ETF (Exchange-Traded Fund)
A 1940 Act ETF registers as an open-end investment company or a unit investment trust. Shares trade at a market price that may not equal NAV. Not ETNs or commodity trusts.
An ETF must register with the SEC as a 1940 Act open-end investment company or a unit investment trust. Shares trade at a market price that may or may not equal NAV. This page does not cover ETNs or commodity trusts.
What a 1940 Act ETF is
investor.gov: an ETF is an exchange-traded investment product that must register with the SEC as an open-end investment company or a unit investment trust. It pools money and holds a portfolio — stocks, bonds, short-term instruments, other assets, or a mix — usually managed by an SEC-registered adviser. Each listed share is a slice of that portfolio and of the income it generates. That is a legal wrapper. It is not a reason to own anything.
The same investor.gov page covers 1940 Act ETFs only. It does not address other types of exchange-traded products, such as exchange-traded commodity trusts or exchange-traded notes (ETNs). Do not treat an ETN or a commodity trust as “the same as an ETF” because it prints on an exchange. Those are different products. This glossary follows that scope.
The operator object is a basket that trades as a listed share. You hold the fund share, not each constituent as a separate lot. The basket may be a cap-weight index — a market-capitalisation sort, where the largest names dominate — or equal-weight, sector, factor, bond, or an active ruleset. Name the definition before you name the ticker. “I buy ETFs” is as empty as “I buy stocks.” A growth-stock sleeve is still a growth claim that happens to wear a wrapper.
A mutual-fund share and an ETF share can track the same index and still be different trading problems. The ETF prints through the session. The typical mutual fund deals at end-of-day NAV. That is operational, not a quality ranking. The longer map lives in the ETF and index investing course and the stock courses hub.
Market price may not equal NAV
Shares trade on national exchanges at market prices that may or may not equal net asset value. Premium or discount to NAV is a trading fact, not a rounding footnote. NAV is the fund’s per-share claim on the portfolio: assets minus liabilities, divided by shares. The listed price is what prints. You earn the listed print, not the NAV spreadsheet. See the U.S. session hours 2026 page for clocks. Do not treat overnight as a live exchange session on this term.
ETF shares can be created and redeemed in large blocks against the underlying basket, or against cash when the product’s documents allow it. That plumbing is what usually keeps listed price near NAV. This page will not invent who sits in that plumbing or what they charge. Retail tickets buy and sell the listed share. Creation and redemption are not a button on a $10,000 ticket. When the valve is slow — thin products, stressed tape, awkward open or close — listed price can drift from NAV. That gap is a trading cost at entry and at exit. It is not “the index failed.” TODO:VERIFY creation-unit size and cash-in-lieu rules in the product documents. This glossary will not invent a creation-unit share count or a wholesale fee in basis points.
EXAMPLE — expense ratio is a cost, not a ranking
The expense ratio is the fund’s stated annual operating cost as a fraction of assets, taken from the prospectus. It is a rate, not a ticket commission and not a quality stamp. Cheaper is not automatically better: a low-fee wrapper on the wrong index is still the wrong beta. A cheap fund you buy at a fat premium can still lag the claim you thought you bought.
EXAMPLE (hypothetical drag only — not a named fund, not a fee survey, not a recommendation). Sleeve $10,000. Hypothetical expense ratio 0.40%. Drag ≈ 10,000 × 0.0040 = $40 per year if assets stay $10,000 and the stated ratio is the whole cost. It is not. You still pay spread, premium or discount, and tracking. Do not compound these dollars into a multi-year backtest — that would be an invented path. TODO:VERIFY any real prospectus figure before you journal a fee.
Equity-ETF distributions are a pass-through of the basket’s dividends minus expenses — not a coupon. Do not treat an ETF dividend yield as a remembered hurdle. TODO:VERIFY any yield against the product’s current distribution methodology.
FAQ
Is an ETF the same as a mutual fund?
No. Both can pool money into a portfolio. A 1940 Act ETF must register as an open-end investment company or a UIT and its shares trade on an exchange at market prices during the session. Typical mutual-fund shares transact with the fund at end-of-day NAV. Premiums and intraday liquidity remain different problems even when the published index matches.
Are ETNs and commodity trusts ETFs on this page?
No. investor.gov’s ETF page covers 1940 Act open-end funds and UITs. It does not address exchange-traded commodity trusts or exchange-traded notes. Those products can print on an exchange and still not be the ETF this glossary names.
Why can the listed price differ from NAV?
You trade the listed share. NAV is the fund’s per-share claim on the basket. Market price may or may not equal NAV. Creation and redemption usually pin those two together. In thin products, around the open or close, and in stress, the pin can lag. The gap is a trading cost, not a signal that the index calculation broke.
Does a low expense ratio mean the ETF is better?
No. Expense ratio is a cost you can compute from the prospectus. It is not a ranking. Compare fees inside the same definition, then decide whether you want that definition at all. TODO:VERIFY the live prospectus number; do not journal a remembered blog table.
How should a trader size an ETF position?
The same way as a stock if you are trading it: dollar risk divided by dollar risk per share, round down. EXAMPLE frame: $10,000 account, 1% → $100. Run it on the risk calculator (crypto UI; treat the unit as shares, round down). The wrapper does not make a 40% sleeve “safe.”
Educational only. Not financial, tax, or legal advice. Not a recommendation to buy or sell any security or fund. DennTech Trading Solutions does not provide personalized investment advice. This page covers 1940 Act ETFs only — not ETNs or commodity trusts. Expense figures are labeled EXAMPLE or marked TODO:VERIFY.