The next chart (Fig.2) shows the same pie of realised amount split by stock exchange and company name (ticker). The colouring scheme is important: dark green companies are the most profitable IPOs (growth from the initial price of offering to the current day 11-Dec), white are neutral, and red are negative.
At first sight everything seems to be very positive: almost all squares are green or white, NYSE has larger and more green deals (111% average increase) than NASDAQ (57% average increase). The problem is that it is harder or more expensive (higher fees) to invest in those deals before they go to the open market (stock exchange), unless you're a large institutional investor who has access to the investment banks doing the IPO listing. You can try to buy ETFs focused on IPOs (e.g. Renaissance IPO ETF
grew more than 2x in 2020 in less than one year), but it also bears some risks and caveats (Can Mutual Funds and ETFs Invest in IPOs?
For example, GDRX (GoodRx Holdings, Inc.) in the bottom left corner was a large IPO on NASDAQ ($1.1b), grew 29% from the IPO price to the current price Dec, 11th in just 81 days.