Rocket Lab (NASDAQ: RKLB) CEO Peter Beck has issued a stark warning about overheating valuations across the AI and space sectors, describing market conditions as “piping hot.”

Beck made the comments in an interview with Newstalk ZB, where he acknowledged that his company’s stock has suffered despite meaningful operational improvements across the business.

“Rocket Lab as a business is fundamentally better in every single metric,” Beck said, adding that the stock price decline was driven by broader macroeconomic conditions beyond the company’s control.

“That’s just a complete macro, you know, environment thing that you can’t really control,” he said, reinforcing that investor sentiment had decoupled from underlying fundamentals.

RKLB stock fell 2% on Thursday, extending its losing streak to a second consecutive session and remaining on course for a fifth straight weekly decline.

Beck acknowledged that a speculative wave had swept across space and AI stocks, with investors purchasing into sector narratives rather than near-term financial performance.

When asked whether the enthusiasm across AI, chips and space could collapse, Beck said, “I mean, yes, I think it could, but also I think you’re buying into the promise and the hope of what it can potentially provide.”

Beck was candid about the pricing environment, stating, “Look, I’m not gonna defend, you know, some of the prices of some of these things. I think they’re very high value,” stopping well short of endorsing current market levels.

His concerns echo warnings he raised in June, when he said some space-sector valuations were “completely untethered to reality,” a phrase that drew significant attention from investors and analysts alike.

The broader sector rally was ignited by SpaceX’s blockbuster market debut, with the company listing at an approximate valuation of $1.75 trillion despite reporting $18.67 billion in 2025 revenue and a $4.94 billion net loss, pricing shares at roughly 94 times annual sales.

Musk’s prediction that orbital AI computing could eventually undercut terrestrial data centers in cost helped fuel the enthusiasm, drawing capital into publicly listed space companies at an accelerating pace.

Rocket Lab itself hit a market cap of roughly $66 billion against $600 million in 2025 revenue in the lead-up to the SpaceX IPO, a ratio that raised eyebrows across the investment community.

The rally reversed sharply on June 12, the day SpaceX debuted on the Nasdaq, with Rocket Lab falling 10.8%, Planet Labs (PL) declining 8.8%, Intuitive Machines (LUNR) sinking 13.1%, and AST SpaceMobile (ASTS) losing approximately 16%.

Despite questioning elevated valuations across the sector, Beck defended Rocket Lab’s own premium by pointing to the extreme scarcity of commercial orbital launch providers.

“It’s SpaceX and Rocket Lab, that’s it,” Beck said, arguing that operating as one of only two companies regularly flying commercial orbital rockets justifies a meaningful valuation premium.

Beck noted that 142 small-rocket companies existed when Rocket Lab began developing its Electron rocket, but the field eventually “whittled down to one, which is us,” underscoring how difficult the business is to execute at scale.

“Rocket science doesn’t change,” he said, framing operational execution rather than ambition as the ultimate barrier to entry in the commercial launch market.

Beck called rockets the “keys to space” and predicted that the industry’s long-term winners would need to combine launch capabilities, satellite manufacturing and service operations under one roof.

Retail sentiment on Stocktwits has turned “bearish” on RKLB over the past week, coinciding with a 51% decline in 24-hour message volumes, though the stock has still gained 34% over the past year.