AMBA Ambarella, Inc.
Ambarella, Inc. (AMBA) 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 |
|---|---|---|---|---|---|---|
| CITADEL ADVISORS LLC Quant | Sold Out | -931.9K | -100.0% | $80.0M | 0.0% | 64 |
| Hawk Ridge Capital Management Long/Short | Sold Out | -276.1K | -100.0% | $23.7M | 0.0% | 62 |
| Balyasny Asset Management L.P. | Sold Out | -289.8K | -100.0% | $24.9M | 0.0% | 61 |
| MARSHALL WACE, LLP Long/Short | Sold Out | -249.5K | -100.0% | $21.4M | 0.0% | 60 |
| MILLENNIUM MANAGEMENT LLC | Reduced | -1.47M | -97.3% | $126.2M | 0.0% | 59 |
| Woodline Partners LP Long/Short | Sold Out | -349.5K | -100.0% | $30.0M | 0.0% | 58 |
| Quadrature Capital Quant | New | +117.7K | — | $10.1M | 0.1% | 57 |
| Magnetar Capital Event Quant | Sold Out | -17.0K | -100.0% | $1.5M | 0.0% | 56 |
| D. E. Shaw & Co., Inc. Quant | Increased | +269.9K | +110.1% | $23.2M | 0.0% | 56 |
| Capital Fund Management Quant Macro | New | +21.4K | — | $1.8M | 0.0% | 55 |
Most significant buyers
By move score, not size.
- Quadrature Capital
- D. E. Shaw & Co., Inc.
- Capital Fund Management
- Lighthouse Investment Partners
- Caption Management
Most significant sellers
By move score, not size.
- CITADEL ADVISORS LLC
- Hawk Ridge Capital Management
- Balyasny Asset Management L.P.
- MARSHALL WACE, LLP
- MILLENNIUM MANAGEMENT LLC
Hedge fund positions
| Fund | Tier | Shares | Previous | Change | Change % | Portfolio wt. | Action | Score |
|---|---|---|---|---|---|---|---|---|
| CITADEL ADVISORS LLC | 1 | 0 | 931.9K | -931.9K | -100.0% | 0.0% | Sold Out | 64 |
| Hawk Ridge Capital Management | 2 | 0 | 276.1K | -276.1K | -100.0% | 0.0% | Sold Out | 62 |
| Balyasny Asset Management L.P. | 2 | 0 | 289.8K | -289.8K | -100.0% | 0.0% | Sold Out | 61 |
| MARSHALL WACE, LLP | 2 | 0 | 249.5K | -249.5K | -100.0% | 0.0% | Sold Out | 60 |
| MILLENNIUM MANAGEMENT LLC | 2 | 41.3K | 1.5M | -1.47M | -97.3% | 0.0% | Reduced | 59 |
| Woodline Partners LP | 2 | 0 | 349.5K | -349.5K | -100.0% | 0.0% | Sold Out | 58 |
| Quadrature Capital | 3 | 117.7K | 0 | +117.7K | — | 0.1% | New | 57 |
| Magnetar Capital | 2 | 0 | 17.0K | -17.0K | -100.0% | 0.0% | Sold Out | 56 |
| D. E. Shaw & Co., Inc. | 1 | 515.1K | 245.2K | +269.9K | +110.1% | 0.0% | Increased | 56 |
| Capital Fund Management | 3 | 21.4K | 0 | +21.4K | — | 0.0% | New | 55 |
| Lighthouse Investment Partners | 3 | 23.4K | 0 | +23.4K | — | 0.1% | New | 53 |
| Trexquant Investment | 3 | 0 | 49.3K | -49.3K | -100.0% | 0.0% | Sold Out | 53 |
| Caption Management | 3 | 18.0K | 0 | +18.0K | — | 0.1% | New | 52 |
| ExodusPoint Capital Management | 3 | 0 | 8.7K | -8.7K | -100.0% | 0.0% | Sold Out | 52 |
| Point72 Asset Management, L.P. | 1 | 117.9K | 521.2K | -403.3K | -77.4% | 0.0% | Reduced | 52 |
| Qube Research & Technologies Ltd | 2 | 61.1K | 13.7K | +47.4K | +347.3% | 0.0% | Increased | 51 |
| Schonfeld Strategic Advisors | 3 | 0 | 6.1K | -6.1K | -100.0% | 0.0% | Sold Out | 51 |
| Readystate Asset Management | 3 | 3.6K | 0 | +3.6K | — | 0.0% | New | 50 |
| Walleye Capital | 3 | 5.1K | 210.9K | -205.9K | -97.6% | 0.0% | Reduced | 49 |
| Centiva Capital | 4 | 2.5K | 0 | +2.5K | — | 0.0% | New | 48 |
| Quantbot Technologies | 4 | 0 | 25.2K | -25.2K | -100.0% | 0.0% | Sold Out | 47 |
| Winton Group | 4 | 32.1K | 5.2K | +26.9K | +517.3% | 0.1% | Increased | 45 |
| Engineers Gate | 4 | 3.0K | 93.9K | -90.9K | -96.8% | 0.0% | Reduced | 43 |
| RENAISSANCE TECHNOLOGIES LLC | 1 | 110.3K | 199.4K | -89.1K | -44.7% | 0.0% | Reduced | 41 |
| TWO SIGMA INVESTMENTS, LP | 2 | 5.5K | 12.8K | -7.3K | -57.2% | 0.0% | Reduced | 40 |
| Holocene Advisors, LP | 2 | 51.9K | 35.5K | +16.4K | +46.3% | 0.0% | Increased | 38 |
| Brevan Howard Capital Management | 3 | 11.6K | 30.8K | -19.2K | -62.4% | 0.0% | Reduced | 36 |
| Boothbay Fund Management | 4 | 6.5K | 14.8K | -8.3K | -56.1% | 0.0% | Reduced | 32 |
| Squarepoint Ops LLC | 2 | 358.9K | 460.6K | -101.7K | -22.1% | 0.1% | Reduced | 31 |
| Capstone Investment Advisors | 3 | 6.5K | 4.9K | +1.6K | +33.5% | 0.0% | Increased | 30 |
| Portolan Capital Management | 3 | 97.1K | 108.7K | -11.7K | -10.7% | 0.3% | Reduced | 27 |
| Graham Capital Management | 3 | 4.5K | 5.4K | -870 | -16.2% | 0.0% | Reduced | 22 |
| Man Group | 3 | 29.5K | 29.0K | +558 | +1.9% | 0.0% | Increased | 21 |
| AQR Capital Management | 3 | 495.6K | 495.8K | -232 | -+0.0% | 0.0% | Reduced | 20 |
| Y-Intercept | 4 | 42.7K | 43.1K | -322 | -0.7% | 0.1% | Reduced | 18 |
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.