Singapore's richest are the focus of this list today. Nearly half of them made their fortunes through real estate activities, including hotels, shopping malls and high-end luxury properties around the world. Check out the list below:

1. Ron Sim – $1.2 billion, malls, luxury massage chairs and healthcare products

2. Zhong Sheng Jian – $1.3 billion, luxury developers.

3. Koh Wee Meng – $1.3 billion, Fragrance Group, real estate.

4. Asok Kumar Hiranandani – $1.4 billion, Royal Group Holdings, malls, hotels and office complexes.

5. Sam Goi – $1.8 billion, Tee Yih Jia Foods, food and beverages.

6. Lim Oon Kuin – $2 billion, Hin leong Trading, oil.

7. Peter Lim – $2.2 billion, Investments.

He's also famous because he's the father of Kim Lim, an Instagram celebrity.

8. Kuok Khoon Hong – $2.3 billion, Wilmar International, palm oil.

9. Raj Kumar and Kishin RK – $2.3 billion, real estate, Singapore RiverOne.

10. Jason Chang – $2.9 billion, semiconductors, real estate.

11. Goh Cheng Liang – $4 billion, paint magnate.

12. Kwee Brothers – $5.1 billion, Pontiac Land, luxury properties.

13. Wee Cho Yaw – $5.9 billion, United Overseas Bank.

14. Kwek Leng Beng – $7.5 billion, City Developments and Millennium & Copthorne Hotels.

15. Robert and Philip Ng – $11.8 billion, real estate and development.