Rocket Lab shares are due to begin trading on New York's Nasdaq exchange on Thursday.
The company founded by Peter Beck intends to raise US$467 million in the float, which observers said signals an initial market capitalisation on the exchange of over four and a half billion dollars.
Rocket Lab first announced plans to go public in March, along with plans to build a medium-lift rocket called Neutron.
In 2020, Rocket Lab had $35M in revenue, but it has forecasted more than one billion in revenue by 2026 - roughly 60 percent from launches, and 40 percent from space systems.