SIMPLEX TRADING, LLC

Position in AMKR — Amkor Technology, Inc.

CIK 1488542 CHICAGO, IL

Position in AMKR

as of Jun 30, 2026 · filed Aug 12, 2026 Compact

Position Value

$4,229,667

+$3,899,915 QoQ

Shares Held

49,051

+322.5% QoQ

Ownership

0.020%

of shares outstanding

% of Portfolio

0.14%

of 13F equity value

Holder Rank

#163

of 642 holders

Holding Since

Mar 2020

13 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Technology · as of Jun 30, 2026

SIMPLEX TRADING, LLC holds $115,572,420 across 22 Semiconductor Equipment & Materials names. AMKR ranks #5 (3.7% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	KLAC	Kla Corp	123,044	$37,123,605
2	ASML	Asml Holding NV	16,406	$32,638,750
3	AMAT	Applied Materials Inc /De	32,303	$23,355,069
4	ACMR	ACM Research, Inc.	44,316	$5,623,257
5	AMKR	Amkor Technology, Inc. This page	49,051	$4,229,667
6	ENTG	Entegris Inc	13,273	$2,387,281
7	TER	Teradyne, Inc	3,406	$1,647,959
8	VECO	Veeco Instruments Inc	20,077	$1,521,836

13 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$4,229,667	49,051	+322.5%	Shares	Sole	2026-08-12
2025-09-30	$329,752	11,611	-14.3%	Shares	Sole	2025-11-12
2025-06-30	$284,498	13,554	-51.5%	Shares	Sole	2025-08-05
2024-12-31	$718,446	27,966	-8.9%	Shares	Sole	2025-02-11
2024-06-30	$1,228,774	30,704	+138.3%	Shares	Sole	2024-07-25
2024-03-31	$415,444	12,886	-68.9%	Shares	Sole	2024-04-25
2023-12-31	$1,377,544	41,405	+219.5%	Shares	Sole	2024-02-02
2023-03-31	$337,219	12,960	+389.1%	Shares	Sole	2023-04-27
2022-12-31	$63,547	2,650	+51.9%	Shares	Sole	2023-02-02
2022-06-30	$29,560	1,744	-85.5%	Shares	Sole	2022-08-03
2020-12-31	$181,970	12,067	-22.7%	Shares	Sole	2021-02-02
2020-09-30	$174,798	15,607	+598.3%	Shares	Sole	2020-10-14
2020-03-31	$17,410	2,235	—	Shares	Sole	2020-04-29
No filing history on record for this holder in this stock.