Document:

EX-4.20

 Exhibit 4.20 

(Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The Supplemental Agreement for AGREEMENT FOR 

SINO-FOREIGN EQUITY JOINT VENTURE 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The Supplemental Agreement for 

AGREEMENT FOR SINO-FOREIGN EQUITY JOINT VENTURE 

WHEREAS, Tibet Unigroup GuoWei Investment Co., Ltd., ChipMOS TECHNOLOGIES (BVI) LTD., Gongqingcheng Changhou Investment Management Ltd. (“Changhou
Capital”), Accretech (China) Co Ltd., Chao-Jung Tsai, Shih-Jye Cheng, Shanghai Zuzhu Business Consulting Partnership (Limited Partnership), Shou-Kang Chen, and David W. Wang made and executed the
“AGREEMENT FOR SINO-FOREIGN EQUITY JOINT VENTURE” (hereinafter referred to as “JV Agreement”) on November 30, 2016 for the matter of joint venture of ChipMOS TECHNOLOGIES (Shanghai) LTD. (“ChipMOS
Shanghai”); 
 WHEREAS, Changhou Capital has entered into the “Equity Interest Transfer Agreement” with its Related Party, Gongqingcheng
Changhou Hong Xin Investment Management Partnership (Limited Partnership) (“Hong Xin Capital”), transferring of all of its equity interests in ChipMOS Shanghai to Hong Xin Capital (the registered capital in the amount of
RMB49,376,805), and Changhou Capital has presented its “Letter of Declaration and Undertaking” in accordance with the JV Agreement (as Attachment 1); 

WHEREAS, Hong Xin Capital fully understands the contents of the JV Agreement and agrees to assume Changhou Capital’s rights and obligations under the JV
Agreement; 
 NOW, THEREFORE, in consideration of the mutual premises contained herein, the Tibet Unigroup GuoWei Investment Co., Ltd., ChipMOS TECHNOLOGIES
(BVI) LTD., Accretech (China) Co Ltd., Chao-Jung Tsai, Shih-Jye Cheng, Shanghai Zuzhu Business Consulting Partnership (Limited Partnership), Shou-Kang Chen, David W. Wang, and Hong Xin Capital hereto agree to
this supplemental agreement for the JV Agreement (“this Agreement”) through good faith negotiations on April 10, 2017 as follows: 

Article 1. The Transfer of Rights and Obligations under the JV Agreement 
  

	1.1	 Hong Xin Capital, a limited partnership duly organized and existing under the laws of the People’s
Republic of China, with its registered office at 406-58 Gongqingcheng, Private Equity Park, Jiujiang City, Jiangxi Province. Its legal representative on the execution date of this Agreement being Changhou
Capital (representative: Hong-Wei Hsieh). 

  
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 (Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The Supplemental Agreement for AGREEMENT FOR 

SINO-FOREIGN EQUITY JOINT VENTURE 
  

	1.2	 The Parties to this Agreement agree that from the execution date of this Agreement, Changhou Capital’s
rights and obligations under the JV Agreement will be transferred to Hong Xin Capital. Hong Xin Capital shall enjoy the benefits of Changhou Capital under the JV Agreement and perform Changhou Capital’s corresponding obligations under the JV
Agreement as if Hong Xin Capital is the original party of the JV Agreement. Changhou Capital and Hong Xin Capital shall be jointly and severally liable for the performance of the obligations under the JV Agreement. 

 

	1.3	 For receiving notices under the JV Agreement, the contact information of Hong Xin is as follows:

 Gongqingcheng Changhou Hong Xin Investment Management Partnership (Limited Partnership) 

Address: Floor 12, Taisite Building, No. 31, Sanhuan Middle Road, Haidian District, Beijing City 

Attention: Hong-Wei Hsieh 
 Email:
olucko@126.com 
 Article 2. Shanghai Zuzhu Changed Its Managing Partner 

 

	2.1	 The Managing Partner of Shanghai Zuzhu has been changed from Yu-Hua Zhu
to ChipMOS TECHNOLOGIES (BVI) LTD. (Representative: Lien-Fa Chou) (Incorporated in British Virgin Islands) 

  

	2.2	 For receiving notices under Section 20.8.1 of the JV Agreement, the contact information of Shanghai Zuzhu
is changed as follows: 

 Shanghai Zuzhu Business Consulting Partnership (Limited Partnership) 

Address: Room 170, Area 0, Floor 1, Building 2, No.1218, Xinda Road, Qingpu District, Shanghai 

Attention: Lien-Fa Chou 

Email: lafair_cho@chipmos.com 

  
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 (Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The Supplemental Agreement for AGREEMENT FOR 

SINO-FOREIGN EQUITY JOINT VENTURE 
  

 Article 3. Miscellaneous 
  

	3.1	 Terms that are not defined, however used in this Agreement, shall have the same meaning as those given in the
JV Agreement. 

  

	3.2	 In the event that this Agreement is inconsistent with the JV Agreement, this Agreement shall prevail. Matters
that are not specified in this Agreement shall be addressed in accordance with the JV Agreement. 

  

	3.3	 This Agreement may be modified or amended only by a written and signed agreement of the Parties. No waiver by
any Party of one or more rights under this Agreement shall be recognized as a waiver of any other right hereunder, nor shall such waiver be regarded as a waiver of the same right in any other circumstances. 

 

	3.4	 In case of a disputed provision, the remaining provisions of this Agreement shall remain in full force and
effect during the dispute. If any provision of this Agreement is deemed unenforceable or invalid, the remaining provisions of this Agreement shall remain in full force and effect. 

 

	3.5	 This Agreement shall become effective upon being signed and chopped by the Parties. 

 

	3.6	 This Agreement can be executed in as many originals as needed, while each original shall have the same legal
effect, and each Party shall retain no less than one (1) original. 

 [THE REMAINDER OF THIS PAGE IS INTENTIONALLY
LEFT BLANK] 

  
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 (Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The Supplemental Agreement for AGREEMENT FOR 

SINO-FOREIGN EQUITY JOINT VENTURE 
  

 [Signature Pages] 

IN WITNESS WHEREOF, the Parties hereto have duly executed this Agreement on the day and year set forth in recital above. 

 

			
	ChipMOS TECHNOLOGIES (BVI) LTD.
	(Seal)
		
	Signature:	 	
                     

	Name: Lien-Fa Chou
	 Title: Chairman

  
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 (Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The Supplemental Agreement for AGREEMENT FOR 

SINO-FOREIGN EQUITY JOINT VENTURE 
  

 [Signature Pages] 

IN WITNESS WHEREOF, the Parties hereto have duly executed this Agreement on the day and year set forth in recital above. 

 

			
	Accretech (China) Co Ltd.
	(Seal)
		
	Signature:	 	  

	Name: Hao Chen
	Title: Director / General Manager

  
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 (Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The Supplemental Agreement for AGREEMENT FOR 

SINO-FOREIGN EQUITY JOINT VENTURE 
  

 [Signature Pages] 

IN WITNESS WHEREOF, the Parties hereto have duly executed this Agreement on the day and year set forth in recital above. 

Gongqingcheng Changhou Hong Xin Investment Management Partnership (Limited Partnership) 

(Seal) 
  

			
	Signature:	 	
                     
    

	Name: Hong-Wei Hsieh
	Title: Representative of the Managing Partner

  
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 (Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The Supplemental Agreement for AGREEMENT FOR 

SINO-FOREIGN EQUITY JOINT VENTURE 
  

 [Signature Pages] 

IN WITNESS WHEREOF, the Parties hereto have duly executed this Agreement on the day and year set forth in recital above. 

 

			
	Tibet Unigroup GuoWei Investment Co., Ltd. (Seal)
		
	Signature:	 	  

	Name: Wei-Guo Zhao
	 Title: Executive Director

  
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 (Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The Supplemental Agreement for AGREEMENT FOR 

SINO-FOREIGN EQUITY JOINT VENTURE 
  

 [Signature Pages] 

IN WITNESS WHEREOF, the Parties hereto have duly executed this Agreement on the day and year set forth in recital above. 

 

			
	Chao-Jung Tsai
		
	Signature:	 	  

  
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 (Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The Supplemental Agreement for AGREEMENT FOR 

SINO-FOREIGN EQUITY JOINT VENTURE 
  

 [Signature Pages] 

IN WITNESS WHEREOF, the Parties hereto have duly executed this Agreement on the day and year set forth in recital above. 

 

			
	Shih-Jye Cheng
		
	Signature:	 	  

  
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 (Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The Supplemental Agreement for AGREEMENT FOR 

SINO-FOREIGN EQUITY JOINT VENTURE 
  

 [Signature Pages] 

IN WITNESS WHEREOF, the Parties hereto have duly executed this Agreement on the day and year set forth in recital above. 

 

			
	Shou-Kang Chen
		
	Signature:	 	  

  
 - 10 - 

 (Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The Supplemental Agreement for AGREEMENT FOR 

SINO-FOREIGN EQUITY JOINT VENTURE 
  

 [Signature Pages] 

IN WITNESS WHEREOF, the Parties hereto have duly executed this Agreement on the day and year set forth in recital above. 

 

			
	David W. Wang
		
	Signature:	 	  

  
 - 11 - 

 (Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The Supplemental Agreement for AGREEMENT FOR 

SINO-FOREIGN EQUITY JOINT VENTURE 
  

 [Signature Pages] 

IN WITNESS WHEREOF, the Parties hereto have duly executed this Agreement on the day and year set forth in recital above. 

Shanghai Zuzhu Business Consulting Partnership (Limited Partnership) 

(Seal) 
  

			
	Signature:	 	
                     

	Name: Lien-Fa Chou
	Title: Representative of the Managing Partner

  
 - 12 -EX-4.21

 Exhibit 4.21 

(Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The 2nd Supplemental Agreement for 

AGREEMENT FOR SINO-FOREIGN EQUITY JOINT VENTURE 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The 2nd Supplemental Agreement for 

AGREEMENT FOR SINO-FOREIGN EQUITY JOINT VENTURE 

WHEREAS, Tibet Unigroup GuoWei Investment Co., Ltd., ChipMOS TECHNOLOGIES (BVI) LTD., Gongqingcheng Changhou Investment Management Ltd., Accretech (China)
Co., Ltd., Chao-Jung Tsai, Shih-Jye Cheng, Shanghai Zuzhu Business Consulting Partnership (Limited Partnership), Shou-Kang Chen, David W.Wang, and Gongqingcheng Changhou Hong Xin Investment Management
Partnership (Limited Partnership) (“Hong Xin Capital”) made and executed the “AGREEMENT FOR SINO-FOREIGN EQUITY JOINT VENTURE” and the supplemental agreements thereof (hereinafter collectively referred to as “JV
Agreement”) respectively on November 30, 2016 and April 10, 2017 for the matter of the joint venture of ChipMOS TECHNOLOGIES (Shanghai) LTD. (“ChipMOS Shanghai” or the “Company”); 

WHEREAS, the Parties have partially remitted their capital contribution to the Company’s account in accordance with the JV Agreement; 

WHEREAS, the Parties wish to extend the time period for remittance of the newly increased amount of registered capital contribution to the Company. 

NOW, THEREFORE, in consideration of the mutual premises contained herein, the Parties hereto agree to this supplemental agreement for the JV Agreement
(“this Agreement”) through good faith negotiations on November 28, 2017 as follows: 
 Article 1. 

Section 5.3 of the JV Agreement (“Capital Contribution of the Parties and Shareholding Percentage”) shall be
amended as: 
 The capital contribution and shareholding percentage for the registered capital of the Company by each Party are as follows (amounts in RMB):

  
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 (Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The 2nd Supplemental Agreement for 

AGREEMENT FOR SINO-FOREIGN EQUITY JOINT VENTURE 
  

																					
	 Shareholder
	  	Total Capital
Contribution	 	  	The Amount
of Capital
from Transfer
of Equity
Interests	 	  	The Amount
of Capital
Already
Remitted	 	  	The Amount
of Capital
Remaining to
be Remitted	 	  	Shareholding
Percentage	 
	 Investor A
	  	 	1,185,044,913	 	  	 	669,516,900	 	  	 	329,937,928	 	  	 	185,590,085	 	  	 	48.0000	% 
	 ChipMOS BVI
	  	 	1,111,576,624	 	  	 	628,009,392	 	  	 	309,483,028	 	  	 	174,084,204	 	  	 	45.0242	% 
	 Hong Xin Capital
	  	 	49,376,805	 	  	 	27,896,500	 	  	 	13,747,395	 	  	 	7,732,910	 	  	 	2.0000	% 
	 Accretech
	  	 	34,964,934	 	  	 	19,754,200	 	  	 	9,734,870	 	  	 	5,475,864	 	  	 	1.4162	% 
	 Chao-Jung Tsai
	  	 	33,187,500	 	  	 	18,750,000	 	  	 	9,240,000	 	  	 	5,197,500	 	  	 	1.3443	% 
	 Shih-Jye Cheng
	  	 	27,656,250	 	  	 	15,625,000	 	  	 	7,713,225	 	  	 	4,318,025	 	  	 	1.1202	% 
	 Shanghai Zuzhu
	  	 	23,208,948	 	  	 	13,112,400	 	  	 	6,461,791	 	  	 	3,634,757	 	  	 	0.9401	% 
	 Shou-Kang Chen
	  	 	3,062,100	 	  	 	1,730,000	 	  	 	852,544	 	  	 	479,556	 	  	 	0.1240	% 
	 David W.Wang
	  	 	765,525	 	  	 	432,500	 	  	 	213,136	 	  	 	119,889	 	  	 	0.0310	% 

 In the event that one Party contributes capital by foreign currency, the exchange rate applicable to the capital contribution
shall be the central exchange rate as announced by the People’s Bank of China on the date of its capital contribution (Medial Rate). 

  
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 (Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The 2nd Supplemental Agreement for 

AGREEMENT FOR SINO-FOREIGN EQUITY JOINT VENTURE 
  

 Article 2. 

Section 5.4.2 of the JV Agreement shall be amended as: 
 The
Parties agree that: prior to June 30, 2018, after the resolution of the Board, the Parties shall, within thirty (30) days of such resolution, remit the funds to be contributed by the Parties in accordance with Section 5.3 to the
Company’s account. If any Party fails to remit its capital contribution in accordance with the provisions of this Agreement, such Party shall be obliged to pay interest on the unremitted portion to the Company in the form of a simple interest
payment for the period from the due date for remittance to the date of actual remittance, while the interest rate shall be 2% plus the one-year Renminbi loan interest rate to be implemented by the
People’s Bank of China. Other Parties who comply with this Agreement have the right to seek compensation from the defaulting Party to the extent permitted by Laws (including, in particular, a total amount equivalent to 20% of the defaulting
Party’s unremitted capital contribution to the Company’s registered capital). Nothing in this Section 5.4.2 shall prejudice any other right of the non-defaulting Party under this Agreement or
the applicable Laws. 
 Article 3. Miscellaneous 
  

	3.1	 Terms that are not defined, however used in this Agreement, shall have the same meaning as those given in the
JV Agreement. 

  

	3.2	 In the event that this Agreement is inconsistent with the JV Agreement, this Agreement shall prevail. Matters
that are not specified in this Agreement shall be addressed in accordance with the JV Agreement. 

  

	3.3	 This Agreement may be modified or amended only by a written and signed agreement of the Parties. No waiver by
any Party of one or more rights under this Agreement shall be recognized as a waiver of any other right hereunder, nor shall such waiver be regarded as a waiver of the same right in any other circumstances. 

 

	3.4	 In case of a disputed provision, the remaining provisions of this Agreement shall remain in full force and
effect during the dispute. If any provision of this Agreement is deemed unenforceable or invalid, the remaining provisions of this Agreement shall remain in full force and effect. 

 

	3.5	 This Agreement shall become effective upon being signed and chopped by the Parties. 

 

	3.6	 This Agreement can be executed in as many originals as needed, while each original shall have the same legal
effect, and each Party shall retain no less than one (1) original. 

 [THE REMAINDER OF THIS PAGE IS INTENTIONALLY
LEFT BLANK] 

  
 - 3 - 

 (Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The 2nd Supplemental Agreement for 

AGREEMENT FOR SINO-FOREIGN EQUITY JOINT VENTURE 
  

 [Signature Pages] 

 

			
	Tibet Unigroup GuoWei Investment Co., Ltd. (Seal)
		
	Signature:	 	
                     
                        

	Name: Wei-Guo Zhao
	Title:   Executive Director

  
 - 4 - 

 (Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The 2nd Supplemental Agreement for 

AGREEMENT FOR SINO-FOREIGN EQUITY JOINT VENTURE 
  

 [Signature Pages] 

 

			
	ChipMOS TECHNOLOGIES (BVI) LTD.
	(Seal)
	
	Signature:
                                         
                       
	Name: Lien-Fa Chou
	Title:   Chairman

  
 - 5 - 

 (Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The 2nd Supplemental Agreement for 

AGREEMENT FOR SINO-FOREIGN EQUITY JOINT VENTURE 
  

 [Signature Pages] 

 

			
	Gongqingcheng Changhou Hong Xin Investment Management Partnership (Limited Partnership)
	(Seal)

			
		
	Signature:	 	  

			
	Name: Hong-Wei Hsieh
	Title:   Representative of the Managing Partner

  
 - 6 - 

 (Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The 2nd Supplemental Agreement for 

AGREEMENT FOR SINO-FOREIGN EQUITY JOINT VENTURE 
  

 [Signature Pages] 

 

			
	Accretech (China) Co., Ltd.
	(Seal)
		
	Signature:	 	          

	Name: Hao Chen
	Title: Director / General Manager

  
 - 7 - 

 (Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The 2nd Supplemental Agreement for 

AGREEMENT FOR SINO-FOREIGN EQUITY JOINT VENTURE 
  

 [Signature Pages] 

 

			
	Chao-Jung Tsai
		
	Signature:	 	  

  
 - 8 - 

 (Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The 2nd Supplemental Agreement for 

AGREEMENT FOR SINO-FOREIGN EQUITY JOINT VENTURE 
  

 [Signature Pages] 

 

			
	Shih-Jye Cheng
		
	Signature:	 	  

  
 - 9 - 

 (Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The 2nd Supplemental Agreement for 

AGREEMENT FOR SINO-FOREIGN EQUITY JOINT VENTURE 
  

 [Signature Pages] 

 

			
	Shanghai Zuzhu Business Consulting Partnership (Limited Partnership)

			
	(Seal)
	
	Signature:
                                         
                       
	Name: Lien-Fa Chou
	Title:   Representative of the Managing Partner

  
 - 10 - 

 (Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The 2nd Supplemental Agreement for 

AGREEMENT FOR SINO-FOREIGN EQUITY JOINT VENTURE 
  

 [Signature Pages] 

 

			
	Shou-Kang Chen
		
	Signature:	 	  

  
 - 11 - 

 (Translation, for reference only) 

ChipMOS TECHNOLOGIES (Shanghai) LTD. 

The 2nd Supplemental Agreement for 

AGREEMENT FOR SINO-FOREIGN EQUITY JOINT VENTURE 
  

 [Signature Pages] 

 

			
	David W. Wang
		
	Signature:	 	  

  
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