Security record · archived quarter
CTKB
Cytek Biosciences, Inc. · Healthcare · Medical - Devices
12Tracked holders
0Δ holders
36.22MShares held
$123.14MReported value
+1New positions
−1Exits
Momentum inputs (comparable managers): holder breadth 0.0% · share flow +4.6% · net new positions 0.0% — formula
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 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 · Q2 2025
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | BlackRock ✦ (passive) | 17.04M | — | $57.92M | 0.0% | n/c | 1 | SEC ↗ ×12 |
| 2 | The Vanguard Group ✦ (passive) | 7.77M | — | $26.40M | 0.0% | n/c | 1 | SEC ↗ ×5 |
| 3 | State Street Global Advisors ✦ (passive) | 4.17M | -4.8% | $14.19M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 4 | Geode Capital Management ✦ (passive) | 2.73M | +1.6% | $9.28M | 0.0% | ▲ Add | 5 | SEC ↗ ×2 |
| 5 | AQR Capital Management ✦ | 1.24M | +89.6% | $4.21M | 0.0% | ▲ Add | 5 | SEC ↗ ×5 |
| 6 | Renaissance Technologies ✦ | 1.06M | +54.6% | $3.61M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 7 | Millennium Management ✦ | 924.77K | +86.7% | $3.14M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 8 | Citadel Advisors ✦ | 617.09K | +2.4% | $2.10M | 0.0% | ▲ Add | 5 | SEC ↗ ×2 |
| 9 | Marshall Wace ✦ | 261.35K | New | $888,596 | 0.0% | New | 1 | SEC ↗ ×2 |
| 10 | Fidelity (FMR) ✦ | 205.74K | — | $699,519 | 0.0% | n/c | 1 | SEC ↗ |
| 11 | Arrowstreet Capital ✦ | 144.25K | +199.6% | $490,457 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 12 | T. Rowe Price ✦ | 56.82K | +6.5% | $194,000 | 0.0% | ▲ Add | 5 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Marshall Wace | $888,596 | 0.0% |
Exited
| Point72 Asset Management | $70,159 | 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 2025 ·
Methodology ·
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