Direct Indexing a Custom Index: Who Lets You Pick the Benchmark

Only one category of provider will direct-index a benchmark you define yourself, and it is not the self-serve apps. Wealthfront, Fidelity, Schwab and Frec all sell fixed menus: you pick from their list, then subtract names you do not want. Genuine custom benchmarks, including blends you design and indices nobody publishes, live with institutional managers such as Parametric Custom Core, which are sold only through a financial advisor. So the real question is not "which platform is best" but "does my mandate fit a menu, or does it need a manager".

That distinction gets blurred constantly, because every provider in this market uses the word "custom". Below is what each one actually means by it, checked against each firm's own published material in August 2026. This is educational content, not investment advice, and none of these firms pays us anything.

Which platforms let you direct-index a custom index rather than only the S&P 500?

The word "custom" is doing three different jobs

When somebody says they want a custom index, they usually mean one of three things, and the three have wildly different price tags.

The first is subtraction. You want the S&P 500 but without your employer's stock, or without tobacco, or without the three companies you have a personal objection to. Every direct indexing product on the market does this, because it is the entire reason direct indexing exists. You do not need a custom benchmark for it. You need an exclusion list applied to a standard one.

The second is reweighting. You want the S&P 500 but capped at 3% per name, or tilted toward dividend payers, or with the technology sector held at half its index weight. This sits in the middle. Some retail platforms allow it within limits, and the limits are published.

The third is a genuinely different index. You want to hold the 60 companies that fit a thesis you wrote, weighted the way you decided, rebalanced on your schedule. That is not a customization of anything. It is a new index, and almost nobody in the retail market will manage money against one.

Most people asking about custom direct indexing want the first or second and can be served cheaply. The people who genuinely want the third are the ones being quietly misdirected, because the marketing language for all three is identical.

What the self-serve platforms will and will not bend

Frec is the most flexible of the automated providers, and it publishes its ceiling precisely: "You can add, remove, or adjust the weights of up to 25 stocks. You can also remove or adjust the weights of up to 5 sectors for all indices except for the S&P 500 Information Technology Index and the MVIS US Listed Semiconductor 25 Index." Twenty-five names is a lot of latitude. Starting from Frec's Russell 1000 strategy and editing 25 positions gets you meaningfully far from the benchmark, and you can do it without speaking to anyone. The full fee, minimum and harvest-rate table for all 25 strategies is on our Frec direct indexing breakdown.

Fidelity is the most restrictive and also the clearest about it: "You may exclude up to five individual stocks or two industries in your account." Five is enough to remove an employer and a handful of objections. It is not enough to reshape a portfolio. Details are on our Fidelity Managed FidFolios review.

Schwab sounds the most generous and is the hardest to plan around. It says "you have the ability to exclude individual securities, or even entire industries," then adds that "the extent to which holdings can be personalized is subject to investment management guidance." No published number. If a specific exclusion is the reason you are opening the account, ask before you fund it, not after. Schwab also has a quirk worth knowing: there is no S&P 500 strategy in the program at all, as covered in our Schwab Personalized Indexing breakdown.

Wealthfront is the narrowest by design. S&P 500 Direct holds the S&P 500. That is the product. It is also the cheapest stock-level direct indexing in the US at 0.09% from $5,000, so narrowness is the trade being made, and for a lot of people it is the right one.

Where real custom benchmarks live

If your mandate genuinely does not fit a menu, the answer is an institutional separately managed account, and in practice that means Parametric. Its Form ADV states that Custom Core "can be benchmarked to any standard or customized index, including but not limited to the S&P 500, the Russell 1000, MSCI EAFE and Bloomberg Barclays Intermediate U.S. Corporate Bond." The phrase "or customized" is the one that matters, and no self-serve platform's documentation contains an equivalent.

The catch is access. There is no retail sign-up. Parametric's standard schedule prices Custom Core Equity (Domestic) at 35 bps with a $250,000 account minimum, but the fee is explicitly negotiable and the manager fee is not the whole cost: bought through Morgan Stanley Select UMA the strategy minimum drops to $25,000 while platform advisory fees stack on top of Parametric's own. We work through both minimums and the full fee stack on the Parametric Custom Core fees and minimums page.

Frec makes a claim about this landscape that is worth repeating because it is roughly right. In a disclosure dated May 22, 2026 it describes itself, Wealthfront and Fidelity as "the only known fully automated US retail providers of direct indexing," adding that "all other providers require interactions with a human advisor prior to investing." Schwab belongs on that automated list too, but the structural point holds: the fully automated tier is small, and everything outside it involves an advisor relationship with its own fee.

Which automated direct indexing platforms work without an advisor?

Four, as of August 2026: Wealthfront, Frec, Fidelity Managed FidFolios and Schwab Personalized Indexing. All four let an individual open and fund an account online with no advisory relationship. Everything else in direct indexing, including Parametric, Aperio and Vanguard Personalized Indexing, reaches you through an intermediary. Our direct indexing platforms comparison puts the fees, minimums and benchmark menus of the self-serve four side by side.

The advisor question is not just about convenience. An advisory fee is typically the largest line in the total cost, often larger than the direct indexing manager fee it sits on top of. Someone comparing Parametric's 35 bps to Wealthfront's 9 bps and concluding the gap is 26 basis points has left out the layer that actually decides the answer.

What to do if your index does not exist yet

There is a middle path that gets overlooked. You do not have to hand a custom benchmark to a manager on day one. You can specify it, test it, and only then decide whether it is worth paying somebody to run.

Start from the thesis rather than from a provider's menu. If the idea is "the companies that supply the grid build-out" or "profitable mid-cap software," the work is turning that sentence into a defensible list of tickers and weights, which is a research problem before it is an implementation problem. Tools that turn an investment thesis into a screened, fundamentals-backed shortlist shorten that step considerably.

Then decide the construction. Equal weight, cap weight, capped cap weight and fundamental weighting produce very different portfolios from the same list of companies, and the choice matters more than most people expect. Our guide to index construction and weighting schemes covers the trade-offs. Once the rules are written down, backtest the construction against real market history and see how it behaved against the benchmark you would otherwise have bought. If you are weighing which analysis tool to run that test in, we compare the options on our PortfoliosLab alternatives page.

A large share of custom index ideas do not survive that step, which is the point of doing it before committing capital or hiring a manager. The ones that do survive arrive at the advisor conversation as a specification rather than a vague preference, and that conversation goes very differently.

Can you build a custom crypto index?

Not through any of the providers above, all of which are equity and fixed income only. The crypto index funds that do exist are all market-cap weighted, which means they are overwhelmingly one asset: Bitcoin sits around 72% to 77% of every major crypto index product, so "diversified crypto exposure" mostly is not. If you want a different weighting, you are building and holding it yourself. We cover the published funds and their construction on our crypto index page.

The short version

If you want the S&P 500 minus a few names, use the cheapest automated platform that offers your index and apply exclusions. If you want to reweight substantially, Frec's 25-stock and 5-sector allowance is the most generous self-serve option published. If you want an index that does not exist, you need an institutional manager and therefore an advisor, and you should specify and test the index yourself before you go looking for one.

The mistake to avoid is paying advisor-tier prices for menu-tier customization. A surprising number of people do, because they asked for "a custom index" and got quoted for the product that phrase triggers rather than the one they needed.