How many insider trades does FilingIQ track for CTKB?

FilingIQ tracks 581 Form 4 insider transactions for CTKB (Cytek Biosciences, Inc.), covering filings from Jul 22, 2021 onwards. 66 of those were filed in the last 90 days.

Are CTKB insiders net buyers or net sellers?

Across the full Form 4 history for CTKB, 27 transactions (5%) were open-market purchases and 75 (13%) were open-market sales. Compensatory awards and option exercises are filtered out of these counts.

Where does CTKB insider data come from?

Every transaction shown on this page is sourced directly from SEC EDGAR Form 4 filings. FilingIQ parses the raw XML, normalises insider identity across reporting variations, and scores each trade on its multi-factor composite model.

What sector is CTKB in?

Cytek Biosciences, Inc. (CTKB) is classified in the Healthcare sector, specifically Medical Devices, with a current market capitalisation of $515.49M.

CTKB insider trading

NasdaqGS Healthcare

Cytek Biosciences, Inc. — scored insider trade history from SEC Form 4 filings, parsed and contextualised by FilingIQ.

Total Form 4 trades

581

Last 90 days

Buys / sells

5% / 13%

Market cap

$515.49M

About Cytek Biosciences, Inc.

Cytek Biosciences, Inc., a cell analysis solutions company, provides cell analysis tools that facilitate scientific advances in biomedical research and clinical applications. The company offers Cytek aurora, northern lights systems, and Cytek aurora evo systems delivers cell analysis; Cytek Aurora CS System, a cellular complexity to perform additional downstream genomic and proteomic studies using phenotyping approaches; enhanced small particle detection; Cytek amnis imagestream imaging flow cytometers; Cytek guava muse cell analyzers; Cytek muse micro cell analyzers; Cytek guava easyCyte flow cytometers; and Cytek orion reagent cocktail preparation systems. It also provides reagents and kits, including cFluor reagents that are fluorochrome conjugated antibodies used to identify cells of interest for analysis on its instruments. In addition, the company offers automated micro-sampling system and automated sample loader system, an automated loaders designed to integrate seamlessly into the Cytek aurora and northern lights systems; SpectroFlo software that provides intuitive workflow from quality control to data analysis for Cytek aurora, northern lights, and Cytek aurora evo systems; and customer support tools. Further, it provides conventional flow and image-based flow cytometry instrumentation and related products and services under the Amnis and Guava brand names. The company serves pharmaceutical and biopharma companies, academic research centers, and contract research organizations. It distributes its products through direct sales force and support organizations in North America, Europe, China, and the Asia-Pacific regions; and through distributors or sales agents in Europe, Latin America, and the Middle East countries. The company was formerly known as Cytoville, Inc. and changed its name to Cytek Biosciences, Inc. in August 2015. Cytek Biosciences, Inc. was founded in 1992 and is headquartered in Fremont, California.

Company website: cytekbio.com

CTKB insider activity at a glance

FilingIQ has scored 581 insider transactions for CTKB since Jul 22, 2021. The most recent filing in our index is dated Mar 13, 2026.

Across the full history, 27 open-market purchases and 75 open-market sales were filed under transaction codes P and S respectively. Compensatory share awards (code A) and option exercises (code M) are tracked separately and not counted here.

The average FilingIQ composite score on CTKB insider trades is 60.6/100, produced by FilingIQ's multi-factor Form 4 model. Model framework documented at methodology.

View live CTKB trades on FilingIQ Raw filings on SEC EDGAR

Latest CTKB Form 4 filings

McCombe William D. Chief Financial Officer

P Jun 2, 2025

Most recent disclosures. Sign up to filter by score, transaction code, or insider role.

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Frequently asked

How many insider trades does FilingIQ track for CTKB?: FilingIQ tracks 581 Form 4 insider transactions for CTKB (Cytek Biosciences, Inc.), covering filings from Jul 22, 2021 onwards. 66 of those were filed in the last 90 days.
Are CTKB insiders net buyers or net sellers?: Across the full Form 4 history for CTKB, 27 transactions (5%) were open-market purchases and 75 (13%) were open-market sales. Compensatory awards and option exercises are filtered out of these counts.
Where does CTKB insider data come from?: Every transaction shown on this page is sourced directly from SEC EDGAR Form 4 filings. FilingIQ parses the raw XML, normalises insider identity across reporting variations, and scores each trade on its multi-factor composite model.
What sector is CTKB in?: Cytek Biosciences, Inc. (CTKB) is classified in the Healthcare sector, specifically Medical Devices, with a current market capitalisation of $515.49M.

Methodology & sources

Every CTKB insider transaction shown on FilingIQ is parsed directly from a public SEC Form 4 XML filing. Insider identity is normalised across reporting variants (CIK changes, name spellings, related-party indirect holdings). The FilingIQ composite score is documented in full on the team page and algo disclosure. Not investment advice; see disclaimer.