<div id="readability-page-1"><div>Jiang Wenbin Chairman of the Board of Cytek BioSciences Inc [CTKB] filed a Form 4 on November 20, 2025 with the Securities and Exchange Commission disclosing the following changes in ownership:<div><table><tbody><tr><th>Date</th><th>Transaction</th><th>Shares</th><th>Price</th><th>Value</th></tr><tr><td>11/18/25</td><td>Exercise</td><td>69,641</td><td>$0.00</td><td>N/A</td></tr><tr><td>11/18/25</td><td>Surrender(1)</td><td>27,406</td><td>$5.53</td><td>$151,555</td></tr></tbody></table></div>Ending Holdings: 5,356,652 - Direct<ul><li>(1)</li><li>Surrender of shares back to company to pay option exercise cost and/or resulting tax liability.</li></ul>For a free trial, or to learn more about our insider trading analysis and data services, please visit http://www.washingtonservice.com or contact us at (301) 913-5100 or send an email to info@washingtonservice.com.Founded in 1970, The Washington Service provides securities professionals with financial, economic and public policy research and data. </div></div>

CTKB

Jiang Wenbin, Chairman of Cytek BioSciences Inc [CTKB], filed a Form 4 with the SEC on November 20, 2025, disclosing changes in ownership. On November 18, 2025, he exercised 69,641 shares and surrendered 27,406 shares at $5.53 each to cover option exercise costs and/or tax liabilities. His ending holdings are 5,356,652 shares directly.

Chmn Jiang Acquires 42,235 Of Cytek BioSciences Inc [CTKB]