The list comprises six Americans, four Britons, a Thai, an Australian, a Hong Konger, a Kenyan, and a Maldivian. They are all between 11 and 12 years old.
According to the website, Dhanat Lewtianyingthawee of Thailand has made more than 2,000 abstract paintings, many of them being sold internationally at high prices.
The child prodigy is a renowned violinist who has been performing around the globe since he was little. A YouTube video of him performing a solo piece when he was four years-old has almost 23 million views. The video was uploaded in February 2007.
Dhanat is also a golfer and studies martial arts.
The boy was quoted on the site tas saying, "And the most frequent question that I have been asked is what I will be when I grow up. This is a very big question...because whatever we choose, we have to stick with it for our life. Therefore, I ought to be very careful before making any decision."
Danat's father, Tanoo Plaewtianyingtawee, said his son has joined research projects with Mahidol University's faculty of science and computer science and at Chulalongkorn Univerisity's faculty of science.
In the YouTube video above, Dhanat plays violin and delivers a speech in 2013 Thailand's Scientist of the Year Awards.
The 11-year-old was home schooled after he finished third grade. He is currently studying online with lecturers at Massachusetts Institute of Technology, Harvard University, Oxford University and Berkeley Universty.
Mr Tanoo said his son's childhood was not much different from other youngsters. However, despite his good social skills, other preteens often find his son boring because his interests are far beyond his years, he added.
Dhanat said he is honoured to be named among the "15 Smartest Preteens in the World", but he still has a long way to go and still has to go through the trials and errors that everybody else experiences.
"One day I want to invent something that is useful for mankind," Dhanat said.