RYTM · Rhythm Pharmaceuticals, Inc. · Shareholders & Ownership
Every disclosed holder of RYTM in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.
Who Owns RYTM
13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positionsNo chart: the summed disclosures exceed shares outstanding, so they are not parts of one whole.
| Holder group | Shares | % Out |
|---|---|---|
| Institutional (13F) | 77,381,604 | 112.39% |
| Insiders (Forms 3, 4, 5) | 543,251 | 0.79% |
| 13D/G-only blocks | 0 | 0.00% |
| Remaining | 9,072,773 | -13.18% |
| Registered funds (N-PORT, not summed) | 29,903,974 | 43.43% |
Shares outstanding: 68,852,082, the issuer's latest cover-page count restated onto today's split basis.
Remaining is negative: the summed disclosures exceed shares outstanding, as when filings are dated at different times or holders that do not disclose their links count the same shares. It is flagged, not clipped.
13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.
Holders of RYTM
| # | Holder | Shares | As of | Notes |
|---|---|---|---|---|
| 1 |
RA CAPITAL MANAGEMENT, L.P.
13F
CIK 1346824 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
6,666,837 | ||
| 2 |
BlackRock, Inc.
13F
CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
6,156,902 | ||
| 2.1 |
iShares Russell 2000 ETF
Fund
S000004344 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
1,416,703 | ||
| 2.2 |
iShares Russell 2000 Growth ETF
Fund
S000004343 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
509,504 | ||
| 2.3 |
BlackRock Health Sciences Opportunities Portfolio
Fund
S000001877 · Registered fund · May 29, 2026
BlackRock Funds, not summed
|
471,276 | ||
| 2.4 |
iShares Biotechnology ETF
Fund
S000004350 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
470,310 | ||
| 2.5 |
Master Small Cap Index Series
Fund
S000002716 · Registered fund · Jun 30, 2026
Quantitative Master Series LLC, not summed
|
101,758 | ||
| 3 |
BAKER BROS. ADVISORS LP
13F
CIK 1263508 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
5,604,483 | ||
| 4 |
JPMORGAN CHASE & CO
13G
CIK 19617 · Bank · Sep 30, 2026
Rule 13d-1(b), qualified institution, not summed
|
3,563,667 | ||
| 4.1 |
JPMORGAN CHASE & CO
13F
CIK 19617 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,652,746 | ||
| 5 |
PRIMECAP MANAGEMENT CO/CA/
13F
CIK 763212 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,168,853 | ||
| 5.1 |
PRIMECAP Odyssey Aggressive Growth Fund
Fund
S000005541 · Registered fund · Jul 31, 2026
PRIMECAP Odyssey Funds, not summed
|
1,967,269 | ||
| 5.2 |
PRIMECAP Odyssey Growth Fund
Fund
S000005540 · Registered fund · Jul 31, 2026
PRIMECAP Odyssey Funds, not summed
|
1,008,902 | ||
| 6 |
VANGUARD PORTFOLIO MANAGEMENT LLC
13F
CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,136,895 | ||
| 7 |
VANGUARD CAPITAL MANAGEMENT LLC
13F
CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,005,977 | ||
| 8 |
PERCEPTIVE ADVISORS LLC
13F
CIK 1224962 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,586,295 | ||
| 9 |
|
2,573,529 | ||
| 9.1 |
State Street(R) SPDR(R) S&P(R) Biotech ETF
Fund
S000010018 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
|
1,161,672 | ||
| 9.2 |
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
Fund
S000050332 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
|
18,700 | ||
| 9.3 |
State Street Institutional Small-Cap Equity Fund
Fund
S000001631 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL FUNDS, not summed
|
9,879 | ||
| 9.4 |
State Street(R) SPDR(R) Portfolio MSCI Global Stock Market ETF
Fund
S000036082 · Registered fund · Jun 30, 2026
SPDR INDEX SHARES FUNDS, not summed
|
3,468 | ||
| 9.5 |
State Street Total Return V.I.S. Fund
Fund
S000001637 · Registered fund · Jun 30, 2026
STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
|
1,358 | ||
| 10 |
PRICE T ROWE ASSOCIATES INC /MD/
13F
CIK 80255 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,566,171 | ||
| 10.1 |
T. Rowe Price New Horizons Fund, Inc.
Fund
S000002106 · Registered fund · Jun 30, 2026
T. ROWE PRICE NEW HORIZONS FUND, INC., not summed
|
779,815 | ||
| 10.2 |
T. Rowe Price Integrated U.S. Small-Cap Growth Equity Fund
Fund
S000002074 · Registered fund · Jun 30, 2026
T. ROWE PRICE INTEGRATED EQUITY FUNDS, INC., not summed
|
466,073 | ||
| 10.3 |
T. Rowe Price Health Sciences Fund, Inc.
Fund
S000002088 · Registered fund · Jun 30, 2026
T. ROWE PRICE HEALTH SCIENCES FUND, INC., not summed
|
241,658 | ||
| 10.4 |
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc.
Fund
S000002073 · Registered fund · Jun 30, 2026
T. ROWE PRICE DIVERSIFIED MID-CAP GROWTH FUND, INC., not summed
|
47,400 | ||
| 10.5 |
T. Rowe Price Small-Mid Cap ETF
Fund
S000079837 · Registered fund · Jun 30, 2026
T. Rowe Price Exchange-Traded Funds, Inc., not summed
|
46,960 | ||
| 11 |
WESTFIELD CAPITAL MANAGEMENT CO LP
13F
CIK 1177719 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,208,595 | ||
| 12 |
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund
S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
2,176,750 | ||
| 13 |
GOLDMAN SACHS GROUP INC
13F
CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,126,502 | ||
| 13.1 |
Goldman Sachs Small/Mid Cap Growth Fund
Fund
S000009322 · Registered fund · May 31, 2026
Goldman Sachs Trust, not summed
|
73,845 | ||
| 13.2 |
Goldman Sachs Small Cap Equity Insights Fund
Fund
S000009329 · Registered fund · Jul 31, 2026
Goldman Sachs Trust, not summed
|
23,140 | ||
| 13.3 |
Multi-Manager U.S. Small Cap Equity Fund
Fund
S000051363 · Registered fund · Apr 30, 2026
Goldman Sachs Trust II, not summed
|
18,537 | ||
| 13.4 |
Goldman Sachs Small Cap Equity ETF
Fund
S000081978 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust, not summed
|
14,505 | ||
| 13.5 |
Goldman Sachs Small Cap Growth Insights Fund
Fund
S000014930 · Registered fund · Jul 31, 2026
Goldman Sachs Trust, not summed
|
13,780 | ||
| 14 |
FEDERATED HERMES, INC.
13F
CIK 1056288 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,785,716 | ||
| 15 |
SMALLCAP World Fund Inc
Fund
S000009599 · Registered fund · Jun 30, 2026
SMALLCAP World Fund Inc, not summed
|
1,707,348 | ||
| 16 |
Polar Capital Holdings Plc
13F
CIK 1837309 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,663,632 | ||
| 17 |
VANGUARD SMALL-CAP INDEX FUND
Fund
S000002845 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
1,572,293 | ||
| 18 |
GEODE CAPITAL MANAGEMENT, LLC
13F
CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,533,698 | ||
| 19 |
Capital Research Global Investors
13F
CIK 1422848 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,532,303 | ||
| 20 |
CITADEL ADVISORS LLC
13F
CIK 1423053 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,263,652 | ||
| 21 |
Checkpoint Capital L.P.
13F
CIK 1977548 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,186,000 | ||
| 22 |
Siren, L.L.C.
13F
CIK 2005245 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,136,275 | ||
| 23 |
MORGAN STANLEY
13F
CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,112,240 | ||
| 23.1 |
E*TRADE No Fee Total Market Index Fund
Fund
S000090722 · Registered fund · Jul 31, 2026
E Trade Trust, not summed
|
101 | ||
| 24 |
Federated Hermes Kaufmann Fund
Fund
S000009729 · Registered fund · Jul 31, 2026
Federated Hermes Equity Funds, not summed
|
1,026,365 | ||
| 25 |
FMR LLC
13F
CIK 315066 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,025,840 | ||
| 25.1 |
Fidelity Small Cap Index Fund
Fund
S000033638 · Registered fund · Jul 31, 2026
Fidelity Salem Street Trust, not summed
|
603,209 | ||
| 25.2 |
Fidelity Small Cap Growth Fund
Fund
S000007193 · Registered fund · Jul 31, 2026
Fidelity Securities Fund, not summed
|
348,248 | ||
| 25.3 |
Fidelity Extended Market Index Fund
Fund
S000006021 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
|
311,201 | ||
| 25.4 |
Fidelity Small Cap Growth K6 Fund
Fund
S000057285 · Registered fund · Jul 31, 2026
Fidelity Securities Fund, not summed
|
177,412 | ||
| 25.5 |
Fidelity Total Market Index Fund
Fund
S000006026 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
|
114,614 | ||
| 26 |
Pictet Asset Management Holding SA
13F
CIK 1993888 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
957,785 | ||
| 27 |
Jupiter Topco LLC
13F
CIK 2146052 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
925,490 | ||
| 28 |
VANGUARD SMALL-CAP GROWTH INDEX FUND
Fund
S000002846 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
905,995 | ||
| 29 |
ALLIANCEBERNSTEIN L.P.
13F
CIK 1109448 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
894,723 | ||
| 29.1 |
AB Small Cap Growth Portfolio
Fund
S000010309 · Registered fund · Jun 30, 2026
AB CAP FUND, INC., not summed
|
232,221 | ||
| 29.2 |
AB DISCOVERY GROWTH FUND, INC.
Fund
S000010117 · Registered fund · Jun 30, 2026
AB DISCOVERY GROWTH FUND, INC., not summed
|
178,881 | ||
| 29.3 |
Small Cap Core Portfolio
Fund
S000051867 · Registered fund · Jun 30, 2026
Bernstein Fund Inc, not summed
|
45,407 | ||
| 29.4 |
AB Small Cap Growth Portfolio
Fund
S000010435 · Registered fund · Jun 30, 2026
AB VARIABLE PRODUCTS SERIES FUND, INC., not summed
|
4,206 | ||
| 29.5 |
Tax-Aware Overlay A Portfolio
Fund
S000027648 · Registered fund · Jun 30, 2026
BERNSTEIN SANFORD C FUND INC, not summed
|
1,238 | ||
| 30 |
Woodline Partners LP
13F
CIK 1784547 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
758,891 | ||
| 31 |
JPMorgan Mid Cap Growth Fund
Fund
S000003654 · Registered fund · Jun 30, 2026
JPMorgan Trust II, not summed
|
747,736 | ||
| 32 |
VANGUARD EXTENDED MARKET INDEX FUND
Fund
S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
715,692 | ||
| 33 |
Clearbridge Investments, LLC
13F
CIK 1348883 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
696,473 | ||
| 34 |
Rock Springs Capital Management LP
13F
CIK 1595725 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
692,598 | ||
| 35 |
NORGES BANK
13F
CIK 1374170 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
|
685,844 | ||
| 36 |
Federated Hermes Kaufmann Small Cap Fund
Fund
S000009730 · Registered fund · Jul 31, 2026
Federated Hermes Equity Funds, not summed
|
610,000 | ||
| 37 |
FRANKLIN RESOURCES INC
13F
CIK 38777 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
577,033 | ||
| 37.1 |
Putnam Small Cap Growth Fund
Fund
S000000777 · Registered fund · Jun 30, 2026
Putnam Funds Trust, not summed
|
271,279 | ||
| 37.2 |
Putnam Global Health Care Fund
Fund
S000005666 · Registered fund · May 31, 2026
Putnam Global Health Care Fund, not summed
|
76,900 | ||
| 37.3 |
Franklin Small Cap Enhanced ETF
Fund
S000097279 · Registered fund · Jun 30, 2026
Franklin Templeton ETF Trust, not summed
|
11,653 | ||
| 37.4 |
Putnam Dynamic Asset Allocation Growth Fund
Fund
S000000780 · Registered fund · Jun 30, 2026
Putnam Asset Allocation Funds, not summed
|
8,630 | ||
| 37.5 |
Putnam VT Global Health Care Fund
Fund
S000003874 · Registered fund · Jun 30, 2026
Putnam Variable Trust, not summed
|
7,400 | ||
| 38 |
VANGUARD EXPLORER FUND
Fund
S000002578 · Registered fund · Jul 31, 2026
VANGUARD EXPLORER FUND, not summed
|
559,749 | ||
| 39 |
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F
CIK 884546 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
552,738 | ||
| 39.1 |
Schwab U.S. Small-Cap ETF
Fund
S000026636 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
|
292,435 | ||
| 39.2 |
Schwab Small-Cap Index Fund
Fund
S000005912 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
|
134,136 | ||
| 39.3 |
Schwab Total Stock Market Index Fund
Fund
S000005913 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
|
39,305 | ||
| 39.4 |
Schwab U.S. Broad Market ETF
Fund
S000026631 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
|
35,572 | ||
| 39.5 |
Schwab 1000 Index Fund
Fund
S000006807 · Registered fund · Jul 31, 2026
SCHWAB INVESTMENTS, not summed
|
20,702 | ||
| 40 |
Integral Health Asset Management, LLC
13F
CIK 1773206 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
550,000 | ||
| 41 |
Invesco Ltd.
13F
CIK 914208 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
543,271 | ||
| 41.1 |
Invesco Discovery Fund
Fund
S000064618 · Registered fund · May 31, 2026
AIM Counselor Series Trust (Invesco Counselor Series Trust), not summed
|
356,869 | ||
| 41.2 |
Invesco Health Care Fund
Fund
S000000235 · Registered fund · Jul 31, 2026
AIM Investment Funds (Invesco Investment Funds), not summed
|
57,008 | ||
| 41.3 |
Invesco RAFI US 1500 Small-Mid ETF
Fund
S000013120 · Registered fund · Jul 31, 2026
Invesco Exchange-Traded Fund Trust, not summed
|
12,167 | ||
| 41.4 |
Invesco V.I. Health Care Fund
Fund
S000000193 · Registered fund · Jun 30, 2026
AIM Variable Insurance Funds (Invesco Variable Insurance Funds), not summed
|
7,408 | ||
| 41.5 |
Invesco Nasdaq Biotechnology ETF
Fund
S000072469 · Registered fund · May 31, 2026
Invesco Exchange-Traded Fund Trust II, not summed
|
3,661 | ||
| 42 |
NORTHERN TRUST CORP
13F
CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
540,332 | ||
| 42.1 |
Small Cap Index Fund
Fund
S000001245 · Registered fund · Jun 30, 2026
Northern Funds, not summed
|
27,907 | ||
| 42.2 |
Small Cap Core Fund
Fund
S000001244 · Registered fund · Jun 30, 2026
Northern Funds, not summed
|
5,518 | ||
| 42.3 |
FlexShares Morningstar US Market Factor Tilt Index Fund
Fund
S000033312 · Registered fund · Jul 31, 2026
FlexShares Trust, not summed
|
3,058 | ||
| 43 |
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC
13F
CIK 861177 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
514,850 | ||
| 44 |
Harbor Small Cap Growth Fund
Fund
S000000686 · Registered fund · Jul 31, 2026
HARBOR FUNDS, not summed
|
512,020 | ||
| 45 |
WELLINGTON MANAGEMENT GROUP LLP
13F
CIK 902219 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
488,747 | ||
| 46 |
JPMorgan Growth Advantage Fund
Fund
S000004474 · Registered fund · Jun 30, 2026
J.P. Morgan Mutual Fund Investment Trust, not summed
|
456,132 | ||
| 47 |
VANGUARD FIDUCIARY TRUST CO
13F
CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
445,723 | ||
| 48 |
LOOMIS SAYLES & CO L P
13F
CIK 312348 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
434,102 | ||
| 48.1 |
Loomis Sayles Small Cap Growth Fund
Fund
S000006705 · Registered fund · Jun 30, 2026
LOOMIS SAYLES FUNDS II, not summed
|
234,827 | ||
| 49 |
Candriam S.C.A.
13F
CIK 1537014 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
433,025 | ||
| 50 |
Squarepoint Ops LLC
13F
CIK 1642575 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
422,921 |
51 more nested rows are not shown here; Every filing lists them all.
Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.
Showing 1–50 of 464 holders
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