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Portfolio construction
Fewer than you probably think. Three to six funds cover almost every portfolio — one for US stocks, one for international stocks, one for bonds, and maybe one or two more for a deliberate tilt. Past that point, each new fund is usually redundant with one you already own, not a new source of diversification.
Portfolio Lab’s own overlap check maps every ticker it recognizes to one of just 15 real asset-class buckets — across 137 common tickers. Dozens of popular funds land in the same bucket. US large-cap alone absorbs 33 of them:
| Bucket | Examples | Tickers mapped here |
|---|---|---|
| US large-cap stocks | VOO, VTI, SPY, QQQ, and 29 more | 33 |
| US bonds | BND, AGG, VCIT, and 14 more | 17 |
| US small/mid-cap stocks | VB, IJR, VO, and 7 more | 10 |
| International developed stocks | VXUS, VEA, IEFA, and 7 more | 10 |
| Real estate (REITs) | VNQ, SCHH, IYR, and 6 more | 9 |
| Emerging markets stocks | VWO, IEMG, EEM, and 5 more | 8 |
The remaining 9 buckets cover Treasuries by duration, TIPS, gold, commodities, cash, and a small-cap value tilt — 4-7 tickers each. Owning two funds from the same bucket doesn’t add exposure; it splits one bet across two tickers.
The classic “three-fund portfolio” — a US total-market fund, an international fund, and a bond fund — already touches three separate buckets and, for most goals, most of the risk that matters. It’s not a compromise; it’s close to the floor.
Add funds when you’re reaching for a bucket you don’t already have — not when you’re reaching for a different ticker in a bucket you do.
List your holdings and check how many map to the same bucket above. VTI, VOO, and SPY are three tickers and one bucket (see VTI vs VOO) — a common pattern from mixing a 401(k) lineup with an old IRA. More line items there means more rebalancing and more tax-lot bookkeeping, not more diversification.
See your own buckets
Portfolio Lab maps every ticker you hold to its real asset class and flags anything redundant — paste your holdings, no account needed.
Analyze a portfolio →One, for this purpose. It already blends US stocks, international stocks, and bonds inside a single ticker and rebalances itself. If you hold a target-date fund alongside other funds, check whether they overlap with what's already inside it.
Then the job is easier, not harder. Most 401(k) lineups already collapse to 3-5 real choices once you account for overlap — you're picking one fund per bucket you need, not agonizing over a long list.
Not by itself. Risk comes from which buckets you're exposed to and in what proportion, not from the fund count. Ten funds concentrated in one bucket carry the same risk as one.
Educational, not advice. Bucket counts come from Portfolio Lab’s own asset-class mapping and reflect tickers it currently recognizes, not an exhaustive list of every fund that exists.