Cytek Biosciences, Inc.

CTKB

Exchange: Nasdaq
Industry: Laboratory Analytical Instruments
SEC CIK: 0001831915

SEC filings (opens in a new tab)

No open-market purchases or sales by Cytek Biosciences, Inc. insiders were filed in the last 90 days; 154 institutions reported holding it in 13F filings for Q2 2026, worth $361.0M in total; HHLR Advisors (Hillhouse) is the only superinvestor holding it.

Q1 2026 vs. Q4 2025

How the institutions holding Cytek Biosciences, Inc. changed between Q4 2025 and Q1 2026.

All holders in Q1 2026 All holders in Q4 2025

13F holders of CTKB: Q4 2025 compared with Q1 2026
Measure	Q4 2025	Of which not filed for Q1 2026	Q1 2026	Change
Holders	155	3	165	+13
Shares	82.0M	7.50M	85.1M	+10.5M (+14.1%)
Value	$414.3M	$37.9M	$371.8M	−$4.62M (−1.2%)

3 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so the changes leave them out.

New holders (24)

Institutions that held Cytek Biosciences, Inc. at the end of Q1 2026 but not at the end of Q4 2025.

Institutions new to CTKB in Q1 2026
Institution	Shares	Value	% of portfolio
Vanguard Capital Management LLC	4,762,904	$20.8M	0.00%
Vanguard Portfolio Management LLC	2,311,858	$10.1M	0.00%
CenterBook Partners LP	729,874	$3.19M	0.17%
Vanguard Fiduciary Trust Co	717,011	$3.13M	0.00%
Tudor Investment Corp Et Al	320,715	$1.40M	0.01%
Gsa Capital Partners LLP	109,116	$477.0K	0.03%
Illinois Municipal Retirement Fund	60,877	$266.0K	0.00%
Vanguard Global Advisers, LLC	45,212	$197.6K	0.00%
Algert Global LLC	42,560	$186.0K	0.00%
Canada Pension Plan Investment Board	41,300	$180.5K	0.00%
nVerses Capital, LLC	38,319	$167.5K	0.15%
Jump Financial, LLC	28,892	$126.3K	0.00%
Virtu Financial LLC	27,026	$118.0K	0.00%
Squarepoint Ops LLC	25,296	$110.5K	0.00%
Merit Financial Group, LLC	16,398	$71.7K	0.00%
AE Wealth Management LLC	14,193	$62.0K	0.00%
Xponance, Inc.	10,593	$46.3K	0.00%
Optiver Holding B.V.	3,175	$13.9K	0.00%
Clear Street Markets LLC	1,704	$7.45K	0.00%
Stone House Investment Management, LLC	318	$1.39K	0.00%
Wealth Preservation Advisors, LLC	109	$476	0.00%
MAI Capital Management	78	$341	0.00%
Root Financial Partners, LLC	42	$184	0.00%
SJS Investment Consulting Inc.	6	$27	0.00%

Sold out (11)

Institutions that held Cytek Biosciences, Inc. at the end of Q4 2025 and filed for Q1 2026 without it.

Institutions that sold out of CTKB in Q1 2026
Institution	Shares, Q4 2025	Value, Q4 2025
Wellington Management Group LLP	764,279	$3.86M
Point72 Asset Management, L.P.	114,256	$577.0K
Jane Street Group, LLC	78,758	$397.7K
Caxton Associates LLP	45,376	$229.1K
Quantbot Technologies LP	38,533	$194.6K
XTX Topco Ltd	34,565	$174.6K
Los Angeles Capital Management LLC	27,420	$104.7K
Aquatic Capital Management LLC	306	$1.54K
Smartleaf Asset Management LLC	127	$640
Clearstead Advisors, LLC	24	$122
Cedar Mountain Advisors, LLC	21	$106

Not filed for Q1 2026 yet (3)

Institutions that held Cytek Biosciences, Inc. at the end of Q4 2025 and haven't filed a 13F for Q1 2026. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding CTKB in Q4 2025 that haven't filed for Q1 2026
Institution	Shares, Q4 2025	Value, Q4 2025
Vanguard Group Inc	7,475,477	$37.8M
Comerica Bank	23,997	$121.2K
CIBC Private Wealth Group, LLC	26	$131