Director-linked entity boosts Magnachip (NYSE: MX) stake with share buy

Rhea-AI Filing Summary

Magnachip Semiconductor director Nathan E. Gilbert reported an open-market purchase of 21,994 shares of Common Stock on behalf of GT Investments II Corp at $2.8667 per share. After this buy, GT Investments II Corp holds 158,200 shares indirectly, while Gilbert also holds 214,491 shares directly and additional smaller indirect positions through his spouse and children.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

NATHAN GILBERT E

(Last) (First) (Middle)

C/O MAGNACHIP SEMICONDUCTOR, LTD.

108, YEOUI-DAERO, YEONGDEUNGPO-GU

(Street)

SEOUL M5 07335

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
MAGNACHIP SEMICONDUCTOR Corp [ MX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
03/16/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/16/2026		P		21,994	A	$2.8667	158,200	I	By GT Investments II Corp
Common Stock								214,491	D
Common Stock								1,905	I	By Spouse
Common Stock								1,690	I	By Child
Common Stock								1,675	I	By Child
Common Stock								1,860	I	By Child

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

	/s/ Shinyoung Park, Attorney-in-Fact	03/17/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transaction did MAGNACHIP SEMICONDUCTOR (MX) report?

MAGNACHIP SEMICONDUCTOR reported that an entity associated with director Nathan E. Gilbert bought 21,994 Common Stock shares. The open-market purchase was made at $2.8667 per share, reflecting a net increase in his reported indirect holdings through GT Investments II Corp.

At what price were the MAGNACHIP SEMICONDUCTOR (MX) shares purchased?

The reported open-market purchase was executed at $2.8667 per share. This price applies to the entire 21,994-share transaction carried out indirectly through GT Investments II Corp, as disclosed for director Nathan E. Gilbert in the Form 4 filing.

How many MAGNACHIP SEMICONDUCTOR (MX) shares does GT Investments II Corp now hold?

Following the transaction, GT Investments II Corp holds 158,200 MAGNACHIP SEMICONDUCTOR Common Stock shares. These shares are reported as indirect ownership for director Nathan E. Gilbert, reflecting the updated position after the 21,994-share open-market purchase on March 16, 2026.

What are Nathan E. Gilbert’s direct MAGNACHIP SEMICONDUCTOR (MX) holdings after the filing?

After the reported transactions, Nathan E. Gilbert directly holds 214,491 MAGNACHIP SEMICONDUCTOR Common Stock shares. This direct position is separate from his indirect holdings through GT Investments II Corp and family accounts, which are disclosed as additional ownership lines in the same Form 4.

How are family-related MAGNACHIP SEMICONDUCTOR (MX) holdings reported for Nathan E. Gilbert?

The filing shows additional indirect holdings for Nathan E. Gilbert through his spouse and children. Reported positions total 1,905 shares by his spouse and 1,690, 1,675, and 1,860 shares by children, each listed as separate indirect ownership entries of MAGNACHIP SEMICONDUCTOR Common Stock.

Was the MAGNACHIP SEMICONDUCTOR (MX) Form 4 mainly a buy or sell transaction?

The Form 4 reflects a net-buy transaction, with one open-market purchase of 21,994 shares and no reported sales. Other lines in the filing update direct and indirect holdings only, without indicating additional buy or sell activity for MAGNACHIP SEMICONDUCTOR stock.