Cytek Biosciences, Inc. (CTKB) — Institutional Holders, Q2 2026

155 institutional investment managers reported a CTKB position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $361.1M. Every filer is listed below, ranked by position value, 100 per page; this page shows ranks 1 to 100. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.

← CTKB stock profile

CTKB in Q2 2026: what funds did

Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.

New positions

Added to

Trimmed

Sold out

Biggest buyers

MILLENNIUM MANAGEMENTAdded · +3,046,212 sh+$13.5M
Boston PartnersAdded · +1,858,170 sh+$8.2M
ACADIAN ASSET MANAGEMENTAdded · +977,060 sh+$4.3M
JANE STREET GROUPNew · +906,162 sh+$4.0M
Qube Research & Technologies LtdNew · +689,821 sh+$3.1M

Biggest sellers

BlackRockTrimmed · -7,428,626 sh-$32.9M
STATE STREETTrimmed · -1,557,627 sh-$6.9M
BROWN CAPITAL MANAGEMENTSold out · -1,480,506 sh-$6.6M
VANGUARD PORTFOLIO MANAGEMENTTrimmed · -1,170,266 sh-$5.2M
MORGAN STANLEYTrimmed · -1,017,083 sh-$4.5M

CTKB 13F holders ranked 1–100 of 155

Institutional investors reporting a position in Cytek Biosciences, Inc. on SEC Form 13F-HR for Q2 2026, ranked by reported value.
#	Institution	Shares	Value	% of portfolio	QoQShares vs Q1 2026
1	BlackRock#1 · 9,578,643 sh	9,578,643	$42.4M	<0.01%	-43.7%
2	MILLENNIUM MANAGEMENT#2 · 9,338,010 sh	9,338,010	$41.4M	0.01%	+48.4%
3	Boston Partners#3 · 7,660,943 sh	7,660,943	$33.9M	0.03%	+32.0%
4	Hillhouse Capital Advisors, Ltd.#4 · 6,657,030 sh	6,657,030	$29.5M	3.54%	0.0%
5	Topline Capital Management#5 · 6,283,450 sh	6,283,450	$27.8M	7.22%	-11.1%
6	VANGUARD CAPITAL MANAGEMENT#6 · 4,939,597 sh	4,939,597	$21.9M	<0.01%	+3.7%
7	GEODE CAPITAL MANAGEMENT#7 · 3,059,573 sh	3,059,573	$13.6M	<0.01%	+8.0%
8	DIMENSIONAL FUND ADVISORS#8 · 2,616,257 sh	2,616,257	$11.6M	<0.01%	-1.8%
9	STATE STREET#9 · 2,566,121 sh	2,566,121	$11.4M	<0.01%	-37.8%
10	GOLDMAN SACHS GROUP#10 · 2,167,515 sh	2,167,515	$9.6M	<0.01%	-7.6%
11	ROYCE & ASSOCIATES#11 · 2,081,579 sh	2,081,579	$9.2M	0.07%	+26.7%
12	Russell Investments Group, Ltd.#12 · 1,511,315 sh	1,511,315	$6.7M	<0.01%	+11.1%
13	ACADIAN ASSET MANAGEMENT#13 · 1,376,048 sh	1,376,048	$6.1M	<0.01%	+244.9%
14	BANK OF AMERICA#14 · 1,315,332 sh	1,315,332	$5.8M	<0.01%	+30.4%
15	VANGUARD PORTFOLIO MANAGEMENT#15 · 1,141,592 sh	1,141,592	$5.1M	<0.01%	-50.6%
16	CHARLES SCHWAB INVESTMENT MANAGEMENT#16 · 1,073,253 sh	1,073,253	$4.8M	<0.01%	-2.8%
17	NORTHERN#17 · 1,003,294 sh	1,003,294	$4.4M	<0.01%	-0.2%
18	HRT FINANCIAL#18 · 997,769 sh	997,769	$4.4M	0.01%	+141.0%
19	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP#19 · 973,833 sh	973,833	$4.3M	<0.01%	+204.4%
20	JANE STREET GROUP#20 · 906,162 sh	906,162	$4.0M	<0.01%	New
21	TUDOR INVESTMENT ET AL#21 · 837,913 sh	837,913	$3.7M	<0.01%	+161.3%
22	AQR CAPITAL MANAGEMENT#22 · 813,971 sh	813,971	$3.6M	<0.01%	-10.8%
23	VANGUARD FIDUCIARY#23 · 740,662 sh	740,662	$3.3M	<0.01%	+3.3%
24	CITADEL ADVISORS#24 · 721,470 sh	721,470	$3.2M	<0.01%	+53.1%
25	MORGAN STANLEY#25 · 701,792 sh	701,792	$3.1M	<0.01%	-59.2%
26	Qube Research & Technologies Ltd#26 · 689,821 sh	689,821	$3.1M	<0.01%	New
27	SUSQUEHANNA INTERNATIONAL GROUP, LLP#27 · 681,705 sh	681,705	$3.0M	<0.01%	+1117.1%
28	D. E. Shaw#28 · 669,182 sh	669,182	$3.0M	<0.01%	+157.3%
29	RENAISSANCE TECHNOLOGIES#29 · 661,300 sh	661,300	$2.9M	<0.01%	-2.3%
30	FMR#30 · 504,385 sh	504,385	$2.2M	<0.01%	+78.0%
31	MARSHALL WACE, LLP#31 · 441,704 sh	441,704	$2.0M	<0.01%	New
32	Point72 Asset Management, L.P.#32 · 422,361 sh	422,361	$1.9M	<0.01%	New
33	Jain Global#33 · 411,465 sh	411,465	$1.8M	<0.01%	New
34	Bank of New York Mellon#34 · 371,427 sh	371,427	$1.6M	<0.01%	-39.0%
35	AMERICAN CENTURY COMPANIES#35 · 292,103 sh	292,103	$1.3M	<0.01%	+3.7%
36	Nuveen#36 · 289,415 sh	289,415	$1.3M	<0.01%	+17.9%
37	Connor, Clark & Lunn Investment Management Ltd.#37 · 266,938 sh	266,938	$1.2M	<0.01%	+10.5%
38	JACOBS LEVY EQUITY MANAGEMENT#38 · 241,581 sh	241,581	$1.1M	<0.01%	-6.1%
39	BNP PARIBAS FINANCIAL MARKETS#39 · 215,010 sh	215,010	$952.5K	<0.01%	+175.5%
40	Y-Intercept (Hong Kong) Ltd#40 · 193,128 sh	193,128	$855.6K	—	New
41	Invesco Ltd.#41 · 185,671 sh	185,671	$822.5K	<0.01%	-52.2%
42	TWO SIGMA INVESTMENTS#42 · 168,218 sh	168,218	$745.2K	<0.01%	+557.1%
43	GSA CAPITAL PARTNERS LLP#43 · 167,593 sh	167,593	$742.0K	0.05%	+53.6%
44	Numerai GP#44 · 159,465 sh	159,465	$706.4K	0.06%	+41.8%
45	FRANKLIN RESOURCES#45 · 156,061 sh	156,061	$691.4K	<0.01%	+36.9%
46	RHUMBLINE ADVISERS#46 · 153,225 sh	153,225	$678.8K	<0.01%	-39.8%
47	CenterBook Partners#47 · 149,180 sh	149,180	$660.9K	0.03%	-79.6%
48	Jump Financial#48 · 148,083 sh	148,083	$656.0K	<0.01%	+412.5%
49	XTX Topco Ltd#49 · 142,723 sh	142,723	$632.3K	<0.01%	New
50	ALLIANCEBERNSTEIN L.P.#50 · 141,048 sh	141,048	$616.4K	<0.01%	0.0%
51	JPMORGAN CHASE#51 · 141,864 sh	141,864	$615.7K	0.00%	-52.6%
52	DEUTSCHE BANK AG\#52 · 111,932 sh	111,932	$495.9K	<0.01%	+7.2%
53	WELLS FARGO & COMPANY#53 · 102,704 sh	102,704	$455.0K	<0.01%	+126.8%
54	PRICE T ROWE ASSOCIATES#54 · 101,198 sh	101,198	$449.0K	0.00%	+26.3%
55	IEQ CAPITAL#55 · 90,100 sh	90,100	$399.1K	<0.01%	-37.6%
56	UBS Group AG#56 · 88,914 sh	88,914	$393.9K	<0.01%	-52.4%
57	PDT Partners#57 · 86,869 sh	86,869	$384.8K	0.02%	0.0%
58	Squarepoint Ops#58 · 82,776 sh	82,776	$366.7K	<0.01%	+227.2%
59	Aquatic Capital Management#59 · 76,762 sh	76,762	$340.1K	0.01%	New
60	VOYA INVESTMENT MANAGEMENT#60 · 74,034 sh	74,034	$328.0K	<0.01%	-47.6%
61	MetLife Investment Management#61 · 68,692 sh	68,692	$304.3K	<0.01%	+6.5%
62	Creative Planning#62 · 62,555 sh	62,555	$277.1K	<0.01%	-30.4%
63	Catalyst Funds Management Pty Ltd#63 · 62,500 sh	62,500	$276.9K	0.02%	New
64	LOS ANGELES CAPITAL MANAGEMENT#64 · 62,160 sh	62,160	$275.4K	<0.01%	New
65	Quantinno Capital Management#65 · 56,823 sh	56,823	$251.7K	<0.01%	+11.0%
66	CITIGROUP#66 · 56,130 sh	56,130	$248.7K	<0.01%	+350.7%
67	MIRAE ASSET GLOBAL ETFS Ltd.#67 · 56,017 sh	56,017	$248.2K	<0.01%	+1.6%
68	BALYASNY ASSET MANAGEMENT L.P.#68 · 54,381 sh	54,381	$240.9K	<0.01%	New
69	WEALTH ENHANCEMENT ADVISORY SERVICES#69 · 61,873 sh	61,873	$221.9K	—	-14.9%
70	PRELUDE CAPITAL MANAGEMENT#70 · 45,259 sh	45,259	$200.5K	0.01%	+242.9%
71	Vanguard Global Advisers#71 · 45,212 sh	45,212	$200.3K	<0.01%	0.0%
72	CANADA PENSION PLAN INVESTMENT BOARD#72 · 41,300 sh	41,300	$183.0K	<0.01%	0.0%
73	Police & Firemen's Retirement System of New Jersey#73 · 39,936 sh	39,936	$176.9K	<0.01%	+35.5%
74	Campbell & Investment Adviser#74 · 39,333 sh	39,333	$174.2K	<0.01%	New
75	ExodusPoint Capital Management#75 · 36,140 sh	36,140	$160.1K	<0.01%	New
76	R Squared Ltd#76 · 35,412 sh	35,412	$156.9K	0.08%	New
77	NEW YORK STATE COMMON RETIREMENT FUND#77 · 34,922 sh	34,922	$154.7K	<0.01%	0.0%
78	STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM#78 · 34,670 sh	34,670	$153.6K	<0.01%	0.0%
79	MANUFACTURERS LIFE INSURANCE COMPANY, THE#79 · 33,965 sh	33,965	$150.5K	<0.01%	+5.5%
80	STRS OHIO#80 · 32,000 sh	32,000	$141.8K	<0.01%	+22.1%
81	Cerity Partners#81 · 29,053 sh	29,053	$128.7K	<0.01%	-50.0%
82	AXQ CAPITAL#82 · 28,299 sh	28,299	$125.4K	0.01%	+43.6%
83	Focus Partners Wealth#83 · 28,205 sh	28,205	$124.9K	<0.01%	-16.2%
84	MERCER GLOBAL ADVISORS#84 · 25,718 sh	25,718	$113.9K	<0.01%	-11.7%
85	INTECH INVESTMENT MANAGEMENT#85 · 25,633 sh	25,633	$113.6K	<0.01%	0.0%
86	SRS Capital Advisors#86 · 23,786 sh	23,786	$105.4K	<0.01%	New
87	PRUDENTIAL FINANCIAL#87 · 23,260 sh	23,260	$103.0K	<0.01%	-80.2%
88	EntryPoint Capital#88 · 22,871 sh	22,871	$101.3K	0.02%	New
89	Laurion Capital Management#89 · 22,263 sh	22,263	$98.6K	<0.01%	New
90	Quadrature Capital Ltd#90 · 21,420 sh	21,420	$94.9K	<0.01%	New
91	BAILARD#91 · 19,900 sh	19,900	$88.2K	—	0.0%
92	State of Tennessee, Treasury Department#92 · 19,809 sh	19,809	$87.8K	<0.01%	-13.5%
93	BARCLAYS PLC#93 · 19,606 sh	19,606	$86.9K	0.00%	-18.8%
94	HSBC PLC#94 · 19,734 sh	19,734	$85.7K	0.00%	New
95	ProShare Advisors#95 · 15,925 sh	15,925	$70.5K	<0.01%	-12.6%
96	Tower Research Capital (TRC)#96 · 15,594 sh	15,594	$69.1K	<0.01%	+52.3%
97	ALGERT GLOBAL#97 · 14,895 sh	14,895	$66.0K	<0.01%	-65.0%
98	NorthCrest Asset Manangement#98 · 13,923 sh	13,923	$63.9K	—	-8.5%
99	AMERIPRISE FINANCIAL#99 · 14,126 sh	14,126	$62.6K	0.00%	-92.5%
100	AIGEN INVESTMENT MANAGEMENT#100 · 14,029 sh	14,029	$62.1K	0.02%	New

Funds that sold out of CTKB in Q2 2026 (38)

Held CTKB at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.

Institutions that held CTKB in Q1 2026 and reported no position in Q2 2026.
Institution	Shares sold	Value in Q1 2026
BROWN CAPITAL MANAGEMENT1,480,506 sh	1,480,506	$6.5M
Simcoe Capital882,113 sh	882,113	$3.9M
PRINCIPAL FINANCIAL GROUP534,759 sh	534,759	$2.3M
PUBLIC SECTOR PENSION INVESTMENT BOARD394,718 sh	394,718	$1.7M
STATE OF WISCONSIN INVESTMENT BOARD104,046 sh	104,046	$454.7K
THRIVENT FINANCIAL FOR LUTHERANS73,399 sh	73,399	$321.0K
Illinois Municipal Retirement Fund60,877 sh	60,877	$266.0K
PANAGORA ASSET MANAGEMENT51,593 sh	51,593	$225.5K
Louisiana State Employees Retirement System48,800 sh	48,800	$213.3K
NEW YORK STATE TEACHERS RETIREMENT SYSTEM44,829 sh	44,829	$196.0K
nVerses Capital38,319 sh	38,319	$167.5K
AMALGAMATED BANK31,901 sh	31,901	$139.0K
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS27,193 sh	27,193	$118.8K
YOUSIF CAPITAL MANAGEMENT27,078 sh	27,078	$118.3K
Virtu Financial27,026 sh	27,026	$118.0K
OREGON PUBLIC EMPLOYEES RETIREMENT FUND25,175 sh	25,175	$110.0K
TEACHERS RETIREMENT SYSTEM OF THE STATE OF KENTUCKY24,338 sh	24,338	$107.0K
Vanguard Personalized Indexing Management19,066 sh	19,066	$83.3K
Mariner17,807 sh	17,807	$77.8K
Merit Financial Group16,398 sh	16,398	$71.7K
Maryland State Retirement & Pension System15,656 sh	15,656	$68.4K
Dynamic Technology Lab Private Ltd14,778 sh	14,778	$64.6K
MUTUAL OF AMERICA CAPITAL MANAGEMENT12,584 sh	12,584	$55.0K
State of Wyoming12,253 sh	12,253	$53.5K
Neuberger Berman Group11,229 sh	11,229	$49.1K
M&T BANK10,308 sh	10,308	$45.0K
Pinnacle Wealth Planning Services4,313 sh	4,313	$18.8K
SIMPLEX TRADING3,226 sh	3,226	$14.1K
Optiver Holding B.V.3,175 sh	3,175	$13.9K
SUMMIT SECURITIES GROUP1,704 sh	1,704	$7.4K
Stone House Investment Management318 sh	318	$1.4K
Wealth Preservation Advisors109 sh	109	$476.00
Keating Financial Advisory Services86 sh	86	$376.00
MAI Capital Management78 sh	78	$341.00
Parkside Financial Bank66 sh	66	$289.00
Ankerstar Wealth60 sh	60	$262.00
Root Financial Partners42 sh	42	$184.00
SJS Investment Consulting6 sh	6	$27.00

Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.