Cytek Biosciences, Inc.: which funds bought and sold
Institutions that bought and sold Cytek Biosciences shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.
Between March 31, 2026 and June 30, 2026, 72 institutions that filed 13F reports for both quarters added to or opened positions in Cytek Biosciences, and 101 cut or closed them. Together they sold a net 3.5M shares, −4.1% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 10.0M shares (+52.0%); index fund managers were net sellers of 9.9M shares (−28.9%). 28 opened a new position and 37 sold out entirely.
Bought, Q2 2026 72 institutions, 28 of them new holders Sold, Q2 2026 101 institutions, 37 of them sold out
Net change, all compared −3.5M shares (−4.1%)
Net change, active managers +10.0M shares (+52.0%), 28 bought, 8 sold
Buyers versus sellers
72 bought 16 101 sold
Active managers and hedge funds 28 bought · 8 sold · +10.0M
Index fund managers 3 bought · 8 sold · −9.9M
Other institutions 41 bought · 85 sold · −3.6M
Biggest buyers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Millennium Management LLC Hedge fund | +3.0M +48.4% | 9.3M | $41.4M |
| Boston Partners Active manager | +1.9M +32.0% | 7.7M | $33.9M |
| Acadian Asset Management LLC Active manager | +977K +244.9% | 1.4M | $6.1M |
| Jane Street Group, LLC | +906K New position | 906K | $4M |
| Qube Research & Technologies Ltd Hedge fund | +690K New position | 690K | $3.1M |
| Arrowstreet Capital, Limited Partnership Hedge fund | +654K +204.4% | 974K | $4.3M |
| Susquehanna International Group, LLP | +626K +1117.1% | 682K | $3M |
| HRT Financial LP | +584K +141.0% | 998K | $4.4M |
| Tudor Investment Corp Et Al Hedge fund | +517K +161.3% | 838K | $3.7M |
| Marshall Wace, LLP Hedge fund | +442K New position | 442K | $2M |
| Royce & Associates LP Active manager | +439K +26.7% | 2.1M | $9.2M |
| Point72 Asset Management, L.P. Hedge fund | +422K New position | 422K | $1.9M |
| Jain Global LLC Hedge fund | +411K New position | 411K | $1.8M |
| D. E. Shaw & Co., Inc. Hedge fund | +409K +157.3% | 669K | $3M |
| Bank Of America Corp | +306K +30.4% | 1.3M | $5.8M |
| Citadel Advisors LLC Hedge fund | +250K +53.1% | 721K | $3.2M |
| Geode Capital Management, LLC Index funds | +226K +8.0% | 3.1M | $13.6M |
| FMR LLC Active manager | +221K +78.0% | 504K | $2.2M |
| Y-Intercept (Hong Kong) Ltd | +193K New position | 193K | $855,557 |
| Vanguard Capital Management LLC Index funds | +177K +3.7% | 4.9M | $21.9M |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Millennium Management LLC Hedge fund | +3.0M +48.4% | 9.3M | $41.4M |
| Boston Partners Active manager | +1.9M +32.0% | 7.7M | $33.9M |
| Acadian Asset Management LLC Active manager | +977K +244.9% | 1.4M | $6.1M |
| Qube Research & Technologies Ltd Hedge fund | +690K New position | 690K | $3.1M |
| Arrowstreet Capital, Limited Partnership Hedge fund | +654K +204.4% | 974K | $4.3M |
| Tudor Investment Corp Et Al Hedge fund | +517K +161.3% | 838K | $3.7M |
| Marshall Wace, LLP Hedge fund | +442K New position | 442K | $2M |
| Royce & Associates LP Active manager | +439K +26.7% | 2.1M | $9.2M |
| Point72 Asset Management, L.P. Hedge fund | +422K New position | 422K | $1.9M |
| Jain Global LLC Hedge fund | +411K New position | 411K | $1.8M |
Biggest sellers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Blackrock, Inc. Index funds | −7.4M −43.7% | 9.6M | $42.4M |
| State Street Corp Index funds | −1.6M −37.8% | 2.6M | $11.4M |
| Brown Capital Management LLC | −1.5M Sold out | 0 | — |
| Vanguard Portfolio Management LLC Index funds | −1.2M −50.6% | 1.1M | $5.1M |
| Morgan Stanley | −1.0M −59.2% | 702K | $3.1M |
| Simcoe Capital LLC | −882K Sold out | 0 | — |
| Topline Capital Management, LLC | −781K −11.1% | 6.3M | $27.8M |
| Centerbook Partners LP Hedge fund | −581K −79.6% | 149K | $660,867 |
| Principal Financial Group Inc | −535K Sold out | 0 | — |
| Public Sector Pension Investment Board | −395K Sold out | 0 | — |
| Bank Of New York Mellon Corp | −237K −39.0% | 371K | $1.6M |
| Invesco Ltd. | −203K −52.2% | 186K | $822,522 |
| Goldman Sachs Group Inc | −177K −7.6% | 2.2M | $9.6M |
| Ameriprise Financial Inc | −173K −92.5% | 14K | $62,578 |
| Legal & General Group PLC | −171K −93.5% | 12K | $52,318 |
| Jpmorgan Chase & Co | −157K −52.6% | 142K | $615,690 |
| State Of Wisconsin Investment Board | −104K Sold out | 0 | — |
| Rhumbline Advisers Index funds | −101K −39.8% | 153K | $678,777 |
| AQR Capital Management LLC Hedge fund | −98K −10.8% | 814K | $3.6M |
| UBS Group AG | −98K −52.4% | 89K | $393,889 |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Centerbook Partners LP Hedge fund | −581K −79.6% | 149K | $660,867 |
| AQR Capital Management LLC Hedge fund | −98K −10.8% | 814K | $3.6M |
| Panagora Asset Management Inc Active manager | −52K Sold out | 0 | — |
| Algert Global LLC Hedge fund | −28K −65.0% | 15K | $65,985 |
| Jacobs Levy Equity Management, Inc Active manager | −16K −6.1% | 242K | $1.1M |
| Renaissance Technologies LLC Hedge fund | −15K −2.3% | 661K | $2.9M |
| Neuberger Berman Group LLC Active manager | −11K Sold out | 0 | — |
| Victory Capital Management Inc Active manager | −3,966 −22.5% | 14K | $60,492 |
New positions
| Institution | Shares | Value June 30, 2026 |
|---|---|---|
| Jane Street Group, LLC | 906K | $4M |
| Qube Research & Technologies LtdHedge fund | 690K | $3.1M |
| Marshall Wace, LLPHedge fund | 442K | $2M |
| Point72 Asset Management, L.P.Hedge fund | 422K | $1.9M |
| Jain Global LLCHedge fund | 411K | $1.8M |
| Y-Intercept (Hong Kong) Ltd | 193K | $855,557 |
| Xtx Topco Ltd | 143K | $632,263 |
| Aquatic Capital Management LLC | 77K | $340,056 |
| Catalyst Funds Management Pty Ltd | 63K | $276,875 |
| Los Angeles Capital Management LLCActive manager | 62K | $275,369 |
Sold out
| Institution | Shares | Value March 31, 2026 |
|---|---|---|
| Brown Capital Management LLC | 1.5M | $6.5M |
| Simcoe Capital LLC | 882K | $3.9M |
| Principal Financial Group Inc | 535K | $2.3M |
| Public Sector Pension Investment Board | 395K | $1.7M |
| State Of Wisconsin Investment Board | 104K | $454,681 |
| Thrivent Financial For Lutherans | 73K | $321,000 |
| Illinois Municipal Retirement Fund | 61K | $266,032 |
| Panagora Asset Management IncActive manager | 52K | $225,461 |
| Louisiana State Employees Retirement System | 49K | $213,256 |
| New York State Teachers Retirement System | 45K | $196,000 |
Who holds the shares
- Institutions reporting
- 153
- Ten largest holders
- 67.3% of 13F-reported shares
- Index fund managers
- 29.8% of 13F-reported shares
- Active managers and hedge funds
- 36.0% of 13F-reported shares
| Type | Bought | Sold | New | Sold out | Net change in shares | Net % |
|---|---|---|---|---|---|---|
| Active managers and hedge funds | 28 | 8 | 12 | 2 | +10.0M | +52.0% |
| Index fund managers | 3 | 8 | 0 | 1 | −9.9M | −28.9% |
| Other institutions | 41 | 85 | 16 | 34 | −3.6M | −11.5% |