Security record · archived quarter
CTKB
Cytek Biosciences, Inc. · Healthcare · Medical - Devices
75Tracked holders
-1Δ holders
61.04MShares held
$308.28MReported value
+0New positions
−1Exits
Momentum inputs (comparable managers):
holder breadth -1.3% ·
share flow +0.4% ·
net new positions -1.3%
— formula
Concentrated accumulation — rising shares among fewer holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q4 2025
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 · Q4 2025
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | BlackRock ✦ (passive) | 17.17M | +3.8% | $86.72M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 2 | BlackRock ✦ (passive) | 17.17M | +3.8% | $86.72M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 3 | BlackRock ✦ (passive) | 17.17M | +3.8% | $86.72M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 4 | BlackRock ✦ (passive) | 17.17M | +3.8% | $86.72M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 5 | BlackRock ✦ (passive) | 17.17M | +3.8% | $86.72M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 17.17M | +3.8% | $86.72M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 17.17M | +3.8% | $86.72M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 17.17M | +3.8% | $86.72M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 9 | The Vanguard Group ✦ (passive) | 7.48M | +7.8% | $37.75M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 10 | The Vanguard Group ✦ (passive) | 7.48M | +7.8% | $37.75M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 11 | The Vanguard Group ✦ (passive) | 7.48M | +7.8% | $37.75M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 12 | Boston Partners | 5.01M | — | $25.30M | 0.0% | n/c | 1 | SEC ↗ |
| 13 | Millennium Management ✦ | 4.75M | +39.0% | $24.00M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 14 | State Street Global Advisors ✦ (passive) | 4.15M | +1.5% | $20.94M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 15 | Geode Capital Management ✦ (passive) | 2.79M | +0.3% | $14.10M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 16 | Geode Capital Management ✦ (passive) | 2.79M | +0.3% | $14.10M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 17 | Dimensional Fund Advisors Lp | 2.65M | — | $13.37M | 0.0% | n/c | 1 | SEC ↗ |
| 18 | Dimensional Fund Advisors Lp | 2.65M | — | $13.37M | 0.0% | n/c | 1 | SEC ↗ |
| 19 | Dimensional Fund Advisors Lp | 2.65M | — | $13.37M | 0.0% | n/c | 1 | SEC ↗ |
| 20 | Dimensional Fund Advisors Lp | 2.65M | — | $13.37M | 0.0% | n/c | 1 | SEC ↗ |
| 21 | Goldman Sachs Group ✦ | 1.79M | +3.0% | $9.04M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 22 | Goldman Sachs Group ✦ | 1.79M | +3.0% | $9.04M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 23 | Goldman Sachs Group ✦ | 1.79M | +3.0% | $9.04M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 24 | Morgan Stanley ✦ | 1.70M | +16.3% | $8.59M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 25 | Morgan Stanley ✦ | 1.70M | +16.3% | $8.59M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 26 | Morgan Stanley ✦ | 1.70M | +16.3% | $8.59M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 27 | Morgan Stanley ✦ | 1.70M | +16.3% | $8.59M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 28 | Morgan Stanley ✦ | 1.70M | +16.3% | $8.59M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 29 | Morgan Stanley ✦ | 1.70M | +16.3% | $8.59M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 30 | Morgan Stanley ✦ | 1.70M | +16.3% | $8.59M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 31 | Morgan Stanley ✦ | 1.70M | +16.3% | $8.59M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 32 | Charles Schwab Investment… | 1.09M | — | $5.53M | 0.0% | n/c | 1 | SEC ↗ |
| 33 | Russell Investments Group, Ltd. | 1.00M | — | $5.06M | 0.0% | n/c | 1 | SEC ↗ |
| 34 | Russell Investments Group, Ltd. | 1.00M | — | $5.06M | 0.0% | n/c | 1 | SEC ↗ |
| 35 | Russell Investments Group, Ltd. | 1.00M | — | $5.06M | 0.0% | n/c | 1 | SEC ↗ |
| 36 | Russell Investments Group, Ltd. | 1.00M | — | $5.06M | 0.0% | n/c | 1 | SEC ↗ |
| 37 | Russell Investments Group, Ltd. | 1.00M | — | $5.06M | 0.0% | n/c | 1 | SEC ↗ |
| 38 | Russell Investments Group, Ltd. | 1.00M | — | $5.06M | 0.0% | n/c | 1 | SEC ↗ |
| 39 | Russell Investments Group, Ltd. | 1.00M | — | $5.06M | 0.0% | n/c | 1 | SEC ↗ |
| 40 | Russell Investments Group, Ltd. | 1.00M | — | $5.06M | 0.0% | n/c | 1 | SEC ↗ |
| 41 | Russell Investments Group, Ltd. | 1.00M | — | $5.06M | 0.0% | n/c | 1 | SEC ↗ |
| 42 | Russell Investments Group, Ltd. | 1.00M | — | $5.06M | 0.0% | n/c | 1 | SEC ↗ |
| 43 | Russell Investments Group, Ltd. | 1.00M | — | $5.06M | 0.0% | n/c | 1 | SEC ↗ |
| 44 | Russell Investments Group, Ltd. | 1.00M | — | $5.06M | 0.0% | n/c | 1 | SEC ↗ |
| 45 | Russell Investments Group, Ltd. | 1.00M | — | $5.06M | 0.0% | n/c | 1 | SEC ↗ |
| 46 | Northern Trust Corp | 957.59K | — | $4.84M | 0.0% | n/c | 1 | SEC ↗ |
| 47 | Northern Trust Corp | 957.59K | — | $4.84M | 0.0% | n/c | 1 | SEC ↗ |
| 48 | Northern Trust Corp | 957.59K | — | $4.84M | 0.0% | n/c | 1 | SEC ↗ |
| 49 | Northern Trust Corp | 957.59K | — | $4.84M | 0.0% | n/c | 1 | SEC ↗ |
| 50 | Northern Trust Corp | 957.59K | — | $4.84M | 0.0% | n/c | 1 | SEC ↗ |
| 51 | Northern Trust Corp | 957.59K | — | $4.84M | 0.0% | n/c | 1 | SEC ↗ |
| 52 | Bank Of America Corp /De/ | 856.16K | — | $4.32M | 0.0% | n/c | 1 | SEC ↗ |
| 53 | Bank Of America Corp /De/ | 856.16K | — | $4.32M | 0.0% | n/c | 1 | SEC ↗ |
| 54 | Bank Of America Corp /De/ | 856.16K | — | $4.32M | 0.0% | n/c | 1 | SEC ↗ |
| 55 | Bank Of America Corp /De/ | 856.16K | — | $4.32M | 0.0% | n/c | 1 | SEC ↗ |
| 56 | Bank Of America Corp /De/ | 856.16K | — | $4.32M | 0.0% | n/c | 1 | SEC ↗ |
| 57 | Bank Of America Corp /De/ | 856.16K | — | $4.32M | 0.0% | n/c | 1 | SEC ↗ |
| 58 | Wellington Management ✦ | 764.28K | -69.9% | $3.86M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 59 | Wellington Management ✦ | 764.28K | -69.9% | $3.86M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 60 | Wellington Management ✦ | 764.28K | -69.9% | $3.86M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 61 | Wellington Management ✦ | 764.28K | -69.9% | $3.86M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 62 | AQR Capital Management ✦ | 743.46K | -27.1% | $3.75M | 0.0% | ▼ Trim | 7 | SEC ↗ |
| 63 | AQR Capital Management ✦ | 743.46K | -27.1% | $3.75M | 0.0% | ▼ Trim | 7 | SEC ↗ |
| 64 | AQR Capital Management ✦ | 743.46K | -27.1% | $3.75M | 0.0% | ▼ Trim | 7 | SEC ↗ |
| 65 | AQR Capital Management ✦ | 743.46K | -27.1% | $3.75M | 0.0% | ▼ Trim | 7 | SEC ↗ |
| 66 | AQR Capital Management ✦ | 743.46K | -27.1% | $3.75M | 0.0% | ▼ Trim | 7 | SEC ↗ |
| 67 | AQR Capital Management ✦ | 743.46K | -27.1% | $3.75M | 0.0% | ▼ Trim | 7 | SEC ↗ |
| 68 | Renaissance Technologies ✦ | 675.00K | -15.2% | $3.41M | 0.0% | ▼ Trim | 7 | SEC ↗ |
| 69 | Principal Financial Group Inc | 666.93K | — | $3.37M | 0.0% | n/c | 1 | SEC ↗ |
| 70 | Principal Financial Group Inc | 666.93K | — | $3.37M | 0.0% | n/c | 1 | SEC ↗ |
| 71 | Bank of New York Mellon Corp | 637.93K | — | $3.22M | 0.0% | n/c | 1 | SEC ↗ |
| 72 | Bank of New York Mellon Corp | 637.93K | — | $3.22M | 0.0% | n/c | 1 | SEC ↗ |
| 73 | Bank of New York Mellon Corp | 637.93K | — | $3.22M | 0.0% | n/c | 1 | SEC ↗ |
| 74 | Bank of New York Mellon Corp | 637.93K | — | $3.22M | 0.0% | n/c | 1 | SEC ↗ |
| 75 | Bank of New York Mellon Corp | 637.93K | — | $3.22M | 0.0% | n/c | 1 | SEC ↗ |
| 76 | Bank of New York Mellon Corp | 637.93K | — | $3.22M | 0.0% | n/c | 1 | SEC ↗ |
| 77 | UBS Group AG | 460.05K | — | $2.32M | 0.0% | n/c | 1 | SEC ↗ |
| 78 | UBS Group AG | 460.05K | — | $2.32M | 0.0% | n/c | 1 | SEC ↗ |
| 79 | UBS Group AG | 460.05K | — | $2.32M | 0.0% | n/c | 1 | SEC ↗ |
| 80 | Hrt Financial Lp | 437.65K | — | $2.21M | 0.0% | n/c | 1 | SEC ↗ |
| 81 | Invesco Ltd. | 398.80K | — | $2.01M | 0.0% | n/c | 1 | SEC ↗ |
| 82 | Invesco Ltd. | 398.80K | — | $2.01M | 0.0% | n/c | 1 | SEC ↗ |
| 83 | Invesco Ltd. | 398.80K | — | $2.01M | 0.0% | n/c | 1 | SEC ↗ |
| 84 | Arrowstreet Capital ✦ | 361.68K | +0.1% | $1.83M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 85 | JPMorgan Chase ✦ | 328.85K | -54.2% | $1.66M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 86 | JPMorgan Chase ✦ | 328.85K | -54.2% | $1.66M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 87 | JPMorgan Chase ✦ | 328.85K | -54.2% | $1.66M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 88 | Connor, Clark & Lunn Investment… | 295.64K | — | $1.49M | 0.0% | n/c | 1 | SEC ↗ |
| 89 | American Century Companies Inc | 284.64K | — | $1.44M | 0.0% | n/c | 1 | SEC ↗ |
| 90 | D. E. Shaw & Co. ✦ | 263.13K | +117.4% | $1.33M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 91 | Nuveen, LLC | 253.81K | — | $1.28M | 0.0% | n/c | 1 | SEC ↗ |
| 92 | Nuveen, LLC | 253.81K | — | $1.28M | 0.0% | n/c | 1 | SEC ↗ |
| 93 | Rhumbline Advisers | 249.94K | — | $1.26M | 0.0% | n/c | 1 | SEC ↗ |
| 94 | Fidelity (FMR) ✦ | 234.07K | +29.5% | $1.18M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 95 | Ameriprise Financial Inc | 202.32K | — | $1.02M | 0.0% | n/c | 1 | SEC ↗ |
| 96 | Legal & General Group Plc | 188.47K | — | $951,764 | 0.0% | n/c | 1 | SEC ↗ |
| 97 | Legal & General Group Plc | 188.47K | — | $951,764 | 0.0% | n/c | 1 | SEC ↗ |
| 98 | Barclays Plc | 183.24K | — | $925,357 | 0.0% | n/c | 1 | SEC ↗ |
| 99 | Barclays Plc | 183.24K | — | $925,357 | 0.0% | n/c | 1 | SEC ↗ |
| 100 | State Of Wisconsin Investment Board | 168.56K | — | $851,243 | 0.0% | n/c | 1 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| No new tracked buyers this quarter. |
Exited
| Marshall Wace | $465,975 | 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: Q4 2025 ·
Methodology ·
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