IRDM Iridium Communications Inc.
Iridium Communications Inc. (IRDM) Hedge Fund Activity
This view isolates hedge funds from the broader institutional ownership shown on the Institutional tab. A pension fund tracking an index may have no view on a stock; when a hedge fund builds or exits a position, that decision can carry information. This page measures those changes. Positions as of June 30, 2026.
Based on quarterly 13F long-equity filings. Changes compare reported quarter-end positions; filings can be reported up to 45 days later and do not represent a fund's complete exposure.
Most significant moves
Ranked by conviction, not size — how much of the fund's own book the position represents, how far it moved, and what kind of fund made it.
| Fund | Action | Shares changed | Change | Est. value | Portfolio wt. | Score |
|---|---|---|---|---|---|---|
| Select Equity Group Long/Short Growth | Sold Out | -942.5K | -100.0% | $51.7M | 0.0% | 65 |
| Sculptor Capital Management Event Long/Short | New | +469.0K | — | $25.7M | 0.4% | 63 |
| CITADEL ADVISORS LLC Quant | Sold Out | -63.6K | -100.0% | $3.5M | 0.0% | 60 |
| MARSHALL WACE, LLP Long/Short | Sold Out | -24.9K | -100.0% | $1.4M | 0.0% | 58 |
| WORLDQUANT MILLENNIUM ADVISORS LLC Quant | Sold Out | -55.4K | -100.0% | $3.0M | 0.0% | 58 |
| Holocene Advisors, LP | Sold Out | -149.4K | -100.0% | $8.2M | 0.0% | 58 |
| Qube Research & Technologies Ltd Quant | New | +149.1K | — | $8.2M | 0.0% | 57 |
| Magnetar Capital Event Quant | New | +153.2K | — | $8.4M | 0.1% | 57 |
| Weiss Asset Management Event Quant | New | +173.4K | — | $9.5M | 0.2% | 57 |
| RENAISSANCE TECHNOLOGIES LLC Quant | Increased | +481.7K | +376.0% | $26.4M | 0.0% | 57 |
Most significant buyers
By move score, not size.
- Sculptor Capital Management
- Qube Research & Technologies Ltd
- Magnetar Capital
- Weiss Asset Management
- RENAISSANCE TECHNOLOGIES LLC
Most significant sellers
By move score, not size.
- Select Equity Group
- CITADEL ADVISORS LLC
- MARSHALL WACE, LLP
- WORLDQUANT MILLENNIUM ADVISORS LLC
- Holocene Advisors, LP
Hedge fund positions
| Fund | Tier | Shares | Previous | Change | Change % | Portfolio wt. | Action | Score |
|---|---|---|---|---|---|---|---|---|
| Select Equity Group | 1 | 0 | 942.5K | -942.5K | -100.0% | 0.0% | Sold Out | 65 |
| Sculptor Capital Management | 2 | 469.0K | 0 | +469.0K | — | 0.4% | New | 63 |
| CITADEL ADVISORS LLC | 1 | 0 | 63.6K | -63.6K | -100.0% | 0.0% | Sold Out | 60 |
| MARSHALL WACE, LLP | 2 | 0 | 24.9K | -24.9K | -100.0% | 0.0% | Sold Out | 58 |
| WORLDQUANT MILLENNIUM ADVISORS LLC | 2 | 0 | 55.4K | -55.4K | -100.0% | 0.0% | Sold Out | 58 |
| Holocene Advisors, LP | 2 | 0 | 149.4K | -149.4K | -100.0% | 0.0% | Sold Out | 58 |
| Qube Research & Technologies Ltd | 2 | 149.1K | 0 | +149.1K | — | 0.0% | New | 57 |
| Magnetar Capital | 2 | 153.2K | 0 | +153.2K | — | 0.1% | New | 57 |
| Weiss Asset Management | 2 | 173.4K | 0 | +173.4K | — | 0.2% | New | 57 |
| RENAISSANCE TECHNOLOGIES LLC | 1 | 609.8K | 128.1K | +481.7K | +376.0% | 0.0% | Increased | 57 |
| Squarepoint Ops LLC | 2 | 58.5K | 0 | +58.5K | — | 0.0% | New | 57 |
| Woodline Partners LP | 2 | 43.0K | 0 | +43.0K | — | 0.0% | New | 56 |
| Balyasny Asset Management L.P. | 2 | 967.6K | 123.6K | +844.0K | +683.1% | 0.1% | Increased | 56 |
| Tudor Investment Corporation | 2 | 0 | 23.9K | -23.9K | -100.0% | 0.0% | Sold Out | 55 |
| Point72 Asset Management, L.P. | 1 | 1.4K | 106.8K | -105.4K | -98.7% | 0.0% | Reduced | 55 |
| Capital Fund Management | 3 | 0 | 63.3K | -63.3K | -100.0% | 0.0% | Sold Out | 55 |
| Moore Capital Management | 3 | 30.0K | 0 | +30.0K | — | 0.0% | New | 54 |
| AQR Capital Management | 3 | 6.8M | 2.9M | +3.93M | +134.7% | 0.1% | Increased | 53 |
| Caxton Associates | 3 | 4.2K | 0 | +4.2K | — | 0.0% | New | 53 |
| Quinn Opportunity Partners | 4 | 52.6K | 0 | +52.6K | — | 0.1% | New | 51 |
| Edgestream Partners | 4 | 0 | 75.1K | -75.1K | -100.0% | 0.0% | Sold Out | 51 |
| Boothbay Fund Management | 4 | 0 | 19.6K | -19.6K | -100.0% | 0.0% | Sold Out | 51 |
| Winton Group | 4 | 0 | 27.4K | -27.4K | -100.0% | 0.0% | Sold Out | 50 |
| Engineers Gate | 4 | 32.2K | 0 | +32.2K | — | 0.0% | New | 50 |
| Brevan Howard Capital Management | 3 | 15.8K | 0 | +15.8K | — | 0.0% | New | 49 |
| Quantbot Technologies | 4 | 34.2K | 0 | +34.2K | — | 0.1% | New | 48 |
| MILLENNIUM MANAGEMENT LLC | 2 | 153.2K | 494.7K | -341.5K | -69.0% | 0.0% | Reduced | 48 |
| Man Group | 3 | 416.4K | 1.9M | -1.49M | -78.2% | 0.0% | Reduced | 47 |
| Bridgewater Associates | 1 | 43.5K | 106.6K | -63.1K | -59.2% | 0.0% | Reduced | 47 |
| ExodusPoint Capital Management | 3 | 5.0K | 62.5K | -57.5K | -92.1% | 0.0% | Reduced | 46 |
| D. E. Shaw & Co., Inc. | 1 | 39.1K | 83.3K | -44.2K | -53.1% | 0.0% | Reduced | 42 |
| Quadrature Capital | 3 | 27.3K | 89.7K | -62.3K | -69.5% | 0.0% | Reduced | 41 |
| Walleye Capital | 3 | 25.6K | 56.6K | -31.0K | -54.7% | 0.0% | Reduced | 36 |
| Gotham Asset Management, LLC | 2 | 2.5M | 3.4M | -839.7K | -25.0% | 0.4% | Reduced | 35 |
| TWO SIGMA INVESTMENTS, LP | 2 | 363.7K | 402.4K | -38.7K | -9.6% | 0.0% | Reduced | 30 |
| Jain Global | 3 | 18.4K | 13.7K | +4.7K | +34.5% | 0.0% | Increased | 29 |
| Aquatic Capital Management | 4 | 62.2K | 100.6K | -38.4K | -38.2% | 0.1% | Reduced | 29 |
Every fund above opens. Subscribers can see any manager's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
Sign in or subscribeHedge funds are identified from their 13F filings, which are due 45 days after quarter end and cover long U.S.-listed equity positions only. A fund's short book never appears, so a reduced position can mean a changed view or a changed hedge — the filing doesn't say which.