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CTKB · Cytek Biosciences, Inc. · Shareholders & Ownership

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$5.89 +0.30 (+5.37%) At close · Oct 26
Market Cap
$765.60M
Shares
129.98M
Volume · Oct 26 1.24M Avg daily vol (3M) 1.13M

Every disclosed holder of CTKB in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

Who Owns CTKB

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions
Holder group Shares % Out
Institutional (13F) 81,321,484 62.56%
Insiders (Forms 3, 4, 5) 11,087,253 8.53%
13D/G-only blocks 4,958,016 3.81%
Remaining 32,616,500 25.09%
Registered funds (N-PORT, not summed) 28,568,601 21.98%

Shares outstanding: 129,983,253, the issuer's latest cover-page count restated onto today's split basis.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of CTKB

# Holder Shares
1
BlackRock, Inc.
13F CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
9,578,643
1.1
BlackRock, Inc.
13G CIK 2012383 · Holding company · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
9,356,551
1.2
iShares Russell 2000 ETF
Fund S000004344 · Registered fund · Jun 30, 2026
iShares Trust, not summed
3,164,683
1.3
iShares Russell 2000 Value ETF
Fund S000004342 · Registered fund · Jun 30, 2026
iShares Trust, not summed
1,107,950
1.4
iShares Biotechnology ETF
Fund S000004350 · Registered fund · Jun 30, 2026
iShares Trust, not summed
833,257
1.5
Master Small Cap Index Series
Fund S000002716 · Registered fund · Jun 30, 2026
Quantitative Master Series LLC, not summed
227,355
2
MILLENNIUM MANAGEMENT LLC
13F CIK 1273087 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
9,338,010
2.1
MILLENNIUM MANAGEMENT LLC
13G CIK 1273087 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(c), passive investor, not summed
9,338,010
3
Boston Partners
13F CIK 1386060 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
7,660,943
3.1
Boston Partners
13G CIK 1386060 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
7,635,145
4
HHLR ADVISORS, LTD.
13F CIK 1762304 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
6,657,030
5
Topline Capital Management, LLC
13F CIK 1792549 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
6,283,450
6
Jiang Wenbin
Insider CIK 1872873 · Aug 18, 2026
Director, PRESIDENT AND CEO, issuer-wide
5,561,029
6.1
Wenbin Jiang
13G CIK 1872873 · Unknown · Dec 31, 2023
Rule 13d-1(d), exempt investor, not summed
5,702,130
7
BROWN CAPITAL MANAGEMENT LLC
13G CIK 885062 · Registered investment adviser · Sep 30, 2025
Rule 13d-1(b), qualified institution
4,958,016
8
VANGUARD CAPITAL MANAGEMENT LLC
13F CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
4,939,597
9
Yan Ming
Insider CIK 1874041 · Aug 18, 2026
Director, CHIEF TECHNOLOGY OFFICER, issuer-wide
4,821,870
9.1
Ming Yan
13G CIK 1874041 · Unknown · Dec 31, 2023
Rule 13d-1(d), exempt investor, not summed
6,203,867
10
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
3,525,848
11
GEODE CAPITAL MANAGEMENT, LLC
13F CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
3,059,573
12
Column Small Cap Select Fund
Fund S000082920 · Registered fund · Aug 31, 2026
Trust for Professional Managers, not summed
2,735,577
13
DIMENSIONAL FUND ADVISORS LP
13F CIK 354204 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
2,616,257
13.1
U.S. SMALL CAP PORTFOLIO
Fund S000000971 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
566,763
13.2
Dimensional U.S. Core Equity 2 ETF
Fund S000070903 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
372,840
13.3
U.S. MICRO CAP PORTFOLIO
Fund S000000948 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
342,798
13.4
Dimensional U.S. Small Cap ETF
Fund S000070906 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
292,301
13.5
U.S. CORE EQUITY 2 PORTFOLIO
Fund S000000980 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
146,277
14
STATE STREET CORP
13F CIK 93751 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
2,566,121
14.1
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
Fund S000050332 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
40,900
14.2
State Street Total Return V.I.S. Fund
Fund S000001637 · Registered fund · Jun 30, 2026
STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
3,070
14.3
State Street Balanced Index Fund
Fund S000082802 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
661
15
GOLDMAN SACHS GROUP INC
13F CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
2,167,515
15.1
Goldman Sachs Small Cap Value Insights Fund
Fund S000014929 · Registered fund · Jul 31, 2026
Goldman Sachs Trust, not summed
639,133
15.2
Goldman Sachs Small Cap Equity Insights Fund
Fund S000009329 · Registered fund · Jul 31, 2026
Goldman Sachs Trust, not summed
214,816
15.3
Goldman Sachs ActiveBeta(R) U.S. Small Cap Equity ETF
Fund S000048296 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust, not summed
128,422
15.4
Goldman Sachs Variable Insurance Trust Small Cap Equity Insights Fund
Fund S000009355 · Registered fund · Jun 30, 2026
Goldman Sachs Variable Insurance Trust, not summed
69,967
15.5
Goldman Sachs Absolute Return Tracker Fund
Fund S000020314 · Registered fund · Aug 31, 2026
GOLDMAN SACHS TRUST, not summed
32,593
16
ROYCE & ASSOCIATES LP
13F CIK 906304 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
2,081,579
16.1
Royce Micro-Cap Fund
Fund S000009506 · Registered fund · Jun 30, 2026
ROYCE FUND, not summed
572,392
16.2
Royce Capital Fund - Micro-Cap Portfolio
Fund S000009496 · Registered fund · Jun 30, 2026
ROYCE CAPITAL FUND, not summed
188,830
17
Russell Investments Group, Ltd.
13F CIK 1692234 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
1,511,315
17.1
U.S. Small Cap Equity Fund
Fund S000001586 · Registered fund · Jul 31, 2026
RUSSELL INVESTMENT CO, not summed
313,184
17.2
Multi-Asset Strategy Fund
Fund S000055522 · Registered fund · Jul 31, 2026
RUSSELL INVESTMENT CO, not summed
229,122
17.3
Multi-Strategy Income Fund
Fund S000048356 · Registered fund · Jul 31, 2026
RUSSELL INVESTMENT CO, not summed
100,355
17.4
U.S. Small Cap Equity Fund
Fund S000006864 · Registered fund · Jun 30, 2026
RUSSELL INVESTMENT FUNDS, not summed
79,911
17.5
Russell Investments U.S. Small Cap Equity ETF
Fund S000089990 · Registered fund · Jun 30, 2026
Russell Investments Exchange Traded Funds, not summed
22,518
18
ACADIAN ASSET MANAGEMENT LLC
13F CIK 916542 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
1,376,048
19
ROYCE MICRO-CAP TRUST, INC.
Fund · Registered fund · Jun 30, 2026
ROYCE MICRO-CAP TRUST, INC., not summed
1,320,357
20
BANK OF AMERICA CORP /DE/
13F CIK 70858 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
1,315,332
21
VANGUARD EXTENDED MARKET INDEX FUND
Fund S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
1,300,320
22
VANGUARD PORTFOLIO MANAGEMENT LLC
13F CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,141,592
23
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F CIK 884546 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,073,253
23.1
Schwab U.S. Small-Cap ETF
Fund S000026636 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
529,904
23.2
Schwab Small-Cap Index Fund
Fund S000005912 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
295,805
23.3
Schwab U.S. Broad Market ETF
Fund S000026631 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
62,408
23.4
Schwab Total Stock Market Index Fund
Fund S000005913 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
55,000
24
NORTHERN TRUST CORP
13F CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
1,003,294
24.1
Small Cap Index Fund
Fund S000001245 · Registered fund · Jun 30, 2026
Northern Funds, not summed
62,771
25
HRT FINANCIAL LP
13F CIK 1475597 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
997,769
26
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP
13F CIK 1164508 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
973,833
27
WPG Partners Select Small Cap Value Fund
Fund S000074886 · Registered fund · May 31, 2026
RBB Fund, Inc., not summed
945,719
28
JANE STREET GROUP, LLC
13F CIK 1595888 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
906,162
29
TUDOR INVESTMENT CORP ET AL
13F CIK 923093 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
837,913
30
AQR CAPITAL MANAGEMENT LLC
13F CIK 1167557 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
813,971
31
VANGUARD FIDUCIARY TRUST CO
13F CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
740,662
32
CITADEL ADVISORS LLC
13F CIK 1423053 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
721,470
33
MORGAN STANLEY
13F CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
701,792
34
Qube Research & Technologies Ltd
13F CIK 1729829 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
689,821
35
SUSQUEHANNA INTERNATIONAL GROUP, LLP
13F CIK 1446194 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
681,705
36
D. E. Shaw & Co., Inc.
13F CIK 1009207 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
669,182
37
RENAISSANCE TECHNOLOGIES LLC
13F CIK 1037389 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
661,300
38
VANGUARD RUSSELL 2000 INDEX FUND
Fund S000030003 · Registered fund · May 31, 2026
VANGUARD SCOTTSDALE FUNDS, not summed
602,711
39
FMR LLC
13F CIK 315066 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
504,385
39.1
Fidelity Small Cap Index Fund
Fund S000033638 · Registered fund · Jul 31, 2026
Fidelity Salem Street Trust, not summed
1,329,842
39.2
Fidelity Extended Market Index Fund
Fund S000006021 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
567,467
39.3
Fidelity Enhanced Small Cap Core ETF
Fund S000081807 · Registered fund · Jun 30, 2026
Fidelity Covington Trust, not summed
493,884
39.4
Fidelity Total Market Index Fund
Fund S000006026 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
201,598
39.5
Fidelity Small Cap Value Index Fund
Fund S000065751 · Registered fund · Jun 30, 2026
Fidelity Salem Street Trust, not summed
169,715
40
MARSHALL WACE, LLP
13F CIK 1318757 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
441,704
41
Point72 Asset Management, L.P.
13F CIK 1603466 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
422,361
42
Jain Global LLC
13F CIK 2024579 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
411,465
43
VANGUARD S&P SMALL-CAP 600 INDEX FUND
Fund S000030017 · Registered fund · May 31, 2026
VANGUARD ADMIRAL FUNDS, not summed
383,093
44
Bank of New York Mellon Corp
13F CIK 1390777 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
371,427
45
VANGUARD HEALTH CARE INDEX FUND
Fund S000004450 · Registered fund · May 31, 2026
VANGUARD WORLD FUND, not summed
324,066
46
AMERICAN CENTURY COMPANIES INC
13F CIK 748054 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
292,103
47
Nuveen, LLC
13F CIK 1871926 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
289,415
47.1
Nuveen Small Cap Blend Index Fund
Fund S000005367 · Registered fund · Jul 31, 2026
TIAA-CREF Funds, not summed
162,092
47.2
Nuveen Equity Index Fund
Fund S000005360 · Registered fund · Jul 31, 2026
TIAA-CREF Funds, not summed
94,993
47.3
TIAA Separate Account VA-1 - Stock Index Account
Fund S000005098 · Registered fund · Jun 30, 2026
TIAA Separate Account VA-1, not summed
3,007
47.4
Nuveen Life Stock Index Fund
Fund S000005094 · Registered fund · Jun 30, 2026
TIAA-CREF Life Funds, not summed
1,861
48
Connor, Clark & Lunn Investment Management Ltd.
13F CIK 1596800 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
266,938
49
Avantis U.S. Small Cap Equity ETF
Fund S000074835 · Registered fund · May 31, 2026
American Century ETF Trust, not summed
255,865
50
JACOBS LEVY EQUITY MANAGEMENT, INC
13F CIK 884414 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
241,581

26 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 243 holders

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