Avoro Capital Advisors LLC
· New
Change
+3.3M
Date
Q1 2026
CY
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Avoro Capital Advisors LLC
· New
Change
+3.3M
Date
Q1 2026
|
Avoro Capital Advisors LLC | New· Q1 2026 | – | +3.3M | – | Q1 2026 | |||||
|
FMR LLC
· Reduced
Change
−2.1M
Δ Own
−16.3%
Date
Q1 2026
|
FMR LLC | Reduced· Q1 2026 | – | −2.1M | −16.3% | Q1 2026 | |||||
|
Deep Track Capital, LP
· Reduced
Change
−2.0M
Date
Q1 2026
|
Deep Track Capital, LP | Reduced· Q1 2026 | – | −2.0M | – | Q1 2026 | |||||
|
Paradigm Biocapital Advisors LP
· New
Change
+1.5M
Date
Q1 2026
|
Paradigm Biocapital Advisors LP | New· Q1 2026 | – | +1.5M | – | Q1 2026 | |||||
|
William Blair Investment Management, LLC
· New
Change
+1.1M
Date
Q1 2026
|
William Blair Investment Management, LLC | New· Q1 2026 | – | +1.1M | – | Q1 2026 | |||||
|
Balyasny Asset Management L.P.
· New
Change
+993K
Date
Q1 2026
|
Balyasny Asset Management L.P. | New· Q1 2026 | – | +993K | – | Q1 2026 | |||||
|
UBS Group AG
· Added
Change
+946K
Date
Q1 2026
|
UBS Group AG | Added· Q1 2026 | – | +946K | – | Q1 2026 | |||||
|
Norges
· Exited
Change
−807K
Δ Own
−100.0%
Date
Q1 2026
|
Norges | Exited· Q1 2026 | – | −807K | −100.0% | Q1 2026 | |||||
|
Capital Research Global Investors
· New
Change
+771K
Date
Q1 2026
|
Capital Research Global Investors | New· Q1 2026 | – | +771K | – | Q1 2026 | |||||
|
Polar Capital Holdings PLC
· Reduced
Change
−761K
Date
Q1 2026
|
Polar Capital Holdings PLC | Reduced· Q1 2026 | – | −761K | – | Q1 2026 | |||||
|
Woodline Partners LP
· Reduced
Change
−648K
Date
Q1 2026
|
Woodline Partners LP | Reduced· Q1 2026 | – | −648K | – | Q1 2026 | |||||
|
Point72 Asset Management, L.P.
· New
Change
+626K
Date
Q1 2026
|
Point72 Asset Management, L.P. | New· Q1 2026 | – | +626K | – | Q1 2026 | |||||
|
Siren, L.L.C.
· New
Change
+614K
Date
Q1 2026
|
Siren, L.L.C. | New· Q1 2026 | – | +614K | – | Q1 2026 | |||||
|
D. E. Shaw & Co., Inc.
· Added
Change
+587K
Δ Own
+492.7%
Date
Q1 2026
|
D. E. Shaw & Co., Inc. | Added· Q1 2026 | – | +587K | +492.7% | Q1 2026 | |||||
|
Logos Global Management LP
· Added
Change
+575K
Date
Q1 2026
|
Logos Global Management LP | Added· Q1 2026 | – | +575K | – | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Wysenski Nancy
· Director
Grant (A)
$6K
|
Wysenski Nancy | Director | Grant (A) | $82.62 | 75 | $6K | 34K | +0.2% | Jul 15, 2026 | Jul 16, 2026 | |||||||||
|
Wierenga Wendell
· Director
Grant (A)
$6K
|
Wierenga Wendell | Director | Grant (A) | $82.62 | 75 | $6K | 36K | +0.2% | Jul 15, 2026 | Jul 16, 2026 | |||||||||
|
Kaye Edward M. Md
· Director
Grant (A)
$12K
|
Kaye Edward M. Md | Director | Grant (A) | $82.62 | 151 | $12K | 10K | +1.5% | Jul 15, 2026 | Jul 16, 2026 | |||||||||
|
Henderson John T.
· Director
Grant (A)
$22K
|
Henderson John T. | Director | Grant (A) | $82.62 | 272 | $22K | 78K | +0.3% | Jul 15, 2026 | Jul 16, 2026 | |||||||||
|
Harrington Robert Arthur
· Director
Grant (A)
$12K
|
Harrington Robert Arthur | Director | Grant (A) | $82.62 | 151 | $12K | 22K | +0.7% | Jul 15, 2026 | Jul 16, 2026 | |||||||||
|
Daly James M.
· Director
Grant (A)
$12K
|
Daly James M. | Director | Grant (A) | $82.62 | 151 | $12K | 3K | +4.7% | Jul 15, 2026 | Jul 16, 2026 | |||||||||
|
Blum Robert I.
· Director
2 operations
−$615K
|
Blum Robert I. | Director | 2 operations | $82.02 | −8K | −$615K | 378K | – | Jul 13, 2026 | Jul 14, 2026 | |||||||||
|
Blum Robert I.
· Director
2 operations
0
|
Blum Robert I. | Director | 2 operations | $10.60 | 0 | – | 187K | – | Jul 13, 2026 | Jul 14, 2026 | |||||||||
|
Malik Fady Ibraham
· Officer
Sell
−$303K
|
Malik Fady Ibraham | Officer | Sell | $86.62 | −4K | −$303K | 154K | −2.2% | Jul 7, 2026 | Jul 7, 2026 | |||||||||
|
Malik Fady Ibraham
· Officer
2 operations
0
|
Malik Fady Ibraham | Officer | 2 operations | $7.80 | 0 | – | 37K | – | Jul 7, 2026 | Jul 7, 2026 | |||||||||
|
Blum Robert I.
· Director
Sell
−$637K
|
Blum Robert I. | Director | Sell | $84.92 | −8K | −$637K | 378K | −1.9% | Jul 1, 2026 | Jul 2, 2026 | |||||||||
|
Callos Andrew
· Officer
Sell
−$1.3M
|
Callos Andrew | Officer | Sell | $85.80 | −15K | −$1.3M | 59K | −20.4% | Jul 1, 2026 | Jul 2, 2026 | |||||||||
|
Callos Andrew
· Officer
2 operations
0
|
Callos Andrew | Officer | 2 operations | $23.26 | 0 | – | 24K | – | Jul 1, 2026 | Jul 2, 2026 | |||||||||
|
Lee Sung
· Officer
Sell
−$98K
|
Lee Sung | Officer | Sell | $87.79 | −1K | −$98K | 63K | −1.7% | Jul 1, 2026 | Jul 2, 2026 | |||||||||
|
Lee Sung
· Officer
2 operations
0
|
Lee Sung | Officer | 2 operations | $48.51 | 0 | – | 27K | – | Jul 1, 2026 | Jul 2, 2026 | |||||||||
N
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440 reporting institutions disclosed CYTK position changes in the Q1 2026 snapshot.
For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.
An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.
Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.
Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.
A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.