New Delhi, Oct. 28 -- The 1999 IPO boom didn't end well for many who bought into the dot-com hype.

Remember theglobe.com? Webvan? Pets.com and its sock puppet? No, no, and, well, the sock puppet is hard to forget.

What about today's crop of IPOs? They're massive by comparison, and there are fewer of them, creating an environment that could be riskier for investors, according to the experts.

In 1999, there were 476 IPOs that collectively raised $65 billion in proceeds-$133 billion today, adjusted for inflation, pointed out Nicholas Colas, co-founder of DataTrek Research, in a report Tuesday.

But SpaceX raised $86 billion alone in its June IPO. And Anthropic could raise nearly $100 billion.

"A few blockbuster IPOs, as is the case now, ...