EMCOR Stock Slides 18% Over 10 Straight Down Days
Shares of EMCOR (EME) have closed lower in each of the last 10 sessions, a cumulative decline of 17.9%. That erased about $6.3 billion from the company’s market value, which now stands at about $28.8 billion. The stock closed at $647.66 on Friday, October 23, 31.3% below its 52-week high of $942.76 and 11.6% above its low of $580.33.

EME Versus The S&P 500
Returns for EME and the S&P 500 over the streak and the periods around it, all ending Friday, October 23 and including dividends:
| Return Period | EME | S&P 500 |
|---|---|---|
| 1 Day | -1.9% | -0.5% |
| 10 Days (Current Streak) | -17.9% | -2.4% |
| 1 Month (21 Trading Days) | -13.8% | -1.0% |
| 3 Months (63 Trading Days) | -12.8% | 3.1% |
| Year To Date | 6.1% | 12.4% |
| 1 Year (252 Trading Days) | -2.1% | 15.1% |
A Stock-Specific Slide, Or A Market Move?
The market explains little of this: the S&P 500 lost 2.4% over the same 10 sessions, including dividends, against EMCOR’s -17.9%. 1 other S&P 500 stock is currently on losing streaks of 10 days or longer. Over the past three months the stock is down 12.8%, a window that includes the streak; over the other 53 sessions of that window it was up 6.3%.
Is The Business As Weak As The Stock?
On the fundamentals, revenue grew 18.9% over the last twelve months, against a median of 7.8% for S&P 500 Industrials stocks; its operating margin is 9.6%, versus a median of 17.6%; and the stock trades at 20.0 times trailing earnings against a median of 26.3. On these numbers the business looks sturdier than the stock, with revenue growth above the median and a multiple below the median.
A slide like this raises an obvious 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.
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 rebalanced with rules. It has a track record of outpacing a benchmark that combines the S&P 500, the S&P MidCap 400, and the Russell 2000. Study the slide; spread the risk.