RYTM Rhythm Pharmaceuticals, Inc.

NASDAQ
$102.44

Rhythm Pharmaceuticals, Inc. (RYTM) 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
-10.53
17 buyers / 21 sellers
SELLING
Funds compared
41
funds with comparable RYTM positions
35 current holders · 33 prior-quarter holders
Net share change
-1.20M
+762.7K added, -1.97M cut
Position activity
8 new 9 increased 15 reduced 6 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
Balyasny Asset Management L.P. Sold Out -53.0K -100.0% $5.9M 0.0% 59
Alyeska Investment Group, L.P. Sold Out -32.6K -100.0% $3.6M 0.0% 58
Perceptive Advisors Growth Healthcare Increased +212.5K +9.0% $23.6M 4.5% 58
Logos Global Management Growth Healthcare Reduced -325.0K -72.2% $36.1M 0.6% 57
Hudson Bay Capital Management Event Sold Out -9.1K -100.0% $1.0M 0.0% 55
Capital Fund Management Quant Macro New +68.5K — $7.6M 0.1% 55
Magnetar Capital Event Quant New +3.9K — $433.9K 0.0% 54
Schonfeld Strategic Advisors Long/Short Quant New +28.6K — $3.2M 0.0% 53
Trexquant Investment Quant New +56.2K — $6.2M 0.0% 53
Capstone Investment Advisors Quant Macro New +3.0K — $333.6K 0.0% 53

Most significant buyers

By move score, not size.

  • Perceptive Advisors Increased · +212.5K
  • Capital Fund Management New · +68.5K
  • Magnetar Capital New · +3.9K
  • Schonfeld Strategic Advisors New · +28.6K
  • Trexquant Investment New · +56.2K

Most significant sellers

By move score, not size.

  • Balyasny Asset Management L.P. Sold Out · -53.0K
  • Alyeska Investment Group, L.P. Sold Out · -32.6K
  • Logos Global Management Reduced · -325.0K
  • Hudson Bay Capital Management Sold Out · -9.1K
  • RENAISSANCE TECHNOLOGIES LLC Reduced · -189.7K

Hedge fund positions

Fund Tier Shares Previous Change Change % Portfolio wt. Action Score
Balyasny Asset Management L.P. 2 0 53.0K -53.0K -100.0% 0.0% Sold Out 59
Alyeska Investment Group, L.P. 2 0 32.6K -32.6K -100.0% 0.0% Sold Out 58
Perceptive Advisors 1 2.6M 2.4M +212.5K +9.0% 4.5% Increased 58
Logos Global Management 2 125.0K 450.0K -325.0K -72.2% 0.6% Reduced 57
Hudson Bay Capital Management 3 0 9.1K -9.1K -100.0% 0.0% Sold Out 55
Capital Fund Management 3 68.5K 0 +68.5K — 0.1% New 55
Magnetar Capital 2 3.9K 0 +3.9K — 0.0% New 54
Schonfeld Strategic Advisors 3 28.6K 0 +28.6K — 0.0% New 53
Trexquant Investment 3 56.2K 0 +56.2K — 0.0% New 53
Capstone Investment Advisors 3 3.0K 0 +3.0K — 0.0% New 53
Cinctive Capital Management 3 42.7K 0 +42.7K — 0.2% New 52
Walleye Capital 3 6.0K 0 +6.0K — 0.0% New 51
RENAISSANCE TECHNOLOGIES LLC 1 68.3K 258.0K -189.7K -73.5% 0.0% Reduced 50
Brevan Howard Capital Management 3 0 3.8K -3.8K -100.0% 0.0% Sold Out 49
ExodusPoint Capital Management 3 61.1K 17.8K +43.4K +244.0% 0.1% Increased 49
Y-Intercept 4 7.9K 0 +7.9K — 0.0% New 48
Centiva Capital 4 0 4.0K -4.0K -100.0% 0.0% Sold Out 48
Man Group 3 50.8K 4.0K +46.8K +1162.8% 0.0% Increased 48
Point72 Asset Management, L.P. 1 414.2K 846.8K -432.6K -51.1% 0.1% Reduced 46
Quantbot Technologies 4 0 1.4K -1.4K -100.0% 0.0% Sold Out 45
Squarepoint Ops LLC 2 422.9K 263.0K +160.0K +60.8% 0.1% Increased 43
Integral Health Asset Management 2 550.0K 600.0K -50.0K -8.3% 2.5% Reduced 43
Braidwell 2 381.1K 310.6K +70.5K +22.7% 1.6% Increased 41
Qube Research & Technologies Ltd 2 134.4K 277.9K -143.5K -51.6% 0.0% Reduced 41
Rock Springs Capital Management 3 692.6K 689.7K +2.9K +0.4% 3.8% Increased 41
ADAGE CAPITAL PARTNERS GP, L.L.C. 2 397.0K 725.7K -328.7K -45.3% 0.1% Reduced 40
ADAR1 Capital Management 3 136.2K 211.5K -75.3K -35.6% 0.8% Reduced 39
MILLENNIUM MANAGEMENT LLC 2 316.7K 451.8K -135.1K -29.9% 0.0% Reduced 38
CenterBook Partners 4 2.0K 9.0K -7.1K -78.1% 0.0% Reduced 37
CITADEL ADVISORS LLC 1 1.3M 1.4M -155.0K -10.9% 0.1% Reduced 34
OrbiMed Advisors 2 322.9K 314.1K +8.8K +2.8% 0.7% Increased 30
Tudor Investment Corporation 2 13.9K 19.6K -5.8K -29.3% 0.0% Reduced 30
MARSHALL WACE, LLP 2 8.2K 9.6K -1.5K -15.1% 0.0% Reduced 29
D. E. Shaw & Co., Inc. 1 30.2K 32.7K -2.5K -7.6% 0.0% Reduced 29
Aquatic Capital Management 4 19.8K 29.7K -9.9K -33.4% 0.1% Reduced 28
TWO SIGMA INVESTMENTS, LP 2 4.6K 4.3K +300 +7.0% 0.0% Increased 27
Gotham Asset Management, LLC 2 5.5K 4.8K +668 +13.8% 0.0% Increased 27
AQR Capital Management 3 59.2K 59.3K -71 -0.1% 0.0% Reduced 20
RA Capital Management 1 6.7M 6.7M 0 +0.0% 6.4% Unchanged 50
Baker Bros. Advisors 1 5.6M 5.6M 0 +0.0% 3.1% Unchanged 41
Woodline Partners LP 2 758.9K 758.9K 0 +0.0% 0.3% Unchanged 19

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.