MLAB Mesa Laboratories, Inc.
Mesa Laboratories, Inc. (MLAB) 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 | -235.9K | -100.0% | $23.5M | 0.0% | 62 |
| Qube Research & Technologies Ltd Quant | New | +37.4K | — | $3.7M | 0.0% | 57 |
| MARSHALL WACE, LLP Long/Short | New | +8.7K | — | $870.1K | 0.0% | 56 |
| Squarepoint Ops LLC Quant | Sold Out | -3.2K | -100.0% | $317.3K | 0.0% | 54 |
| Magnetar Capital Event Quant | New | +4.1K | — | $412.0K | 0.0% | 54 |
| CITADEL ADVISORS LLC Quant | Increased | +27.5K | +326.1% | $2.7M | 0.0% | 54 |
| Tudor Investment Corporation Macro | Sold Out | -6.9K | -100.0% | $684.3K | 0.0% | 53 |
| Trexquant Investment Quant | Sold Out | -18.7K | -100.0% | $1.9M | 0.0% | 53 |
| Brevan Howard Capital Management Macro | New | +4.5K | — | $446.9K | 0.0% | 49 |
| Man Group Event Long/Short | Increased | +21.6K | +871.7% | $2.1M | 0.0% | 48 |
Most significant buyers
By move score, not size.
- Qube Research & Technologies Ltd
- MARSHALL WACE, LLP
- Magnetar Capital
- CITADEL ADVISORS LLC
- Brevan Howard Capital Management
Most significant sellers
By move score, not size.
- Select Equity Group
- Squarepoint Ops LLC
- Tudor Investment Corporation
- Trexquant Investment
- Quantbot Technologies
Hedge fund positions
| Fund | Tier | Shares | Previous | Change | Change % | Portfolio wt. | Action | Score |
|---|---|---|---|---|---|---|---|---|
| Select Equity Group | 1 | 0 | 235.9K | -235.9K | -100.0% | 0.0% | Sold Out | 62 |
| Qube Research & Technologies Ltd | 2 | 37.4K | 0 | +37.4K | — | 0.0% | New | 57 |
| MARSHALL WACE, LLP | 2 | 8.7K | 0 | +8.7K | — | 0.0% | New | 56 |
| Squarepoint Ops LLC | 2 | 0 | 3.2K | -3.2K | -100.0% | 0.0% | Sold Out | 54 |
| Magnetar Capital | 2 | 4.1K | 0 | +4.1K | — | 0.0% | New | 54 |
| CITADEL ADVISORS LLC | 1 | 35.9K | 8.4K | +27.5K | +326.1% | 0.0% | Increased | 54 |
| Tudor Investment Corporation | 2 | 0 | 6.9K | -6.9K | -100.0% | 0.0% | Sold Out | 53 |
| Trexquant Investment | 3 | 0 | 18.7K | -18.7K | -100.0% | 0.0% | Sold Out | 53 |
| Brevan Howard Capital Management | 3 | 4.5K | 0 | +4.5K | — | 0.0% | New | 49 |
| Man Group | 3 | 24.1K | 2.5K | +21.6K | +871.7% | 0.0% | Increased | 48 |
| TWO SIGMA INVESTMENTS, LP | 2 | 29.2K | 16.4K | +12.9K | +78.7% | 0.0% | Increased | 47 |
| Engineers Gate | 4 | 14.7K | 3.8K | +11.0K | +291.2% | 0.0% | Increased | 44 |
| D. E. Shaw & Co., Inc. | 1 | 81.8K | 54.6K | +27.2K | +49.8% | 0.0% | Increased | 41 |
| Point72 Asset Management, L.P. | 1 | 22.5K | 16.3K | +6.2K | +38.0% | 0.0% | Increased | 38 |
| Quantbot Technologies | 4 | 64 | 409 | -345 | -84.4% | 0.0% | Reduced | 35 |
| Y-Intercept | 4 | 10.0K | 6.3K | +3.7K | +58.5% | 0.0% | Increased | 32 |
| RENAISSANCE TECHNOLOGIES LLC | 1 | 28.9K | 31.6K | -2.7K | -8.5% | 0.0% | Reduced | 29 |
| CenterBook Partners | 4 | 7.7K | 14.2K | -6.5K | -45.5% | 0.0% | Reduced | 29 |
| AQR Capital Management | 3 | 203.7K | 170.6K | +33.2K | +19.5% | 0.0% | Increased | 27 |
| Quadrature Capital | 3 | 7.7K | 8.7K | -1.0K | -11.6% | 0.0% | Reduced | 24 |
| Graham Capital Management | 3 | 2.9K | 3.3K | -470 | -14.1% | 0.0% | Reduced | 22 |
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.