Rocket Lab Stock Slides 18% Over 6 Straight Down Days
A multi-day slide in this aerospace stock has erased billions in value, prompting a closer look at the business beneath the price action.
Rocket Lab (RKLB) stock has now moved lower for 6 consecutive trading days, a cumulative loss that has reached 18%. That streak has erased about $9.6 billion from the company’s market value, which now stands at about $42 billion.
For anyone holding the stock, this persistent selling pressure forces a fresh look at the price relative to the underlying business.
RKLB Versus The S&P 500, Streak And Beyond
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Here is how RKLB stock stacks up against the S&P 500 over the streak and the periods around it:
| Return Period | RKLB | S&P 500 |
|---|---|---|
| 1D | -2.0% | 0.3% |
| 6D (Current Streak) | -18.5% | -0.9% |
| 1M (21D) | -0.0% | 3.6% |
| 3M (63D) | -53.3% | 2.1% |
| YTD 2026 | -4.1% | 12.2% |
| 2025 | 173.9% | 16.4% |
| 2024 | 360.6% | 23.3% |
| 2023 | 46.7% | 24.2% |
Are The Fundamentals Justifying This Pressure?
This decline appears to be specific to the company, not a reflection of the broader market. Over the same 6 trading days, the S&P 500 returned -0.9%. While the company’s top-line growth is substantial, with revenue over the last twelve months growing 52.5% against an S&P 500 median of 8.4%, its profitability metrics show significant strain. Its operating margin over the last twelve months is -29.1%, a stark contrast to the S&P 500 median of 18.4%. The company also has negative trailing earnings, meaning it does not have a meaningful price-to-earnings multiple. The market may be weighing these persistent operational losses more heavily than its sales growth.
What Is The Disciplined Way To Read A Streak?
A streak is information, not an instruction. It tells you where momentum and market attention are focused, but it doesn’t tell you whether the crowd is right or wrong. The disciplined response is not to chase the move, but to use it as a trigger to check your own thesis. The numbers here provide a starting point for that work: a business with rapid expansion but without positive earnings, now trading at a lower price. The question is whether that new price fairly reflects that specific trade-off.
A slide like this always poses the same follow-up: which marked-down stocks are actually worth buying? Our Buy the Dip screen runs that test every day, flagging beaten-down names whose fundamentals still hold up.
And for anyone who would rather back the theme than one company’s story, an aerospace & defense ETF like MISL holds the sector rather than this one name. It is still a concentrated bet on that one theme, though, which is exactly the gap the portfolio below closes.
Falling Prices Test Conviction. Rules Do Not Flinch
A losing streak forces a choice on every holder: sell into weakness, average down, or freeze. All three are emotional answers to what should be an analytical question, and emotions priced at market open are expensive.
The Trefis High Quality (HQ) Portfolio takes the emotion out: about 30 quality businesses screened for the fundamentals that survive bad stretches, held and rebalanced by rules. It has a track record of outpacing a benchmark that combines the three major indices – the S&P 500, S&P Mid-cap, and Russell 2000. Let the rules do the heavy lifting for you.