CYTEK BIOSCIENCES INC (CTKB) Institutional Ownership Changes & 13F Activity
CYTEK BIOSCIENCES INC (CTKB). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings (Q2 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Millennium Management Llc, Jane Street Group, Llc, Topline Capital Management, Llc, Qube Research & Technologies Ltd, and Susquehanna International Group, Llp.
| Institution | Type | Change in shares | Change Position % | Shares | Reported stock balance | Portfolio quarter | Filing date |
|---|---|---|---|---|---|---|---|
| Manufacturers Life Insurance Company, The | Buy | +1,766 | +5.5% | 33,965 | $150.47K | Q2 2026 | Sep 09, 2026 |
| M&T Bank Corp | Sell | -10,308 | -100.0% | 0 | $0.00 | Q2 2026 | Sep 04, 2026 |
| Citadel Advisors Llc | Buy | +250,078 | +53.1% | 721,470 | $3.20M | Q2 2026 | Sep 02, 2026 |
| California State Teachers Retirement System | Sell | -4,715 | -74.1% | 1,647 | $7.30K | Q2 2026 | Aug 24, 2026 |
| Mercer Global Advisors Inc | Sell | -3,397 | -11.7% | 25,718 | $113.93K | Q2 2026 | Aug 19, 2026 |
| Millennium Management Llc | Buy | +3,046,212 | +48.4% | 9,338,010 | $41.37M | Q2 2026 | Aug 14, 2026 |
| Jane Street Group, Llc | Buy | +906,162 | — | 906,162 | $4.01M | Q2 2026 | Aug 14, 2026 |
| Topline Capital Management, Llc | Sell | -781,031 | -11.1% | 6,283,450 | $27.84M | Q2 2026 | Aug 14, 2026 |
| Qube Research & Technologies Ltd | Buy | +689,821 | — | 689,821 | $3.06M | Q2 2026 | Aug 14, 2026 |
| Susquehanna International Group, Llp | Buy | +625,695 | +1117.1% | 681,705 | $3.02M | Q2 2026 | Aug 14, 2026 |
| Hrt Financial Lp | Buy | +583,717 | +141.0% | 997,769 | $4.42M | Q2 2026 | Aug 14, 2026 |
| Tudor Investment Corp Et Al | Buy | +517,198 | +161.3% | 837,913 | $3.71M | Q2 2026 | Aug 14, 2026 |
| Royce & Associates Lp | Buy | +439,211 | +26.7% | 2,081,579 | $9.22M | Q2 2026 | Aug 14, 2026 |
| Point72 Asset Management, L.P. | Buy | +422,361 | — | 422,361 | $1.87M | Q2 2026 | Aug 14, 2026 |
| Jain Global Llc | Buy | +411,465 | — | 411,465 | $1.82M | Q2 2026 | Aug 14, 2026 |
| D. E. Shaw & Co., Inc. | Buy | +409,057 | +157.3% | 669,182 | $2.96M | Q2 2026 | Aug 14, 2026 |
| Bank Of America Corp | Buy | +306,278 | +30.4% | 1,315,332 | $5.83M | Q2 2026 | Aug 14, 2026 |
| Invesco Ltd. | Buy | +185,671 | — | 185,671 | $822.52K | Q2 2026 | Aug 14, 2026 |
| Goldman Sachs Group Inc | Sell | -177,220 | -7.6% | 2,167,515 | $9.60M | Q2 2026 | Aug 14, 2026 |
| Legal & General Group Plc | Sell | -171,050 | -93.5% | 11,810 | $52.32K | Q2 2026 | Aug 14, 2026 |
| Xtx Topco Ltd | Buy | +142,723 | — | 142,723 | $632.26K | Q2 2026 | Aug 14, 2026 |
| Two Sigma Investments, Lp | Buy | +142,618 | +557.1% | 168,218 | $745.21K | Q2 2026 | Aug 14, 2026 |
| Aqr Capital Management Llc | Sell | -98,371 | -10.8% | 813,971 | $3.61M | Q2 2026 | Aug 14, 2026 |
| Aquatic Capital Management Llc | Buy | +76,762 | — | 76,762 | $340.06K | Q2 2026 | Aug 14, 2026 |
| Squarepoint Ops Llc | Buy | +57,480 | +227.2% | 82,776 | $366.70K | Q2 2026 | Aug 14, 2026 |
| Wells Fargo & Company/Mn | Buy | +57,427 | +126.8% | 102,704 | $454.98K | Q2 2026 | Aug 14, 2026 |
| Balyasny Asset Management L.P. | Buy | +54,381 | — | 54,381 | $240.91K | Q2 2026 | Aug 14, 2026 |
| Numerai Gp Llc | Buy | +47,005 | +41.8% | 159,465 | $706.43K | Q2 2026 | Aug 14, 2026 |
| Exoduspoint Capital Management, Lp | Buy | +36,140 | — | 36,140 | $160.10K | Q2 2026 | Aug 14, 2026 |
| Prelude Capital Management, Llc | Buy | +32,059 | +242.9% | 45,259 | $200.50K | Q2 2026 | Aug 14, 2026 |
Frequently asked questions about CTKB activity
Which institutional owners are buying CTKB?
Institutional owners buying CTKB include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.
What does "buy" mean in CTKB activity?
"Buy" means an investor increased their reported position in CTKB compared to the prior reporting period. This reflects growing exposure to CYTEK BIOSCIENCES INC (CTKB) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).
Is institutional interest in CTKB increasing?
Institutional interest in CTKB can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.
Related CTKB Institutional Insights
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