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Rhythm Pharmaceuticals Ownership | Who Owns Rhythm Pharmaceuticals?

OverviewForecastRevenueFinancialsChartTranscripts

Rhythm Pharmaceuticals Ownership Summary

Rhythm Pharmaceuticals is owned by 16.61% institutional investors, 0.64% insiders, and 82.74% retail investors. Perceptive advisors is the largest institutional shareholder, holding 658.10% of RYTM shares. PRIMECAP Odyssey Aggressive Growth is the top mutual fund, with 4.68% of its assets in Rhythm Pharmaceuticals shares.

RYTM Ownership Benchmark

TypeName% Inst% Insiders% Retail
StockRhythm Pharmaceuticals16.61%0.64%82.74%
SectorHealthcare Stocks 42.54%10.83%46.63%
IndustryBiotech Stocks 45.22%10.75%44.04%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

HolderShares% HoldingValue
Perceptive advisors419.10M658.10%$288.39M
Blackrock6.74M11.21%$276.82M
Blackrock funding, inc. /de6.30M9.90%$636.46M
Ra capital management5.68M8.92%$573.76M
Baker bros. advisors lp5.60M8.80%$566.00M
Vanguard group5.00M7.85%$504.59M
Primecap management co/ca/4.26M6.69%$430.51M
Nea management company2.91M4.57%$293.88M
Fmr2.15M3.37%$216.64M
State street2.03M3.19%$204.87M

Top Institutional Shareholders by % of Total Assets

HolderShares% AssetsValue
Checkpoint capital763.71K25.84%$77.13M
Nea management company2.91M16.13%$293.88M
Perceptive advisors419.10M8.33%$288.39M
Nan fung group49.12K8.32%$4.96M
Ra capital management5.68M7.07%$573.76M
Opaleye management461.70K6.59%$46.63M
Silverarc capital management370.00K5.04%$37.37M
Rock springs capital management lp717.10K4.23%$72.42M
Baker bros. advisors lp5.60M4.09%$566.00M
Siren499.98K1.98%$50.49M

Top Buyers

HolderShares% AssetsChange
Perceptive advisors419.10M8.33%416.69M
Vanguard group5.00M0.01%1.41M
Alliancebernstein979.68K0.03%918.21K
Janus henderson group1.22M0.03%621.43K
Capital research global investors598.25K0.01%598.25K

Top Sellers

HolderShares% AssetsChange
Healthcare of ontario pension plan trust fund---1.11M
Frazier life sciences management---678.76K
Commodore capital lp---650.00K
Primecap management co/ca/4.26M0.33%-615.18K
Westfield capital management co lp1.07M0.45%-560.46K

New Positions

HolderShares% AssetsChangeValue
Capital research global investors598.25K0.01%598.25K$60.42M
Jennison associates411.55K0.02%411.55K$41.56M
Norges bank205.65K0.00%205.65K$11.51M
First light asset management180.48K1.72%180.48K$18.23M
Nomura157.30K0.01%157.30K$6.46M

Sold Out

HolderChange
Ifp advisors-1.00
Twin peaks wealth advisors-5.00
Innealta capital-7.00
Hexagon capital partners-11.00
Whipplewood advisors-11.00

Institutional Ownership Trends

DateHoldingsChange %SharesChange %OwnershipChange %Increased PositionChange %Decreased PositionChange %
Sep 30, 202584-63.48%10,580,828-83.50%160.16%42-65.85%29-60.27%
Jun 30, 2025236-0.42%66,529,0344.29%1041.02%124-3.88%767.04%
Mar 31, 202523812.26%64,653,938-0.38%1020.91%13011.11%7226.32%
Dec 31, 20241975.35%58,110,291-14.09%940.78%11220.43%50-12.28%
Sep 30, 20241877.47%67,638,955-2.40%1100.83%933.33%579.62%

Top Mutual Funds Shareholders

HolderShares% HoldingChange
PRIMECAP Odyssey Aggressive Growth3.09M4.68%-779.65K
Vanguard Total Stock Mkt Idx Inv2.02M3.05%-51.22K
Vanguard US Total Market Shares ETF1.92M3.03%2.33K
PRIMECAP Odyssey Growth1.53M2.32%-111.43K
iShares Russell 2000 ETF1.31M1.98%-
Polar Capital Biotech S Inc1.25M1.89%-
Federated Hermes Kaufmann Small Cap A742.00K1.12%1.93K
Federated Hermes Kaufmann Small Cap Grow742.00K1.12%1.93K
Federated Hermes Kaufmann R733.00K1.11%41.70K
Federated Hermes Kaufmann Growth733.00K1.11%41.70K

Recent Insider Transactions

DateNameRoleActivityValue
Nov 20, 2025Cramer Pamela J. Chief Human Resources OfficerSell$351.75K
Nov 07, 2025Cramer Pamela J. Chief Human Resources OfficerSell$1.91M
Nov 10, 2025Cramer Pamela J. Chief Human Resources OfficerSell$351.50K
Oct 30, 2025Shulman Joseph Chief Technical OfficerSell$1.12M
Oct 28, 2025Shulman Joseph Chief Technical OfficerSell$323.75K

Insider Transactions Trends

DateBuySell
2025 Q4-7
2025 Q3-19
2025 Q2-16
2025 Q1-35
2024 Q4-9

RYTM Ownership FAQ

Who Owns Rhythm Pharmaceuticals?

Rhythm Pharmaceuticals shareholders are primarily institutional investors at 16.61%, followed by 0.64% insiders and 82.75% retail investors. The average institutional ownership in Rhythm Pharmaceuticals's industry, Biotech Stocks , is 45.22%, which Rhythm Pharmaceuticals falls below.

Who owns the most shares of Rhythm Pharmaceuticals?

Rhythm Pharmaceuticals’s largest shareholders are Perceptive advisors (419.1M shares, 658.10%), Blackrock (6.74M shares, 11.21%), and Blackrock funding, inc. /de (6.3M shares, 9.90%). Together, they hold 679.20% of Rhythm Pharmaceuticals’s total shares outstanding.

Does Blackrock own Rhythm Pharmaceuticals?

Yes, BlackRock owns 11.21% of Rhythm Pharmaceuticals, totaling 6.74M shares as of Jun 2024. This represents 0.01% of BlackRock's total assets, with a market value of 276.82M$. In the last quarter, BlackRock increased its holdings by 212.28K shares, a 3.25% change.

Who is Rhythm Pharmaceuticals’s biggest shareholder by percentage of total assets invested?

Checkpoint capital is Rhythm Pharmaceuticals’s biggest shareholder by percentage of total assets invested, with 25.84% of its assets in 763.71K Rhythm Pharmaceuticals shares, valued at 77.13M$.

Who is the top mutual fund holder of Rhythm Pharmaceuticals shares?

PRIMECAP Odyssey Aggressive Growth is the top mutual fund holder of Rhythm Pharmaceuticals shares, with 4.68% of its total shares outstanding invested in 3.09M Rhythm Pharmaceuticals shares.

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