Deborah J. Neff

CIK: 0001221786

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)0 (0.0%)

Position reduction

Option Exercises (M)2 (33.3%)

Derivative conversions

Awards (A)4 (66.7%)

Compensation grants

Other (G, F, J, C, D, …)0 (0.0%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

CTKB

Cytek Biosciences, Inc.

Director

Discretionary Trading P&L

Holdings

Transaction History (6 total)

CTKB
Cytek Biosciences, Inc.
Jun 10, 2026
Exercise(M)
Direct
44K shares-
CTKB
Cytek Biosciences, Inc.
Jun 10, 2026
Award(A)
Restricted Stock Units
Direct
33.3K shares-
CTKB
Cytek Biosciences, Inc.
Jun 10, 2026
Award(A)
Director Stock Option (right to buy)
Direct
18.3K shares-
CTKB
Cytek Biosciences, Inc.
Jun 18, 2025
Award(A)
Restricted Stock Units
Direct
44K shares-
CTKB
Cytek Biosciences, Inc.
Jun 18, 2025
Award(A)
Director Stock Option (right to buy)
Direct
23.8K shares-
CTKB
Cytek Biosciences, Inc.
Jun 5, 2025
Exercise(M)
Direct
15.7K shares-

		Type	Shares	Price		Ownership
Jun 10, 2026	CTKB Cytek Biosciences, Inc.	Exercise(M)	43,973	-	$0	Direct
Jun 10, 2026	CTKB Cytek Biosciences, Inc.	Award(A) Restricted Stock Units	33,333	-	-	Direct
Jun 10, 2026	CTKB Cytek Biosciences, Inc.	Award(A) Director Stock Option (right to buy)	18,261	-	-	Direct
Jun 18, 2025	CTKB Cytek Biosciences, Inc.	Award(A) Restricted Stock Units	43,973	-	-	Direct
Jun 18, 2025	CTKB Cytek Biosciences, Inc.	Award(A) Director Stock Option (right to buy)	23,809	-	-	Direct
Jun 5, 2025	CTKB Cytek Biosciences, Inc.	Exercise(M)	15,706	-	-	Direct

1-6 of 6 transactions

About NEFF DEBORAH J

NEFF DEBORAH J (SEC CIK 0001221786) files insider reports with the SEC as Director of Cytek Biosciences, Inc. (CTKB).

Signal8 holds 3 ownership filings by NEFF DEBORAH J, all Form 4s, filed between Jun 9, 2025 and Jun 12, 2026. Those filings report 6 transactions, from Jun 5, 2025 to Jun 10, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on NEFF DEBORAH J's filings is in FREMONT, CA.

Recent filings by NEFF DEBORAH J

Jun 10, 2026: Option exercise of CTKB shares (Form 4, code M).
Jun 10, 2026: Grants or awards of CTKB derivative securities (2 lines, Form 4, code A).
Jun 18, 2025: Grants or awards of CTKB derivative securities (2 lines, Form 4, code A).
Jun 5, 2025: Option exercise of CTKB shares (Form 4, code M).

Other insiders filing for Cytek Biosciences, Inc. (CTKB)

Jiang Wenbin, PRESIDENT AND CEO
McCombe William D., Chief Financial Officer
MUIR GLENN P, Director
Holder Michael, Director
Chin Richard, Director
Yan Ming, CHIEF TECHNOLOGY OFFICER

How to read Form 4 transaction codes