# How to Improve Your Portfolio’s Sharpe Ratio: 5 Levers

> The Sharpe ratio measures return per unit of risk. Here are the five levers that move it, tested before and after on a sample portfolio, and the shortcuts that did not work.

Source: https://www.exent.ai/resources/improve-sharpe-ratio · Reviewed by David, Senior Analyst, Exent · Published Oct 29, 2026 · Updated Oct 29, 2026

## Key takeaways

- You raise a Sharpe ratio by earning more return per unit of volatility, not more return alone. The levers: remove duplicate risk, cap volatile stocks, add low-correlation assets, cut costs, rebalance. Each moved a sample by hundredths.
- Holding cash does not change Sharpe: in a sample backtest, moving 10% into T-bills lowered return and volatility together and left Sharpe at 0.96.
- Bonds helped less than usual: in Exent’s backtest from July 2016 to September 2026, a 60/40 mix had a Sharpe of 0.75 versus 0.88 for the S&P 500, partly because bonds lost money in 2022.
- Optimizers are no shortcut: a max-Sharpe optimizer re-estimated monthly matched the S&P 500’s 0.83 Sharpe from mid-2019, with a deeper drawdown (30.5% vs 23.9%).

## What moves a portfolio’s Sharpe ratio?

Only two things: the return above cash, and the volatility it took to earn it. The [Sharpe ratio](https://www.exent.ai/learn/sharpe-ratio) is (portfolio return − risk-free return) ÷ volatility. The figures on this page calculate it from monthly returns, use 1–3 month Treasury bills (BIL) as the risk-free rate and annualize the result. Unless another source is named, they come from Exent’s data as of Sep 30, 2026.

That gives three routes. Raise return without adding as much volatility. Cut volatility without losing as much return. Or stop paying for things that lower return and add nothing, such as fees and duplicate holdings. Anything that raises return and volatility in the same proportion leaves the ratio where it was. If you care more about losses than swings, the [Sortino ratio](https://www.exent.ai/learn/sortino-ratio) uses only downside volatility.

## What did each lever do to a sample portfolio?

Sample portfolio: 40% SPY, 25% QQQ, 20% Apple, 15% Nvidia. Hypothetical backtest over calendar years 2017–2025, rebalanced every January, computed from yearly returns in the same data, before costs and taxes. Nine yearly returns make this a rough Sharpe estimate; read the direction, not the decimals.

| Version (backtest) | Annual return | Volatility of yearly returns | Sharpe | Worst year |
| --- | --- | --- | --- | --- |
| Before: sample as is | 28.2% | 31.8% | 0.96 | −28.3% |
| Merge QQQ into SPY (remove duplicate) | 26.9% | 29.4% | 0.97 | −24.7% |
| Add 10% gold (GLD) | 27.3% | 29.2% | 0.99 | −25.5% |
| Cap Nvidia at 7.5%, rest to SPY | 24.1% | 26.8% | 0.94 | −25.8% |
| Add 10% T-bills (BIL) | 26.0% | 28.7% | 0.96 | −25.3% |
| Add 10% bonds (AGG) | 25.8% | 29.2% | 0.94 | −26.7% |
| Add 10% long Treasuries (TLT) | 25.5% | 29.7% | 0.92 | −28.5% |
| S&P 500 alone (SPY) | 15.0% | 16.6% | 0.85 | −18.2% |

Two lessons. Every lever lowered the worst year, which may matter more to you than the ratio. And the Sharpe ratio barely moved, because the sample was dominated by one stock with an exceptional run. Improving risk-adjusted return is usually a matter of hundredths, not a transformation.

## Lever 1: Remove risk you are not paid for

Duplicate funds and stock-specific bets add volatility without a reliable reward. Of the 465 largest US stocks with five years of data, only 101 had a higher 5-year Sharpe ratio than SPY to Sep 30, 2026 (today’s largest companies, so survivorship flatters them). Merging QQQ into SPY in the sample nudged Sharpe from 0.96 to 0.97 and cut the worst year by 3.6 points. The step-by-step version is in how to reduce risk without lowering returns.

## Lever 2: Cap the most volatile position

The holding with the largest share of risk relative to its weight is the usual first trim. In the sample, Nvidia was 15% of the money and an estimated 30% of the volatility (see which holding adds the most risk).

In hindsight the cap cost a little Sharpe (0.96 to 0.94), because Nvidia’s own 5-year Sharpe was 1.16 versus 0.69 for SPY. That is the honest catch: capping is a decision about risk you can see today, made without knowing which stock will run. Judge it by the worst year it removed, not by the winner it trimmed.

## Lever 3: Add assets with low correlation

This is the lever that most often raises the ratio, because a low-correlation asset can cut volatility by more than it cuts return. Gold did that here: Sharpe 0.96 to 0.99. Over the same five years, a 5% slice of gold (GLD) lowered an S&P 500 portfolio’s volatility from 15.7% to 15.1%.

Bonds did the opposite in this window. Long Treasuries (TLT) returned −31.2% in 2022, the same year stocks fell, and their 10-year Sharpe was −0.32. In a backtest from July 2016, a monthly rebalanced [60/40 mix](https://www.exent.ai/strategies/sixty-forty) had a Sharpe of 0.75 against 0.88 for the S&P 500. Whether bonds help depends on the inflation and rate backdrop; the do bonds improve Sharpe guide goes deeper.

## Levers 4 and 5: Cut costs and rebalance

**Costs** are the one lever that only works in your favor. A fee or tax drag lowers return one-for-one and leaves volatility unchanged, so every point saved raises Sharpe. Check expense ratios, trading costs and the tax cost of turnover; see how to check fund fees.

**Rebalancing** keeps the risk you chose from drifting upward as winners grow. How often matters less than people think: in the same backtest a 60/40 mix rebalanced monthly had a Sharpe of 0.75 and once a year 0.76. The benefit is control of risk, not extra return.

## What does not improve the Sharpe ratio?

| Idea | What happened | Source |
| --- | --- | --- |
| Hold more cash | Return and volatility fell together; Sharpe stayed 0.96 | Sample backtest above |
| Use leverage | Scales return and volatility up together; borrowing costs then lower the ratio | Definition of Sharpe |
| Max-Sharpe optimizer (36-month lookback) | Sharpe 0.83, same as SPY; max drawdown 30.5% vs 23.9% | Backtest, Jul 2019–Sep 2026 |
| Minimum-variance optimizer | Volatility 5.9%, but annual return 0.7% and Sharpe −0.27 | Backtest, Jul 2019–Sep 2026 |
| Buy the past Sharpe leader | Leaders change; ranking on history rewards luck | See backtest overfitting |

Optimizers chase the inputs they are fed, and past returns are noisy inputs. See the [max-Sharpe](https://www.exent.ai/strategies/max-sharpe) backtest and backtest overfitting.

## How to work on your own Sharpe ratio

- Measure it first, with the risk-free rate, over at least 3 and 5 years.
- Compare with a risk-matched benchmark, not just the S&P 500.
- List each holding’s share of risk next to its weight.
- Change one lever at a time and re-measure, including the worst year.
- Write down why you hold anything that adds more risk than its weight.

More methods are collected under [portfolio optimization](https://www.exent.ai/portfolio-optimization).

## How to measure and test your Sharpe ratio with Exent

1. Upload a screenshot of your holdings, or a CSV, Excel, PDF or Google Sheet; no brokerage login.
2. Exent reports Sharpe, Sortino and Calmar ratios, drawdowns and monthly returns, next to a risk‑matched benchmark.
3. The efficient frontier and correlation clusters show where re‑weighting or a low‑correlation asset could change the ratio.
4. Try one lever at a time in the what‑if simulator and compare the numbers before you trade.

Exent is our product: [Exent portfolio check](https://www.exent.ai/portfolio)

## Frequently asked questions

### What is a good Sharpe ratio for a portfolio?

Compare it with a benchmark over the same period rather than a fixed number. In Exent’s data the S&P 500 (SPY) had a Sharpe ratio of 0.69 over the five years and 0.86 over the ten years to September 30, 2026.

### Does adding bonds increase the Sharpe ratio?

Historically it often did, but not in the decade to September 2026. Exent’s 60/40 backtest had a Sharpe of 0.75 versus 0.88 for the S&P 500, largely because bonds fell sharply in 2022.

### Does holding cash improve the Sharpe ratio?

No. Cash earns the risk-free rate, so adding it lowers excess return and volatility in the same proportion and leaves the ratio about unchanged.

### Can diversification increase the Sharpe ratio?

Yes, when the added asset has low correlation with the rest and a positive return above cash. In a sample backtest, adding 10% gold raised the Sharpe ratio from 0.96 to 0.99.

### Is a higher Sharpe ratio always better?

Not on its own. A high ratio from a short or lucky period says little about the future, and it hides how deep the worst loss was, so check drawdown alongside it.

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Educational content, not investment advice. Past performance does not guarantee future results.