MASS 908 Devices Inc.
908 Devices Inc. (MASS) 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 |
|---|---|---|---|---|---|---|
| MILLENNIUM MANAGEMENT LLC | Sold Out | -142.4K | -100.0% | $1.2M | 0.0% | 59 |
| D. E. Shaw & Co., Inc. Quant | New | +75.4K | — | $656.4K | 0.0% | 58 |
| TWO SIGMA INVESTMENTS, LP Quant | Sold Out | -44.1K | -100.0% | $383.9K | 0.0% | 57 |
| Magnetar Capital Event Quant | New | +13.8K | — | $120.2K | 0.0% | 54 |
| Schonfeld Strategic Advisors Long/Short Quant | New | +11.1K | — | $96.9K | 0.0% | 51 |
| Trexquant Investment Quant | Sold Out | -73.2K | -100.0% | $636.8K | 0.0% | 51 |
| Brevan Howard Capital Management Macro | New | +20.7K | — | $180.0K | 0.0% | 49 |
| Squarepoint Ops LLC Quant | Reduced | -175.5K | -82.3% | $1.5M | 0.0% | 46 |
| CITADEL ADVISORS LLC Quant | Reduced | -81.8K | -56.6% | $711.7K | 0.0% | 41 |
| RENAISSANCE TECHNOLOGIES LLC Quant | Reduced | -38.3K | -16.6% | $333.2K | 0.0% | 31 |
Most significant buyers
By move score, not size.
- D. E. Shaw & Co., Inc.
- Magnetar Capital
- Schonfeld Strategic Advisors
- Brevan Howard Capital Management
- Graham Capital Management
Most significant sellers
By move score, not size.
- MILLENNIUM MANAGEMENT LLC
- TWO SIGMA INVESTMENTS, LP
- Trexquant Investment
- Squarepoint Ops LLC
- CITADEL ADVISORS LLC
Hedge fund positions
| Fund | Tier | Shares | Previous | Change | Change % | Portfolio wt. | Action | Score |
|---|---|---|---|---|---|---|---|---|
| MILLENNIUM MANAGEMENT LLC | 2 | 0 | 142.4K | -142.4K | -100.0% | 0.0% | Sold Out | 59 |
| D. E. Shaw & Co., Inc. | 1 | 75.4K | 0 | +75.4K | — | 0.0% | New | 58 |
| TWO SIGMA INVESTMENTS, LP | 2 | 0 | 44.1K | -44.1K | -100.0% | 0.0% | Sold Out | 57 |
| Magnetar Capital | 2 | 13.8K | 0 | +13.8K | — | 0.0% | New | 54 |
| Schonfeld Strategic Advisors | 3 | 11.1K | 0 | +11.1K | — | 0.0% | New | 51 |
| Trexquant Investment | 3 | 0 | 73.2K | -73.2K | -100.0% | 0.0% | Sold Out | 51 |
| Brevan Howard Capital Management | 3 | 20.7K | 0 | +20.7K | — | 0.0% | New | 49 |
| Squarepoint Ops LLC | 2 | 37.7K | 213.2K | -175.5K | -82.3% | 0.0% | Reduced | 46 |
| CITADEL ADVISORS LLC | 1 | 62.7K | 144.5K | -81.8K | -56.6% | 0.0% | Reduced | 41 |
| RENAISSANCE TECHNOLOGIES LLC | 1 | 191.9K | 230.2K | -38.3K | -16.6% | 0.0% | Reduced | 31 |
| Graham Capital Management | 3 | 14.8K | 13.2K | +1.6K | +11.9% | 0.0% | Increased | 21 |
| AQR Capital Management | 3 | 103.9K | 104.4K | -497 | -0.5% | 0.0% | Reduced | 20 |
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.