The Trade Desk Stock Slides 18% Over 9 Straight Down Days
A nine-day slide has erased a significant chunk of the company’s value.
The Trade Desk (TTD) stock has fallen 18% over a straight nine-day slide. That decline has erased about $1.2 billion from the company’s market value, which now stands at about $5.8 billion.
The stock trades at about $12.34 a share as of 9/28/2026, its low point over the last 52 weeks. The high over that same period was $54.13.
TTD Versus The S&P 500, Streak And Beyond
Here is how TTD stock stacks up against the S&P 500 over the streak and the periods around it:
| Return Period | TTD | S&P 500 |
|---|---|---|
| 1D | -2.1% | -0.8% |
| 9D (Current Streak) | -17.7% | 1.3% |
| 1M (21D) | -8.0% | -0.6% |
| 3M (63D) | -33.8% | 3.3% |
| YTD 2026 | -67.5% | 12.2% |
| 2025 | -67.7% | 16.4% |
| 2024 | 63.3% | 23.3% |
| 2023 | 60.5% | 24.2% |
Does the business justify this price?
This move is specific to the stock. Over the same nine trading days, the S&P 500 returned +1.3%. The Trade Desk was removed from the S&P 500 before the open on September 21, in the middle of this streak.
On the fundamentals, the company’s revenue over the last twelve months grew 11.6%, compared to a 6.8% median for its S&P 500 Communication Services peers. Its operating margin of 19.6% is just under the peer median of 20.1%. Following the slide, the stock trades at a price-to-earnings multiple of 14.2, below the sector median of 17.1.
How should I think about a streak like this?
A long streak is information, not an instruction. It tells you where momentum and market attention have been focused, but it does not predict where they will go next. The disciplined response is not to chase the trend but to check the business against the new price.
The numbers here offer a starting point for that work. Revenue grew 11.6% over the last twelve months, and the P/E is 14.2, but the stock also fell 67.7% in 2025 and 67.5% so far in 2026.
If the drop has you weighing an entry, resist buying on price alone. Our Buy the Dip screen ranks the marked-down names where growth and cash generation still hold up.
A Slide Like This Is Why Diversification Exists
Watching one stock fall day after day is the clearest lesson the market teaches about single-name risk. Whether this particular decline is an opportunity or a warning, the deeper point is the same: no one name should be able to do this to your portfolio.
The Trefis High Quality (HQ) Portfolio is built on that principle: roughly 30 businesses selected for consistent cash generation, strong margins, and resilient balance sheets, sized and re-balanced with 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. Study the slide; spread the risk.