Stocks popular with retail traders on WallStreetBets were under pressure again before Thursday's opening bell, with Rocket Lab and CoreWeave leading the declines. Rocket Lab fell 9.3% in premarket trading after the space company said it would delay the first launch of its Neutron rocket to 2027, while CoreWeave dropped 5.9% after its CEO reportedly called the recent selloff "irrational" in an internal memo.
The moves were part of a broader risk-off tone across a cluster of tech-linked names that tend to attract fast-moving retail trading. Even megacap chip bellwethers like Nvidia and Taiwan Semiconductor Manufacturing were lower in premarket, extending declines from the prior session.
What's behind the drops
Rocket Lab, a company that builds rockets and spacecraft, said it discovered a manufacturing-process issue on Neutron's forward dome, a key structural component. That pushed the rocket's debut from its previously expected timeline to 2027, a delay that investors had been watching closely. The news hit the stock hard, as the company's valuation has been tied to the success of Neutron, which is designed to compete in the small-to-medium launch market.
CoreWeave, an AI cloud-computing firm that has grown rapidly by leasing data centers and GPUs to AI companies, was on track for a second straight down day after a steep fall in the prior session. Bloomberg reported that CEO Mike Intrator sent a memo to staff calling the market's reaction "irrational," a comment that did little to calm investors worried about the company's heavy debt load and its reliance on a handful of big customers.
The two stories are different, but they share a common thread: both companies are high-growth, high-valuation names where sentiment can shift quickly. When attention is high and conviction is fragile, bad news can spread through the sector, making unrelated tickers move together.
Why premarket moves can be exaggerated
Premarket trading is thinner than regular hours, meaning fewer orders can move prices more dramatically. That's why a 9.3% drop before the open doesn't always translate into the same move once the market opens. But for stocks heavily traded by retail investors, the dynamics can be amplified.
Many retail traders use options and margin borrowing, which can force quick de-risking when a fresh catalyst hits. As prices fall, options market makers often hedge by selling the underlying stock, which can add mechanical selling pressure rather than cushioning the move. The result is bigger gap risk at the opening bell and higher implied volatility, which is the market's estimate of future price swings.
That volatility can linger across the whole "retail basket," sometimes pressuring larger, related bellwethers too. In this case, the weakness in AI-linked names like Nvidia and TSMC suggests the selling isn't confined to just the two companies in the headlines.
What it means for investors
For everyday investors, the key takeaway is that premarket moves in high-flying stocks can be dramatic but may not reflect the full picture. A single piece of news—like a rocket delay or a CEO's memo—can trigger outsized reactions, especially in names with high retail ownership and heavy options activity.
It's also worth remembering that these stocks are often priced for perfection. Rocket Lab's delay is a tangible setback, but the company still has a growing launch and space-systems business. CoreWeave's "irrational" comment suggests management believes the market is overreacting, but the company's debt load remains a real concern, as we've noted before.
The broader AI trade has been under pressure recently, with inflation data hitting Asian tech stocks and Nikkei plunging on AI stock worries. That context matters: when the whole sector is wobbling, individual bad news can have a bigger impact than it would in a calmer market.
For those watching from the sidelines, the lesson is to focus on fundamentals rather than short-term price swings. A premarket drop of 9% can be alarming, but it's not a signal to panic or to buy. It's a reminder that high-growth stocks carry high risk, and that volatility is part of the package.
As always, diversification and a long-term perspective are your best defenses against the kind of whiplash moves we're seeing today.
