WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
Position in HALO — Halozyme Therapeutics, Inc.
CIK 1644956
CHICAGO, IL
Position in HALO
as of Mar 31, 2026
· filed May 8, 2026
Position Value
$163,253,764
+$39,222,826 QoQ
Shares Held
2,525,975
+37.1% QoQ
Ownership
2.13%
of shares outstanding
% of Portfolio
0.54%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2020
14 quarters on record
Voting authority
Sole 91.64164332584448.ToString("F0")%
Shared 0.ToString("F0")%
None 8.358356674155525.ToString("F0")%
Common Shares in HALO Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Mar 31, 2026WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds $1,135,241,101 across 13 Biotechnology names. HALO ranks #3 (14.4% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | ARGX |
Argenx SE
|
266,067 | $194,295,426 | |
| 2 | MDGL |
Madrigal Pharmaceuticals, Inc.
|
340,519 | $178,251,480 | |
| 3 | HALO |
Halozyme Therapeutics, Inc.
This page
|
2,525,975 | $163,253,764 | |
| 4 | INSM |
INSMED Inc
|
902,666 | $147,603,944 | |
| 5 | TECH |
BIO-TECHNE Corp
|
2,462,487 | $128,689,570 | |
| 6 | KRYS |
Krystal Biotech, Inc.
|
407,178 | $105,182,220 | |
| 7 | CYTK |
Cytokinetics Inc
|
1,087,591 | $71,683,122 | |
| 8 | VCEL |
Vericel Corp
|
1,832,709 | $58,958,248 |
All Filings in HALO
Export CSV
14 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $163,253,764 | 2,525,975 | Shares | Sole | 2026-05-08 | |
| 2025-12-31 | $124,030,938 | 1,842,956 | Shares | Sole | 2026-02-09 | |
| 2022-12-31 | $210,871,570 | 3,706,003 | Shares | Sole | 2023-02-09 | |
| 2022-09-30 | $175,402,761 | 4,436,084 | Shares | Sole | 2022-11-09 | |
| 2022-06-30 | $200,942,324 | 4,566,871 | Shares | Sole | 2022-08-10 | |
| 2022-03-31 | $212,954,853 | 5,339,891 | Shares | Sole | 2022-05-11 | |
| 2021-12-31 | $204,012,069 | 5,073,665 | Shares | Sole | 2022-02-14 | |
| 2021-09-30 | $203,266,081 | 4,996,708 | Shares | Sole | 2021-11-10 | |
| 2021-06-30 | $221,713,689 | 4,882,486 | Shares | Sole | 2021-08-12 | |
| 2021-03-31 | $222,518,790 | 5,337,462 | Shares | Sole | 2021-05-13 | |
| 2020-12-31 | $271,735,712 | 6,362,344 | Shares | Sole | 2021-02-09 | |
| 2020-09-30 | $171,359,423 | 6,520,526 | Shares | Sole | 2020-11-06 | |
| 2020-06-30 | $176,372,587 | 6,578,612 | Shares | Sole | 2020-08-12 | |
| 2020-03-31 | $118,079,271 | 6,563,606 | Shares | Sole | 2020-05-08 | |
| No filing history on record for this holder in this stock. | ||||||