Optiver Holding B.V.

Position in CTKB — Cytek Biosciences, Inc.

CIK 1859606 AMSTERDAM, P7

Position in CTKB

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$13,874

+$10,280 QoQ

Shares Held

3,175

+206.5% QoQ

Ownership

0.002%

of shares outstanding

% of Portfolio

0.00%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Sep 2025

2 quarters on record

Voting authority Sole 0.ToString("F0")% Shared 100.ToString("F0")% None 0.ToString("F0")%

Healthcare · as of Mar 31, 2026

Optiver Holding B.V. holds $1,582,210 across 40 Medical Devices names. CTKB ranks #7 (0.9% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	BSX	Boston Scientific Corp	13,575	$851,831
2	PHG	Koninklijke Philips NV	15,688	$429,851
3	ABT	Abbott Laboratories	870	$89,322
4	MDT	Medtronic plc	677	$58,662
5	NEOG	Neogen Corp	2,131	$19,796
6	IRTC	iRhythm Holdings, Inc.	162	$19,119
7	CTKB	Cytek Biosciences, Inc. This page	3,175	$13,874
8	HAE	Haemonetics Corp	160	$9,017

2 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$13,874	3,175	+206.5%	Shares	Defined	2026-05-15
2025-09-30	$3,594	1,036	—	Shares	Defined	2025-11-10
No filing history on record for this holder in this stock.