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RYTM · Rhythm Pharmaceuticals, Inc. · Holdings

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$92.45 -0.38 (-0.41%) At close · Oct 5
Market Cap
$6.79B
Shares
68.85M
Volume · Oct 5 1.03M Avg daily vol (3M) 646.86K

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.

Some SEC filings for this period have not finished importing. Holder totals and changes may be incomplete; these filings remain queued for recovery.
The Sep 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out. Each fund's Change is measured against its own previous reported quarter, shown in the Reported column. Pick a completed quarter in the Quarter selector below to put every fund on one quarter and see the stock-wide activity breakdown.
Holders: 307
Total Value: $8,601,883,442
Total Shares: 77,473,548
Showing 1–100 of 313 holdings by value · page 1 of 4

Institutional Ownership Trend

27 quarters

Holder Concentration

Across 307 13F filers
Top Holder
8.6%
Sep 2023 → Jun 2026 · range 8.6% – 12.1%
of institutional value
Top 5
31.9%
Sep 2023 → Jun 2026 · range 31.9% – 46.8%
of institutional value
Top 10
49.2%
Sep 2023 → Jun 2026 · range 49.2% – 66.4%
of institutional value
HHI
343
Sep 2023 → Jun 2026 · range 343 – 574
Broadly held
Showing 100 of 313
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1649904 CUSIP 76243J105 13F (30d) 8 filings 8 filers Visit website Investor relations