Ming Yan - 18 Aug 2026 Form 4 Insider Report for Cytek Biosciences, Inc. (CTKB)

Reporting relationship
CHIEF TECHNOLOGY OFFICER, Director
Issuer ticker
CTKB
Reported as of
18 Aug 2026
Net transaction value
$0
Source evidence Original filing metadata and source links for verification. 4 source fields
SEC form
4
Accepted by SEC
20 Aug 2026, 16:22:56 UTC
Prior SEC filing
16 Jun 2026
Source filing
View source filing
Reporting owner 1 detail
Reporting owner signature
/s/ Gordon Ho, Attorney-in-Fact

Key filing fact

Ming Yan filed Form 4 for Cytek Biosciences, Inc. (CTKB) on 20 Aug 2026.

Key facts

  • This page summarizes Ming Yan's Form 4 filing for Cytek Biosciences, Inc. (CTKB).
  • 12 reported transactions and 4 derivative rows are listed below.
  • Accepted by SEC: 20 Aug 2026, 16:22.

Change

  • Previous filing in this sequence was filed on 16 Jun 2026.
  • Current net transaction value: $0.

Research use

  • This tells you what this filing adds before you inspect full transaction and derivative tables.
  • You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001874041 Primary reporting owner

Yan Ming

Relationship
CHIEF TECHNOLOGY OFFICER, Director
Address
C/O CYTEK BIOSCIENCES, INC., 47215 LAKEVIEW BOULEVARD, FREMONT
Signature
/s/ Gordon Ho, Attorney-in-Fact
Signature date
20 Aug 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

CTKB transaction

Common Stock

Options Exercise

Transaction value
Shares
+7,363
Change %
+0.15%
Price
Shares after
4,804,051
Date
18 Aug 2026
Ownership
Direct
Footnotes
F1
CTKB transaction

Common Stock

Tax liability

Transaction value
Shares
-1,778
Change %
-0.04%
Price
$4.67*
Shares after
4,802,273
Date
18 Aug 2026
Ownership
Direct
Footnotes
F2
CTKB transaction

Common Stock

Options Exercise

Transaction value
Shares
+5,525
Change %
+0.12%
Price
Shares after
4,807,798
Date
18 Aug 2026
Ownership
Direct
Footnotes
F1
CTKB transaction

Common Stock

Tax liability

Transaction value
Shares
-1,346
Change %
-0.03%
Price
$4.67*
Shares after
4,806,452
Date
18 Aug 2026
Ownership
Direct
Footnotes
F2
CTKB transaction

Common Stock

Options Exercise

Transaction value
Shares
+6,162
Change %
+0.13%
Price
Shares after
4,812,614
Date
18 Aug 2026
Ownership
Direct
Footnotes
F1
CTKB transaction

Common Stock

Tax liability

Transaction value
Shares
-1,501
Change %
-0.03%
Price
$4.67*
Shares after
4,811,113
Date
18 Aug 2026
Ownership
Direct
Footnotes
F2
CTKB transaction

Common Stock

Options Exercise

Transaction value
Shares
+14,220
Change %
+0.3%
Price
Shares after
4,825,333
Date
18 Aug 2026
Ownership
Direct
Footnotes
F1
CTKB transaction

Common Stock

Tax liability

Transaction value
Shares
-3,463
Change %
-0.07%
Price
$4.67*
Shares after
4,821,870
Date
18 Aug 2026
Ownership
Direct
Footnotes
F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

CTKB transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares
-7,363
Change %
-30%
Price
$0.000000*
Shares after
17,189
Date
18 Aug 2026
Ownership
Direct
Underlying class
Common Stock
Underlying amount
7,363
Exercise price
Footnotes
F1, F3
CTKB transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares
-5,525
Change %
-14%
Price
$0.000000*
Shares after
34,995
Date
18 Aug 2026
Ownership
Direct
Underlying class
Common Stock
Underlying amount
5,525
Exercise price
Footnotes
F1, F4
CTKB transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares
-6,162
Change %
-8.8%
Price
$0.000000*
Shares after
63,688
Date
18 Aug 2026
Ownership
Direct
Underlying class
Common Stock
Underlying amount
6,162
Exercise price
Footnotes
F1, F5
CTKB transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares
-14,220
Change %
-6.5%
Price
$0.000000*
Shares after
203,835
Date
18 Aug 2026
Ownership
Direct
Underlying class
Common Stock
Underlying amount
14,220
Exercise price
Footnotes
F1, F6
* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 6 footnotes

Footnote F1

Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

Footnote F2

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.

Footnote F3

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.

Footnote F4

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.

Footnote F5

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.

Footnote F6

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.

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