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Institution guide
Any broker, with ETFs
Index mutual funds tie you to the firm that runs them. ETFs do not. Build with broad-market ETFs and your portfolio works the same at Robinhood, M1, Merrill, E*Trade, Vanguard or anywhere else — and moves between them without ever being sold.
An example 60/20/20 mix. Choose your own →
Why portability is worth caring about
When you move a brokerage account, an ETF moves with it. The shares are simply re-registered at the new firm through the standard transfer system — nothing is sold, no gain is realised, no tax is owed. A proprietary index mutual fund cannot do that. Leaving means liquidating, and in a taxable account that means a tax bill chosen for you by a customer service decision you made years earlier.
If everything you own is in an IRA or 401(k), this matters very little. If you have a taxable account you expect to hold for decades, it is the single strongest argument for building in ETFs.
Three families that all work
| Sleeve | ETF | Index tracked | Expense |
|---|---|---|---|
| U.S. stocks | ITOT Core S&P Total U.S. Stock Market | S&P Total Market Index | 0.03% |
| International | IXUS Core MSCI Total International Stock | MSCI ACWI ex USA IMI | 0.07% |
| Bonds | AGG Core U.S. Aggregate Bond | Bloomberg U.S. Aggregate Bond | 0.03% |
| Sleeve | ETF | Index tracked | Expense |
|---|---|---|---|
| U.S. stocks | VTI Total Stock Market | CRSP US Total Market | 0.03% |
| International | VXUS Total International Stock | FTSE Global All Cap ex US | 0.05% |
| Bonds | BND Total Bond Market | Bloomberg U.S. Aggregate Float Adjusted | 0.03% |
| Sleeve | ETF | Index tracked | Expense |
|---|---|---|---|
| U.S. stocks | SPTM Portfolio S&P 1500 Composite | S&P Composite 1500 | 0.03% |
| International | SPDW Developed World ex-US + SPEM Emerging Markets | S&P Developed ex-US / S&P Emerging | 0.03% / 0.07% |
| Bonds | SPAB Portfolio Aggregate Bond | Bloomberg U.S. Aggregate Bond | 0.03% |
All three families are interchangeable in practice. Do not hold two of them at once — overlapping total-market funds add complexity and, in a taxable account, wash-sale headaches, for no diversification benefit at all.
How to trade ETFs without hurting yourself
Use limit orders, not market orders
Set a limit a few cents above the current ask. On a fund this liquid you will almost always fill immediately, and you are protected if something strange happens in the order book.
Avoid the first and last fifteen minutes
Spreads are widest at the open and close, and an ETF's price can drift from the value of its holdings while the underlying market is still settling down. Mid-morning is unremarkable, which is what you want.
Check whether your broker offers fractional shares
Many now do, which removes the leftover-cash problem entirely. If yours does not, expect a small uninvested remainder after each contribution.
Never buy an ETF you cannot describe in one sentence
The ETF wrapper contains both the cheapest broad index funds ever made and some genuinely dangerous leveraged products. The wrapper tells you nothing; the index does.