WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
Position in CYTK — Cytokinetics Inc
CIK 1644956
CHICAGO, IL
Position in CYTK
as of Jun 30, 2026
· filed Aug 12, 2026
Position Value
$136,597,223
+$64,914,101 QoQ
Shares Held
1,603,442
+47.4% QoQ
Ownership
1.15%
of shares outstanding
% of Portfolio
0.42%
of 13F equity value
Holder Rank
#17
of 478 holders
Holding Since
Mar 2026
2 quarters on record
Voting authority
Sole 91%
Shared 0%
None 9%
Common Shares in CYTK Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Jun 30, 2026WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds $1,561,504,374 across 14 Biotechnology names. CYTK ranks #7 (8.7% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | ARGX |
Argenx SE
|
264,617 | $245,503,714 | |
| 2 | KRYS |
Krystal Biotech, Inc.
|
570,153 | $211,908,765 | |
| 3 | HALO |
Halozyme Therapeutics, Inc.
|
2,511,050 | $196,539,883 | |
| 4 | MDGL |
Madrigal Pharmaceuticals, Inc.
|
324,123 | $174,037,844 | |
| 5 | MIRM |
Mirum Pharmaceuticals, Inc.
|
1,404,741 | $164,453,028 | |
| 6 | PTCT |
Ptc Therapeutics, Inc.
|
1,722,688 | $140,519,660 | |
| 7 | CYTK |
Cytokinetics Inc
This page
|
1,603,442 | $136,597,223 | |
| 8 | JAZZ |
Jazz Pharmaceuticals plc
|
436,893 | $105,278,106 |
All Filings in CYTK
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2 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $136,597,223 | 1,603,442 | Shares | Sole | 2026-08-12 | |
| 2026-03-31 | $71,683,122 | 1,087,591 | Shares | Sole | 2026-05-08 | |
| No filing history on record for this holder in this stock. | ||||||