Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
365 institutional managers reported holding IRDM for the quarter ended Mar 31, 2026. Together they hold about 83% of shares outstanding; the top 10 hold 48%. 99 opened new positions; 52 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 13.94M | 13.08% | $386.7M | unchanged | ≤2013 |
| Vanguard Group | 11.02M | 10.35% | $305.8M | added +8.5% | ≤2013 |
| Silver Heights Capital Management INC (focused) | 5.15M | 4.83% | $142.7M | trimmed -2% | 2016 Q4 |
| State Street | 5.05M | 4.74% | $140.1M | added +6.1% | ≤2013 |
| American Century Companies INC | 3.47M | 3.26% | $96.3M | added +12.7% | 2019 Q2 |
| Gotham Asset Management | 3.35M | 3.15% | $93.0M | added +45.2% | 2019 Q4 |
| AQR Capital | 2.92M | 2.74% | $80.9M | added +509% | 2018 Q2 |
| Dimensional Fund Advisors | 2.16M | 2.03% | $59.9M | added +3.2% | ≤2013 |
| Geode Capital | 2.01M | 1.88% | $55.7M | added +5.2% | ≤2013 |
| Man Group | 1.91M | 1.79% | $52.9M | added +3% | 2018 Q3 |
| ARK Investment Management | 1.73M | 1.62% | $47.9M | trimmed -39.4% | 2019 Q3 |
| UBS | 1.64M | 1.54% | $45.6M | added +0.6% | ≤2013 |
| Morgan Stanley | 1.58M | 1.49% | $43.9M | trimmed -11.8% | ≤2013 |
| VAN ECK Associates CORP | 1.50M | 1.41% | $41.7M | added +24.9% | 2019 Q4 |
| Charles Schwab Investment Management | 1.37M | 1.28% | $37.9M | added +13.2% | ≤2013 |
| Schroder Investment Management Group | 1.28M | 1.20% | $35.6M | added +34.3% | 2022 Q2 |
| BNY Mellon | 1.15M | 1.08% | $31.9M | trimmed -2% | ≤2013 |
| Arrowstreet Capital | 1.10M | 1.03% | $30.5M | trimmed -4.7% | 2022 Q3 |
| Barclays PLC | 994.1k | 0.93% | $27.6M | added +1.3% | ≤2013 |
| Invesco | 987.9k | 0.93% | $27.4M | trimmed -0.6% | ≤2013 |
| Select Equity Group | 942.5k | 0.89% | $26.1M | added +12.8% | 2021 Q2 |
| Goldman Sachs | 928.4k | 0.87% | $25.8M | trimmed -60% | ≤2013 |
| Jupiter Asset Management LTD | 893.3k | 0.84% | $24.8M | added +10.5% | 2025 Q1 |
| Northern Trust | 863.5k | 0.81% | $24.0M | trimmed -11.4% | ≤2013 |
| Sumitomo Mitsui Trust Group, INC. | 791.8k | 0.74% | $22.0M | trimmed -32.3% | 2019 Q1 |
| Penserra Capital Management LLC | 755.7k | 0.71% | $21.0M | trimmed -11.4% | 2019 Q2 |
| Amova Asset Management Americas, INC. | 737.0k | 0.69% | $20.4M | trimmed -34.1% | 2018 Q3 |
| Pinnacle Associates LTD | 562.7k | 0.53% | $15.6M | trimmed -7.2% | 2014 Q2 |
| FMR (Fidelity) | 540.1k | 0.51% | $15.0M | added +17.4% | ≤2013 |
| Mitsubishi UFJ Asset Management CO., LTD. | 538.4k | 0.51% | $14.9M | added +35.7% | 2019 Q2 |
| Panagora Asset Management INC | 529.5k | 0.50% | $14.7M | opened | 2026 Q1 |
| Brown Advisory INC | 512.6k | 0.48% | $14.2M | unchanged | ≤2013 |
| Principal Financial Group INC | 508.3k | 0.48% | $14.1M | added +2.2% | ≤2013 |
| Millennium Management | 494.7k | 0.46% | $13.7M | trimmed -52.3% | 2021 Q1 |
| Nuveen | 425.1k | 0.40% | $11.8M | trimmed -29.1% | 2019 Q2 |
| Two Sigma | 402.4k | 0.38% | $11.2M | trimmed -42.6% | 2025 Q1 |
| Stifel Financial CORP | 397.9k | 0.37% | $11.0M | added +31.4% | 2018 Q4 |
| Legal & General Group PLC | 378.7k | 0.35% | $10.5M | trimmed -7.8% | 2014 Q3 |
| Public Sector Pension Investment Board | 375.5k | 0.35% | $10.4M | added +3.6% | 2025 Q2 |
| Raymond James Financial INC | 368.3k | 0.35% | $10.2M | added +12.5% | ≤2013 |
| Russell Investments Group, LTD. | 352.9k | 0.33% | $9.8M | added +14.5% | 2019 Q3 |
| First Trust Advisors LP | 352.2k | 0.33% | $9.8M | trimmed -17.8% | 2015 Q1 |
| Bank OF America CORP /DE/ | 351.2k | 0.33% | $9.7M | added +62.3% | ≤2013 |
| Janus Henderson | 306.7k | 0.29% | $8.5M | added +9.8% | 2021 Q3 |
| Susquehanna International Group | 291.7k | 0.27% | $8.1M | added +69.8% | 2017 Q4 |
| Robertson Opportunity Capital, LLC (focused) | 287.3k | 0.27% | $8.0M | opened | 2024 Q2 |
| CX Institutional | 272.8k | 0.26% | $7.6M | opened | 2026 Q1 |
| Nordea Investment Management AB | 255.8k | 0.24% | $7.1M | trimmed -4.4% | 2024 Q2 |
| Defiance ETFs, LLC | 255.2k | 0.24% | $7.1M | trimmed -54.8% | 2025 Q4 |
| Rhumbline Advisers | 234.2k | 0.22% | $6.5M | added +4.3% | ≤2013 |
Largest 50 of 365 shown; the full ranked, searchable register is at boothcheck.com/holders/IRDM. Related filers are grouped using the filings' own included-manager declarations. Historically, several managers opening new positions in the same quarter said almost nothing about the quarter that followed (59,118 cases since 2013). A filed record, not a forecast. Nothing here is investment advice.