Iridium Communications Inc.
Iridium Communications Inc. (IRDM) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · IRDM · as of Mar 31, 2025
Ownership Breakdown
366
Institutional Holders
▲ 4 vs Q4
$2.85B
Total Inst. Value
▼ $62.35M vs Q4
105.73M
Shares Outstanding
freeFloat 88.07%
104.17M
13F Shares Held
▲ 3.95M vs Q4
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
IRDM largest shareholders · institutional ownership
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. communications equipment, nec | 11.52M | 10.50% | 10.50% | $314.79B | May 2, 2025 | ▼ 1.18M |
VANGUARD GROUP INC communications equipment, nec | 9.84M | 8.96% | 8.96% | $268.77B | May 9, 2025 | ▼ 973.9K |
BAMCO INC /NY/ communications equipment, nec | 9.27M | 8.45% | 8.45% | $253.29B | May 15, 2025 | ▼ 1.50M |
ARK INVESTMENT MANAGEMENT LLC communications equipment, nec | 4.89M | 4.46% | 4.46% | $133.64B | May 7, 2025 | ▲ 2.38M |
STATE STREET CORP communications equipment, nec | 4.46M | 4.06% | 4.06% | $121.73B | May 15, 2025 | ▲ 72.2K |
SUMITOMO MITSUI TRUST HOLDINGS, INC. communications equipment, nec | 3.89M | 3.55% | 3.55% | $106.36B | Apr 25, 2025 | ▲ 1.06M |
NIKKO ASSET MANAGEMENT AMERICAS, INC. communications equipment, nec | 3.89M | 3.54% | 3.54% | $106.21B | May 7, 2025 | ▲ 1.06M |
SILVER HEIGHTS CAPITAL MANAGEMENT INC communications equipment, nec | 3.73M | 3.40% | 3.40% | $101.82B | May 14, 2025 | ▲ 11.4K |
VAN BERKOM & ASSOCIATES INC. communications equipment, nec | 2.89M | 2.63% | 2.63% | $78.83B | May 7, 2025 | ▼ 286.6K |
DIMENSIONAL FUND ADVISORS LP communications equipment, nec | 2.52M | 2.29% | 2.29% | $68.75B | May 13, 2025 | ▲ 454.4K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
30
Increased
+9.62M shares1
New Positions
first time holders19
Decreased
−5.49M shares0
Sold Out
fully exitedNet shares change (top 50)
+4.12M
+9.62M / −5.49M
Net new holders
+12
1 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
IRDM insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
1
Buy transactions
10
Sell transactions
0.10
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
O'Neill Vincent James Chief Financial Officer | Jun 1, 2026 | Tax Withhold | 1,459 | $51.78 | $75.5K | 128.4K | Form 4 ↗ |
Kapalka Timothy CAO Iridium Satellite LLC | Jun 1, 2026 | Award | 4,175 | — | — | 49.2K | Form 4 ↗ |
Kapalka Timothy CAO Iridium Satellite LLC | Jun 1, 2026 | Tax Withhold | 692 | $51.78 | $35.8K | 45.0K | Form 4 ↗ |
Last Timothy James EVP, Sales & Marketing | Jun 1, 2026 | Tax Withhold | 1,498 | $51.78 | $77.6K | 112.9K | Form 4 ↗ |
Scheimreif Scott EVP-Government Programs | Jun 1, 2026 | Tax Withhold | 2,205 | $51.78 | $114.2K | 259.8K | Form 4 ↗ |
DESCH MATTHEW J Chief Executive Officer | Jun 1, 2026 | Tax Withhold | 9,583 | $51.78 | $496.2K | 1.45M | Form 4 ↗ |
Morgan Kathleen A. Chief Legal Officer | Jun 1, 2026 | Tax Withhold | 2,052 | $51.78 | $106.3K | 158.1K | Form 4 ↗ |
McBride Suzanne E. Chief Operations Officer | Jun 1, 2026 | Tax Withhold | 3,622 | $51.78 | $187.5K | 367.5K | Form 4 ↗ |
Canfield Thomas C director | May 20, 2026 | D-Return | 135.7 | — | — | 233.7K | Form 4 ↗ |
Kapalka Timothy CAO Iridium Satellite LLC | Apr 2, 2026 | Sale | 3,790 | $31.00 | $117.5K | 47.8K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Iridium Communications Inc. (IRDM) is primarily owned by institutional investors, who hold approximately 98.5% of total shares outstanding. Company insiders own approximately 11.93%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of Iridium Communications Inc. is BLACKROCK, INC., holding approximately 11.52 million shares — equal to 10.50% of outstanding shares — as of March 31, 2025.
A total of 366 institutional investors currently hold IRDM stock, with a combined institutional value of approximately $2.85 billion as of the most recent 13F filing period.
Frequently asked questions
IRDM ownershipIridium Communications Inc. (IRDM) is primarily owned by institutional investors, who hold approximately 98.5% of shares. The largest shareholder is BLACKROCK, INC. with a 10.50% stake. Company insiders hold 11.93%. Data sourced from SEC Form 13F as of March 31, 2025.