Portfolio
A portfolio is the full collection of assets and positions you hold, viewed together for risk and performance.
It is easy to think trade by trade. But your account does not feel each trade separately — it feels them all together. A portfolio is everything you hold, viewed as one whole. Looking at the whole shows risks that single positions hide, such as five trades that are really one bet.
- Category
- Accounting, Tax and Operations
- Reading time
- 4 min
- Also called
- Investment portfolio, Trading portfolio, Holdings
- Updated
A portfolio in plain words
Your portfolio is every position you hold: shares, funds, bonds, cash, crypto, futures or options.
How you split it across types of assets is your asset allocation, usually shown as percentages of the total portfolio.1 Holding different asset classes raises the chance that some holdings do well when others do not.1
Viewing the portfolio as a whole shows your total Exposure and Drawdown, not just the result of one trade. See Portfolio Allocation and Diversification.
How to manage a portfolio, step by step
List every holding
Include all accounts, cash and open trades with their current values.
Calculate weights
Weight = holding value ÷ total portfolio value.
Set a target allocation
Decide what percentage belongs in each asset class.1
Check concentration
Look for one asset, sector or theme dominating the total; holdings that move together add up to one large risk.1
Measure total risk
Add up the risk of all open positions, not just each trade separately.
Rebalance
Adjust holdings regularly to stay near your target allocation.1
Worked examples
Example 1 — Portfolio weights
60 / 25 / 15Your portfolio is $20,000: $12,000 in shares, $5,000 in bonds and $3,000 in cash.
| Shares | $12,000 ÷ $20,000 = 60% |
| Bonds | $5,000 ÷ $20,000 = 25% |
| Cash | $3,000 ÷ $20,000 = 15% |
Expressing holdings as percentages of the total is how asset allocation is usually described.1
Example 2 — Hidden concentration
−10% from one themeYou hold four tech stocks, each $2,500, in a $20,000 portfolio. Tech falls 20%.
| Tech exposure | 4 × $2,500 = $10,000 = 50% |
| Loss | $10,000 × 20% = $2,000 |
| Portfolio impact | $2,000 ÷ $20,000 = −10% |
Four positions behaved like one. Holdings in the same subclass do not diversify each other.1
Example 3 — Rebalancing
Sell $480, buy bondsTarget is 60% shares / 40% bonds on $10,000. Shares rise to $7,200; bonds are $4,000.
| New total | $7,200 + $4,000 = $11,200 |
| Share weight | $7,200 ÷ $11,200 ≈ 64.3% |
| To restore 60% | $11,200 × 60% = $6,720 → sell $480 of shares |
Rebalancing brings the portfolio back to its target allocation.1
Single position vs. portfolio view
| Aspect | Single position | Portfolio view |
|---|---|---|
| Question asked | Is this trade working? | How is all my money doing? |
| Risk measured | Loss to this stop | Combined loss if related trades fail |
| Shows concentration | No | Yes |
| Performance | Trade P&L | Total return and drawdown |
When to think in portfolio terms
Several open trades
Check whether they share the same risk.
Long-term investing
Set and keep an asset allocation.
Market shocks
See how a broad fall hits everything at once.
Performance review
Judge results on the total, not on best and worst trades.
Advantages and disadvantages
Advantages
- Shows your true total risk.
- Reveals concentration and correlation between holdings.
- Supports diversification and rebalancing decisions.
- Gives one honest performance number.
Disadvantages
- Needs data from every account to be accurate.
- Correlations can change in a crisis.
- Rebalancing can create costs and taxes.
- Too many holdings can be hard to monitor.
Going deeper
Read as far as you need. Each level builds on the one before it.
Weights
Beginner
Each holding’s weight is its value divided by the total. Asset allocation describes those weights by asset class.1
Diversification and correlation
Intermediate
Different asset classes react differently to events, which can steady results.1 Assets with high Correlation do not spread risk much.
Portfolio-level risk
Advanced
Active traders should cap total open risk, not just Risk per Trade. A portfolio piled into one type of investment carries more risk.2 Regular Rebalancing keeps the risk you chose.1
Common mistakes
Ignoring correlation
Treating several similar positions as separate risks.
Forgetting other accounts
Leaving out holdings held elsewhere.
Never rebalancing
Letting winners grow until they dominate the portfolio.
Over-diversifying
Holding so many positions that none can be tracked properly.
Check your understanding
Test yourself before moving on. Each answer comes with an explanation.
Key points to remember
- A portfolio is everything you hold, viewed together.
- Weights show how much each holding matters.
- Correlation decides how much diversification helps.
- Total open risk matters more than any one trade.
- Rebalancing keeps the allocation you chose.
Frequently asked questions
Is cash part of my portfolio?
How many positions should a portfolio have?
Is a trading account a portfolio?
Further learning
- Portfolio Allocation
Choosing how to split the portfolio.
- Diversification
Spreading risk across holdings.
- Rebalancing
Returning to target weights.
- Correlation
How holdings move together.
Sources
This article is written in our own words. The sources below support the specific facts, rules and figures marked with a number in the text. Links open the original publisher’s page.
- FINRA. Asset Allocation and Diversification (opens in a new tab) Checked .
- SEC (Investor.gov). Investor Bulletin: Behavioral Patterns of U.S. Investors (opens in a new tab) Checked .
Read more elsewhere
- Trading Metrics (our sister site): Portfolio Metrics (opens in a new tab)
Educational content, not financial advice. Examples use hypothetical prices and simplified costs; actual fees, margin rules and regulations vary by broker, market and country. Trading Metrics is our sister site, under the same ownership; we are not affiliated with any other publisher linked above. Last reviewed . Report an error or request a source credit.