Celestica Stock Rides An 8-Day Winning Streak To An 18% Gain
A multi-day run has changed the narrative for the stock, but the underlying business metrics tell a more complicated story.
An eight-day run in Celestica (CLS) stock has added about $6.6 billion to the company’s market value, which now stands at about $43 billion. The stock has moved higher for 8 consecutive trading days, producing a cumulative gain of 18% over that period. Celestica stock trades at about $373.56 a share as of 9/24/2026.
The move has been a sharp reversal from the prior trend. Over the last three months, the stock has returned just +3.4%, meaning the period outside this recent streak was negative.
CLS Versus The S&P 500, Streak And Beyond
Here is how CLS stock stacks up against the S&P 500 over the streak and the periods around it:
| Return Period | CLS | S&P 500 |
|---|---|---|
| 1D | 3.2% | -0.0% |
| 8D (Current Streak) | 18.2% | 1.1% |
| 1M (21D) | 21.7% | 0.3% |
| 3M (63D) | 3.4% | 4.7% |
| YTD 2026 | 26.4% | 12.5% |
| 2025 | 220.3% | 16.4% |
| 2024 | 215.2% | 23.3% |
| 2023 | 159.8% | 24.2% |
The stock’s run stands apart from its fundamentals and the market.
This streak is primarily the stock’s own story. Over the same 8 trading days, the S&P 500 returned +1.1%. The sources for this note do not show why the move happened.
The company’s fundamentals present a mixed picture when compared to medians for S&P 500 Information Technology stocks. Revenue over the last twelve months grew 47.3%, well ahead of the 17.9% median. Its price-to-earnings multiple of 38.5 is also slightly above the median of 36.4. However, its operating margin of 8.8% sits below the group’s 21.6% median.
A streak is a signal to check the story, not a command to act.
A sustained move in one direction is information. It tells you that market attention and momentum are present, but it is not an instruction to buy or sell. The disciplined response is to treat the new price as a prompt to re-examine the business itself.
The data here offers a starting point for that work. It allows an investor to weigh the company’s growth, profitability, and valuation against the price the market is currently asking.
If you are hunting for strength that has more behind it than a hot tape, our Guidance Momentum screen surfaces the names where management raised its own outlook, which is the kind of momentum that tends to persist.
Prefer the theme to this single name? A technology ETF like XLK holds the whole group, not the single stock. It is still a concentrated bet on that one theme, though, which is exactly the gap the portfolio below closes.
Streaks End. Discipline Compounds
A run like this is genuinely useful information: something about this business has the market’s full attention. But streaks are where discipline gets tested, because the urge to chase strength is strongest right before it pauses.
The Trefis High Quality (HQ) Portfolio channels that urge into a system: roughly 30 businesses selected for consistent cash generation, strong margins, and resilient balance sheets, sized and rebalanced with rules rather than excitement. 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. Enjoy the streak; own the process.