Table:
|  | As of April 14, 2018 | As of April 14, 2019 | As of April 12, 2020 | As of April 12, 2020 |
| --- | --- | --- | --- | --- |
|  | Number of common shares beneficially owned | Number of common shares beneficially owned | Number of common shares beneficially owned | Number of common shares beneficially owned |
| Name of Beneficial Owner |  |  |  |  |
| Hsun Chieh Investment Co., Ltd. (1) | 3.50% | 3.64% | 441,371,000 | 3.75% |
| Silicon Integrated Systems Corp. | 2.50% | 2.35% | 285,380,424 | 2.42% |
| Directors and executive officers as a group | 6.32% | 6.67% | 832,664,416 | 7.07% |
Paragraphs:
The following table sets forth information known to us with respect to the beneficial ownership of our common shares as of (i) April 12, 2020, our most recent record date, and (ii) as of certain record dates in each of the preceding three years, for (1) the stockholders known by us to beneficially own more than 2% of our common shares and (2) all directors and executive officers as a group. Beneficial ownership is determined in accordance with SEC rules.
(1) 36.49% owned by United Microelectronics Corporation as of March 31, 2020.
None of our major stockholders have different voting rights from those of our other stockholders. To the best of our knowledge, we are not directly or indirectly controlled by another corporation, by any foreign government or by any other natural or legal person severally or jointly.
For information regarding our common shares held or beneficially owned by persons in the United States, see “Item 9. The Offer and Listing—A. Offer and Listing Details—Market Price Information for Our American Depositary Shares” in this annual report.
Question:
What is the increase/ (decrease) in number of common shares beneficially owned of Silicon Integrated Systems Corp. from April 14, 2018 to April 14, 2019?
Answer: 2.35-2.50 = -0.15