CTKB Cytek Biosciences, Inc.: institutional ownership and insider trading
160 funds reported holding $401M of Cytek Biosciences, Inc. in their latest 13F filings; in Q2 2026 funds net sold $15.5M, with 27 new positions and 38 funds selling out; over the last 12 months insiders bought $0 and sold $0 on the open market.
Famous investors holding CTKB
- Izzy Englander (Millennium Management): $41.4M, 0.0% of the portfolio
- Ken Griffin (Citadel Advisors): $3.20M, 0.0% of the portfolio
- D. E. Shaw (D. E. Shaw & Co.): $2.96M, 0.0% of the portfolio
- Renaissance Technologies (Renaissance Technologies): $2.93M, 0.0% of the portfolio
- Two Sigma (Two Sigma Investments): $745K, 0.0% of the portfolio
Largest institutional holders of CTKB
- BlackRock, Inc. (BLK) — $42.4M
- MILLENNIUM MANAGEMENT LLC — $41.4M
- VANGUARD GROUP INC — $37.8M
- Boston Partners — $33.9M
- HHLR ADVISORS, LTD. — $29.5M
- Topline Capital Management, LLC — $27.8M
- VANGUARD CAPITAL MANAGEMENT LLC — $21.9M
- GEODE CAPITAL MANAGEMENT, LLC — $13.6M
- DIMENSIONAL FUND ADVISORS LP — $11.6M
- STATE STREET CORP (STT, STT-PG) — $11.4M
Recent CTKB insider trades
- Jun 2, 2025: McCombe William D. bought 35,000 shares ($97.3K)
5%+ owners
- BlackRock, Inc.: 7.2% (Schedule 13G/A, filed Jul 8, 2026)
- Millennium Management LLC: 7.2% (Schedule 13G/A, filed Aug 6, 2026)
- Boston Partners: 5.9% (Schedule 13G, filed Aug 4, 2026)