Cytek Biosciences CTKB Institutional Ownership

NASDAQ CTKB

$4.63 +0.01 (+0.11%)

As of: Sep 9, 2026 · 11:23 AM EDT

Institutions by Trading Activity

157 Institutions

Increased 76 48.4%

Unchanged 17 10.8%

Reduced 64 40.8%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

63.84%

▼-2.26 pp QoQ

Shares Held by Institutions

82.64Mn

of 129.46Mn outstanding

▲+1.98% QoQ

Shares Outstanding

129.46Mn

46.82Mn held outside 13F filers

Institutional Investors

157

filed 13F for Jun 2026

▼-8 vs prior quarter

Net Shares Added (QoQ)

+1.61Mn

accumulated since last quarter

Value of Holdings

$388.42Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 30 Jun, 2026

Cytek Biosciences, Inc. (NASDAQ:CTKB) appears in 157 institutional 13F filings for the quarter ending June 2026.

Collectively, these holders controlled 63.8% of Cytek Biosciences's outstanding shares in June 2026, down from 66.1% in March 2026.
They increased total shares held in Cytek Biosciences by 1.98% from last quarter, and the number of investors in CTKB stayed flat annually.
Activity in CTKB broke down as 76 buyers, 64 sellers, and 17 unchanged among 157 total holders.
Combined, these investors held 82.64Mn shares in CTKB for June 2026, up by 1.61Mn shares quarter on quarter, and up 1.92Mn shares year over year.
BlackRock, Inc. leads ownership in CTKB with 9.58Mn shares as of June 30, 2026, equal to 7.4% of outstanding shares.
The largest buyers of Cytek Biosciences for the quarter ending June 2026 were MILLENNIUM MANAGEMENT LLC (3.05Mn), Boston Partners (1.86Mn), Sixth Street Partners Management Company, L.P. (1.07Mn), ACADIAN ASSET MANAGEMENT LLC (977.06K), JANE STREET GROUP, LLC (906.16K).
Leading sellers of Cytek Biosciences shares for the quarter ending June 2026 were BlackRock, Inc. (7.43Mn), State Street Corp (1.56Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (1.17Mn), Morgan Stanley (1.02Mn), Topline Capital Management, LLC (781.03K).
Per Business Quant data, the top 10 holders of Cytek Biosciences for the quarter ending June 2026 are BlackRock, Inc. (9.58Mn), MILLENNIUM MANAGEMENT LLC (9.34Mn), Boston Partners (7.66Mn), HHLR ADVISORS, LTD. (6.66Mn), Topline Capital Management, LLC (6.28Mn), VANGUARD CAPITAL MANAGEMENT LLC (4.94Mn), GEODE CAPITAL MANAGEMENT, LLC (3.06Mn), DIMENSIONAL FUND ADVISORS LP (2.62Mn), State Street Corp (2.57Mn), Goldman Sachs Group Inc (2.17Mn).

Form 13F Holdings

157 Institutional Holders

Report period 30 Jun, 2026

Total shares held 82.64Mn

Of outstanding 63.84%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	BlackRock, Inc.	0002012383	9,578,643	7.40%	▼7,428,626	-43.68%	$42.43Mn
2	MILLENNIUM MANAGEMENT LLC	0001273087	9,338,010	7.21%	▲3,046,212	+48.42%	$41.37Mn
3	Boston Partners	0001386060	7,660,943	5.92%	▲1,858,170	+32.02%	$33.94Mn
4	HHLR ADVISORS, LTD.	0001762304	6,657,030	5.14%	0	0.00%	$29.49Mn
5	Topline Capital Management, LLC	0001792549	6,283,450	4.85%	▼781,031	-11.06%	$27.84Mn
6	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	4,939,597	3.82%	▲176,693	+3.71%	$21.88Mn
7	GEODE CAPITAL MANAGEMENT, LLC	0001214717	3,059,573	2.36%	▲225,618	+7.96%	$13.56Mn
8	DIMENSIONAL FUND ADVISORS LP	0000354204	2,616,257	2.02%	▼47,072	-1.77%	$11.59Mn
9	State Street Corp	0000093751	2,566,121	1.98%	▼1,557,627	-37.77%	$11.37Mn
10	Goldman Sachs Group Inc	0000886982	2,167,515	1.67%	▼177,220	-7.56%	$9.60Mn
11	ROYCE & ASSOCIATES LP	0000906304	2,081,579	1.61%	▲439,211	+26.74%	$9.22Mn
12	Russell Investments Group, Ltd.	0001692234	1,511,315	1.17%	▲151,415	+11.13%	$6.70Mn
13	ACADIAN ASSET MANAGEMENT LLC	0000916542	1,376,048	1.06%	▲977,060	+244.88%	$6.09K
14	Bank Of America Corp /De/	0000070858	1,315,332	1.02%	▲306,278	+30.35%	$5.83Mn
15	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	1,141,592	0.88%	▼1,170,266	-50.62%	$5.06Mn
16	Sixth Street Partners Management Company, L.P.	0001812095	1,073,253	0.83%	▲1,073,253	0.00%	$4.75Mn
16	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	0000884546	1,073,253	0.83%	▼31,348	-2.84%	$4.75Mn
17	Northern Trust Corp	0000073124	1,003,294	0.77%	▼1,899	-0.19%	$4.44Mn
18	HRT FINANCIAL LP	0001475597	997,769	0.77%	▲583,717	+140.98%	$4.42K
19	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	0001164508	973,833	0.75%	▲653,924	+204.41%	$4.31Mn

Showing 1 to 20 of 157 holders