OSS One Stop Systems, Inc.
One Stop Systems, Inc. (OSS) 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 |
|---|---|---|---|---|---|---|
| TWO SIGMA INVESTMENTS, LP Quant | New | +162.2K | — | $2.9M | 0.0% | 59 |
| MARSHALL WACE, LLP Long/Short | Sold Out | -419.0K | -100.0% | $7.6M | 0.0% | 58 |
| Qube Research & Technologies Ltd Quant | New | +318.9K | — | $5.8M | 0.0% | 57 |
| Hudson Bay Capital Management Event | Sold Out | -37.4K | -100.0% | $679.5K | 0.0% | 53 |
| LMR Partners Event Quant | New | +12.6K | — | $228.5K | 0.0% | 53 |
| Schonfeld Strategic Advisors Long/Short Quant | Sold Out | -29.5K | -100.0% | $535.9K | 0.0% | 51 |
| Squarepoint Ops LLC Quant | Increased | +72.9K | +124.6% | $1.3M | 0.0% | 51 |
| CITADEL ADVISORS LLC Quant | Reduced | -285.5K | -80.0% | $5.2M | 0.0% | 49 |
| Centiva Capital Long/Short Quant | Sold Out | -33.6K | -100.0% | $611.3K | 0.0% | 48 |
| Quantbot Technologies Quant | New | +6.1K | — | $110.6K | 0.0% | 45 |
Most significant buyers
By move score, not size.
- TWO SIGMA INVESTMENTS, LP
- Qube Research & Technologies Ltd
- LMR Partners
- Squarepoint Ops LLC
- Quantbot Technologies
Most significant sellers
By move score, not size.
- MARSHALL WACE, LLP
- Hudson Bay Capital Management
- Schonfeld Strategic Advisors
- CITADEL ADVISORS LLC
- Centiva Capital
Hedge fund positions
| Fund | Tier | Shares | Previous | Change | Change % | Portfolio wt. | Action | Score |
|---|---|---|---|---|---|---|---|---|
| TWO SIGMA INVESTMENTS, LP | 2 | 162.2K | 0 | +162.2K | — | 0.0% | New | 59 |
| MARSHALL WACE, LLP | 2 | 0 | 419.0K | -419.0K | -100.0% | 0.0% | Sold Out | 58 |
| Qube Research & Technologies Ltd | 2 | 318.9K | 0 | +318.9K | — | 0.0% | New | 57 |
| Hudson Bay Capital Management | 3 | 0 | 37.4K | -37.4K | -100.0% | 0.0% | Sold Out | 53 |
| LMR Partners | 3 | 12.6K | 0 | +12.6K | — | 0.0% | New | 53 |
| Schonfeld Strategic Advisors | 3 | 0 | 29.5K | -29.5K | -100.0% | 0.0% | Sold Out | 51 |
| Squarepoint Ops LLC | 2 | 131.3K | 58.5K | +72.9K | +124.6% | 0.0% | Increased | 51 |
| CITADEL ADVISORS LLC | 1 | 71.2K | 356.7K | -285.5K | -80.0% | 0.0% | Reduced | 49 |
| Centiva Capital | 4 | 0 | 33.6K | -33.6K | -100.0% | 0.0% | Sold Out | 48 |
| Quantbot Technologies | 4 | 6.1K | 0 | +6.1K | — | 0.0% | New | 45 |
| RENAISSANCE TECHNOLOGIES LLC | 1 | 407.9K | 260.0K | +147.9K | +56.9% | 0.0% | Increased | 44 |
| Brevan Howard Capital Management | 3 | 12.2K | 43.2K | -31.0K | -71.8% | 0.0% | Reduced | 36 |
| Trexquant Investment | 3 | 98.4K | 217.8K | -119.4K | -54.8% | 0.0% | Reduced | 35 |
| MILLENNIUM MANAGEMENT LLC | 2 | 337.7K | 400.7K | -63.0K | -15.7% | 0.0% | Reduced | 32 |
| Engineers Gate | 4 | 41.7K | 29.0K | +12.7K | +43.9% | 0.0% | Increased | 28 |
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.