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RYTM · Rhythm Pharmaceuticals, Inc.

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$109.94 +1.02 (+0.94%)
Market Cap
$7.53B
Shares
68.85M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 301
Total Value: $8,591,916,453
Total Shares: 77,383,770

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 301 13F filers · Δ vs Mar 31, 2026
Top Holder
8.6%
Sep 2023 → Jun 2026 · range 8.6% – 12.1%
−0.4 pts
Top 5
32.0%
Sep 2023 → Jun 2026 · range 32.0% – 46.8%
−1.9 pts
Top 10
49.3%
Sep 2023 → Jun 2026 · range 49.3% – 66.4%
−0.2 pts
HHI
344
Sep 2023 → Jun 2026 · range 344 – 574
Broadly held−11

Quarterly Activity

vs Mar 31, 2026
New
61
Increased
107
Decreased
99
Sold Out
47
Unchanged
34
Holder count: +14
Institutional value: +33.9%
Shares held: +4.9%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 307
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1649904 CUSIP 76243J105 13F (30d) 278 filings 275 filers Visit website Investor relations