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

SCHEDULE 13G 

Under the Securities Exchange Act of 1934 

(Amendment No. )* 

Magnachip Semiconductor Corp. 
(Name of Issuer) 

Common Stock 
(Title of Class of Securities) 

55933J203 
(CUSIP Number) 

December 31, 2015 
(Date of Event Which Requires Filing of this Statement) 

Check the appropriate box to designate the rule pursuant to which this 
Schedule is filed: 
[X] Rule 13d-1(b) 
[ ] Rule 13d-1(c) 
[ ] Rule 13d-1(d) 

*The remainder of this cover page shall be filled out for a reporting 
person's initial filing on this form with respect to the subject class 
of securities, and for any subsequent amendment containing information 
which would alter the disclosures provided in a prior cover page. 

The information required in the remainder of this cover page shall not 
be deemed to be "filed" for the purpose of Section 18 of the Securities 
Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of 
that section of the Act but shall be subject to all other provisions of 
the Act (however, see the Notes). 

CUSIP: 55933J203                                                Page 1 of 5 

1   NAMES OF REPORTING PERSONS 
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) 
Capital World Investors ** 

2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE          
INSTRUCTIONS)                                                 (a)     

(b)     
3   SEC USE ONLY 

4   CITIZENSHIP OR PLACE OF ORGANIZATION 

Delaware 

5   SOLE VOTING POWER 

2,355,000 

6   SHARED VOTING POWER 
NUMBER OF         
SHARES         NONE 
BENEFICIALL        
Y OWNED BY 
7   SOLE DISPOSITIVE POWER 
EACH           
REPORTING        2,355,000 
PERSON 
WITH: 
8   SHARED DISPOSITIVE POWER 

NONE 

9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 

2,355,000          Beneficial ownership disclaimed pursuant to Rule 
13d-4   

10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES 
(SEE INSTRUCTIONS) 

11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 

6.8%   

12  TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) 

IA   

** A division of Capital Research and Management Company (CRMC)  

CUSIP: 55933J203                                                Page 2 of 5 

SECURITIES AND EXCHANGE COMMISSION 
Washington, DC 20549 

Schedule 13G 
Under the Securities Exchange Act of 1934 

Amendment No.  

Item 1(a)     Name of Issuer: 
Magnachip Semiconductor Corp. 

Item 1(b)     Address of Issuer's Principal Executive Offices: 
c/o Magnachip Semiconductor SA 
1, Allee Scheffer 
L-2520, Luxembourg 

Item 2(a)     Name of Person(s) Filing: 
Capital World Investors 

Item 2(b)     Address of Principal Business Office or, if none, 
Residence: 
333 South Hope Street 
Los Angeles, CA 90071 

Item 2(c)     Citizenship:   N/A 

Item 2(d)     Title of Class of Securities: 
Common Stock 

Item 2(e)     CUSIP Number: 
55933J203 

Item 3     If this statement is filed pursuant to sections 240.13d-1(b) 
or 240.13d-2(b) or (c), check whether the person filing is a:  
(e)      [X]     An investment adviser in accordance with 
section 240.13d-1(b)(1)(ii)(E). 

Item 4     Ownership 

Provide the following information regarding the aggregate 
number and percentage of the class of securities of the issuer 
identified in Item 1. 

(a)    Amount beneficially owned: 
(b)    Percent of class: 
(c)    Number of shares as to which the person has: 
(i)    Sole power to vote or to direct the vote: 
(ii)   Shared power to vote or to direct the vote: 
(iii)  Sole power to dispose or to direct the disposition of: 
(iv)   Shared power to dispose or to direct the disposition of: 

See page 2  

Capital World Investors is deemed to be the beneficial owner of 
2,355,000 shares or 6.8% of the 34,568,942 shares believed to 
be outstanding as a result of CRMC acting as investment adviser 
to various investment companies registered under Section 8 of 
the Investment Company Act of 1940. 

CUSIP: 55933J203                                                Page 3 of 5 

Item 5     Ownership of Five Percent or Less of a Class.  If this 
statement is being filed to report the fact that as of the date 
hereof the reporting person has ceased to be the beneficial 
owner of more than five percent of the class of securities, 
check the following: [ ] 

Item 6     Ownership of More than Five Percent on Behalf of Another 
Person: One or more clients of Capital World Investors have the 
right to receive or the power to direct the receipt of 
dividends from, or the proceeds from the sale of, the Common 
Stock of Magnachip Semiconductor Corp..  Capital World 
Investors holds more than five percent of the outstanding 
Common Stock of Magnachip Semiconductor Corp. as of December 
31, 2015 on behalf of each of the following client(s):   

SMALLCAP World Fund, Inc. 

Item 7     Identification and Classification of the Subsidiary Which 
Acquired the Security Being Reported on By the Parent Holding 
Company or Control Person: N/A 

Item 8     Identification and Classification of Members of the Group:  
N/A 

Item 9     Notice of Dissolution of Group:  N/A 

Item 10     Certification 

By signing below, I certify that, to the best of my knowledge 
and belief, the securities referred to above were acquired and 
are held in the ordinary course of business and were not 
acquired and are not held for the purpose of or with the effect 
of changing or influencing the control of the issuer of the 
securities and were not acquired and are not held in connection 
with or as a participant in any transaction having that purpose 
or effect. 

Signature 

After reasonable inquiry and to the best of my knowledge and 
belief, I certify that the information set forth in this 
statement is true, complete and correct. 

Date:          February 10, 2016 

Signature:     Alan Berro*** 
Name/Title:    Alan Berro - Senior Vice President 
Capital World Investors 

***By  /s/ Michael J. Triessl 
Michael J. Triessl 
Attorney-in-fact 

Signed pursuant to a Power of Attorney dated December 19, 
2014 included as an Exhibit to Schedule 13G filed with the 
Securities and Exchange Commission by Capital World Investors 
on February 6, 2015 with respect to Hudbay Minerals Inc. 
CUSIP: 55933J203                                                Page 4 of 5 

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