MBX MBX Biosciences, Inc.

NASDAQ
$59.49

MBX Biosciences, Inc. (MBX) 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
-33.33
9 buyers / 18 sellers
STRONG SELLING
Funds compared
27
funds with comparable MBX positions
20 current holders · 23 prior-quarter holders
Net share change
-1.43M
+3.40M added, -4.83M cut
Position activity
4 new 5 increased 11 reduced 7 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
Paradigm BioCapital Advisors Growth Healthcare New +2.51M — $138.4M 2.6% 80
CITADEL ADVISORS LLC Quant Sold Out -932.8K -100.0% $51.5M 0.0% 64
Caligan Partners Activist Event Reduced -648.6K -76.4% $35.8M 0.5% 63
Soleus Capital Management Growth Healthcare Increased +336.4K +188.0% $18.6M 1.0% 60
Squarepoint Ops LLC Quant Sold Out -97.2K -100.0% $5.4M 0.0% 57
Qube Research & Technologies Ltd Quant Sold Out -17.2K -100.0% $948.7K 0.0% 55
Moore Capital Management Macro New +64.9K — $3.6M 0.1% 55
MARSHALL WACE, LLP Long/Short Increased +339.2K +540.9% $18.7M 0.0% 54
ExodusPoint Capital Management Long/Short Quant Sold Out -28.1K -100.0% $1.6M 0.0% 54
Verition Fund Management Event Long/Short Sold Out -10.2K -100.0% $564.3K 0.0% 54

Most significant buyers

By move score, not size.

  • Paradigm BioCapital Advisors New · +2.51M
  • Soleus Capital Management Increased · +336.4K
  • Moore Capital Management New · +64.9K
  • MARSHALL WACE, LLP Increased · +339.2K
  • Brevan Howard Capital Management New · +8.6K

Most significant sellers

By move score, not size.

  • CITADEL ADVISORS LLC Sold Out · -932.8K
  • Caligan Partners Reduced · -648.6K
  • Squarepoint Ops LLC Sold Out · -97.2K
  • Qube Research & Technologies Ltd Sold Out · -17.2K
  • ExodusPoint Capital Management Sold Out · -28.1K

Hedge fund positions

Fund Tier Shares Previous Change Change % Portfolio wt. Action Score
Paradigm BioCapital Advisors 1 2.5M 0 +2.51M — 2.6% New 80
CITADEL ADVISORS LLC 1 0 932.8K -932.8K -100.0% 0.0% Sold Out 64
Caligan Partners 2 200.0K 848.6K -648.6K -76.4% 0.5% Reduced 63
Soleus Capital Management 2 515.3K 178.9K +336.4K +188.0% 1.0% Increased 60
Squarepoint Ops LLC 2 0 97.2K -97.2K -100.0% 0.0% Sold Out 57
Qube Research & Technologies Ltd 2 0 17.2K -17.2K -100.0% 0.0% Sold Out 55
Moore Capital Management 3 64.9K 0 +64.9K — 0.1% New 55
MARSHALL WACE, LLP 2 401.9K 62.7K +339.2K +540.9% 0.0% Increased 54
ExodusPoint Capital Management 3 0 28.1K -28.1K -100.0% 0.0% Sold Out 54
Verition Fund Management 2 0 10.2K -10.2K -100.0% 0.0% Sold Out 54
Deep Track Capital 1 1.7M 2.8M -1.03M -37.2% 1.4% Reduced 53
Braidwell 2 710.9K 1.5M -781.6K -52.4% 1.5% Reduced 51
OrbiMed Advisors 2 3.4M 3.6M -209.2K -5.7% 3.6% Reduced 49
Brevan Howard Capital Management 3 8.6K 0 +8.6K — 0.0% New 49
Aquatic Capital Management 4 0 10.2K -10.2K -100.0% 0.0% Sold Out 48
Engineers Gate 4 0 17.4K -17.4K -100.0% 0.0% Sold Out 48
Schonfeld Strategic Advisors 3 248.7K 123.8K +124.9K +100.8% 0.1% Increased 47
EcoR1 Capital 2 388.5K 777.0K -388.5K -50.0% 1.1% Reduced 46
MILLENNIUM MANAGEMENT LLC 2 226.2K 564.4K -338.3K -59.9% 0.0% Reduced 45
Quantbot Technologies 4 3.9K 0 +3.9K — 0.0% New 45
Affinity Asset Advisors 2 75.0K 150.0K -75.0K -50.0% 0.2% Reduced 40
D. E. Shaw & Co., Inc. 1 182.8K 288.9K -106.1K -36.7% 0.0% Reduced 38
Boothbay Fund Management 4 70.4K 208.0K -137.7K -66.2% 0.1% Reduced 37
Rock Springs Capital Management 3 298.2K 288.0K +10.3K +3.6% 0.8% Increased 27
TWO SIGMA INVESTMENTS, LP 2 113.5K 115.1K -1.6K -1.4% 0.0% Reduced 26
AQR Capital Management 3 22.6K 27.4K -4.8K -17.5% 0.0% Reduced 24
Woodline Partners LP 2 900.1K 900.1K +29 +0.0% 0.2% Increased 24

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.