Sharpe Ratio Explained: Risk-Adjusted Returns That Matter
A 20%-in-one-quarter stock isnt automatically a good investment if the ride there was brutal. Heres how the Sharpe ratio measures return against turbulence.

NVDA ranks #1 of 33 · score 70. These 3 lead the sector:
- 1NVDANVIDIA CorporationAACDBB70
- 2TSMTaiwan Semiconductor Manufacturing Company LimitedAACCBB70
- 3OLEDUniversal Display CorporationDBBBCB68
Key Takeaways
- The Sharpe ratio measures return earned per unit of risk taken, not just raw return
- It's calculated as (portfolio return − risk-free rate) divided by the standard deviation of returns
- A high-flying, volatile stock can post a worse Sharpe ratio than a boring, steady one over the same period
- The metric penalizes upside volatility the same as downside volatility, which is one of its biggest blind spots
- It works best for comparing similar strategies over similar timeframes, not as a single absolute score
A stock that gains roughly 20% in a single quarter isn't automatically a good investment — not if the ride there was brutal. That's exactly the gap the Sharpe ratio is built to catch.
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