.1% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC trimmed | 95,599 | $5M | 0.1% | 2026-Q2 |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC added | 89,240 | $4M | 0.1% | 2026-Q2 |
| Quantinno Capital Management LP added | 88,308 | $5M | 0.1% | 2026-Q2 |
| BARCLAYS PLC trimmed | 86,589 | $5M | 0.1% | 2026-Q2 |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM added | 85,686 | $5M | 0.1% | 2026-Q2 |
| Daiwa Securities Group Inc. trimmed | 85,400 | $5M | 0.1% | 2026-Q2 |
| STIFEL FINANCIAL CORP trimmed | 79,042 | $4M | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 78,203 | $4M | 0.1% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 78,095 | $4M | 0.1% | 2026-Q2 |
| TORONTO DOMINION BANK added | 77,047 | $4M | 0.1% | 2026-Q2 |
| ALGERT GLOBAL LLC trimmed | 75,478 | $4M | 0.1% | 2026-Q2 |
| Vanguard Investments Australia, Ltd. added | 72,812 | $4M | 0.1% | 2026-Q2 |
| Range Financial Group LLC added | 69,123 | $4M | 0.1% | 2026-Q2 |
| Illinois Municipal Retirement Fund added | 62,977 | $3M | 0.1% | 2026-Q2 |
| Aquatic Capital Management LLC trimmed | 62,173 | $3M | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.