$RYTM

$89.47 +$0.20 (0.22%) Close

$RYTM Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 68.9M shares outstanding

Who owns RYTM?

By type of holder

Institutions 100.0% Insiders 0.0% Everyone else 0.0%

Concentration Top 10 holders own 55.4%

Ra Capital Management, L.P. 9.7% · BlackRock, Inc. 8.9%

Institutional ownership

100.0%

0 pts vs last qtr

Institutional holders

302

+17 vs last qtr

Net shares bought

+3.6M

by institutions in Q2 2026

New / sold out

62 / 45

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Jpmorgan Chase & Co +1.1M
Jupiter Topco LLC NEW +925.5K

Biggest sellers in Q2 2026

Janus Henderson Group PLC SOLD OUT −918.2K
FMR LLC −663.8K

Who is planning to sell?

Notices of proposed sale, last 12 months

$48.5M

17 notices from 9 people

Shares covered

461.6K

0.67% of the company

Arranged in advance

81%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Hunter Smith Officer 10b5-1 $9.07M
Camille L Bedrosian Director $9.06M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2019–FY2025

+78.4%

+10.13% a year

Each share's claim on the business

−44.0%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $209M

over 7 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years59% 3–5 years10% 1–3 years20% Under 1 year11%

Quarterly turnover

11.3%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting RYTM on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
RC Ra Capital Management, L.P.	6.7M	9.68%	Unchanged	≤2021	6.4%
Shares held by quarter Peak holding6.7M (Q4'25) Change over 8 quarters+582.4K Share of the company9.680% Ra Capital Management, L.P.'s full portfolio →
B BlackRock, Inc.	6.2M	8.94%	−80.2K (−1.3%)	≤2021	0.0%
Shares held by quarter Peak holding7.0M (Q4'24) Change over 8 quarters−732.4K Share of the company8.940% BlackRock, Inc.'s full portfolio →

Ra Capital Management, L.P.

6.7M

% of company

9.68%

Change vs last qtr

Unchanged

Held since

≤2021

BlackRock, Inc.

6.2M

% of company

8.94%

Change vs last qtr

−80.2K (−1.3%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Rhythm Pharmaceuticals, Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting RYTM on Form N-PORT; together they hold 45.1% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$242M	2.2M	3.16%	0.01%	June 30, 2026
PO PRIMECAP Odyssey Aggressive Growth Fund PRIMECAP Odyssey Funds	$195M	2.0M	2.86%	2.64%	July 31, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$242M

% of company

3.16%

% of the fund

0.01%

As of

June 30, 2026

PRIMECAP Odyssey Aggressive Growth Fund

PRIMECAP Odyssey Funds

Position value

$195M

% of company

2.86%

% of the fund

2.64%

As of

July 31, 2026

23 more funds behind a free account

See every fund holding Rhythm Pharmaceuticals, Inc. and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
MD Meeker David P Insider	239.3K	0.35%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.350% Meeker David P's insider activity →
SH Smith Hunter C Insider	114.0K	0.17%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.170% Smith Hunter C's insider activity →

Meeker David P

Insider

239.3K

% of company

0.35%

Change vs last qtr

—

Held since

—

Smith Hunter C

Insider

114.0K

% of company

0.17%

Change vs last qtr

—

Held since

—

11 more holders behind a free account

See every insider and 5%+ holder of Rhythm Pharmaceuticals, Inc..

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