Cytokinetics Inc
CYTK- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001061983
In the last 90 days, Cytokinetics Inc insiders filed 0 open-market purchases and 18 sales; 481 institutions reported holding it in 13F filings for Q2 2026, worth $13.7B in total; no superinvestor holds it.
Holders of 5% or more of CYTK
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Cytokinetics Inc, largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| T. Rowe Price Investment Management, Inc. | 13G/A | 16.00%19.1M shares | +1.30 ppfrom 14.70% | May 7, 20253 filings | Nov 14, 2025 | SEC |
| FMR LLC | 13G/A | 10.90%13.1M shares | +1.50 ppfrom 9.40% | Feb 12, 20252 filings | Aug 7, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
8 Schedule 13D and 13G filings on Cytokinetics Inc, newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Mar 26, 20265:41 PM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | −10.09 ppfrom 10.09%Below 5% | Mar 13, 2026 | SEC |
| Nov 14, 202512:18 PM ET | T. Rowe Price Investment Management, Inc. | 13G/A | 16.00%19.1M shares | +1.30 ppfrom 14.70% | Sep 30, 2025 | SEC |
| Nov 10, 20258:27 AM ET | State Street Corp | 13G | 4.70%5.62M shares | NewBelow 5% | Sep 30, 2025 | SEC |
| Aug 14, 202512:12 PM ET | T. Rowe Price Investment Management, Inc. | 13G/A | 14.70%17.6M shares | +3.40 ppfrom 11.30% | Jun 30, 2025 | SEC |
| Aug 7, 202510:16 AM ET | FMR LLCand 1 other | 13G/A | 10.90%13.1M shares | +1.50 ppfrom 9.40% | Jul 31, 2025 | SEC |
| May 7, 202510:37 AM ET | T. Rowe Price Investment Management, Inc. | 13G | 11.30%13.4M shares | New | Apr 30, 2025 | SEC |
| Feb 12, 20259:28 AM ET | FMR LLCand 1 other | 13G/A | 9.40%11.1M shares | – | Dec 31, 2024 | SEC |
| Jan 8, 202511:29 AM ET | Vanguard Group Inc | 13G/A | 10.09%11.9M shares | – | Dec 31, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Cytokinetics Inc shares.
No Form 144 notices for Cytokinetics Inc are on file.