Here are some of the top tech startup companies in Southeast Asia that I know of. Some of them may not even be startups anymore, but they are definitely tech companies.

• Grab (Singapore)
  
• Gojek (Indonesia)
• Carsome (Malaysia)
• Shopee / Garena (Singapore)
• Lazada (Malaysia)
• Kumu (Philippines)
• GCash (Phlippines)
• Carousell
• Razer

Top technology startup companies in Southeast Asia:

• Grab, Singapre
• SEA / Garena, Singapore
• GoJek, Singapore
• Tokopedia, Indonesia
• Lazada, Malaysia
• Shopee, Malaysia
• Bigo, Singapore
• One Championship, Singapore
• Ninja Van, Singapore
• JNT, Indonesia
• Traveloka, Indonesia
• Binance, Singapore
• Bukalapak, Indonesia
• Carsome, Malaysia