Cytek Biosciences, Inc. (CTKB) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

127,547,859Shares Outstanding

83,764,012Shares held by institutions

$387,827,376Value of institutional holdings

65.67%Institutional ownership %

5.34%Shares Changed QoQ

151No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Cytek Biosciences, Inc. (NASDAQ:CTKB) showed up in the 13F filings of 151 institutional investors as of December 2025.

They owned 64.3% of outstanding stock in December 2025, up from 63.3% the prior quarter.
They increased total shares held in Cytek Biosciences by 3.57% from the prior quarter, while the number of investors in CTKB decreased 0.66% year over year.
Among the 151 funds, 72 bought more Cytek Biosciences shares, 60 sold down, and 19 held their ground.
Institutional investors collectively held 81.97Mn shares in Cytek Biosciences as of December 2025, up by 2.82Mn shares quarter on quarter, and up 794.16K shares year over year.
As of December 31, 2025, BlackRock, Inc. held the largest stake in Cytek Biosciences with 17.17Mn shares, accounting for 13.46% of total shares outstanding.
The most significant purchases of CTKB for the quarter ending December 2025 came from Boston Partners (4.97Mn), Goldman Sachs Group Inc (1.84Mn), MILLENNIUM MANAGEMENT LLC (1.33Mn), Russell Investments Group, Ltd. (841.61K), BlackRock, Inc. (625.34K).
The largest sellers of Cytek Biosciences for the quarter ending December 2025 were BROWN CAPITAL MANAGEMENT LLC (2.89Mn), WELLINGTON MANAGEMENT GROUP LLP (1.78Mn), DIMENSIONAL FUND ADVISORS LP (570.9K), JACOBS LEVY EQUITY MANAGEMENT, INC (560.26K), Jpmorgan Chase & Co (388.59K).
Per Business Quant, the top 10 investors in CTKB for the quarter ending December 2025 include BlackRock, Inc. (17.17Mn), VANGUARD GROUP INC (7.48Mn), Topline Capital Management, LLC (7.44Mn), HHLR ADVISORS, LTD. (6.66Mn), Boston Partners (5.01Mn), MILLENNIUM MANAGEMENT LLC (4.75Mn), State Street Corp (4.15Mn), Goldman Sachs Group Inc (3.58Mn), GEODE CAPITAL MANAGEMENT, LLC (2.79Mn), DIMENSIONAL FUND ADVISORS LP (2.65Mn).

151 Institutional Holders

83,764,012 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
BlackRock, Inc.	31 Dec, 2025	17,173,028	625,335	3.78%	$86,723,792.00
VANGUARD GROUP INC	31 Dec, 2025	7,475,477	541,973	7.82%	$37,751,160.00
Topline Capital Management, LLC	31 Dec, 2025	7,442,466	498,186	7.17%	$37,584,453.00
HHLR ADVISORS, LTD.	31 Dec, 2025	6,657,030	0	0.00%	$33,618,002.00
Boston Partners	31 Dec, 2025	5,008,309	4,971,126	13,369.35%	$25,297,227.00
MILLENNIUM MANAGEMENT LLC	31 Dec, 2025	4,752,447	1,334,065	39.03%	$23,999,857.00
State Street Corp	31 Dec, 2025	4,146,964	62,596	1.53%	$20,942,168.00
Goldman Sachs Group Inc	31 Dec, 2025	3,579,828	1,842,519	106.06%	$18,078,132.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	2,790,574	7,125	0.26%	$14,095,696.00
DIMENSIONAL FUND ADVISORS LP	31 Dec, 2025	2,646,891	-570,897	-17.74%	$13,366,732.00
BROWN CAPITAL MANAGEMENT LLC	31 Dec, 2025	2,072,915	-2,885,101	-58.19%	$10,468,221.00
Morgan Stanley	31 Dec, 2025	1,700,985	237,844	16.26%	$8,589,975.00
ROYCE & ASSOCIATES LP	31 Dec, 2025	1,692,657	-70,605	-4.00%	$8,547,918.00
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	31 Dec, 2025	1,094,539	-10,482	-0.95%	$5,527,422.00
Russell Investments Group, Ltd.	31 Dec, 2025	1,001,127	841,614	527.61%	$5,055,684.00
Northern Trust Corp	31 Dec, 2025	957,594	-55,989	-5.52%	$4,835,850.00
Bank Of America Corp /De/	31 Dec, 2025	856,161	515,841	151.58%	$4,323,612.00
WELLINGTON MANAGEMENT GROUP LLP	31 Dec, 2025	764,279	-1,776,767	-69.92%	$3,859,609.00
AQR CAPITAL MANAGEMENT LLC	31 Dec, 2025	743,455	-276,435	-27.10%	$3,754,447.00
RENAISSANCE TECHNOLOGIES LLC	31 Dec, 2025	675,000	-120,544	-15.15%	$3,408,750.00

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