# RHYTHM PHARMACEUTICALS INC COM

RHYTHM PHARMACEUTICALS INC COM is a security (CUSIP 76243J105) tracked across SEC portfolio filings. 296 institutional managers reported $6.4B on Form 13F as of 2026-06-30; 37 registered fund positions totaling $466.5M via N-PORT as of 2026-05-31.

## Summary

- Issuer: RHYTHM PHARMACEUTICALS INC
- Class: COM
- CUSIP: 76243J105
- Asset category: EC
- 13F holders: 296
- 13F value: $6.4B
- 13F period: 2026-06-30
- N-PORT fund positions: 37
- N-PORT value: $466.5M
- N-PORT report: 2026-05-31

## Top institutional holders (Form 13F)

_Showing 15 of 296 managers by value._

| Manager | Location | Value | Shares |
| --- | --- | --- | --- |
| [VANGUARD GROUP INC](https://search.stillhousedata.com/firm/105958) | Valley Forge, PA | $664.8M | 6,210,916 |
| RA CAPITAL MANAGEMENT, L.P. | Boston, MA | $579.8M | 6,666,837 |
| BlackRock, Inc. | New York, NY | $542.4M | 6,237,151 |
| [BAKER BROS. ADVISORS LP](https://search.stillhousedata.com/firm/158149) | NEW YORK, NY | $487.4M | 5,604,483 |
| [PRIMECAP MANAGEMENT CO/CA/](https://search.stillhousedata.com/firm/105516) | PASADENA, CA | $297.2M | 3,417,509 |
| [PERCEPTIVE ADVISORS LLC](https://search.stillhousedata.com/firm/154703) | NEW YORK, NY | $206.4M | 2,373,795 |
| STATE STREET CORP | BOSTON, MA | $197.6M | 2,271,851 |
| GOLDMAN SACHS GROUP INC | NEW YORK, NY | $170.9M | 1,965,432 |
| [WESTFIELD CAPITAL MANAGEMENT CO LP](https://search.stillhousedata.com/firm/146990) | BOSTON, MA | $167.8M | 1,929,123 |
| FMR LLC | BOSTON, MA | $147.0M | 1,689,671 |
| [Polar Capital Holdings Plc](https://search.stillhousedata.com/firm/136133) | London, X0 | $140.5M | 1,615,586 |
| [CITADEL ADVISORS LLC](https://search.stillhousedata.com/firm/148826) | MIAMI, FL | $126.4M | 1,418,619 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://search.stillhousedata.com/firm/115504) | BOSTON, MA | $123.2M | 1,416,269 |
| JPMORGAN CHASE & CO | NEW YORK, NY | $120.0M | 1,553,644 |
| FEDERATED HERMES, INC. | Pittsburgh, PA | $111.9M | 1,286,303 |

## Top fund holders (N-PORT)

_Showing 15 of 37 fund positions by value._

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| [SMALLCAP World Fund Inc](https://search.stillhousedata.com/fund/S000009599) | SMALLCAP World Fund Inc | $93.9M | 11.59% |
| [PRIMECAP Odyssey Growth Fund](https://search.stillhousedata.com/fund/S000005540) | PRIMECAP Odyssey Funds | $89.1M | 164.09% |
| [VANGUARD EXTENDED MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002841) | VANGUARD INDEX FUNDS | $59.0M | 7.24% |
| [T. Rowe Price New Horizons Fund, Inc.](https://search.stillhousedata.com/fund/S000002106) | T. ROWE PRICE NEW HORIZONS FUND, INC. | $43.2M | 33.82% |
| [VANGUARD EXPLORER FUND](https://search.stillhousedata.com/fund/S000002578) | VANGUARD EXPLORER FUND | $30.7M | 14.11% |
| [VANGUARD RUSSELL 2000 INDEX FUND](https://search.stillhousedata.com/fund/S000030003) | VANGUARD SCOTTSDALE FUNDS | $24.0M | 13.70% |
| [T. Rowe Price Health Sciences Fund, Inc.](https://search.stillhousedata.com/fund/S000002088) | T. ROWE PRICE HEALTH SCIENCES FUND, INC. | $21.0M | 19.29% |
| [LORD ABBETT DEVELOPING GROWTH FUND INC](https://search.stillhousedata.com/fund/S000006834) | LORD ABBETT DEVELOPING GROWTH FUND, INC. | $16.4M | 73.82% |
| [AB DISCOVERY GROWTH FUND, INC.](https://search.stillhousedata.com/fund/S000010117) | AB DISCOVERY GROWTH FUND, INC. | $16.0M | 59.37% |
| [Columbia Acorn Fund](https://search.stillhousedata.com/fund/S000009184) | COLUMBIA ACORN TRUST | $10.9M | 48.35% |
| BlackRock Health Sciences Term Trust | BlackRock Health Sciences Term Trust | $9.7M | 95.76% |
| [Bridge Builder Tax Managed Small/Mid Cap Fund](https://search.stillhousedata.com/fund/S000076295) | Bridge Builder Trust | $9.1M | 29.89% |
| [Master Small Cap Index Series](https://search.stillhousedata.com/fund/S000002716) | Quantitative Master Series LLC | $7.5M | 15.50% |
| [Putnam Global Health Care Fund](https://search.stillhousedata.com/fund/S000005666) | Putnam Global Health Care Fund | $6.8M | 46.38% |
| abrdn Healthcare Investors | abrdn Healthcare Investors | $4.1M | 35.91% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/76243J105.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.