MASSACHUSETTS FINANCIAL SERVICES CO /MA/

Position in AMKR — Amkor Technology, Inc.

CIK 912938 Boston, MA

Back to AMKR Full portfolio

Position in AMKR

as of Mar 31, 2026 · filed May 14, 2026 Compact

Position Value

$16,516,688

+$1,421,866 QoQ

Shares Held

366,793

-4.1% QoQ

Ownership

0.148%

of shares outstanding

% of Portfolio

0.01%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

25 quarters on record

Voting authority Sole 94.10975672927236.ToString("F0")% Shared 5.890243270727631.ToString("F0")% None 0.ToString("F0")%

Common Shares in AMKR Over Time

Shares Held

Position Value (USD)

Position in Semiconductor Equipment & Materials

Technology · as of Mar 31, 2026

MASSACHUSETTS FINANCIAL SERVICES CO /MA/ holds $3,949,309,798 across 10 Semiconductor Equipment & Materials names. AMKR ranks #8 (0.4% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	KLAC	Kla Corp	1,641,635	$2,417,159,788
2	LRCX	Lam Research Corp	3,309,521	$707,112,253
3	AMAT	Applied Materials Inc /De	1,181,838	$403,940,407
4	ENTG	Entegris Inc	1,381,668	$161,986,755
5	Q	Qnity Electronics, Inc.	876,617	$101,144,068
6	FORM	Formfactor Inc	733,338	$71,126,451
7	TER	Teradyne, Inc	201,282	$59,672,060
8	AMKR	Amkor Technology, Inc. This page	366,793	$16,516,688

All Filings in AMKR

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25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$16,516,688	366,793	-4.1%	Shares	Defined	2026-05-14
2025-12-31	$15,094,822	382,341	-0.6%	Shares	Sole	2026-01-22
2025-09-30	$10,924,656	384,671	+21.3%	Shares	Sole	2025-10-29
2025-06-30	$6,655,782	317,093	+28.5%	Shares	Sole	2025-08-08
2025-03-31	$4,455,167	246,687	+34.7%	Shares	Sole	2025-05-02
2024-12-31	$4,703,119	183,072	+13.7%	Shares	Sole	2025-02-12
2024-09-30	$4,926,324	160,991	+5.6%	Shares	Sole	2024-11-12
2024-06-30	$6,098,767	152,393	+10.1%	Shares	Sole	2024-08-09
2024-03-31	$4,461,403	138,381	+2.2%	Shares	Sole	2024-05-14
2023-12-31	$4,506,388	135,449	+1.6%	Shares	Sole	2024-02-08
2023-09-30	$3,012,037	133,276	+0.6%	Shares	Sole	2023-11-08
2023-06-30	$3,939,703	132,427	+5.1%	Shares	Sole	2023-08-09
2023-03-31	$3,278,780	126,010	-1.9%	Shares	Sole	2023-05-10
2022-12-31	$3,080,159	128,447	-50.2%	Shares	Sole	2023-02-13
2022-09-30	$4,401,440	258,149	+9.5%	Shares	Sole	2022-11-09
2022-06-30	$3,996,877	235,804	+34.0%	Shares	Sole	2022-08-09
2022-03-31	$3,823,241	176,024	+1.8%	Shares	Sole	2022-05-11
2021-12-31	$4,285,100	172,856	-1.9%	Shares	Sole	2022-02-10
2021-09-30	$4,396,589	176,216	-21.7%	Shares	Sole	2021-11-10
2021-06-30	$5,326,436	225,029	-1.0%	Shares	Sole	2021-08-13
2021-03-31	$5,390,397	227,347	-16.2%	Shares	Sole	2021-05-13
2020-12-31	$4,091,400	271,313	-1.0%	Shares	Sole	2021-05-12
2020-09-30	$3,069,046	274,022	-3.8%	Shares	Sole	2020-11-12
2020-06-30	$3,505,407	284,761	-17.3%	Shares	Sole	2020-11-20
2020-03-31	$2,683,522	344,483	—	Shares	Sole	2020-11-20
No filing history on record for this holder in this stock.