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PRIMECAP MANAGEMENT CO/CA/

Position in RYTM — Rhythm Pharmaceuticals, Inc.

CIK 763212 PASADENA, CA

Position in RYTM

as of Jun 30, 2026 · filed Aug 14, 2026
Position Value
$351,837,748
+$54,616,991 QoQ
Shares Held
3,168,853
-7.3% QoQ
Ownership
4.60%
of shares outstanding
% of Portfolio
0.21%
of 13F equity value
Holder Rank
#4
of 302 holders
Holding Since
Mar 2020
26 quarters on record
Voting authority Sole 100% Shared 0% None 0%

Common Shares in RYTM Over Time

Shares Held

Position Value (USD)

Position in Biotechnology

Healthcare · as of Jun 30, 2026

PRIMECAP MANAGEMENT CO/CA/ holds $3,557,107,452 across 15 Biotechnology names. RYTM ranks #3 (9.9% of the industry book) .

# Ticker Company Shares Value (USD) Open
3 RYTM
Rhythm Pharmaceuticals, Inc.
This page
3,168,853 $351,837,748

All Filings in RYTM

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27 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $351,837,748 3,168,853
2026-03-31 $297,220,757 3,417,509
2025-12-31 $372,356,729 3,478,669
2025-12-31 $372,356,729 3,478,669
2025-09-30 $430,506,130 4,262,859
2025-06-30 $308,243,158 4,878,037
2025-03-31 $306,554,446 5,787,322
2024-12-31 $367,855,216 6,571,190
2024-09-30 $378,093,967 7,216,911
2024-06-30 $300,246,774 7,312,391
2024-03-31 $335,703,118 7,747,591
2023-12-31 $370,180,228 8,052,648
2023-09-30 $189,530,626 8,267,421
2023-06-30 $136,855,737 8,299,317
2023-03-31 $135,714,428 7,607,311
2022-12-31 $201,252,455 6,911,142
2022-09-30 $172,158,854 7,026,892
2022-06-30 $26,410,990 6,364,094
2022-03-31 $72,483,736 6,291,991
2021-12-31 $62,444,770 6,256,991
2021-09-30 $80,725,048 6,181,091
2021-06-30 $120,489,269 6,153,691
2021-03-31 $127,738,963 6,005,593
2020-12-31 $129,102,257 4,342,491
2020-09-30 $77,463,553 3,574,691
2020-06-30 $79,048,839 3,544,791
2020-03-31 $53,918,235 3,542,591