You have $200 available this month. You want a stake in many businesses without choosing each stock. Two funds own the same basket: one sets your purchase price after the market closes; the other trades throughout the day.
The second sounds more flexible. But trading all day does little for you if your broker cannot buy the amount you want. For a small, regular purchase, minimums and automation may matter more than trading hours.
A share of a shared portfolio
A pooled fund combines many investors' money into one portfolio. Your shares give you a proportional stake in its holdings and their gains or losses. In a stock fund, you own fund shares; the fund owns the company shares.
A mutual fund sells shares to you and buys them back, directly or through a broker. An exchange-traded fund (ETF) has shares that individual investors buy and sell on an exchange. These are two wrappers for a portfolio.
To compare these US-registered funds, use the fictional Market Basket Fund in both wrappers, with identical holdings. It owns many US companies, including Harbor Coffee and Tessel Software, two fictional businesses used throughout these lessons. Give Harbor a 5% weight and Tessel a 4% weight.
That basket spreads company-specific risk, though even a broad stock fund can fall with the market.
What one fund share is worth
Net asset value (NAV) is what the fund owns minus what it owes. Assets include investments and cash; liabilities include unpaid fund expenses.
Divide those net assets by the fund's outstanding shares to get per-share NAV. This is the number a fund page usually labels “NAV.”
Say Market Basket has $1.01 billion in assets, $10 million in liabilities and 100 million shares. Subtracting the liabilities leaves $1 billion. Dividing by 100 million shares gives $10 per share.
With Harbor at 5% of net assets, a $1,000 holding at NAV includes $1,000 × 5% = $50 of indirect Harbor exposure. The ownership diagram follows your stake through the fund. You share in Harbor's performance, but cannot sell that $50 slice separately.
Mutual funds use forward pricing: your order gets the next NAV after it is accepted. Meet the fund or broker's cutoff to get that business day's NAV, usually calculated after the market closes. Miss it and your order waits for the next pricing day.
If the displayed NAV is $10 and the next one is $11, you buy at $11. The displayed price is history, not a price you can lock in. Your ETF trades use the market price when they execute.
What changes with the wrapper
| Feature | Mutual fund | ETF |
|---|---|---|
| Trading | With the fund; once a day | On exchange; during the day |
| Price | Next NAV | Market price |
| Minimum / fractions | Dollar buys; minimum varies | Whole shares or broker fractions |
| Recurring buys | Often available | Broker and fund dependent |
| Costs | Ongoing fees; possible sales charges | Ongoing fees; spread; possible commission |
| US capital-gains payouts | Can be taxable | Often fewer; can still be taxed |
Put $1,000 through each wrapper. For this purchase, you meet the mutual fund minimum, pay no upfront charges or commissions, and your broker trades only whole ETF shares.
- Mutual fund: At the next $10 NAV, $1,000 ÷ $10 buys 100 shares.
- ETF: At a $10.02 ask, 99 shares cost 99 × $10.02 = $991.98. You have $8.02 left in cash.
The $8.02 is unspent cash, not a fee. Fractional ETF purchases could invest more of it. The $10.02 ask is a snapshot; the gap between an ETF's price and NAV can change.
Both wrappers have operating expenses, summarized in the expense ratio. ETF trades also involve a spread; some mutual funds have sales charges, and brokers may charge transaction fees. Zero commission does not mean zero cost.
Where each wrapper fits
For saving a set dollar amount, a mutual fund can make regular purchases and reinvesting payouts convenient. An ETF offers access to trading during the day. You can use that flexibility without making frequent trading part of the job.
Neither wrapper always has the lowest minimum or the best automation. Mutual funds often accept dollar purchases once any minimum is met. ETF fractions and recurring purchases depend on the broker and eligible fund; the broker's rules for fractional holdings explain the limits.
Your $200, fully invested at NAV, would include $200 × 5% = $10 of Harbor exposure. Whether all $200 can get into the fund depends on its initial minimum and your broker's purchase options.
Read the fund's minimum and your broker's exact-dollar and recurring-purchase terms for that fund. Compare costs and account tax treatment among the options that support your routine. If those terms are unclear, the choice can wait.
Read the basket before the label
Two funds in different wrappers can hold almost the same portfolio. ETFs can hold hundreds of businesses, focus on one sector, or tie their performance to a single stock. The letters ETF tell you how the fund trades, not how broad it is.
Read the holdings and objective first, then compare how you buy, hold and sell. Either wrapper can track an index or use a manager's selections. That index-fund decision is the next choice: how the portfolio is built.
In short
- You own fund shares; the fund owns the investments.
- Mutual fund orders get the next NAV; your ETF trades get market prices.
- A useful wrapper supports your amount and routine at costs you understand.
- Either wrapper can track an index or use a manager's selections.
- Holdings determine your investment exposure; the wrapper changes how you own it.