CTKB · Cytek Biosciences, Inc. · Shareholders & Ownership
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 | As of | Notes |
|---|---|---|---|---|
| 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 |
|
5,561,029 | ||
| 6.1 |
|
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 |
|
4,821,870 | ||
| 9.1 |
|
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 |
|
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 |
|
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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