Granahan Investment Management, LLC
Position in RYTM — Rhythm Pharmaceuticals, Inc.
CIK 1026710
WALTHAM, MA
Position in RYTM
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$6,758,351
+$1,036,849 QoQ
Shares Held
77,709
+45.4% QoQ
Ownership
0.113%
of shares outstanding
% of Portfolio
0.33%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Jun 2025
4 quarters on record
Voting authority
Sole 88.73232186747995.ToString("F0")%
Shared 0.ToString("F0")%
None 11.267678132520043.ToString("F0")%
Common Shares in RYTM Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Mar 31, 2026Granahan Investment Management, LLC holds $141,409,593 across 24 Biotechnology names. RYTM ranks #7 (4.8% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | STOK |
Stoke Therapeutics, Inc.
|
335,586 | $10,926,680 | |
| 2 | VKTX |
Viking Therapeutics, Inc.
|
332,192 | $10,809,527 | |
| 3 | CELC |
Celcuity Inc.
|
88,833 | $10,139,398 | |
| 4 | SRRK |
Scholar Rock Holding Corp
|
156,314 | $7,684,396 | |
| 5 | BBIO |
BridgeBio Pharma, Inc.
|
102,911 | $7,642,170 | |
| 6 | SNDX |
Syndax Pharmaceuticals Inc
|
306,321 | $7,155,658 | |
| 7 | RYTM |
Rhythm Pharmaceuticals, Inc.
This page
|
77,709 | $6,758,351 | |
| 8 | IMNM |
Immunome Inc.
|
307,021 | $6,714,549 |
All Filings in RYTM
Export CSV
4 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $6,758,351 | 77,709 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $5,721,502 | 53,452 | Shares | Sole | 2026-02-17 | |
| 2025-09-30 | $5,022,030 | 49,728 | Shares | Sole | 2025-11-14 | |
| 2025-06-30 | $2,601,658 | 41,172 | Shares | Sole | 2025-08-14 | |
| No filing history on record for this holder in this stock. | ||||||