RHYTHM PHARMACEUTICALS, INC.

RYTMNASDAQ

$92.45-0.38 (-0.41% today)

Legend

Insider buy

Insider sell

Congress buy

Congress sell

Hedge Funds
bought vs soldGreener markers show more buyers; redder markers show more sellers.

Company share activityNet buybacksNo changeNet dilution

Marker size reflects transaction size.

Insider buy
Insider sell
Congress buy
Congress sell
Hedge Funds bought vs sold

Share activityNet buybacksNo changeNet dilution

Marker size reflects transaction size. Greener fund markers mean more buyers.

Insider Buy
Insider Sell
Congress Buy
Congress Sell
Hedge funds bought vs sold
BuybackNo changeNet dilution

RHYTHM PHARMACEUTICALS, INC. price and activity chart data

Showing the 1Y range: Oct 6, 2025 to Oct 5, 2026. Price (-5.5%). 0 insider or congressional trades plotted in this window as 0 markers; nearby trades of the same kind are grouped.

Transactions plotted on the price chart
Date	Category	Person	Role	Action	Amount	Change in holding

Largest institutional holders

13F · Q2 2026

Fund	% of company held	Value	% of portfolio	Quarterly activity
Ra Capital Management, L.P.	9.69%	$740M	6.43%	Not reported
BlackRock, Inc.	8.95%	$684M	0.01%	Not reported
Baker Bros. Advisors LP	8.14%	$622M	3.12%	Not reported
Primecap Management Co	4.60%	$352M	0.21%	Reduce 7.28%
Vanguard Portfolio Management LLC	4.56%	$348M	0.02%	Not reported
Vanguard Capital Management LLC	4.37%	$334M	0.01%	Not reported
JPMorgan Chase & Co	3.85%	$292M	0.02%	Not reported
Perceptive Advisors LLC	3.76%	$287M	4.31%	Add 8.95%
State Street Corp	3.74%	$286M	0.01%	Not reported
Westfield Capital Management Co LP	3.21%	$245M	0.80%	Add 14.49%
Goldman Sachs Group Inc	3.09%	$236M	0.02%	Not reported
Federated Hermes, Inc.	2.59%	$198M	0.29%	Not reported
Polar Capital Holdings Plc	2.42%	$185M	0.44%	Add 2.97%
Geode Capital Management, LLC	2.23%	$170M	0.01%	Not reported
Capital Research Global Investors	2.23%	$170M	0.02%	Not reported
Citadel Advisors LLC	1.84%	$140M	0.02%	Not reported
Checkpoint Capital L.P.	1.72%	$132M	33.79%	Reduce 3.36%
Siren, L.L.C.	1.65%	$126M	2.55%	Add 56.62%
Morgan Stanley	1.62%	$123M	0.01%	Not reported
FMR LLC	1.49%	$114M	0.00%	Not reported
Pictet Asset Management Holding SA	1.39%	$106M	0.10%	Add 43.59%
Jupiter Topco LLC	1.34%	$103M	0.04%	Not reported
Alliancebernstein L.P.	1.30%	$77.8M	0.03%	Not reported
Woodline Partners LP	1.10%	$84.3M	0.26%	Not reported
Clearbridge Investments, LLC	1.01%	$77.3M	0.06%	Not reported
Rock Springs Capital Management LP	1.01%	$76.9M	3.75%	Add 0.41%
Norges Bank	1.00%	$76.1M	0.01%	Not reported
Charles Schwab Investment Management Inc	0.80%	$61.4M	0.01%	Not reported
Integral Health Asset Management, LLC	0.80%	$61.1M	2.41%	Reduce 8.33%
Invesco Ltd.	0.79%	$60.3M	0.00%	Not reported
Northern Trust Corp	0.79%	$60M	0.01%	Not reported
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	0.75%	$57.2M	0.01%	Not reported
Wellington Management Group LLP	0.71%	$54.3M	0.01%	Add 78.53%
Vanguard Fiduciary Trust Co	0.65%	$49.5M	0.01%	Not reported
Loomis Sayles & Co L P	0.63%	$48.2M	0.06%	Reduce 6.67%
Squarepoint Ops LLC	0.61%	$47M	0.05%	Not reported
Point72 Asset Management, L.P.	0.60%	$46M	0.05%	Not reported
Sofinnova Investments, Inc.	0.59%	$45.3M	2.34%	Reduce 9.35%
Ameriprise Financial Inc	0.58%	$44.6M	0.01%	Not reported
Adage Capital Partners GP, L.L.C.	0.58%	$44.1M	0.06%	Reduce 45.30%
Bank of New York Mellon Corp	0.57%	$43.8M	0.01%	Not reported
Braidwell LP	0.55%	$42.3M	1.57%	Add 22.70%
Assenagon Asset Management S.A.	0.54%	$41.4M	0.03%	Not reported
Artisan Partners Limited Partnership	0.52%	$39.4M	0.06%	Reduce 9.18%
Bank of America Corp	0.47%	$36.1M	0.00%	Not reported
Orbimed Advisors LLC	0.47%	$35.9M	0.66%	Not reported
Millennium Management LLC	0.46%	$35.2M	0.01%	Not reported
Silverarc Capital Management, LLC	0.45%	$34.6M	3.59%	Add 1.78%
Voya Investment Management LLC	0.40%	$30.3M	0.03%	Not reported
Capital World Investors	0.32%	$24.6M	0.00%	Add 91.41%

50 of 281 holders

Activity score

Premium

100

WEAK

STRONG

Unlock

AI Activity Analysis

Premium

Coming soonAI reads of insider, institutional and company activity will appear here for Premium accounts.

Historical Activity Patterns

Premium

Historical Activity PatternsHistorical periods where multiple activity categories converged, with subsequent market performance shown for context.Unlock