Open Finance Academy

Investing and portfolio management

Learn how to connect investments to a goal, spread risk, compare funds, measure results, and maintain a portfolio as circumstances change.

← All knowledge areas · Glossary

No investing experience is needed. Familiarity with percentages helps; Money and financial fundamentals introduces them alongside interest and risk. New finance terms are bold, explained on first use, and linked to the glossary. Each glossary entry links back to its explanation here.

Example assumptions

All dollar amounts, returns, and fees are invented teaching examples. Portfolio percentages illustrate calculations, not a recommended allocation. Unless a section says otherwise, assume a one-year period, no borrowing, taxes, fees, deposits, or withdrawals, and all investment payments reinvested. Returns include both changes in value and reinvested payments. We allow fractional holdings and round displayed results; actual prices and returns are uncertain. The steady growth used in the fee example is a mathematical assumption, not a forecast.

In this lesson

  1. Begin with a goal
  2. Understand what you own
  3. Spread risk across a portfolio
  4. Compare funds and strategies
  5. Measure results consistently
  6. Rebalance with a purpose
  7. Understand fees and taxes
  8. Research before committing money
  9. Make a plan you can follow
  10. Check your understanding

Begin with a goal

Alex has money for a course starting next year and separate savings for a goal fifteen years away. A sharp fall just before tuition is due could make the course unaffordable. The distant goal allows more time to respond, although extra time cannot guarantee recovery from losses.

Investing means committing money to assets in pursuit of future income or growth, accepting uncertainty and possible loss. A portfolio is the collection of investments held together. Managing it starts with the purpose of the money.

A time horizon is the time until money is needed. Risk is uncertainty about a financial outcome, including losing money or falling short of a goal. Risk tolerance describes willingness to accept losses; risk capacity describes the financial ability to absorb them. Alex could feel comfortable with a large loss but still be unable to pay tuition after one.

Liquidity means how readily something can become spendable money without a large loss in value. A readily traded investment can still have an unstable price. Consider access and potential losses separately. See Investor.gov on risk tolerance and investment timeframe.

Write down the goal, amount needed, date, and how much shortfall would be manageable before comparing products. Account for essential spending and unexpected cash needs when deciding what money is available to invest.

Understand what you own

A stock is an ownership interest in a company. A dividend is a distribution to shareholders, often in cash. Both the share price and any dividend can change; dividends are not promised. See Investor.gov’s stock introduction.

A bond is a debt investment: its issuer promises payments under stated terms. The issuer might fail to pay, and a bond’s resale price can fall. For many ordinary fixed-payment bonds, rising market interest rates reduce the attractiveness and price of older bonds paying less. Holding a bond does not make every possible loss disappear. Explore Investor.gov’s investment product resources.

Cash and bank deposits serve a different role from ownership in a company. Access conditions and any deposit protection depend on the provider, product, and country. Money held in a bank account should not be assumed equivalent to every investment product with “cash” in its name.

Spread risk across a portfolio

An asset class is a broad category of investments with similar features, such as stocks or bonds. Asset allocation is the division of a portfolio across these categories. Diversification spreads investments across different holdings and sources of risk so the outcome depends less on any one of them.

For arithmetic practice, give Alex’s long-term portfolio a $10,000 starting value:

Holding Starting amount Share of portfolio
Broad stock holdings across companies and industries $6,000 $6,000 ÷ $10,000 = 60%
Bond holdings across several issuers $4,000 $4,000 ÷ $10,000 = 40%
Total $10,000 100%

Different names do not always mean different risks. Several funds may own the same large companies; several companies may depend on the same industry. Inspect underlying holdings. Diversification can reduce dependence on one company, but many investments can fall together. Investor.gov explains allocation and diversification.

A loss scenario

Suppose stocks lose 20% and bonds lose 10% over a year:

The mix lost less than the stock portion alone in this scenario, but still lost $1,600. Different outcomes could make the mix perform better or worse relative to either part. Nothing in this calculation establishes 60/40 as the right allocation for Alex or anyone else.

Compare funds and strategies

An investment fund pools money from investors and buys holdings according to a strategy. The fund’s structure and its strategy answer different questions.

Structure How it works
Mutual fund For an ordinary open-end fund, investors buy or redeem shares at the next calculated value of net assets per share, generally calculated each business day, with applicable fees.
Exchange-traded fund (ETF) Shares trade on an exchange during the trading day. Their trading price can differ from the underlying net asset value per share.

These descriptions follow the ordinary U.S. fund structures in Investor.gov’s mutual fund and ETF comparison, consulted September 13, 2026. Product and tax rules differ elsewhere. Neither structure tells you whether the investments are broad, narrow, inexpensive, or appropriate for a particular goal.

A market index measures the performance of a selected group of investments using stated rules. An index fund seeks to track one of these indexes. This is a form of passive investing: following a specified market exposure instead of choosing investments to beat it. Costs and implementation can make fund results differ from index results. You cannot buy an index itself. See Investor.gov on index funds.

Active investing uses investment judgments to select or change holdings, often aiming to outperform a comparison measure. Both mutual funds and ETFs can be active or passive. A narrow industry index can be concentrated; an active fund can be diversified. Compare the actual strategy and costs rather than treating a label as a quality guarantee. FINRA’s fund guide discusses strategies and costs.

Measure results consistently

A return is an investment’s gain or loss over a stated period, including payments received and changes in value. Suppose a separate $100 share ends the year worth $104 and pays a $2 dividend that you hold as cash rather than reinvest:

Total gain = $104 ending share value − $100 starting value + $2 dividend = $6.

Return = $6 ÷ $100 × 100 = 6%.

Looking only at the share price would report 4% and miss the dividend. If an ending account value already includes the dividend, do not add it again. FINRA explains return calculations.

A different portfolio scenario

Start again from the original $10,000 allocation, independently of the loss example. Suppose the stock holdings return +10% and the bond holdings −5% over the same year:

Holding Calculation Ending value
Stocks $6,000 × 1.10 $6,600
Bonds $4,000 × 0.95 $3,800
Total $6,600 + $3,800 $10,400

Portfolio return is ($10,400 − $10,000) ÷ $10,000 = 4%. You can also weight each return by its starting share: 0.60 × 10% + 0.40 × (−5%) = 4%. The simple average, 2.5%, is incorrect because the starting amounts differ.

Deposits are not investment gains. If an account starts with $10,000, earns nothing, and receives $1,000 at year-end, its $11,000 balance does not imply a 10% return. When money enters or leaves during the period, performance calculations must account for its timing.

A benchmark is a reference for evaluating performance. Choose one reflecting the strategy and risks, then compare the same period, currency, treatment of payouts, and treatment of fees. A mixed stock-and-bond portfolio should not be judged solely against an all-stock index. Review multiple periods and the losses experienced along the way; a recent winning year is not a forecast.

Rebalance with a purpose

After the +10% stock / −5% bond scenario, the stock share is $6,600 ÷ $10,400 = about 63.46%, above the original 60% target.

Rebalancing adjusts holdings back toward a chosen allocation. To restore this example’s 60/40 mix without adding or removing money:

Total value stays $10,400 under our no-cost assumptions. The purpose is to restore the intended risk mix, not predict which holding will win next. New deposits can also help move an allocation toward its target without selling existing holdings.

A plan might review allocations at stated intervals or after they drift beyond a chosen range. Actual trades can incur costs and taxes, so a review need not produce a trade. Revisit the target itself when goals or circumstances change. See Investor.gov’s rebalancing guide.

Understand fees and taxes

A fund’s expense ratio expresses annual operating expenses as a percentage of average net assets. At a constant $10,000 balance, 0.20% is roughly $20 a year, while 1.20% is roughly $120. Fund expenses are normally deducted within the fund, not necessarily billed separately. Account fees, advice charges, and trading costs may be additional. See Investor.gov’s fund fee guide.

A simplified ten-year fee comparison

Assume both hypothetical investments earn exactly 5% each year before costs. For this calculation only, charge the annual fee on each year’s starting balance and deduct it at year-end. Real funds use different accrual mechanics. No taxes, deposits, withdrawals, or other charges apply; carry full precision until rounding the final result.

Annual fee assumption Annual growth after the assumed fee $10,000 after ten years
0.20% of starting balance 5% − 0.20% = 4.80% $15,981.33
1.20% of starting balance 5% − 1.20% = 3.80% $14,520.23

For the first row, multiply $10,000 by 1.048 ten times; for the second, multiply by 1.038 ten times. The difference is $1,461.10, reflecting both charges and the growth forgone on money no longer invested. Lower fees do not by themselves establish comparable risk or better future results. Investor.gov illustrates the cumulative effect of investment costs.

Taxes can apply to investment payments and sales, depending on the country, account, and personal circumstances. Compare applicable account and product rules; this lesson assumes no particular tax rate or tax advantage.

Inflation is a rise in the general level of prices. A real return adjusts investment performance for that change in purchasing power. With 4% growth after fees and 3% inflation for the same year, (1.04 ÷ 1.03) − 1 = about 0.97% real growth, before any taxes. Revisit the fundamentals lesson’s explanation.

Research before committing money

Due diligence means investigating an investment’s features, risks, costs, and supporting information. A prospectus is a formal disclosure document describing an investment offering, including objectives, risks, costs, and terms. Requirements vary by product and country. Start with official documents and independently verified provider information. Investor.gov explains investment research.

For a fund, ask what it owns, whether holdings overlap your other investments, how it could lose money, what all-in costs apply, and how you can sell or withdraw. For a company, examine its business, obligations, and financial statements. The accounting lesson shows how profit and cash can tell different stories.

Valuation estimates what something is worth using assumptions about future benefits and risk. Price is what someone asks or pays; an estimate of value can differ. As FINRA’s stock evaluation guide explains, evaluating an investment requires looking beyond a price alone.

Consider an asset that pays exactly $105 in one year and has no value afterward. Its present value is today’s equivalent under a chosen discount rate, the rate used to work backward from a future amount. At an assumed 5%, $105 ÷ 1.05 = $100. At 10%, $105 ÷ 1.10 = about $95.45. The estimate changes with the assumption; uncertain cash payments require further analysis. This is the time-value calculation from the fundamentals lesson.

Promises of high returns without risk, pressure to act immediately, or unverifiable sellers are reasons to investigate carefully. Use the Investor.gov fraud warning checklist. Registration does not guarantee investment performance.

Make a plan you can follow

A behavioral bias is a recurring distortion in judgment. Examples include seeking only evidence supporting a purchase, assuming recent winners will keep winning, and becoming overconfident after a few successful decisions. The SEC’s investor behavior bulletin describes patterns that can undermine results.

A short written plan can record the goal, time horizon, intended allocation, acceptable costs, and review rules. Before acting on a headline, compare the proposed change with that plan. A changed goal or new evidence can justify a change; a price movement alone does not explain whether the investment still fits.

Check your understanding

Try these before reading the answers. Each numerical question is independent and uses the no-cost assumptions unless stated otherwise.

  1. Alex enjoys taking risks but cannot afford to lose next year’s tuition. Which matters here: risk tolerance, risk capacity, or both?
  2. A $10,000 portfolio starts with $6,000 in stocks and $4,000 in bonds. Stocks lose 20% and bonds gain 5%. What is the ending value and portfolio return?
  3. Why might three funds provide less diversification than their number suggests?
  4. A portfolio now holds $6,600 in stocks and $3,800 in bonds. How much moves between them to restore 60/40, with no new deposits?
  5. A share starts at $200, ends at $190, and pays $6 held separately as cash. What is its total percentage return?
  6. At a constant $20,000 balance, approximately how much is a 0.25% annual expense ratio? Does that necessarily cover every investing cost?
  7. An account starts at $5,000, receives a $500 deposit at year-end, and ends at $5,500 without any other activity. What was its investment gain?
  8. Is every ETF an index fund? Does following an index guarantee broad diversification?

Answers

  1. Both matter, and capacity constrains the decision. Alex’s willingness to take a loss does not provide the money needed for tuition if that loss occurs.
  2. $9,000 and −10%. Stocks: $6,000 × 0.80 = $4,800. Bonds: $4,000 × 1.05 = $4,200. Total: $9,000. Return: ($9,000 − $10,000) ÷ $10,000 = −10%.
  3. Their underlying holdings can overlap. Three funds concentrated in the same companies or industry can depend on similar outcomes. Count sources of risk, not only product names.
  4. Move $360 from stocks to bonds. Total value is $10,400. Targets are $6,240 stocks and $4,160 bonds; $6,600 − $6,240 = $360.
  5. −2%. Total gain or loss is $190 − $200 + $6 = −$4. Divide −$4 by $200 to get −0.02, or −2%. The payment offsets part of the price loss.
  6. About $50 a year. $20,000 × 0.0025 = $50. Trading, advice, or account costs may be additional; the actual fee depends on the fund’s asset values through the year.
  7. Zero. The entire $500 increase came from Alex’s deposit, not investment performance.
  8. No to both. ETF describes a structure that can support active or passive strategies. An index can track a narrow industry, so an index fund is not automatically broadly diversified.

Terms introduced in this lesson

Follow a definition to revisit its meaning and find links back to the sections above.

Keep learning

Use Accounting and financial analysis to practice reading financial statements, or Personal finance and financial wellbeing to connect investing with household cash needs and goals.

Financial markets and instruments explains investment products, market quotes, order types, and derivative risks. Find reading resources on Books and professional study pathways on Certifications.

Planned follow-up lessons