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CTKB — CYTEK BIOSCIENCES INC

Reported value held$242.80M
Funds holding (latest)41
SectorIndustrials
Funds holding (Q2 2026)34
Institutional value$193.73M · 43.84M sh
New / Add / Cut / Exit4 / 15 / 12 / 2
Top-5 / Top-10 concentration70.4% / 85.2%
Institutional holdings change Reducing -7.6% (-3.60M sh)
Institutional value change Down -6.4%

As of Q2 2026, 34 SEC-registered investment managers reported holding CTKB (CYTEK BIOSCIENCES INC) in their latest 13F filings, with a combined reported value of $193.73M across 43.84M shares. That is -7.6% by share count (-3.60M shares) versus the previous quarter, while reported value moved -6.4%. Ownership is concentrated: the five largest holders account for 70.4% of reported value and the top ten for 85.2%.

Compared with the prior quarter, 4 opened new positions, 15 added to existing stakes, 12 trimmed, 2 exited entirely. 13F holdings are quarter-end snapshots, so these moves reflect positioning as of Q2 2026, not real-time trading.

CTKB is classified in the Industrials sector.

All figures on this page are computed from SEC Form 13F quarterly filings. 13F filers disclose long positions of $100,000 or more within 45 days of quarter end; short positions, options overlays and intra-quarter trades are not included, so treat the numbers as a quarterly snapshot of institutional ownership rather than real-time positioning.

FundQuarterSharesValuePortfolio WeightChange
BlackRock Inc history Q2 2026 9.58M $42.43M 0.00% Reduce
Millennium Management history Q2 2026 9.34M $41.37M 0.02% Add
Vanguard Group history Q4 2025 7.48M $37.75M 0.00% Add
Hillhouse Capital (HHLR Advisors) history Q2 2026 6.66M $29.49M 3.54% Hold
Geode Capital Management history Q2 2026 3.06M $13.56M 0.00% Add
Goldman Sachs Group history Q2 2026 2.17M $9.60M 0.00% Reduce
Royce & Associates history Q2 2026 2.08M $9.22M 0.07% Add
Bank of America Corp history Q2 2026 1.32M $5.83M 0.00% Add
Charles Schwab Investment Management history Q2 2026 1.07M $4.75M 0.00% Reduce
Northern Trust Corp history Q2 2026 1.00M $4.44M 0.00% Hold
Arrowstreet Capital history Q2 2026 973.83K $4.31M 0.00% Add
Wellington Management Group history Q4 2025 764.28K $3.86M 0.00% Reduce
AQR Capital Management history Q2 2026 813.97K $3.61M 0.00% Reduce
Citadel Advisors history Q2 2026 721.47K $3.20M 0.00% Add
Fidelity International (FIL) history Q3 2024 573.60K $3.18M 0.00% Hold
Morgan Stanley history Q2 2026 701.79K $3.11M 0.00% Reduce
D. E. Shaw & Co history Q2 2026 669.18K $2.96M 0.00% Add
Renaissance Technologies history Q2 2026 661.30K $2.93M 0.00% Reduce
Principal Global Investors history Q1 2026 534.76K $2.34M 0.00% Reduce
Fidelity Management & Research (FMR) history Q2 2026 504.38K $2.23M 0.00% Add

View all 41 fund holders →

New Positions (Q2 2026)

Fully Exited (vs previous quarter)

Fund Position History — shares by quarter (top 20 funds)

FundQ3 2021Q4 2021Q1 2022Q2 2022Q3 2022Q4 2022Q1 2023Q2 2023Q3 2023Q4 2023Q1 2024Q2 2024Q3 2024Q4 2024Q1 2025Q2 2025Q3 2025Q4 2025Q1 2026Q2 2026
BlackRock Inc — — — — — — — — — — — — 18.49M 18.48M 18.07M 17.04M 16.55M 17.17M 17.01M 9.58M
Millennium Management 178.98K — 117.77K 902.48K 408.46K 134.73K 952.17K 580.00K 427.95K — 26.64K 946.49K 190.61K 803.92K 495.44K 924.77K 3.42M 4.75M 6.29M 9.34M
Hillhouse Capital (HHLR Advisors) 8.76M 8.76M 8.76M 8.76M 8.76M 8.68M 7.70M 6.66M 6.66M 6.66M 6.66M 6.66M 6.66M 6.66M 6.66M 6.66M 6.66M 6.66M 6.66M 6.66M
Geode Capital Management 321.11K 355.14K 921.14K 1.15M 1.73M 1.79M 1.87M 2.06M 2.35M 2.46M 2.51M 2.58M 2.67M 2.64M 2.69M 2.73M 2.78M 2.79M 2.83M 3.06M
Goldman Sachs Group 69.32K 60.06K 649.29K 74.89K 98.48K 362.12K 205.13K 568.39K 538.36K 562.78K 564.01K 1.36M 1.02M 1.34M 1.16M 1.02M 1.74M 1.79M 2.34M 2.17M
Royce & Associates — — — — — — 44.41K 72.28K 87.49K — 11.35K 119.48K 181.39K 470.82K 565.82K 1.39M 1.76M 1.69M 1.64M 2.08M
Bank of America Corp 223 5.72K 243.94K 26.00K 828.47K 552.55K 182.86K 68.17K 86.63K 35.01K 89.37K 201.75K 206.47K 344.96K 332.12K 91.61K 170.16K 856.16K 1.01M 1.32M
Charles Schwab Investment Management 102.99K 105.70K 289.85K 315.26K 654.66K 668.06K 668.67K 699.49K 835.69K 880.04K 900.99K 917.84K 1.03M 1.06M 1.10M 909.59K 1.11M 1.09M 1.10M 1.07M
Northern Trust Corp 143.86K 159.81K 707.46K 828.62K 921.67K 939.95K 967.89K 1.07M 1.14M 1.19M 1.13M 1.09M 1.07M 1.19M 1.15M 1.10M 1.01M 957.59K 1.01M 1.00M
Arrowstreet Capital — — — — — — — — — — — — — — 48.15K 144.25K 361.29K 361.68K 319.91K 973.83K
AQR Capital Management — — — — 31.16K — — 25.98K 39.04K 56.21K 19.91K 60.15K 79.91K 132.14K 653.28K 1.24M 1.02M 743.46K 912.34K 813.97K
Citadel Advisors 15.32K 92.37K 25.35K 264.93K 69.10K 110.14K 415.89K 30.76K 15.80K — — 57.43K 270.97K 202.14K 608.02K 617.09K 82.30K 166.75K 482.89K 721.47K
Morgan Stanley 40.91K 5.08K 117.89K 196.64K 215.04K 189.59K 516.96K 570.30K 614.29K 836.16K 843.52K 894.36K 1.07M 1.09M 745.48K 1.15M 1.46M 1.70M 1.72M 701.79K
D. E. Shaw & Co — 15.84K 734.06K 210.80K 87.51K 189.68K 133.25K — — — — — — — — — 121.02K 263.13K 260.12K 669.18K
Renaissance Technologies — 109.00K 54.30K 162.90K 211.90K 391.80K 353.50K — 296.90K — — 233.90K 211.60K 462.60K 687.60K 1.06M 795.54K 675.00K 676.70K 661.30K
Fidelity Management & Research (FMR) 2.67M 2.67M 518.23K 520.85K 595.07K 535.66K 518.16K 519.37K 519.74K 522.41K 522.39K 636.69K 667.08K 683.19K 717.16K 205.74K 180.79K 234.07K 283.39K 504.38K
Marshall Wace — 7.16K — 54.10K — — — — — — 68.59K — — — — 261.35K 134.29K — — 441.70K
Point72 Asset Management — — 631.00K 1.54M 673.49K 812.66K — — — — — — — 389.36K 17.50K — 187.62K 114.26K — 422.36K
BNY Mellon 38.57K 52.86K 266.33K 327.99K 394.03K 397.04K 390.54K 760.03K 825.58K 818.27K 774.68K 804.26K 719.04K 730.71K 692.40K 699.91K 673.57K 637.93K 608.65K 371.43K
Invesco Ltd — — 40.10K 52.66K 53.08K 48.31K 122.30K 372.55K 391.69K 325.61K 351.84K 320.47K 332.90K 327.06K 336.95K 343.66K 389.13K 398.80K 388.23K 185.67K

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