Cytek Biosciences, Inc.

CTKBNASDAQHealthcare● Active

$4.03

$-0.06(-1.38%)

Market Cap$520922453

P/E Ratio—

52W High$6.18

52W Low$2.9

Avg Volume794K

Open$4.12

Beta1.19

Insider Trades Ownership Employees

Cytek Biosciences, Inc. (CTKB) Insider Trading

Form 4 buy vs sell counts, ratio, and sentiment — switch this quarter or last 12 months; chart and transactions below.

SEC EDGAR · FMP · CTKB · as of Jun 8, 2026

Activity summary

Buy transactions

P-Purchase only

Sell transactions

12 Months

Buy/Sell ratio

0.00

Buy/Sell (by trades)

Overall sentiment

NEUTRAL

↑ Buy 0%Active transactions only · RSU vesting excluded100% Sell ↓

Cytek Biosciences, Inc. insiders have shown mixed buying and selling activity over the past 12 Months.

▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · Buy = P-Purchase only · Sell = S-Sale only

As of Jun 8, 2026

CTKB insider buying and selling by quarter

CTKB insider selling · CTKB insider buying stocks · quarterly insider activity

Total insider buying (incl. awards)Total insider selling

2.9M1.4M0

2024 Q3

2024 Q4

2025 Q1

2025 Q2

2025 Q3

2025 Q4

2026 Q1

2026 Q2

Mobile shows last 4Q · Desktop shows full 8Q

▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · last 8 quarters

As of Jun 8, 2026

Active insiders

Most active in past 12 months · CTKB ceo insider trading

Showing all insiders · Click a card to filter the transactions table below

▸ Aggregated from reportingName · top 5 by trade count (12M) · no extra API

Recent insider transactions

CTKB executive sell shares · CTKB board member insider trading · CTKB insider trading SEC filing

Showing 60 most recent · Common Stock · Form 4 only

Scroll horizontally to see all columns

Date	Insider	Type	Shares	Price	Value	After trans.	Filing
May 18, 2026	Holder Michael Director	Option	1,454	—	—	16,721	Form 4
May 18, 2026	Chin Richard Director	Option	6,107	—	—	22,392	Form 4
May 18, 2026	Yan Ming CHIEF TECHNOLOGY OFFICER · Director	Option	9,480	—	—	4,934,944	Form 4
May 18, 2026	Yan Ming CHIEF TECHNOLOGY OFFICER · Director	Other	2,364	$3.55	$8K	4,932,580	Form 4
May 18, 2026	Yan Ming CHIEF TECHNOLOGY OFFICER · Director	Option	4,108	—	—	4,926,489	Form 4
May 18, 2026	Yan Ming CHIEF TECHNOLOGY OFFICER · Director	Other	1,025	$3.55	$4K	4,925,464	Form 4
May 18, 2026	Yan Ming CHIEF TECHNOLOGY OFFICER · Director	Option	3,683	—	—	4,923,300	Form 4
May 18, 2026	Yan Ming CHIEF TECHNOLOGY OFFICER · Director	Other	919	$3.55	$3K	4,922,381	Form 4
May 18, 2026	Yan Ming CHIEF TECHNOLOGY OFFICER · Director	Option	4,908	—	—	4,920,841	Form 4
May 18, 2026	Yan Ming CHIEF TECHNOLOGY OFFICER · Director	Other	1,224	$3.55	$4K	4,919,617	Form 4
May 18, 2026	Busque Philippe SVP, GLOBAL SALES AND SERVICES	Option	5,551	—	—	44,890	Form 4
May 18, 2026	Busque Philippe SVP, GLOBAL SALES AND SERVICES	Other	1,424	$3.55	$5K	43,466	Form 4
May 18, 2026	Busque Philippe SVP, GLOBAL SALES AND SERVICES	Option	2,416	—	—	39,959	Form 4
May 18, 2026	Busque Philippe SVP, GLOBAL SALES AND SERVICES	Other	620	$3.55	$2K	39,339	Form 4
May 18, 2026	Busque Philippe SVP, GLOBAL SALES AND SERVICES	Option	1,473	—	—	37,921	Form 4
May 18, 2026	Busque Philippe SVP, GLOBAL SALES AND SERVICES	Other	378	$3.55	$1K	37,543	Form 4
May 18, 2026	Busque Philippe SVP, GLOBAL SALES AND SERVICES	Option	1,024	—	—	36,711	Form 4
May 18, 2026	Busque Philippe SVP, GLOBAL SALES AND SERVICES	Other	263	$3.55	$934	36,448	Form 4
May 18, 2026	Jiang Wenbin PRESIDENT AND CEO · Director	Option	38,141	—	—	5,492,212	Form 4
May 18, 2026	Jiang Wenbin PRESIDENT AND CEO · Director	Other	15,009	$3.55	$53K	5,477,203	Form 4
May 18, 2026	Jiang Wenbin PRESIDENT AND CEO · Director	Option	19,334	—	—	5,459,103	Form 4
May 18, 2026	Jiang Wenbin PRESIDENT AND CEO · Director	Other	5,032	$3.55	$18K	5,454,071	Form 4
May 18, 2026	Jiang Wenbin PRESIDENT AND CEO · Director	Option	14,733	—	—	5,443,357	Form 4
May 18, 2026	Jiang Wenbin PRESIDENT AND CEO · Director	Other	3,588	$3.55	$13K	5,439,769	Form 4
May 18, 2026	Jiang Wenbin PRESIDENT AND CEO · Director	Option	7,854	—	—	5,430,537	Form 4

Holder Michael

Director

Option

Date

May 18

1,454

Price

—

Value

—

View Form 4 on SEC.gov

Chin Richard

Director

Option

Date

May 18

6,107

Price

—

Value

—

View Form 4 on SEC.gov

Yan Ming

CHIEF TECHNOLOGY OFFICER · Director

Option

Date

May 18

9,480

Price

—

Value

—

View Form 4 on SEC.gov

Yan Ming

CHIEF TECHNOLOGY OFFICER · Director

Other

Date

May 18

2,364

Price

$3.55

Value

$8K

View Form 4 on SEC.gov

Yan Ming

CHIEF TECHNOLOGY OFFICER · Director

Option

Date

May 18

4,108

Price

—

Value

—

View Form 4 on SEC.gov

Yan Ming

CHIEF TECHNOLOGY OFFICER · Director

Other

Date

May 18

1,025

Price

$3.55

Value

$4K

View Form 4 on SEC.gov

Yan Ming

CHIEF TECHNOLOGY OFFICER · Director

Option

Date

May 18

3,683

Price

—

Value

—

View Form 4 on SEC.gov

Yan Ming

CHIEF TECHNOLOGY OFFICER · Director

Other

Date

May 18

919

Price

$3.55

Value

$3K

View Form 4 on SEC.gov

Yan Ming

CHIEF TECHNOLOGY OFFICER · Director

Option

Date

May 18

4,908

Price

—

Value

—

View Form 4 on SEC.gov

Yan Ming

CHIEF TECHNOLOGY OFFICER · Director

Other

Date

May 18

1,224

Price

$3.55

Value

$4K

View Form 4 on SEC.gov

Busque Philippe

SVP, GLOBAL SALES AND SERVICES

Option

Date

May 18

5,551

Price

—

Value

—

View Form 4 on SEC.gov

Busque Philippe

SVP, GLOBAL SALES AND SERVICES

Other

Date

May 18

1,424

Price

$3.55

Value

$5K

View Form 4 on SEC.gov

Busque Philippe

SVP, GLOBAL SALES AND SERVICES

Option

Date

May 18

2,416

Price

—

Value

—

View Form 4 on SEC.gov

Busque Philippe

SVP, GLOBAL SALES AND SERVICES

Other

Date

May 18

620

Price

$3.55

Value

$2K

View Form 4 on SEC.gov

Busque Philippe

SVP, GLOBAL SALES AND SERVICES

Option

Date

May 18

1,473

Price

—

Value

—

View Form 4 on SEC.gov

Busque Philippe

SVP, GLOBAL SALES AND SERVICES

Other

Date

May 18

378

Price

$3.55

Value

$1K

View Form 4 on SEC.gov

Busque Philippe

SVP, GLOBAL SALES AND SERVICES

Option

Date

May 18

1,024

Price

—

Value

—

View Form 4 on SEC.gov

Busque Philippe

SVP, GLOBAL SALES AND SERVICES

Other

Date

May 18

263

Price

$3.55

Value

$934

View Form 4 on SEC.gov

Jiang Wenbin

PRESIDENT AND CEO · Director

Option

Date

May 18

38,141

Price

—

Value

—

View Form 4 on SEC.gov

Jiang Wenbin

PRESIDENT AND CEO · Director

Other

Date

May 18

15,009

Price

$3.55

Value

$53K

View Form 4 on SEC.gov

Jiang Wenbin

PRESIDENT AND CEO · Director

Option

Date

May 18

19,334

Price

—

Value

—

View Form 4 on SEC.gov

Jiang Wenbin

PRESIDENT AND CEO · Director

Other

Date

May 18

5,032

Price

$3.55

Value

$18K

View Form 4 on SEC.gov

Jiang Wenbin

PRESIDENT AND CEO · Director

Option

Date

May 18

14,733

Price

—

Value

—

View Form 4 on SEC.gov

Jiang Wenbin

PRESIDENT AND CEO · Director

Other

Date

May 18

3,588

Price

$3.55

Value

$13K

View Form 4 on SEC.gov

Jiang Wenbin

PRESIDENT AND CEO · Director

Option

Date

May 18

7,854

Price

—

Value

—

View Form 4 on SEC.gov

⚡ = value ≥ $1M · Award/Option price shows — · formType=4 · securityName=Common Stock · url → sec.gov/Archives/edgar

1 / 3

▸ Source: SEC EDGAR · Form 4 filings · ⚡ = value ≥ $1M · Award/Option price shows —

About CTKB insider trading

CTKB insider trades

Cytek Biosciences, Inc. (CTKB) insider trading data is sourced from SEC Form 4 filings submitted by corporate insiders, including Busque Philippe (SVP, GLOBAL SALES AND SERVICES), Jiang Wenbin (PRESIDENT AND CEO · Director), Barnett Valerie (CHIEF LEGAL OFFICER). Over the past 12 months, 5 insiders have filed transactions with the SEC. CTKB insiders have been mixed buying and selling, which may reflect pre-scheduled Rule 10b5-1 plan executions.

For Cytek Biosciences, Inc.'s institutional ownership breakdown and insider ownership percentage, see the Ownership tab → Ownership tab →

Buy/Sell signal logic

acquisitionOrDisposition field:

A = Acquisition (buy) · D = Disposition (sell)

RSU vesting (M-Exempt) excluded from sentiment

Form 4SEC filing required within 2 business days of any insider transaction

10b5-1Pre-scheduled trading plan that allows insiders to sell on autopilot

Open MktDirect purchase or sale on the open market (excludes awards, options)

Ownership SEC filings Financial statements Price history Forecast & ratings Earnings

Frequently asked questions

CTKB insider trading · 5 questions

The insiders of Cytek Biosciences, Inc. (CTKB) include executives and directors such as Busque Philippe (SVP, GLOBAL SALES AND SERVICES), Jiang Wenbin (PRESIDENT AND CEO · Director), Barnett Valerie (CHIEF LEGAL OFFICER), among others. Over the past 12 months, 5 insiders have filed Form 4 transactions with the SEC. Insider transactions are required to be reported within 2 business days of the trade date.

CTKB board member insider tradingwho are CTKB insidersCTKB insider rosterCytek Biosciences, Inc. executives insider activity

▸ Source: FMP /stable/insider-trading/search · SEC EDGAR Form 3 & 4 · acquisitionOrDisposition A=Buy, D=Sell · RSU vesting (M-Exempt) excluded from sentiment bar · As of Jun 8, 2026