Here are the top 10 biggest tech IPOs in history:

1. Saudi Aramco – $29.4 billion (2019): Although not a strictly tech company, it had the largest IPO to date.

2. Alibaba Group Holding Ltd – $25 billion (2014): Chinese e-commerce giant Alibaba held the largest tech IPO before Saudi Aramco.

3. SoftBank Corp – $23.5 billion (2018): The Japanese telecoms and technology company raised significant funds through its IPO.

4. Facebook Inc – $16 billion (2012): The social media giant had a highly anticipated IPO, making it one of the largest tech offerings at that time.

5. Visa Inc – $17.9 billion (2008): While not a tech company in the traditional sense, Visa’s IPO marked a milestone for the industry.

6. AT&T Wireless – $10.6 billion (2000): This IPO marked one of the largest offerings in the tech sector during the dot-com bubble.

7. Twitter Inc – $2.1 billion (2013): The popular social media platform went public in 2013 with a highly anticipated IPO.

8. Snap Inc – $3.4 billion (2017): The company behind Snapchat had a successful IPO, although it faced challenges later on.

9. Meituan Dianping – $4.2 billion (2018): A Chinese online marketplace with a focus on food delivery and other services.

10. JD.com – $1.8 billion (2014): The Chinese e-commerce company had a significant IPO and remains a major player in the industry.

Please note that these figures are based on the initial public offerings (IPOs), and subsequent market fluctuations may have impacted the valuation of these companies.