CTKB: Millennium-related filers report 6.1% and 5.4% stakes (May 15, 2026)

Rhea-AI Filing Summary

Cytek Biosciences, Inc. reports an amended Schedule 13G/A identifying large passive holders and a joint filing agreement. The amendment lists Integrated Core Strategies (US) LLC, Millennium Management LLC, Millennium Group Management LLC and Israel A. Englander as filing participants. The cover entries show shared voting and dispositive power positions of 6,974,492 shares (5.4%) and 7,872,900 shares (6.1%) for listed filers. The filing states these securities are held by entities subject to voting control and investment discretion by Millennium-related managers and attaches a Joint Filing Agreement dated May 15, 2026.

Insights

Corporate Governance Analyst

Amendment clarifies group ownership and shared control among Millennium-related entities.

The amendment to the Schedule 13G/A lists multiple related filers and quantifies their shared voting and shared dispositive holdings: 6,974,492 and 7,872,900 shares in the cover excerpts, with percentages of 5.4% and 6.1% respectively. It also states that the shares are held by entities subject to voting control and investment discretion by Millennium-related managers.

The filing includes a Joint Filing Agreement (May 15, 2026), formalizing coordinated disclosures. Subsequent SEC filings will reflect any material changes in ownership or voting arrangements.

Regulatory Filings Specialist

The amendment is procedural, aligning disclosure across related parties via a joint filing agreement.

The Schedule 13G/A amendment identifies the persons, addresses, and citizenship for each filer and references Item responses (voting/dispositive powers, percent ownership). It reiterates that beneficial ownership assertions are qualified by control relationships and should not be construed as admissions of direct beneficial ownership.

For readers tracking ownership, the attached Joint Filing Agreement and the Itemized cover responses are the controlling disclosures to reference for exact attribution.

Key Figures

Shared voting/dispositive power: 6,974,492 shares Shared voting/dispositive power: 7,872,900 shares Percent of class: 5.4% +2 more

5 metrics

Shared voting/dispositive power 6,974,492 shares Listed for Integrated Core Strategies (US) LLC; cover entry

Shared voting/dispositive power 7,872,900 shares Listed for Millennium Management LLC / Millennium Group Management LLC / Israel A. Englander; cover entries

Percent of class 5.4% Associated with 6,974,492 shares on cover excerpt

Percent of class 6.1% Associated with 7,872,900 shares on cover excerpt

Joint Filing Agreement date May 15, 2026 Exhibit I to the amendment

Key Terms

Schedule 13G/A, shared dispositive power, Joint Filing Agreement

3 terms

Schedule 13G/A regulatory

"Amendment No. 1 Cytek Biosciences, Inc. Common Stock"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

shared dispositive power regulatory

"Shared Dispositive Power 6,974,492.00 Shared Dispositive Power 7,872,900.00"

Joint Filing Agreement regulatory

"Exhibit I: Joint Filing Agreement, dated as of May 15, 2026"

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Cytek Biosciences, Inc.

(Name of Issuer)

Common Stock, par value $0.001 per share

(Title of Class of Securities)

23285D109

(CUSIP Number)

05/11/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 23285D109

1

Names of Reporting Persons

Integrated Core Strategies (US) LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 6,974,492.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 6,974,492.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

6,974,492.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.4 %

12

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13G

CUSIP Number(s): 23285D109

1

Names of Reporting Persons

Millennium Management LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 7,872,900.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 7,872,900.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

7,872,900.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

6.1 %

12

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13G

CUSIP Number(s): 23285D109

1

Names of Reporting Persons

Millennium Group Management LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 7,872,900.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 7,872,900.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

7,872,900.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

6.1 %

12

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13G

CUSIP Number(s): 23285D109

1

Names of Reporting Persons

Israel A. Englander

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 7,872,900.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 7,872,900.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

7,872,900.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

6.1 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Cytek Biosciences, Inc.
(b)	Address of issuer's principal executive offices: 47215 Lakeview Boulevard, Fremont, California 94538
Item 2.
(a)	Name of person filing: Integrated Core Strategies (US) LLC Millennium Management LLC Millennium Group Management LLC Israel A. Englander
(b)	Address or principal business office or, if none, residence: Integrated Core Strategies (US) LLC c/o Millennium Management LLC 399 Park Avenue New York, New York 10022 Millennium Management LLC 399 Park Avenue New York, New York 10022 Millennium Group Management LLC 399 Park Avenue New York, New York 10022 Israel A. Englander c/o Millennium Management LLC 399 Park Avenue New York, New York 10022
(c)	Citizenship: Integrated Core Strategies (US) LLC - Delaware Millennium Management LLC - Delaware Millennium Group Management LLC - Delaware Israel A. Englander - United States
(d)	Title of class of securities: Common Stock, par value $0.001 per share
(e)	CUSIP No.: 23285D109
Item 4.	Ownership
(a)	Amount beneficially owned: See response to Item 9 on each cover page.
(b)	Percent of class: See response to Item 11 on each cover page.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: See response to Item 5 on each cover page.
	(ii) Shared power to vote or to direct the vote: See response to Item 6 on each cover page.
	(iii) Sole power to dispose or to direct the disposition of: See response to Item 7 on each cover page.
	(iv) Shared power to dispose or to direct the disposition of: See response to Item 8 on each cover page. The securities disclosed herein as potentially beneficially owned by Millennium Management LLC, Millennium Group Management LLC and Mr. Englander are held by entities subject to voting control and investment discretion by Millennium Management LLC and/or other investment managers that may be controlled by Millennium Group Management LLC (the managing member of Millennium Management LLC) and Mr. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). The foregoing should not be construed in and of itself as an admission by Millennium Management LLC, Millennium Group Management LLC or Mr. Englander as to beneficial ownership of the securities held by such entities.
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	If a group has filed this schedule pursuant to §240.13d-1(b)(1)(ii)(J), so indicate under Item 3(j) and attach an exhibit stating the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to §240.13d-1(c) or §240.13d-1(d), attach an exhibit stating the identity of each member of the group. See Exhibit I
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Integrated Core Strategies (US) LLC

Signature:	/s/ Gil Raviv
Name/Title:	Gil Raviv, Global General Counsel
Date:	05/15/2026

Millennium Management LLC

Signature:	/s/ Gil Raviv
Name/Title:	Gil Raviv, Global General Counsel
Date:	05/15/2026

Millennium Group Management LLC

Signature:	/s/ Gil Raviv
Name/Title:	Gil Raviv, Global General Counsel
Date:	05/15/2026

Israel A. Englander

Signature:	/s/ Israel A. Englander
Name/Title:	Israel A. Englander
Date:	05/15/2026

Comments accompanying signature: ** INTEGRATED CORE STRATEGIES (US) LLC By: Integrated Holding Group LP, its Managing Member By: Millennium Management LLC, its General Partner

Exhibit Information

Exhibit I: Joint Filing Agreement, dated as of May 15, 2026, by and among Integrated Core Strategies (US) LLC, Millennium Management LLC, Millennium Group Management LLC and Israel A. Englander.

FAQ

What does the CTKB Schedule 13G/A amendment disclose?

The amendment names four filers and provides ownership details. It lists Integrated Core Strategies (US) LLC, Millennium Management LLC, Millennium Group Management LLC, and Israel A. Englander with shared holdings and a Joint Filing Agreement dated May 15, 2026.

How many shares and what percent are shown for the filers in the CTKB filing?

The cover excerpt shows holdings of 6,974,492 shares (5.4%) and 7,872,900 shares (6.1%) associated with the listed filers per the Item 6/8 cover entries in the amendment.

Does the filing state who controls the voting or investment decisions?

Yes. The amendment states the securities are held by entities subject to voting control and investment discretion by Millennium Management LLC and related managers, as described in the Item 4 explanations.

What is the Joint Filing Agreement referenced in the CTKB amendment?

The Joint Filing Agreement, dated May 15, 2026, is an exhibit to the amendment that formalizes coordinated Schedule 13G/A disclosure among the filers named in the filing.

Does the amendment admit direct beneficial ownership by the filers?

No. The filing expressly states the foregoing should not be construed as an admission by Millennium Management LLC, Millennium Group Management LLC or Mr. Englander of beneficial ownership of securities held by related entities.