New Delhi: Amid a grim economic situation prevalent at the global level, Indian billionaires continue to prosper. Forbes released a list of India's wealthiest people putting Reliance Industries chairman Mukesh Ambani on the top with a personal wealth of $21 billion, followed by steel magnate Lakshmi N. Mittal who has wealth of $16.2 billion. Despite a slowing economy, the collective wealth of the richest 100 Indians grew at 3.7 per cent to a total of $250 billion. India TV takes a look at top 10 business persons in the year 2013 list:1. Mukesh AmbaniHe is India's richest man for the sixth straight year as per the Forbes list. Ambani holds 40 percent Reliance Industries and is worth $21 billion. He now plans to build the country's first 4G wireless network through Reliance in 700 cities. 2. Lakshmi Mittal This steel baron is the second richest Indian and is now worth $16.2 billion. Mittal had reported a $3.7 billion net loss last year but was able to raise $4 billion in January share sale. He has been a UK resident since 2008. 3. Dilip Shangvi Shanghvi is the founder and biggest stockholder of Sun Pharmaceuticals, India's most valuable drug company. Since 1997, he has acquired 13 pharmaceutical makers through Sun. Shanghvi is country's biggest dollar gainer this year, up by $4.7 billion. His net worth is $13.9 billion, according to the Forbes list. 4. Azim Premji Wipro chairman Premji dropped one place in the list but managed to increase his fortune by $1.6 billion in the past year. The tech tycoon is worth $13.8 billion today. 5. Pallonji Mistry Mistry, along with his sons, own 18 percent stake in Tata Sons, benefited from its rising value. His fortune currently amounts to $12.5 billion. He built the Taj Mahal Palace hotel in Mumbai, which was attacked by terrorists in 2008. 6. Hinduja BrothersMultinational conglomerate Hinduja Group is controlled by four brothers: Srichand, Gopichand, Prakash and Ashok. Their business in 37 countries is worth $9 billion today. 7. Shiv Nadar Nadar is the founder of HCL Technolodies, India's fourth largest software exporter. His 62 percent stake in the company benefitted him to make a fortune of $8.6 billion. 8. Adi Godrej The 116-year-old Godrej Group works under the supervision of Adi Godrej. He is worth $8.3 billion, as per the Forbes list. 9. Kumar Birla Kumar Birla is the chairman of Aditya Birla Group which owns India's second largest aluminium manufacturer Hindalco Industries and Grasim Industries and iron ore miner Essel. He is worth $7.6 billion. 10. Sunil Mittal Owner of Bharti Airtel, which has 275 million customers worldwide, Sunil Mittal has made a fortune of $6.6 billion. His shares at Bharti Airtel perked up when it reported higher revenues per user in last quarter, according to Forbes.