Security record
CTKB
Cytek Biosciences, Inc. · Healthcare · Medical - Devices
74Tracked holders
0Δ holders
60.52MShares held
$268.04MReported value
+6New positions
−6Exits
Momentum inputs (comparable managers): holder breadth 0.0% · share flow -0.5% · net new positions 0.0% — formula
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2026
Ownership over time
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 74 | 0 | 60.52M | $268.04M | +6 | −6 |
| Q1 2026 | 76 | +1 | 60.92M | $266.22M | +4 | −3 |
| Q4 2025 | 75 | -1 | 61.04M | $308.28M | — | −1 |
| Q3 2025 | 19 | +4 | 43.35M | $150.42M | +4 | — |
| Q2 2025 | 12 | 0 | 36.22M | $123.14M | +1 | −1 |
| Q1 2025 | 9 | 0 | 9.63M | $38.61M | +1 | −1 |
| Q4 2024 | 9 | +1 | 10.70M | $69.47M | +1 | — |
| Q3 2024 | 7 | 0 | 5.47M | $30.29M | — | — |
| Q2 2024 | 7 | — | 6.05M | $33.76M | — | — |
Who holds it · Q2 2026
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | BlackRock ✦ (passive) | 9.58M | -43.7% | $42.43M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 2 | BlackRock ✦ (passive) | 9.58M | -43.7% | $42.43M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 3 | BlackRock ✦ (passive) | 9.58M | -43.7% | $42.43M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 4 | BlackRock ✦ (passive) | 9.58M | -43.7% | $42.43M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 5 | BlackRock ✦ (passive) | 9.58M | -43.7% | $42.43M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 9.58M | -43.7% | $42.43M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 9.58M | -43.7% | $42.43M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 9.58M | -43.7% | $42.43M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 9 | Millennium Management ✦ | 9.34M | +48.4% | $41.37M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 10 | Boston Partners | 7.66M | +32.0% | $33.94M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 11 | Boston Partners | 7.66M | +32.0% | $33.94M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 12 | Vanguard Capital Management Llc | 4.94M | +3.7% | $21.88M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 13 | Geode Capital Management ✦ (passive) | 3.06M | +8.0% | $13.56M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 14 | Geode Capital Management ✦ (passive) | 3.06M | +8.0% | $13.56M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 15 | Dimensional Fund Advisors Lp | 2.62M | -1.8% | $11.59M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 16 | Dimensional Fund Advisors Lp | 2.62M | -1.8% | $11.59M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 17 | Dimensional Fund Advisors Lp | 2.62M | -1.8% | $11.59M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 18 | Dimensional Fund Advisors Lp | 2.62M | -1.8% | $11.59M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 19 | State Street Global Advisors ✦ (passive) | 2.57M | -37.8% | $11.37M | 0.0% | ▼ Trim | 7 | SEC ↗ |
| 20 | Goldman Sachs Group ✦ | 2.17M | -7.6% | $9.60M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 21 | Goldman Sachs Group ✦ | 2.17M | -7.6% | $9.60M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 22 | Goldman Sachs Group ✦ | 2.17M | -7.6% | $9.60M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 23 | Goldman Sachs Group ✦ | 2.17M | -7.6% | $9.60M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 24 | Russell Investments Group, Ltd. | 1.51M | +11.1% | $6.70M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 25 | Russell Investments Group, Ltd. | 1.51M | +11.1% | $6.70M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 26 | Russell Investments Group, Ltd. | 1.51M | +11.1% | $6.70M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 27 | Russell Investments Group, Ltd. | 1.51M | +11.1% | $6.70M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 28 | Russell Investments Group, Ltd. | 1.51M | +11.1% | $6.70M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 29 | Russell Investments Group, Ltd. | 1.51M | +11.1% | $6.70M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 30 | Russell Investments Group, Ltd. | 1.51M | +11.1% | $6.70M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 31 | Russell Investments Group, Ltd. | 1.51M | +11.1% | $6.70M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 32 | Russell Investments Group, Ltd. | 1.51M | +11.1% | $6.70M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 33 | Russell Investments Group, Ltd. | 1.51M | +11.1% | $6.70M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 34 | Russell Investments Group, Ltd. | 1.51M | +11.1% | $6.70M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 35 | Russell Investments Group, Ltd. | 1.51M | +11.1% | $6.70M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 36 | Russell Investments Group, Ltd. | 1.51M | +11.1% | $6.70M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 37 | Bank Of America Corp /De/ | 1.32M | +30.4% | $5.83M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 38 | Bank Of America Corp /De/ | 1.32M | +30.4% | $5.83M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 39 | Bank Of America Corp /De/ | 1.32M | +30.4% | $5.83M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 40 | Bank Of America Corp /De/ | 1.32M | +30.4% | $5.83M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 41 | Charles Schwab Investment… | 1.07M | -2.8% | $4.75M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 42 | Northern Trust Corp | 1.00M | -0.2% | $4.44M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 43 | Northern Trust Corp | 1.00M | -0.2% | $4.44M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 44 | Northern Trust Corp | 1.00M | -0.2% | $4.44M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 45 | Northern Trust Corp | 1.00M | -0.2% | $4.44M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 46 | Hrt Financial Lp | 997.77K | +141.0% | $4.42M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 47 | Arrowstreet Capital ✦ | 973.83K | +204.4% | $4.31M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 48 | Jane Street Group, Llc | 906.16K | New | $4.01M | 0.0% | New | 1 | SEC ↗ |
| 49 | Jane Street Group, Llc | 906.16K | New | $4.01M | 0.0% | New | 1 | SEC ↗ |
| 50 | Tudor Investment Corp Et Al | 837.91K | +161.3% | $3.71M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 51 | AQR Capital Management ✦ | 813.97K | -10.8% | $3.61M | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 52 | AQR Capital Management ✦ | 813.97K | -10.8% | $3.61M | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 53 | AQR Capital Management ✦ | 813.97K | -10.8% | $3.61M | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 54 | AQR Capital Management ✦ | 813.97K | -10.8% | $3.61M | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 55 | AQR Capital Management ✦ | 813.97K | -10.8% | $3.61M | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 56 | AQR Capital Management ✦ | 813.97K | -10.8% | $3.61M | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 57 | Citadel Advisors ✦ | 721.47K | +53.0% | $3.20M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 58 | Morgan Stanley ✦ | 701.79K | -59.2% | $3.11M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 59 | Morgan Stanley ✦ | 701.79K | -59.2% | $3.11M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 60 | Morgan Stanley ✦ | 701.79K | -59.2% | $3.11M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 61 | Morgan Stanley ✦ | 701.79K | -59.2% | $3.11M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 62 | Morgan Stanley ✦ | 701.79K | -59.2% | $3.11M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 63 | Morgan Stanley ✦ | 701.79K | -59.2% | $3.11M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 64 | Morgan Stanley ✦ | 701.79K | -59.2% | $3.11M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 65 | Qube Research & Technologies Ltd | 689.82K | New | $3.06M | 0.0% | New | 1 | SEC ↗ |
| 66 | Susquehanna International Group, Llp | 681.71K | +1117.1% | $3.02M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 67 | D. E. Shaw & Co. ✦ | 669.18K | +157.2% | $2.96M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 68 | D. E. Shaw & Co. ✦ | 669.18K | +157.2% | $2.96M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 69 | Renaissance Technologies ✦ | 661.30K | -2.3% | $2.93M | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 70 | Fidelity (FMR) ✦ | 504.38K | +78.0% | $2.23M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 71 | Fidelity (FMR) ✦ | 504.38K | +78.0% | $2.23M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 72 | Marshall Wace ✦ | 441.70K | New | $1.96M | 0.0% | New | 1 | SEC ↗ |
| 73 | Marshall Wace ✦ | 441.70K | New | $1.96M | 0.0% | New | 1 | SEC ↗ |
| 74 | Point72 Asset Management ✦ | 422.36K | New | $1.87M | 0.0% | New | 1 | SEC ↗ |
| 75 | Bank of New York Mellon Corp | 371.43K | -39.0% | $1.65M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 76 | Bank of New York Mellon Corp | 371.43K | -39.0% | $1.65M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 77 | Bank of New York Mellon Corp | 371.43K | -39.0% | $1.65M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 78 | Bank of New York Mellon Corp | 371.43K | -39.0% | $1.65M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 79 | Bank of New York Mellon Corp | 371.43K | -39.0% | $1.65M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 80 | American Century Companies Inc | 292.10K | +3.7% | $1.29M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 81 | Nuveen, LLC | 289.42K | +17.9% | $1.28M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 82 | Nuveen, LLC | 289.42K | +17.9% | $1.28M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 83 | Nuveen, LLC | 289.42K | +17.9% | $1.28M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 84 | Connor, Clark & Lunn Investment… | 266.94K | +10.5% | $1.18M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 85 | Connor, Clark & Lunn Investment… | 266.94K | +10.5% | $1.18M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 86 | Bnp Paribas Financial Markets | 215.01K | +175.5% | $952,494 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 87 | Invesco Ltd. | 185.67K | -52.2% | $822,522 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 88 | Invesco Ltd. | 185.67K | -52.2% | $822,522 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 89 | Invesco Ltd. | 185.67K | -52.2% | $822,522 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 90 | Two Sigma Investments ✦ | 168.22K | +557.1% | $745,206 | 0.0% | ▲ Add | 4 | SEC ↗ |
| 91 | Franklin Resources Inc | 156.06K | +36.9% | $691,350 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 92 | Franklin Resources Inc | 156.06K | +36.9% | $691,350 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 93 | Franklin Resources Inc | 156.06K | +36.9% | $691,350 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 94 | Rhumbline Advisers | 153.22K | -39.8% | $678,777 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 95 | Alliancebernstein L.P. | 141.05K | 0.0% | $616,380 | 0.0% | Held | 3 | SEC ↗ |
| 96 | JPMorgan Chase ✦ | 141.86K | -52.6% | $615,690 | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 97 | JPMorgan Chase ✦ | 141.86K | -52.6% | $615,690 | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 98 | JPMorgan Chase ✦ | 141.86K | -52.6% | $615,690 | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 99 | JPMorgan Chase ✦ | 141.86K | -52.6% | $615,690 | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 100 | JPMorgan Chase ✦ | 141.86K | -52.6% | $615,690 | 0.0% | ▼ Trim | 4 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Jane Street Group, Llc | $4.01M | 0.0% |
| Jane Street Group, Llc | $4.01M | 0.0% |
| Qube Research & Technologies… | $3.06M | 0.0% |
| Marshall Wace | $1.96M | 0.0% |
| Marshall Wace | $1.96M | 0.0% |
| Point72 Asset Management | $1.87M | 0.0% |
Exited
| Principal Financial Group Inc | $2.34M | was 0.0% |
| State Of Wisconsin Investment… | $454,681 | was 0.0% |
| Mariner, LLC | $77,824 | was 0.0% |
| Neuberger Berman Group LLC | $49,071 | was 0.0% |
| Simplex Trading, Llc | $14,097 | was 0.0% |
| Optiver Holding B.V. | $13,875 | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 164 holders, 84.77M shares, $364.62M reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
Frequently co-owned
What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.
Aug 06
SC 13G/A — MILLENNIUM MANAGEMENT LLC
Aug 04
SC 13G — Boston Partners
Jul 08
SC 13G/A — BlackRock, Inc.
Provenance: Ownership from parsed 13F common-stock positions (tracked universe, comparable sets for changes); insider rows from Forms 3/4/5; stakes from Schedules 13D/13G; every filing links to its original on SEC EDGAR.
Reporting period: Q2 2026 ·
Methodology ·
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