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Investments Accounted for Using Equity Method (Tables) | 12 Months Ended
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Dec. 31, 2017
Summary of Investments in Associates | Associates consisted of the following:
|  |  |  | Place of |  | Carrying Amount |  |  | % of Ownership and Voting Rights Held by the Company |
Name of Associate |  | Principal Activities |  | Incorporation and Operation |  | December 31, 2016 |  |  | December 31, 2017 |  |  | December 31, 2016 |  |  | December 31, 2017 |
|  |  |  |  |  | NT$ |  |  | NT$ |  |  |  |  |  |  |
|  |  |  |  |  | (In Millions) |  |  | (In Millions) |  |  |  |  |  |  |
Vanguard International Semiconductor Corporation (VIS) |  | Manufacturing, selling, packaging, testing and computer-aided design of integrated circuits and other semiconductor devices and the manufacturing and design service of masks |  | Hsinchu, Taiwan |  | $ | 8,665.0 |  |  | $ | 8,465.0 |  |  |  | 28% |  |  |  | 28% |
Systems on Silicon Manufacturing Company Pte Ltd. (SSMC) |  | Manufacturing and selling of integrated circuits and other semiconductor devices |  | Singapore |  |  | 7,163.5 |  |  |  | 5,677.6 |  |  |  | 39% |  |  |  | 39% |
Xintec Inc. (Xintec) |  | Wafer level chip size packaging and wafer level post passivation interconnection service |  | Taoyuan, Taiwan |  |  | 2,599.8 |  |  |  | 2,292.1 |  |  |  | 41% |  |  |  | 41% |
Global Unichip Corporation (GUC) |  | Researching, developing, manufacturing, testing and marketing of integrated circuits |  | Hsinchu, Taiwan |  |  | 1,157.0 |  |  |  | 1,273.9 |  |  |  | 35% |  |  |  | 35% |
Mutual-Pak |  | Manufacturing of electronic parts, wholesaling and retailing of electronic materials, and researching, developing and testing of RFID |  | New Taipei, Taiwan |  |  | — |  |  |  | 23.2 |  |  |  | — |  |  |  | 39% |
|  |  |  |  |  | $ | 19,585.3 |  |  | $ | 17,731.8 |  |  |  |  |  |  |  |  |
Summary of Market Prices of Investments Accounted for Using Equity Method in Publicly Traded Stocks Calculated by Closing Price at End of Reporting Period |
|  | December 31, 2016 |  |  | December 31, 2017 |
|  | NT$ |  |  | NT$ |
Name of Associate |  | (In Millions) |  |  | (In Millions) |
VIS |  | $ | 26,089.4 |  |  | $ | 30,638.8 |
GUC |  | $ | 3,665.0 |  |  | $ | 11,905.4 |
Xintec |  | $ | 3,622.2 |  |  | $ | 9,180.8 |
Vanguard International Semiconductor Corporation [member] |
Summarized Financial Information of Associates |
|  | December 31, 2016 |
|  | NT$ |
|  | (In Millions) |
Current assets |  | $ | 25,662.9 |
Noncurrent assets |  | $ | 9,501.4 |
Current liabilities |  | $ | 5,975.7 |
Noncurrent liabilities |  | $ | 804.1 |
|  | Years Ended December 31 |
|  | 2015 |  |  | 2016 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Net revenue |  | $ | 23,319.7 |  |  | $ | 25,828.6 |
Income from operations |  | $ | 4,593.4 |  |  | $ | 6,083.6 |
Net income |  | $ | 4,253.9 |  |  | $ | 5,389.6 |
Other comprehensive income (loss) |  | $ | (61.9 | ) |  | $ | 5.6 |
Total comprehensive income |  | $ | 4,192.0 |  |  | $ | 5,395.2 |
Cash dividends received |  | $ | 1,206.4 |  |  | $ | 1,207.0 |
Reconciliation of Summarized Financial Information to Carrying Amount of Interest in Associate Recognized in Consolidated Statements of Financial Position | Reconciliation of the above summarized financial information to the carrying amount of the interest in the associate was as follows:
|  | December 31, 2016 |
|  | NT$ |
|  | (In Millions) |
Net assets |  | $ | 28,384.5 |
Percentage of ownership |  |  | 28% |
The Company’s share of net assets of the associate |  |  | 8,038.5 |
Goodwill |  |  | 626.5 |
Carrying amount of the investment |  | $ | 8,665.0 |
Systems on Silicon Manufacturing Company Pte Ltd. [member] |
Summarized Financial Information of Associates |
|  | December 31, 2016 |
|  | NT$ |
|  | (In Millions) |
Current assets |  | $ | 14,585.1 |
Noncurrent assets |  | $ | 5,360.1 |
Current liabilities |  | $ | 1,746.6 |
Noncurrent liabilities |  | $ | 286.3 |
|  | Years Ended December 31 |
|  | 2015 |  |  | 2016 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Net revenue |  | $ | 15,026.0 |  |  | $ | 14,045.9 |
Income from operations |  | $ | 5,802.3 |  |  | $ | 4,921.7 |
Net income |  | $ | 5,904.6 |  |  | $ | 4,918.1 |
Total comprehensive income |  | $ | 5,904.6 |  |  | $ | 4,918.1 |
Cash dividends received |  | $ | 1,556.6 |  |  | $ | 4,076.2 |
Reconciliation of Summarized Financial Information to Carrying Amount of Interest in Associate Recognized in Consolidated Statements of Financial Position | Reconciliation of the above summarized financial information to the carrying amount of the interest in the associate was as follows:
|  | December 31, 2016 |
|  | NT$ |
|  | (In Millions) |
Net assets |  | $ | 17,912.3 |
Percentage of ownership |  |  | 39% |
The Company’s share of net assets of the associate |  |  | 6,948.2 |
Goodwill |  |  | 214.0 |
Other adjustments |  |  | 1.3 |
Carrying amount of the investment |  | $ | 7,163.5 |
Aggregated individually immaterial associates [member] |
Summarized Financial Information of Associates | Aggregate information of associates that are not individually material was summarized as follows:
|  | Years Ended December 31 |
|  | 2015 |  |  | 2016 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
The Company’s share of profits (losses) of associates |  | $ | (154.2 | ) |  | $ | 22.5 |
The Company’s share of other comprehensive income (loss) of associates |  | $ | 7.9 |  |  | $ | (5.2 | )
The Company’s share of total comprehensive income (loss) of associates |  | $ | (146.3 | ) |  | $ | 17.3 |

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