Rhythm Pharmaceuticals Ownership | Who Owns Rhythm Pharmaceuticals?

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Rhythm Pharmaceuticals Ownership Summary

Rhythm Pharmaceuticals is owned by 13.68% institutional investors, 0.81% insiders, and 85.51% 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 3.23% of its assets in Rhythm Pharmaceuticals shares.

RYTM Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Rhythm Pharmaceuticals	13.68%	0.81%	85.51%
Sector	Healthcare Stocks	232.64%	10.66%	-143.30%
Industry	Biotech Stocks	382.13%	10.41%	-292.54%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Perceptive advisors	419.10M	658.10%	$288.39M
Blackrock	6.74M	11.21%	$276.82M
Blackrock funding, inc. /de	6.30M	9.79%	$674.07M
Vanguard group	6.21M	9.65%	$664.82M
Ra capital management	5.68M	8.92%	$573.76M
Baker bros. advisors lp	5.60M	8.80%	$566.00M
Primecap management co/ca/	3.48M	5.41%	$372.36M
Nea management company	2.91M	4.57%	$293.88M
Fmr	2.15M	3.37%	$216.64M
State street	2.03M	3.19%	$204.87M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Checkpoint capital	763.71K	25.84%	$77.13M
Nea management company	2.91M	16.13%	$293.88M
Perceptive advisors	419.10M	8.33%	$288.39M
Nan fung group	49.12K	8.32%	$4.96M
Ra capital management	5.68M	7.07%	$573.76M
Opaleye management	461.70K	6.59%	$46.63M
Rock springs capital management lp	717.10K	4.23%	$72.42M
Baker bros. advisors lp	5.60M	4.09%	$566.00M
Silverarc capital management	135.95K	2.02%	$14.55M
Siren	499.98K	1.98%	$50.49M

Top Buyers

Holder	Shares	% Assets	Change
Perceptive advisors	419.10M	8.33%	416.69M
Vanguard group	6.21M	0.01%	1.21M
Alliancebernstein	979.68K	0.03%	918.21K
Janus henderson group	1.22M	0.03%	621.43K
Jennison associates	918.57K	0.06%	507.02K

Top Sellers

Holder	Shares	% Assets	Change
Healthcare of ontario pension plan trust fund	-	-	-1.11M
Primecap management co/ca/	3.48M	0.28%	-784.19K
Frazier life sciences management	-	-	-678.76K
Commodore capital lp	-	-	-650.00K
National bank of canada /fi/	-	-	-341.51K

New Positions

Holder	Shares	% Assets	Change	Value
First light asset management	180.48K	1.72%	180.48K	$18.23M
Nomura	157.30K	0.01%	157.30K	$6.46M
M&g	137.07K	0.08%	137.07K	$14.67M
Man group	129.33K	0.02%	129.33K	$13.06M
Capital world investors	115.69K	0.00%	115.69K	$12.38M

Sold Out

Holder	Change
Wealthspire 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

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Dec 31, 2025	78	-71.53%	8,801,414	-87.66%	13	0.11%	45	-71.88%	21	-73.42%
Sep 30, 2025	84	-63.48%	10,580,828	-83.50%	16	0.16%	42	-65.85%	29	-60.27%
Jun 30, 2025	236	-0.42%	66,529,034	4.29%	104	1.02%	124	-3.88%	76	7.04%
Mar 31, 2025	238	12.26%	64,653,938	-0.38%	102	0.91%	130	11.11%	72	26.32%
Dec 31, 2024	197	5.35%	58,110,291	-14.09%	94	0.78%	112	20.43%	50	-12.28%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
PRIMECAP Odyssey Aggressive Growth	2.16M	3.23%	-522.28K
Vanguard Total Stock Mkt Idx Inv	2.11M	3.10%	4.17K
Vanguard US Total Market Shares ETF	1.92M	3.03%	2.33K
Vanguard Small Cap Index	1.52M	2.22%	4.07K
iShares Russell 2000 ETF	1.29M	1.88%	1.29M
PRIMECAP Odyssey Growth	1.13M	1.70%	-206.60K
American Funds SMALLCAP World A	987.85K	1.48%	457.45K
Polar Capital Biotech S Inc	1.00M	1.46%	1.00M
State Street® SPDR® S&P® Biotech ETF	929.87K	1.36%	5.12K
Vanguard Small Cap Growth Index Inv	841.70K	1.23%	1.37K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Mar 04, 2026	German Christopher Paul	Corporate Controller & CAO	Sell	$502.79K
Feb 17, 2026	Smith Hunter C	Chief Financial Officer	Sell	$91.53K
Feb 17, 2026	Smith Hunter C	Chief Financial Officer	Sell	$20.10K
Feb 17, 2026	Smith Hunter C	Chief Financial Officer	Sell	$119.30K
Feb 17, 2026	Smith Hunter C	Chief Financial Officer	Sell	$110.11K

Insider Transactions Trends

Date	Buy	Sell
2026 Q1	-	24
2025 Q4	-	9
2025 Q3	-	19
2025 Q2	-	16
2025 Q1	-	35

RYTM Ownership FAQ

Who Owns Rhythm Pharmaceuticals?

Rhythm Pharmaceuticals shareholders are primarily institutional investors at 13.68%, followed by 0.81% insiders and 85.51% retail investors. The average institutional ownership in Rhythm Pharmaceuticals's industry, Biotech Stocks , is 382.13%, 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, 9.79%). Together, they hold 679.09% 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 3.23% of its total shares outstanding invested in 2.16M Rhythm Pharmaceuticals shares.

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