Aon Stock Slides 11% Over 8 Straight Down Days
A persistent multi-day slide in the company’s stock has drawn investor attention, but the underlying business metrics present a mixed picture.
A recent slide in Aon (AON) stock has erased about $7.6 billion from the company’s market value. The shares have now moved lower for 8 consecutive trading days, a streak that has produced a cumulative loss of 11%. The company’s market value now stands at about $59 billion.
Aon stock trades at about $276.09 a share as of 9/24/2026. The sources for this article do not show why the move happened.
The Streak Next To The S&P 500
Here is how AON stock stacks up against the S&P 500 over the streak and the periods around it:
| Return Period | AON | S&P 500 |
|---|---|---|
| 1D | -2.0% | -0.0% |
| 8D (Current Streak) | -11.4% | 1.1% |
| 1M (21D) | -22.2% | 0.3% |
| 3M (63D) | -12.4% | 4.7% |
| YTD 2026 | -21.2% | 12.5% |
| 2025 | -0.9% | 16.4% |
| 2024 | 24.5% | 23.3% |
| 2023 | -2.3% | 24.2% |
The stock’s move is its own, while its fundamentals are mixed.
This losing streak is largely specific to Aon and other insurance names. Over the same 8 trading days, the S&P 500 returned +1.1%. While notable, the streak’s length is not unique; 13 other S&P 500 stocks are currently on losing streaks of 8 days or more.
The company’s financial metrics show a divided picture against medians for S&P 500 Financials stocks. Revenue over the last twelve months grew 4.9%, below the 10.2% median. However, its operating margin of 28.5% is above the 26.9% median, and it trades at a price-to-earnings multiple of 15.0, also above the median of 13.5.
A streak signals attention, not a trading instruction.
A sustained move in a stock is information. It tells you that other market participants are paying attention, and it reflects momentum. It is not, by itself, a reason to buy or sell.
The disciplined approach is to treat the streak as a prompt to check your own view of the business against the price the market is offering. The numbers here provide a starting point for that work, weighing the stock’s recent performance against the fundamentals of the underlying company.
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.
Prefer the theme to this single name? Our ETF Scorecard shows how the financials funds stack up. Any one of those funds is still a concentrated bet on that one theme, though, which is exactly the gap the portfolio below closes.
Weakness In One Name Should Be Noise, Not News
For a diversified holder, a streak like this is a data point. For a concentrated one, it is a hole in the plan. The difference is never the stock; it is the portfolio built around it.
Building that portfolio is what the Trefis High Quality (HQ) Portfolio does: roughly 30 businesses with the cash generation and balance-sheet strength to absorb a bad month, selected 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. Make the next streak, in either direction, someone else’s drama.