Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in CTKB held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 17.0M | $74.3M | -1.0% | 13.169% | 0.00% |
| 2 | Topline Capital Management, LLC | 7.1M | $30.9M | -5.1% | 5.470% | 5.10% |
| 3 | HHLR ADVISORS, LTD. | 6.7M | $29.1M | 0.0% | 5.155% | 1.74% |
| 4 | MILLENNIUM MANAGEMENT LLC | 6.3M | $27.5M | +32.4% | 4.872% | 0.02% |
| 5 | Boston Partners | 5.8M | $25.4M | +15.9% | 4.493% | 0.03% |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 4.8M | $20.8M | — | 3.688% | 0.00% |
| 7 | STATE STREET CORP | 4.1M | $18.0M | -0.6% | 3.193% | 0.00% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 2.8M | $12.4M | +1.6% | 2.194% | 0.00% |
| 9 | DIMENSIONAL FUND ADVISORS LP | 2.7M | $11.6M | +0.6% | 2.062% | 0.00% |
| 10 | GOLDMAN SACHS GROUP INC | 2.3M | $10.2M | +31.0% | 1.816% | 0.00% |
| 11 | VANGUARD PORTFOLIO MANAGEMENT LLC | 2.3M | $10.1M | — | 1.790% | 0.00% |
| 12 | MORGAN STANLEY | 1.7M | $7.5M | +1.1% | 1.331% | 0.00% |
| 13 | ROYCE & ASSOCIATES LP | 1.6M | $7.2M | -3.0% | 1.272% | 0.07% |
| 14 | BROWN CAPITAL MANAGEMENT LLC | 1.5M | $6.5M | -28.6% | 1.146% | 0.92% |
| 15 | Russell Investments Group, Ltd. | 1.4M | $5.9M | +35.8% | 1.053% | 0.01% |
| 16 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.1M | $4.8M | +0.9% | 0.855% | 0.00% |
| 17 | BANK OF AMERICA CORP /DE/ | 1.0M | $4.4M | +17.9% | 0.781% | 0.00% |
| 18 | NORTHERN TRUST CORP | 1.0M | $4.4M | +5.0% | 0.778% | 0.00% |
| 19 | AQR CAPITAL MANAGEMENT LLC | 912K | $4.0M | +22.7% | 0.707% | 0.00% |
| 20 | Simcoe Capital LLC | 882K | $3.9M | +195.6% | 0.683% | 3.54% |
| 21 | CenterBook Partners LP | 730K | $3.2M | — | 0.565% | 0.17% |
| 22 | VANGUARD FIDUCIARY TRUST CO | 717K | $3.1M | — | 0.555% | 0.00% |
| 23 | RENAISSANCE TECHNOLOGIES LLC | 677K | $3.0M | +0.3% | 0.524% | 0.00% |
| 24 | Bank of New York Mellon Corp | 609K | $2.7M | -4.6% | 0.471% | 0.00% |
| 25 | PRINCIPAL FINANCIAL GROUP INC | 535K | $2.3M | -19.8% | 0.414% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in CTKB — a direct measure of their conviction.
Filings activity in CTKB during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new CTKB position in Q1 2026
Institutions that fully closed their CTKB position in Q1 2026
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 162 | +4.5% | 70.89% | 9.43 pp | $363M | 12% |
| Q4 2025 | 155 | +3.3% | 80.32% | +20.74 pp | $411M | +35% |
| Q3 2025 | 150 | 3.2% | 59.58% | +9.37 pp | $305M | +19% |
| Q2 2025 | 155 | 3.1% | 50.21% | 7.51 pp | $257M | 13% |
| Q1 2025 | 160 | +5.3% | 57.72% | 35.82 pp | $295M | 38% |
| Q4 2024 | 152 | +13% | 93.54% | +16.14 pp | $478M | +21% |
| Q3 2024 | 135 | +6.3% | 77.40% | 1.43 pp | $396M | 1.8% |
| Q2 2024 | 127 | — | 78.83% | — | $403M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying CTKB stock.
Based on Q1 2026 13F filings, institutional ownership of Cytek Biosciences, Inc. stands at 70.9%, held across 162 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of CTKB, with approximately 17,007,269 shares worth $0.07B as of Q1 2026.
Yes — 2 widely-followed marquee investors appear among the top 25 institutional holders of CTKB, including MILLENNIUM MANAGEMENT LLC, RENAISSANCE TECHNOLOGIES LLC.
Our composite Smart Money Score for CTKB is 48 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
24 institutions opened new positions in CTKB during Q1 2026, while 17 fully exited. 43 added to existing positions and 92 trimmed.
CTKB institutional ownership fell by 9.43 percentage points quarter-over-quarter, with a net change of +7 holders.
The top 10 institutions account for 71.8% of all reported 13F value in CTKB, and the top 25 account for 91.9%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Cytek Biosciences, Inc. (CTKB) Institutional Ownership