CTKB · Cytek Biosciences, Inc. · Insider Trading

$5.89 +0.30 (+5.37%) At close · Oct 26

Russell 2000 member Rebalance outlook locked

Market Cap

$765.60M

129.98M

Volume · Oct 26 1.24M Avg daily vol (3M) 1.13M

Trades by corporate insiders — officers, directors and holders of more than 10% of the shares — disclosed to the SEC on Forms 4 and 5. Form 3 supplies initial ownership rather than a trade; Form 4 must be filed within two business days of the trade.

Query insider transactions through the insider trading API or MCP →

Date	Insider	Role	Type	Security	Shares	Price	Value	After
2026-08-18	Yan Ming	Director, CHIEF TECHNOLOGY OFFICER	Tax↓ Filing footnotes — Common Stock (Direct) Represents the number of shares withheld by and surrendered to the Issuer on August 18, 2026 to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.	Common Stock	1,346	$4.67	$6,286	4,806,452
2026-08-18	Jiang Wenbin	Director, PRESIDENT AND CEO	Convert↓ Filing footnotes — Restricted Stock Units (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. The shares underlying the RSU Award shall vest over 4 years, with 2/48 of the total shares underlying the RSU Award vesting on May 18, 2025 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on August 18, 2025 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on November 18, 2025 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting on March 10, 2026 and each March 10 thereafter.	Restricted Stock Units	29,002	—	—	299,694
2026-08-18	Yan Ming	Director, CHIEF TECHNOLOGY OFFICER	Convert↑ Filing footnotes — Common Stock (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.	Common Stock	7,363	—	—	4,804,051
2026-08-18	MUIR GLENN P	Director	Convert↓ Filing footnotes — Restricted Stock Units (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. The shares underlying the RSU Award shall vest over 3 years, with 2/36 of the total shares underlying the RSU Award vesting on August 18, 2026; 3/36 of the total shares underlying the RSU Award vesting on November 18, 2026 and each November 18 thereafter; 4/36 of the total shares underlying the RSU Award vesting on March 10, 2027 and each March 10 thereafter; 3/36 of the total shares underlying the RSU Award vesting on May 18, 2027 and each May 18 thereafter; and 3/36 of the total shares underlying the RSU Award vesting on August 18, 2027 and each August 18 thereafter.	Restricted Stock Units	3,086	—	—	52,469
2026-08-18	Yan Ming	Director, CHIEF TECHNOLOGY OFFICER	Tax↓ Filing footnotes — Common Stock (Direct) Represents the number of shares withheld by and surrendered to the Issuer on August 18, 2026 to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.	Common Stock	1,778	$4.67	$8,303	4,802,273
2026-08-18	Jiang Wenbin	Director, PRESIDENT AND CEO	Convert↓ Filing footnotes — Restricted Stock Units (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. The shares underlying the RSU Award shall vest over 4 years, with 2/48 of the total shares underlying the RSU Award vesting on May 18, 2023 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on August 18, 2023 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on November 18, 2023 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting on March 10, 2024 and each March 10 thereafter.	Restricted Stock Units	11,781	—	—	27,494
2026-08-18	Yan Ming	Director, CHIEF TECHNOLOGY OFFICER	Tax↓ Filing footnotes — Common Stock (Direct) Represents the number of shares withheld by and surrendered to the Issuer on August 18, 2026 to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.	Common Stock	1,501	$4.67	$7,010	4,811,113
2026-08-18	McCombe William D.	Director, Chief Financial Officer	Convert↑ Filing footnotes — Common Stock (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.	Common Stock	16,049	—	—	140,094
2026-08-18	Yan Ming	Director, CHIEF TECHNOLOGY OFFICER	Tax↓ Filing footnotes — Common Stock (Direct) Represents the number of shares withheld by and surrendered to the Issuer on August 18, 2026 to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.	Common Stock	3,463	$4.67	$16,172	4,821,870
2026-08-18	Yan Ming	Director, CHIEF TECHNOLOGY OFFICER	Convert↑ Filing footnotes — Common Stock (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.	Common Stock	6,162	—	—	4,812,614
2026-08-18	McCombe William D.	Director, Chief Financial Officer	Tax↓ Filing footnotes — Common Stock (Direct) Represents the number of shares withheld by and surrendered to the Issuer on August 18, 2026 to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.	Common Stock	2,111	$4.67	$9,858	115,386
2026-08-18	Jiang Wenbin	Director, PRESIDENT AND CEO	Tax↓ Filing footnotes — Common Stock (Direct) Represents the number of shares withheld by and surrendered to the Issuer on August 18, 2026 to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.	Common Stock	5,382	$4.67	$25,134	5,502,833
2026-08-18	Yan Ming	Director, CHIEF TECHNOLOGY OFFICER	Convert↓ Filing footnotes — Restricted Stock Units (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. The shares underlying the RSU Award shall vest over 4 years, with 2/48 of the total shares underlying the RSU Award vesting on May 18, 2023 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on August 18, 2023 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on November 18, 2023 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting on March 10, 2024 and each March 10 thereafter.	Restricted Stock Units	7,363	—	—	17,189
2026-08-18	Yan Ming	Director, CHIEF TECHNOLOGY OFFICER	Convert↓ Filing footnotes — Restricted Stock Units (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. The shares underlying the RSU Award shall vest over 4 years, with 2/48 of the total shares underlying the RSU Award vesting on May 18, 2024 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on August 18, 2024 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on November 18, 2024 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting on March 10, 2025 and each March 10 thereafter.	Restricted Stock Units	5,525	—	—	34,995
2026-08-18	McCombe William D.	Director, Chief Financial Officer	Convert↑ Filing footnotes — Common Stock (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.	Common Stock	13,051	—	—	128,437
2026-08-18	MUIR GLENN P	Director	Convert↑ Filing footnotes — Common Stock (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.	Common Stock	3,086	—	—	3,086
2026-08-18	McCombe William D.	Director, Chief Financial Officer	Tax↓ Filing footnotes — Common Stock (Direct) Represents the number of shares withheld by and surrendered to the Issuer on August 18, 2026 to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.	Common Stock	5,401	$4.67	$25,223	134,693
2026-08-18	Holder Michael	Director	Convert↓ Filing footnotes — Restricted Stock Units (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. The shares underlying the RSU Award shall vest over 3 years, with 2/36 of the total shares underlying the RSU Award vesting on August 18, 2024; 3/36 of the total shares underlying the RSU Award vesting on November 18, 2024 and each November 18 thereafter; 4/36 of the total shares underlying the RSU Award vesting on March 10, 2025 and each March 10 thereafter; 2/36 of the total shares underlying the RSU Award vesting on May 18, 2025 and each May 18 thereafter; and 3/36 of the total shares underlying the RSU Award vesting on August 18, 2025 and each August 18 thereafter.	Restricted Stock Units	2,181	—	—	7,276
2026-08-18	McCombe William D.	Director, Chief Financial Officer	Convert↓ Filing footnotes — Restricted Stock Units (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. The shares underlying the RSU Award shall vest over 4 years, with 2/48 of the total shares underlying the RSU Award vesting on May 18, 2026 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on August 18, 2026 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on November 18, 2026 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting on March 10, 2027 and each March 10 thereafter.	Restricted Stock Units	16,049	—	—	230,042
2026-08-18	Chin Richard	Director	Convert↓ Filing footnotes — Restricted Stock Units (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. The shares underlying the RSU Award shall vest over 3 years, with 2/36 of the total shares underlying the RSU Award vesting on August 18, 2025; 3/36 of the total shares underlying the RSU Award vesting on November 18, 2025 and each November 18 thereafter; 3/36 of the total shares underlying the RSU Award vesting on March 10, 2026 and each March 10 thereafter; 3/36 of the total shares underlying the RSU Award vesting on May 18, 2026 and each May 18 thereafter; and 3/36 of the total shares underlying the RSU Award vesting on August 18, 2026 and each August 18 thereafter.	Restricted Stock Units	6,107	—	—	44,790
2026-08-18	Yan Ming	Director, CHIEF TECHNOLOGY OFFICER	Convert↓ Filing footnotes — Restricted Stock Units (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. The shares underlying the RSU Award shall vest over 4 years, with 2/48 of the total shares underlying the RSU Award vesting on May 18, 2025 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on August 18, 2025 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on November 18, 2025 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting on March 10, 2026 and each March 10 thereafter.	Restricted Stock Units	6,162	—	—	63,688
2026-08-18	Jiang Wenbin	Director, PRESIDENT AND CEO	Tax↓ Filing footnotes — Common Stock (Direct) Represents the number of shares withheld by and surrendered to the Issuer on August 18, 2026 to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.	Common Stock	20,956	$4.67	$97,865	5,561,029
2026-08-18	Jiang Wenbin	Director, PRESIDENT AND CEO	Convert↑ Filing footnotes — Common Stock (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.	Common Stock	11,781	—	—	5,488,984
2026-08-18	Chin Richard	Director	Convert↑ Filing footnotes — Common Stock (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.	Common Stock	6,107	—	—	28,499
2026-08-18	McCombe William D.	Director, Chief Financial Officer	Convert↓ Filing footnotes — Restricted Stock Units (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. The shares underlying the RSU Award shall vest over 4 years, with 12/48 of the total shares underlying the RSU Award vesting on May 18, 2025; 3/48 of the total shares underlying the RSU Award vesting on August 18, 2025 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on November 18, 2025 and each November 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on March 10, 2026 and each March 10 thereafter; and 3/48 of the total shares underlying the RSU Award vesting on May 18, 2026 and each May 18 thereafter.	Restricted Stock Units	6,320	—	—	44,249
2026-08-18	Jiang Wenbin	Director, PRESIDENT AND CEO	Convert↓ Filing footnotes — Restricted Stock Units (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. The shares underlying the RSU Award shall vest over 4 years, with 2/48 of the total shares underlying the RSU Award vesting on May 18, 2024 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on August 18, 2024 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on November 18, 2024 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting on March 10, 2025 and each March 10 thereafter.	Restricted Stock Units	22,100	—	—	139,973
2026-08-18	Jiang Wenbin	Director, PRESIDENT AND CEO	Convert↓ Filing footnotes — Restricted Stock Units (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. The shares underlying the RSU Award shall vest over 4 years, with 2/48 of the total shares underlying the RSU Award vesting on May 18, 2026 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on August 18, 2026 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on November 18, 2026 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting on March 10, 2027 and each March 10 thereafter.	Restricted Stock Units	57,212	—	—	820,054
2026-08-18	Holder Michael	Director	Convert↑ Filing footnotes — Common Stock (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.	Common Stock	2,181	—	—	62,875
2026-08-18	Jiang Wenbin	Director, PRESIDENT AND CEO	Convert↑ Filing footnotes — Common Stock (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.	Common Stock	29,002	—	—	5,531,835
2026-08-18	McCombe William D.	Director, Chief Financial Officer	Convert↓ Filing footnotes — Restricted Stock Units (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. The shares underlying the RSU Award shall vest over 4 years, with 2/48 of the total shares underlying the RSU Award vesting on May 18, 2025 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on August 18, 2025 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on November 18, 2025 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting on March 10, 2026 and each March 10 thereafter.	Restricted Stock Units	13,051	—	—	134,862
2026-08-18	Jiang Wenbin	Director, PRESIDENT AND CEO	Tax↓ Filing footnotes — Common Stock (Direct) Represents the number of shares withheld by and surrendered to the Issuer on August 18, 2026 to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.	Common Stock	2,869	$4.67	$13,398	5,486,115
2026-08-18	Yan Ming	Director, CHIEF TECHNOLOGY OFFICER	Convert↑ Filing footnotes — Common Stock (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.	Common Stock	5,525	—	—	4,807,798
2026-08-18	Yan Ming	Director, CHIEF TECHNOLOGY OFFICER	Convert↓ Filing footnotes — Restricted Stock Units (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. The shares underlying the RSU Award shall vest over 4 years, with 2/48 of the total shares underlying the RSU Award vesting on May 18, 2026 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on August 18, 2026 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on November 18, 2026 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting on March 10, 2027 and each March 10 thereafter.	Restricted Stock Units	14,220	—	—	203,835
2026-08-18	Jiang Wenbin	Director, PRESIDENT AND CEO	Tax↓ Filing footnotes — Common Stock (Direct) Represents the number of shares withheld by and surrendered to the Issuer on August 18, 2026 to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.	Common Stock	7,062	$4.67	$32,980	5,524,773
2026-08-18	Jiang Wenbin	Director, PRESIDENT AND CEO	Convert↑ Filing footnotes — Common Stock (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.	Common Stock	22,100	—	—	5,508,215
2026-08-18	Yan Ming	Director, CHIEF TECHNOLOGY OFFICER	Convert↑ Filing footnotes — Common Stock (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.	Common Stock	14,220	—	—	4,825,333
2026-08-18	Jiang Wenbin	Director, PRESIDENT AND CEO	Convert↑ Filing footnotes — Common Stock (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.	Common Stock	57,212	—	—	5,581,985
2026-08-18	McCombe William D.	Director, Chief Financial Officer	Tax↓ Filing footnotes — Common Stock (Direct) Represents the number of shares withheld by and surrendered to the Issuer on August 18, 2026 to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.	Common Stock	4,392	$4.67	$20,511	124,045
2026-08-18	McCombe William D.	Director, Chief Financial Officer	Convert↑ Filing footnotes — Common Stock (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.	Common Stock	6,320	—	—	117,497
2026-08-10	Feuchtwang Ilan	Chief Legal Officer, Secretary	Award↑ Filing footnotes — Employee Stock Option (right to buy) (Direct) The shares subject to the option shall vest over 4 years with 25% vesting on August 10, 2027 and 1/48 of the shares vesting each month thereafter, until fully vested (in each case, subject to the Reporting Person's Continuous Service (as defined in the 2021 Plan)).	Employee Stock Option (right to buy)	127,118	—	—	127,118
2026-08-10	Feuchtwang Ilan	Chief Legal Officer, Secretary	Award↑ Filing footnotes — Restricted Stock Units (Direct) Each restricted stock unit (the "RSU") represents a contingent right to receive one share of the Issuer's common stock. The RSUs shall vest and settle into common stock over 4 years, with 12/48 of the RSUs vesting on August 18, 2027; 3/48 of the RSUs vesting on November 18, 2027 and each November 18 thereafter; 4/48 of the RSUs vesting on March 10, 2028 and each March 10 thereafter; 2/48 of the RSUs vesting on May 18, 2028 and each May 18 thereafter; and 3/48 of the RSUs vesting on August 18, 2028 and each August 18 thereafter, until fully vested (in each case, subject to the Reporting Person's Continuous Service (as defined in the Issuer's 2021 Equity Invesntive Plan (the "2021 Plan"))).	Restricted Stock Units	241,416	—	—	241,416
2026-06-12	Yan Ming	Director, CHIEF TECHNOLOGY OFFICER	Gift↓	Common Stock	135,892	—	—	4,796,688
2026-06-10	Imper Vera	Director	Award↑ Filing footnotes — Restricted Stock Units (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. 100% of the shares subject to the RSU Award shall vest on the earlier of June 10, 2027 and the date of the Issuer's 2027 annual meeting of stockholders (provided such meeting is held in June 2027).	Restricted Stock Units	33,333	—	—	33,333
2026-06-10	NEFF DEBORAH J	Director	Award↑ Filing footnotes — Restricted Stock Units (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. 100% of the shares subject to the RSU Award shall vest on the earlier of June 10, 2027 and the date of the Issuer's 2027 annual meeting of stockholders (provided such meeting is held in June 2027).	Restricted Stock Units	33,333	—	—	33,333
2026-06-10	Holder Michael	Director	Award↑ Filing footnotes — Director Stock Option (right to buy) (Direct) 100% of the shares subject to the option shall vest on the earlier of June 10, 2027 and the date of the Issuer's 2027 annual meeting of stockholders (provided such meeting is held in June 2027).	Director Stock Option (right to buy)	18,261	—	—	18,261
2026-06-10	Chin Richard	Director	Award↑ Filing footnotes — Director Stock Option (right to buy) (Direct) 100% of the shares subject to the option shall vest on the earlier of June 10, 2027 and the date of the Issuer's 2027 annual meeting of stockholders (provided such meeting is held in June 2027).	Director Stock Option (right to buy)	18,261	—	—	18,261
2026-06-10	Holder Michael	Director	Convert↓ Filing footnotes — Restricted Stock Units (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. 100% of the shares subject to the RSU Award vested on June 10, 2026.	Restricted Stock Units	43,973	—	—	0
2026-06-10	Holder Michael	Director	Convert↑ Filing footnotes — Common Stock (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.	Common Stock	43,973	—	—	60,694
2026-06-10	Imper Vera	Director	Convert↓ Filing footnotes — Restricted Stock Units (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. 100% of the shares subject to the RSU Award vested on June 10, 2026.	Restricted Stock Units	43,973	—	—	0
2026-06-10	Holder Michael	Director	Award↑ Filing footnotes — Restricted Stock Units (Direct) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. 100% of the shares subject to the RSU Award shall vest on the earlier of June 10, 2027 and the date of the Issuer's 2027 annual meeting of stockholders (provided such meeting is held in June 2027).	Restricted Stock Units	33,333	—	—	33,333

Legend Buy — open-market purchase Sell — open-market sale ↑ Shares acquired ↓ Shares disposed (gift, conversion, tax…)

Showing 1–50 of 980 transactions

Key facts CIK 1831915 CUSIP 23285D109 13F (30d) 19 filings 19 filers Visit website Investor relations