PRTA Prothena Corporation plc

NASDAQ
$8.24

Prothena Corporation plc (PRTA) 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.

Hedge fund breadth
+12.00
14 buyers / 11 sellers
BUYING
Funds compared
27
funds with comparable PRTA positions
23 current holders · 23 prior-quarter holders
Net share change
-457.4K
+1.11M added, -1.57M cut
Position activity
4 new 10 increased 7 reduced 4 exited

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
Point72 Asset Management, L.P. Sold Out -399.8K -100.0% $3.9M 0.0% 61
Armistice Capital Long/Short Healthcare Sold Out -439.4K -100.0% $4.3M 0.0% 55
Walleye Capital Long/Short Quant Sold Out -277.2K -100.0% $2.7M 0.0% 53
Quadrature Capital Quant New +10.0K — $98.0K 0.0% 52
MARSHALL WACE, LLP Long/Short Increased +146.3K +328.1% $1.4M 0.0% 52
Y-Intercept Quant Sold Out -100.8K -100.0% $986.9K 0.0% 48
Aquatic Capital Management Quant New +25.4K — $248.9K 0.0% 48
Engineers Gate Quant New +41.3K — $404.0K 0.0% 48
ExodusPoint Capital Management Long/Short Quant Increased +70.9K +634.2% $693.6K 0.0% 46
Quantbot Technologies Quant New +1.6K — $15.8K 0.0% 45

Most significant buyers

By move score, not size.

  • Quadrature Capital New · +10.0K
  • MARSHALL WACE, LLP Increased · +146.3K
  • Aquatic Capital Management New · +25.4K
  • Engineers Gate New · +41.3K
  • ExodusPoint Capital Management Increased · +70.9K

Most significant sellers

By move score, not size.

  • Point72 Asset Management, L.P. Sold Out · -399.8K
  • Armistice Capital Sold Out · -439.4K
  • Walleye Capital Sold Out · -277.2K
  • Y-Intercept Sold Out · -100.8K
  • Palo Alto Investors Reduced · -65.4K

Hedge fund positions

Fund Tier Shares Previous Change Change % Portfolio wt. Action Score
Point72 Asset Management, L.P. 1 0 399.8K -399.8K -100.0% 0.0% Sold Out 61
Armistice Capital 3 0 439.4K -439.4K -100.0% 0.0% Sold Out 55
Walleye Capital 3 0 277.2K -277.2K -100.0% 0.0% Sold Out 53
Quadrature Capital 3 10.0K 0 +10.0K — 0.0% New 52
MARSHALL WACE, LLP 2 190.8K 44.6K +146.3K +328.1% 0.0% Increased 52
Y-Intercept 4 0 100.8K -100.8K -100.0% 0.0% Sold Out 48
Aquatic Capital Management 4 25.4K 0 +25.4K — 0.0% New 48
Engineers Gate 4 41.3K 0 +41.3K — 0.0% New 48
ExodusPoint Capital Management 3 82.0K 11.2K +70.9K +634.2% 0.0% Increased 46
Quantbot Technologies 4 1.6K 0 +1.6K — 0.0% New 45
Schonfeld Strategic Advisors 3 50.4K 12.4K +38.0K +306.1% 0.0% Increased 45
Trexquant Investment 3 76.7K 24.5K +52.2K +212.6% 0.0% Increased 45
Man Group 3 678.1K 381.6K +296.5K +77.7% 0.0% Increased 42
Palo Alto Investors 2 1.1M 1.2M -65.4K -5.4% 1.6% Reduced 35
Qube Research & Technologies Ltd 2 791.2K 614.6K +176.6K +28.7% 0.0% Increased 33
CITADEL ADVISORS LLC 1 338.8K 435.6K -96.8K -22.2% 0.0% Reduced 32
AQR Capital Management 3 302.6K 204.0K +98.6K +48.3% 0.0% Increased 32
RENAISSANCE TECHNOLOGIES LLC 1 697.6K 607.5K +90.1K +14.8% 0.0% Increased 31
D. E. Shaw & Co., Inc. 1 1.6M 1.8M -151.9K -8.6% 0.0% Reduced 31
Graham Capital Management 3 18.5K 12.8K +5.7K +44.3% 0.0% Increased 29
ADAR1 Capital Management 3 1.6M 1.6M -26.9K -1.7% 0.8% Reduced 27
TWO SIGMA INVESTMENTS, LP 2 1.3M 1.2M +59.0K +4.9% 0.0% Increased 27
Squarepoint Ops LLC 2 224.0K 230.9K -6.9K -3.0% 0.0% Reduced 24
Tudor Investment Corporation 2 24.4K 24.5K -26 -0.1% 0.0% Reduced 23
Winton Group 4 30.5K 34.7K -4.2K -12.1% 0.0% Reduced 20
Rubric Capital Management 1 5.0M 5.0M 0 +0.0% 0.4% Unchanged 26
Quinn Opportunity Partners 4 50.0K 50.0K 0 +0.0% 0.0% Unchanged 13

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.

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Hedge 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.