Chapter 4: Reading a fund page in five minutes
Mara is 36, a pharmacist with $310,000 spread across five accounts left over from job changes. This spring she finally logged into a 401(k) from two employers ago and found two US stock funds sitting side by side. They held nearly the same companies in nearly the same weights. One charged 0.95% a year. The other charged 0.04%. Nothing was hidden. Both numbers had been printed on the fund pages the whole time, surrounded by forty other numbers that mattered far less.
The crowd of numbers is the real obstacle. At year-end 2025 there were 4,813 ETFs and 8,030 mutual funds registered in the US (ICI 2026 Fact Book), and every one of them publishes a page thick with statistics, ratings, and charts that start at flattering dates. You do not need most of it. Five lines tell you whether a fund deserves your money, and reading them takes about five minutes once you know where each one lives.
The five lines, in reading order
- Expense ratio: what owning the fund costs each year.
- What it holds: the index or strategy behind the name.
- Size and age: whether the fund is likely to still exist in ten years.
- Bid-ask spread (ETFs only): what getting in and out costs.
- Tracking difference (index funds): whether it delivered what it promised.
Run them in this order, because the order matches how often each line settles the verdict. Most bad funds fail on line 1, and you never reach line 3.
Line 1: the expense ratio
The expense ratio is the slice of your money the fund keeps every year, taken automatically out of the fund's value. A 0.04% ratio costs $4 a year per $10,000 invested; 0.95% costs $95 per $10,000. Chapter 5 spends its whole length on this number, so here is only the reading rule: broad total-market index funds are available for 0.03% a year (Vanguard's total-market ETF, per its SEC filing), so under 0.10% is the normal neighborhood for broad index exposure, and anything above 0.50% has to explain what it does that a 0.03% fund cannot. Cost is the rare statistic on the page that predicts the future, because it is subtracted from your return with certainty every year.
Line 2: what the fund actually holds
The name is marketing. The holdings are the product. Every fund page names the index it tracks or summarizes the strategy it runs, and lists its top ten holdings. Read both, because funds with similar names can hold very different things, and funds with different names can hold nearly identical things, which is exactly what Mara found in her old plan.
The label did get more honest recently. Under the SEC's Names Rule, adopted in September 2023 and fully in force for every fund as of this month, June 2026, a fund whose name suggests a focus must invest at least 80% of its assets accordingly, reviewed quarterly. That is real progress and a weak promise at the same time. The 80% is a floor, the other 20% is leash, and a vague name like "Strategic Growth Opportunities" promises nothing measurable in the first place. The rule limits a name; it does not bless one.
Line 3: size and age
AUM, assets under management, is the total money inside the fund, and the page lists it next to the launch date. Together they answer a question beginners rarely think to ask: will this fund still exist when you need it? A broad index fund holding tens of billions and running for decades is settled infrastructure. A two-year-old fund with a thin sliver of assets is an experiment, and sponsors shut down experiments that cannot cover their own costs. Fund closures are routine industry housekeeping, and the funds that get swept up are nearly always small, young, and narrow.
What happens if a fund you own closes?
You get your money back, with a chore attached. The sponsor announces a liquidation date in advance, sells the holdings, and sends shareholders cash at the final per-share value. Nothing is stolen, and nothing goes to zero just because the fund wraps up. The cost is hassle: in a taxable account the closure forces a sale you did not choose, which can trigger a tax bill on your gains at an awkward time, and either way your money sits in cash until you pick a replacement and reinvest. That is why line 3 exists. Closure risk is hassle risk rather than loss risk, but a fund too small and too new to trust with the next decade fails the checklist anyway. You are choosing a container for years of savings, and the container should outlast the plan.
Line 4: the bid-ask spread
This line applies to ETFs, which trade all day like stocks. At any moment an ETF has two prices: the bid, what buyers are offering, and the ask, what sellers are asking. The gap between them is the bid-ask spread, and you pay it every time you trade, on top of the expense ratio. On large broad funds the spread is pennies. The $0.02 spread in Figure 4.1, on a $112 share, is about 0.02% of your money for a full round trip, small enough to ignore. On small or specialized funds the spread widens into real money, and a fund that costs 0.40% to enter and exit has quietly handed you a year's worth of someone else's expense ratio before your investment does anything at all. The Finvest Stocks Guide walks through quote and spread mechanics in its Chapter 3; for this checklist the test is one division: spread divided by price is the toll per trade. Mutual funds skip this line entirely, because they trade once a day at NAV, one reason they remain comfortable defaults inside 401(k) plans (Chapter 2).
Line 5: tracking difference, the one honest test
An index fund has an exact job description: deliver the index's return, minus the fee. So the one honest test of an index fund is the tracking difference, the gap between the fund's return and its index's return over the same period, and the fund page prints both lines for you. If the index returned 10.0% and a fund charging 0.05% returned 9.94%, the gap is 0.06 points: the fee plus a rounding crumb. Pass. If a fund charging 0.40% returned 9.10% against the same index, the gap is 0.90 points, and 0.50 points of your money vanished into sloppy execution beyond the stated fee. Fail, and a telling one, because matching an index is the one job in investing that is supposed to be hard to do badly.
Notice what this line replaces. You are not judging the fund by its raw return, which mostly reflects what its market did. You are comparing the fund with its own promise, which is the only comparison it cannot spin.
The card
- Expense ratio. Under 0.10% passes for broad index exposure; over 0.50% must explain itself (Chapter 5).
- Holdings. The index or strategy is named, the top ten holdings match the label, and you can say what you own in one sentence. The Names Rule guarantees only 80%.
- Size and age. Big enough and old enough that closure is unlikely. Tiny and new is hassle risk you did not need to take.
- Spread (ETFs only). Spread divided by price rounds to a few hundredths of a percent on a broad fund. Anything wider is a toll on every trade.
- Tracking difference (index funds). The fund trails its index by roughly the fee and no more, in every period shown.
Mara's ten minutes
Mara ran the five lines on both funds the same evening she found them. The 0.95% fund failed line 1 on sight, but she kept going to be fair. Line 2: its top ten holdings overlapped the cheap fund's top ten almost name for name. Line 3: both funds were large and a decade old, pass. Line 4: skipped, since both are mutual funds trading at NAV inside the plan. Line 5: the expensive fund had trailed the very index it was hugging, in every period shown on its own page, by roughly its fee. Ten minutes, and the swap was obvious: the same basket for $91 a year less per $10,000. Because the exchange happens inside a 401(k), it triggers no tax bill (Chapter 2). She filed the order that night and saved the larger question, whether any active fund earns its price, for Chapter 6.
Where people go wrong
Choosing by stars and past returns. Ratings and five-year return tables describe the past, and the past does not hold its shape: SPIVA's persistence scorecard finds that funds in the top half of their category rarely stay there, at rates below what coin-flipping would produce. Chapter 6 lays out that evidence; for now, treat a glowing return table as weather, not climate.
Choosing by name. The Names Rule caps the mismatch between label and contents at 20% of assets, which still leaves room for surprises, and it cannot make a vague name specific. Read the holdings. A name is a weak promise even now that it is a regulated one.
Ignoring the spread on a small fund. The expense ratio is printed in bold while the spread hides in the quote, so a trendy thematic ETF can advertise 0.65% a year and then charge another half percent per round trip in spread. Half a percent of trading toll equals more than a decade of a 0.03% fund's annual cost, paid in an afternoon.
Reading all forty numbers. The rest of the page exists for professionals, journalists, and the fund's own marketing department. More numbers do not mean more certainty; they mostly mean more reasons to postpone a decision the first five lines already made. Read five, decide, stop.
Before buying any fund, run the five lines in order: cost, contents, size, spread, tracking. A good broad index fund passes all five in about five minutes. A fund that fails line 1 needs an extraordinary story from the other four, and almost none have one.
Key takeaways
- Five lines decide a fund: expense ratio, holdings, size and age, bid-ask spread (ETFs), and tracking difference (index funds). Everything else on the page is commentary.
- The Names Rule (SEC, adopted September 2023, fully in force June 2026) makes a fund put at least 80% of assets where its name points, checked quarterly. A floor, not a blessing: read the holdings anyway.
- Tiny young funds close routinely. Closure returns your cash at the final per-share value, so it is a hassle and a possible tax event, never a theft.
- The spread is a toll per trade: pennies on big broad funds, real money on small ones. Divide spread by price before you buy any ETF.
- Tracking difference is the one honest test of an index fund: it should trail its index by the fee and nothing more. Mara's two near-identical funds differed by $91 a year per $10,000, and the checklist found it in ten minutes.
Sources: ICI 2026 Fact Book · Investor.gov on ETFs · Investor.gov on mutual funds · SEC Names Rule press release · SPIVA U.S. Persistence Scorecard · Finvest Stocks Guide