Insider · CIK 0001873091

Barnett Valerie

Reports to the SEC for 1 company · FREMONT, CA

sec.gov

Transactions

Companies

Filings

CIK

0001873091

Forms 4 and 5

Insider transactions

50 trades

Date	Company	Role	Code	Shares	Price	Value	Shares after
2026-05-18	CTKBCytek Biosciences, Inc. · Restricted Stock UnitsM Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	−2,454 sh	—	—	12,280
2026-05-18	CTKBCytek Biosciences, Inc.F Tax Payment	CHIEF LEGAL OFFICER	FTax Payment	−3,386 sh	$3.55	−$12K	150,012
2026-05-18	CTKBCytek Biosciences, Inc.M Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	+5,156 sh	—	—	141,165
2026-05-18	CTKBCytek Biosciences, Inc.M Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	+9,435 sh	—	—	153,398
2026-05-18	CTKBCytek Biosciences, Inc. · Restricted Stock UnitsM Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	−5,156 sh	—	—	56,728
2026-05-18	CTKBCytek Biosciences, Inc.F Tax Payment	CHIEF LEGAL OFFICER	FTax Payment	−881 sh	$3.55	−$3,127.55	136,009
2026-05-18	CTKBCytek Biosciences, Inc.F Tax Payment	CHIEF LEGAL OFFICER	FTax Payment	−2,602 sh	$3.55	−$9,237.1	143,963
2026-05-18	CTKBCytek Biosciences, Inc. · Restricted Stock UnitsM Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	−7,250 sh	—	—	123,262
2026-05-18	CTKBCytek Biosciences, Inc.F Tax Payment	CHIEF LEGAL OFFICER	FTax Payment	−1,850 sh	$3.55	−$6,567.5	139,315
2026-05-18	CTKBCytek Biosciences, Inc.M Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	+2,454 sh	—	—	136,890
2026-05-18	CTKBCytek Biosciences, Inc.M Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	+7,250 sh	—	—	146,565
2026-05-18	CTKBCytek Biosciences, Inc. · Restricted Stock UnitsM Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	−9,435 sh	—	—	217,018
2026-03-10	CTKBCytek Biosciences, Inc.M Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	+14.5K sh	—	—	140,176
2026-03-10	CTKBCytek Biosciences, Inc.F Tax Payment	CHIEF LEGAL OFFICER	FTax Payment	−5,740 sh	$4.23	−$24.3K	134,436
2026-03-10	CTKBCytek Biosciences, Inc. · Restricted Stock UnitsM Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	−14.5K sh	—	—	130,512
2026-03-10	CTKBCytek Biosciences, Inc.F Tax Payment	CHIEF LEGAL OFFICER	FTax Payment	−4,247 sh	$4.23	−$18K	125,675
2026-03-10	CTKBCytek Biosciences, Inc. · Employee Stock Option (right to buy)A Award	CHIEF LEGAL OFFICER	AAward	+120K sh	—	—	120,114
2026-03-10	CTKBCytek Biosciences, Inc.F Tax Payment	CHIEF LEGAL OFFICER	FTax Payment	−1,761 sh	$4.23	−$7,449.03	119,609
2026-03-10	CTKBCytek Biosciences, Inc. · Restricted Stock UnitsM Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	−10.3K sh	—	—	61,884
2026-03-10	CTKBCytek Biosciences, Inc.M Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	+4,908 sh	—	—	121,370
2026-03-10	CTKBCytek Biosciences, Inc.M Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	+10.3K sh	—	—	129,922
2026-03-10	CTKBCytek Biosciences, Inc. · Restricted Stock UnitsM Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	−4,908 sh	—	—	14,734
2026-03-10	CTKBCytek Biosciences, Inc. · Restricted Stock UnitsA Award	CHIEF LEGAL OFFICER	AAward	+226K sh	—	—	226,453
2026-02-18	CTKBCytek Biosciences, Inc.M Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	+1,346 sh	—	—	116,987
2026-02-18	CTKBCytek Biosciences, Inc.F Tax Payment	CHIEF LEGAL OFFICER	FTax Payment	−525 sh	$4.20	−$2,205	116,462
2026-02-18	CTKBCytek Biosciences, Inc. · Restricted Stock UnitsM Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	−1,346 sh	—	—	0
2025-11-18	CTKBCytek Biosciences, Inc.F Tax Payment	CHIEF LEGAL OFFICER	FTax Payment	−1,184 sh	$5.53	−$6,547.52	103,015
2025-11-18	CTKBCytek Biosciences, Inc. · Restricted Stock UnitsM Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	−10.9K sh	—	—	145,013
2025-11-18	CTKBCytek Biosciences, Inc. · Restricted Stock UnitsM Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	−3,681 sh	—	—	19,642
2025-11-18	CTKBCytek Biosciences, Inc. · Restricted Stock UnitsM Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	−2,016 sh	—	—	1,346
2025-11-18	CTKBCytek Biosciences, Inc.M Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	+10.9K sh	—	—	119,138
2025-11-18	CTKBCytek Biosciences, Inc.F Tax Payment	CHIEF LEGAL OFFICER	FTax Payment	−2,487 sh	$5.53	−$13.8K	108,263
2025-11-18	CTKBCytek Biosciences, Inc.M Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	+7,735 sh	—	—	110,750
2025-11-18	CTKBCytek Biosciences, Inc.M Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	+3,681 sh	—	—	104,199
2025-11-18	CTKBCytek Biosciences, Inc.F Tax Payment	CHIEF LEGAL OFFICER	FTax Payment	−649 sh	$5.53	−$3,588.97	100,518
2025-11-18	CTKBCytek Biosciences, Inc.M Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	+2,016 sh	—	—	101,167
2025-11-18	CTKBCytek Biosciences, Inc. · Restricted Stock UnitsM Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	−7,735 sh	—	—	72,197
2025-11-18	CTKBCytek Biosciences, Inc.F Tax Payment	CHIEF LEGAL OFFICER	FTax Payment	−3,497 sh	$5.53	−$19.3K	115,641
2025-08-18	CTKBCytek Biosciences, Inc.M Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	+2,016 sh	—	—	85,689
2025-08-18	CTKBCytek Biosciences, Inc.F Tax Payment	CHIEF LEGAL OFFICER	FTax Payment	−786 sh	$4.06	−$3,191.16	84,903
2025-08-18	CTKBCytek Biosciences, Inc.F Tax Payment	CHIEF LEGAL OFFICER	FTax Payment	−3,000 sh	$4.06	−$12.2K	91,885
2025-08-18	CTKBCytek Biosciences, Inc.M Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	+10.9K sh	—	—	102,760
2025-08-18	CTKBCytek Biosciences, Inc. · Restricted Stock UnitsM Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	−10.9K sh	—	—	155,888
2025-08-18	CTKBCytek Biosciences, Inc. · Restricted Stock UnitsM Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	−7,735 sh	—	—	79,932
2025-08-18	CTKBCytek Biosciences, Inc.F Tax Payment	CHIEF LEGAL OFFICER	FTax Payment	−3,609 sh	$4.06	−$14.7K	99,151
2025-08-18	CTKBCytek Biosciences, Inc. · Restricted Stock UnitsM Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	−2,016 sh	—	—	3,362
2025-08-18	CTKBCytek Biosciences, Inc.M Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	+3,681 sh	—	—	88,584
2025-08-18	CTKBCytek Biosciences, Inc.F Tax Payment	CHIEF LEGAL OFFICER	FTax Payment	−1,434 sh	$4.06	−$5,822.04	87,150
2025-08-18	CTKBCytek Biosciences, Inc.M Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	+7,735 sh	—	—	94,885
2025-08-18	CTKBCytek Biosciences, Inc. · Restricted Stock UnitsM Exercise/Conversion	CHIEF LEGAL OFFICER	MExercise/Conversion	−3,681 sh	—	—	23,323

Recent filings

Accepted (ET)
May 204
Barnett Valerie0001873091-26-000004
SEC(opens sec.gov)
Mar 124
Barnett Valerie0001873091-26-000003
SEC(opens sec.gov)

Companies

Cytek Biosciences, Inc.CHIEF LEGAL OFFICERCTKB

Address

C/O CYTEK BIOSCIENCES, INC. 47215 LAKEVIEW BOULEVARD

FREMONT, CA, 94538