Comcast (CMCSA) shares saw a significant increase, surging almost 22% in premarket trading. This rise was attributed to an impending split and appears to follow a period where the company reported stronger-than-expected revenue and profit in Q4, despite challenges in its broadband business earlier in the year. The company's diverse holdings, including Xfinity, NBC, and Universal Pictures, contribute to its overall performance.

Simultaneously, Rocket Lab (RKLB) experienced a jump of more than 11% in early trading. This positive movement is linked to a recent successful launch and a new deal involving satellite services with Iridium, highlighting investor confidence in the company's space systems and launch capabilities.

In broader market news, other companies experienced fluctuations. SpaceX (SPCX) shares saw volatility after a multi-day selloff, dropping as much as 3.9%. Conversely, IBM (IBM) resisted a broader tech selloff, with its shares gaining after a Morgan Stanley analyst upgraded its target to $267 from $225. Carnival (CCL) shares, however, slumped as much as 11% following a third-quarter adjusted earnings per share forecast that missed consensus estimates, amid wider concerns in travel stocks due to a selloff in Korean chipmakers.