GW&K Investment Management, LLC
Position in RARE — Ultragenyx Pharmaceutical Inc.
CIK 1082917
BOSTON, MA
Position in RARE
as of Mar 31, 2026
· filed May 13, 2026
Position Value
$33,843,174
+$2,208,813 QoQ
Shares Held
1,615,426
+17.5% QoQ
Ownership
1.64%
of shares outstanding
% of Portfolio
0.31%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2023
13 quarters on record
Voting authority
Sole 96.38751859415498.ToString("F0")%
Shared 3.5872249256698074.ToString("F0")%
None 0.025256480175210642.ToString("F0")%
Common Shares in RARE Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Mar 31, 2026GW&K Investment Management, LLC holds $699,704,251 across 25 Biotechnology names. RARE ranks #9 (4.8% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | INSM |
INSMED Inc
|
623,048 | $101,880,808 | |
| 2 | HALO |
Halozyme Therapeutics, Inc.
|
1,393,875 | $90,086,140 | |
| 3 | BBIO |
BridgeBio Pharma, Inc.
|
962,643 | $71,485,868 | |
| 4 | JAZZ |
Jazz Pharmaceuticals plc
|
371,098 | $70,156,076 | |
| 5 | CRNX |
Crinetics Pharmaceuticals, Inc.
|
1,618,686 | $58,790,674 | |
| 6 | IONS |
Ionis Pharmaceuticals Inc
|
779,349 | $58,521,315 | |
| 7 | VCEL |
Vericel Corp
|
1,616,855 | $52,014,225 | |
| 8 | AGIO |
Agios Pharmaceuticals, Inc.
|
1,214,901 | $41,100,100 |
All Filings in RARE
Export CSV
13 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $33,843,174 | 1,615,426 | Shares | Sole | 2026-05-13 | |
| 2025-12-31 | $31,634,361 | 1,375,407 | Shares | Sole | 2026-02-11 | |
| 2025-09-30 | $34,597,082 | 1,150,169 | Shares | Sole | 2025-11-12 | |
| 2025-06-30 | $17,499,631 | 481,288 | Shares | Sole | 2025-08-11 | |
| 2025-03-31 | $18,185,060 | 502,211 | Shares | Sole | 2025-05-05 | |
| 2024-12-31 | $21,436,558 | 509,545 | Shares | Sole | 2025-02-05 | |
| 2024-09-30 | $25,917,907 | 466,569 | Shares | Sole | 2024-11-07 | |
| 2024-06-30 | $16,707,930 | 406,519 | Shares | Sole | 2024-08-12 | |
| 2024-03-31 | $14,164,672 | 303,377 | Shares | Sole | 2024-05-08 | |
| 2023-12-31 | $14,706,036 | 307,529 | Shares | Sole | 2024-02-09 | |
| 2023-09-30 | $11,084,119 | 310,915 | Shares | Sole | 2023-11-09 | |
| 2023-06-30 | $13,214,907 | 286,471 | Shares | Sole | 2023-08-09 | |
| 2023-03-31 | $2,538,891 | 63,314 | Shares | Sole | 2023-05-09 | |
| No filing history on record for this holder in this stock. | ||||||