SEC ownership of MAGNACHIP SEMICONDUCTOR Corp

Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001325702.

Comparable stake leader

Byreforge LLC

Disclosed value leader

TORO 18 HOLDINGS LLC

Comparable rows

50/50

Latest evidence

31 Mar 2026

Top shareholders Insider holders Latest transactions
Public ticker
MX on NYSE
Parsed ownership sources
13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
Largest SEC-reported holder
Byreforge LLC
Ranking: Comparable ownership first, then disclosed value
Ownership snapshot CIK-linked ownership evidence from parsed SEC filings. 3 signals
Comparable ownership rows
50 of 50
Meaning: Rows with safely comparable ownership %
Latest 13D/G holder
Byreforge LLC
Source: Latest parsed Schedule 13D/G stake
Latest parsed ownership date
31 Mar 2026
Freshness: Most recent filing date in this holder set
Issuer Names, identifiers, and filing context for this profile. 2 identity fields
Issuer CIK
0001325702
Issuer location
Cheongju Si

Ownership snapshot

Top shareholders of MAGNACHIP SEMICONDUCTOR Corp (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader
Byreforge LLC
Disclosed value leader
TORO 18 HOLDINGS LLC
Comparable rows
50/50
Latest evidence
31 Mar 2026
13D/G 13F 3/4/5 Lead comparable stake: 8.5% 13D/G row: Byreforge LLC Showing 1-8 of 50 holder rows.

Quick read

Byreforge LLC leads the comparable SEC ownership view at 8.5%.

50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens Byreforge LLC's linked filing trail.
Comparable ownership Top 5
Byreforge LLC 8.5%
TORO 18 HOLDINGS LLC 8%
IMMERSION CORP 4.1%
Clearline Capital LP 4.1%
Cristiano Amoruso 8.5%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-8 of 50 holder rows
Holder Evidence Ownership % Position 12M Net Δ As of
Byreforge LLC
13D/G
13D/G
8.5%
$7,835,586
3,072,779 shares
 $0 14 Jan 2026
TORO 18 HOLDINGS LLC
13D/G
13D/G
8%
$9,652,952
2,970,139 shares
 $0 23 Dec 2024
IMMERSION CORP
13D/G 13F
TORO 18 HOLDINGS LLC · Company
13D/G 13F
4.1%
$4,350,392
1,500,135 shares
 $0 20 Mar 2026
Clearline Capital LP
13D/G 13F
Company
13D/G 13F
4.1%
$3,725,642
1,461,036 shares
 -$1,119,807 31 Dec 2025
Cristiano Amoruso
3/4/5
Director
3/4/5
8.5%
$7,908,587
3,101,407 shares
 — 15 Feb 2026
Camillo Martino
3/4/5
Chairman and CEO, Director
3/4/5
1.1%
$1,193,602
404,611 shares
 +$85,290 01 Oct 2025
Gilbert E. Nathan
3/4/5
Director
3/4/5
1%
$1,086,452
376,456 shares
 +$167,974 16 Mar 2026
Ilbok Lee
3/4/5
Director
3/4/5
0.75%
$893,834
275,026 shares
 — 01 Jul 2025
How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Forms 3/4/5 flow

Insider trading overview

Net insider flow leans to buying over the last 12 months. Net value: +$281,944.

Buys
$281,944
Insiders: 3
Sells
$0
Insiders: 0
Net
+$281,944
Shares: +100,000
Window
Last 12 months
4 rolling buckets
Buy value Sell value
Shares: 100,000 Shares: 0
Window (months) Buy shares Sell shares Buy value Sell value Net value
0-3 0 0 $0 $0 $0
3-6 60,000 0 $167,974 $0 +$167,974
6-9 0 0 $0 $0 $0
9-12 40,000 0 $113,970 $0 +$113,970

Reporting owners

Insider holders from Forms 3/4/5

Showing 1-16 of 16 reporting-owner rows connected to MAGNACHIP SEMICONDUCTOR Corp. Open a relationship link for the CIK-to-CIK filing trail.

Rows
16
Largest Forms 3/4/5 holder
Cristiano Amoruso
Net 12M change
+$281,944
Latest report
01 Jul 2026
Name Relationship Holdings Value Past Year Net Change Change % Valuation Report Date
Cristiano Amoruso Director $7,908,587 Mixed 15 Feb 2026
Young-Joon Kim Director and Chief Executive Officer, Director $3,263,662 Mixed 01 Jun 2025
Theodore S. Kim Chief Compliance Officer, General Counsel and Secretary $1,555,914 Mixed 31 Dec 2024
Shinyoung Park Chief Financial Officer $1,295,521 +$28,680 +2.3% Mixed 01 Jun 2026
Camillo Martino Chairman and CEO, Director $1,193,602 +$85,290 +7.7% Mixed 01 Oct 2025
Gilbert E. Nathan Director $1,086,452 +$167,974 +18% Mixed 16 Mar 2026
Gary W. Tanner Director $982,568 Mixed 01 Jun 2023
Melvin L. Keating Director $933,338 Mixed 01 Jun 2023
Ilbok Lee Director $893,834 Mixed 01 Jul 2025
Woung Moo Lee General Manager of Mixed Signal Solutions $809,342 Mixed 01 Jun 2024
Chae Lee Chief Executive Officer, Director $808,500 Mixed 01 Jul 2026
Seunghoon Lee Chief of Manufacturing $488,232 Mixed 01 Jun 2026
Jinseok Yang Acting Co-General Manager of Mixed-Signal Solutions $321,169 Mixed 01 Mar 2025
Chan Ho Park General Manager of Power Analog Solutions $315,090 Mixed 31 Dec 2023
Kyo-Hwa Liz Chung Director $257,011 Mixed 15 Feb 2026
Young Soo Woo Officer $177,728 Mixed 31 Dec 2021

Recent insider transactions for MAGNACHIP SEMICONDUCTOR Corp

Showing up to 300 recent insider transactions from the last 12 months.

Insider Symbol Class Transaction % SEC-reported value SEC-reported price Shares Shares owned Date Ownership
Chae Lee MX Common Stock Award 288,750 288,750 01 Jul 2026 Direct
Chae Lee MX Stock Option (Right to Buy) Award 148,750 148,750 01 Jul 2026 Direct
Shin Young Park MX Common Stock Award 52.2% 112,500 327,954 01 Jun 2026 Direct
Seunghoon Lee MX Common Stock Award 23.4% 30,000 158,201 01 Jun 2026 Direct
Gilbert E. Nathan MX Common Stock Purchase 16.2% $63,050 $2.87 21,994 158,200 16 Mar 2026 By GT Investments II Corp
Gilbert E. Nathan MX Common Stock Purchase 10.6% $36,249 $2.79 13,006 136,206 13 Mar 2026 By GT Investments II Corp
Gilbert E. Nathan MX Common Stock Purchase 25.5% $68,675 $2.75 25,000 123,200 12 Mar 2026 By GT Investments II Corp
Gilbert E. Nathan MX Common Stock Award 0.69% 1,478 214,491 15 Feb 2026 Direct
Kyo-Hwa Liz Chung MX Common Stock Award 3.01% 2,946 100,789 15 Feb 2026 Direct
Cristiano Amoruso MX Common Stock Award 28,628 28,628 15 Feb 2026 Direct
Seunghoon Lee MX Common Stock Tax liability -10.9% -15,752 128,201 31 Dec 2025 Direct
Seunghoon Lee MX Common Stock Award 5.11% 7,000 143,953 31 Dec 2025 Direct
Shin Young Park MX Common Stock Tax liability -14.4% -36,332 215,454 31 Dec 2025 Direct
Kyo-Hwa Liz Chung MX Common Stock Award 3.34% 3,160 97,843 15 Nov 2025 Direct
Gilbert E. Nathan MX Common Stock Award 3.06% 6,320 213,013 15 Nov 2025 Direct
Camillo Martino MX Common Stock Award 40.7% 105,484 364,611 01 Oct 2025 Direct
Shin Young Park MX Common Stock Purchase 4.14% $28,680 $2.87 10,000 251,786 25 Aug 2025 Direct
Camillo Martino MX Common Stock Purchase 13.1% $85,290 $2.84 30,000 259,127 22 Aug 2025 Direct
Seunghoon Lee MX Common Stock Award 29% 30,750 136,953 15 Aug 2025 Direct
Seunghoon Lee MX Performance-Based Restricted Stock Units Award 15,375 15,375 15 Aug 2025 Direct
* marks a reported price that did not pass the local price check.
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