How to buy

How to choose a Bitcoin ETF

Twelve funds hold the same bitcoin. Five filters, applied in order, narrow that to a shortlist of two in about ten minutes — and rule out the two genuinely expensive mistakes.

Here is the uncomfortable truth about fund selection in this category: it barely matters. Twelve US funds hold bitcoin. They hold the same bitcoin, priced off similar reference rates, in most cases at the same custodian. There is no manager to evaluate and no strategy to compare.

What does matter is avoiding two specific expensive mistakes, and then picking on cost or liquidity depending on how you plan to trade. This framework gets you there in about ten minutes, and then you can stop thinking about it.

Five filters, in this order

1. Is it actually a spot fund?

   This is the filter that saves the most money and gets skipped the most. BITO is not a spot fund — it holds CME futures and carries an estimated 2.9% annual drag from fee plus roll cost, against 0.14% to 0.25% for spot products. Anything named "Strategy", "Short", "Ultra" or carrying a multiple is a different instrument. Check the fund name against our list of the twelve spot funds, and read spot vs futures if you want the arithmetic.

2. Is it big enough to be safe to hold?

   Below roughly $50 million in net assets, three problems arrive together: spreads widen because market makers cannot justify tight quotes, premiums and discounts persist because arbitrage on small baskets is not worth an authorised participant's attention, and closure becomes a real possibility. A liquidating trust sells its holdings and distributes cash, forcing a taxable event in a year you did not choose.

3. What is the total cost, given how you actually trade?

   Sponsor fee plus the spread you cross, weighted by frequency. Buy once and hold ten years: fee dominates and the cheapest fund wins. Trade monthly: you cross the spread 24 times a year, and a 0.03 percentage-point spread disadvantage costs 0.72% annually — swamping an 0.11 percentage-point fee saving. Details in fees and expense ratios.

4. Who holds the bitcoin?

   Nine of the twelve funds involve Coinbase Custody. Fidelity self-custodies FBTC through its own regulated trust company. BlackRock added Anchorage Digital alongside Coinbase for IBIT, and CoinShares splits between Coinbase and BitGo. If custodian concentration concerns you, those diversified arrangements are the practical response — see custody.

5. Can you buy it where you need to?

   Confirm your broker carries the fund in the account type you want, particularly an IRA. A slightly more expensive fund in a Roth beats a cheaper one in a taxable account by a margin no fee comparison approaches.

If you buy and hold

Weight the sponsor fee heavily and almost ignore the spread — you cross it twice in a decade.

If you trade in and out

The calculation inverts. IBIT's 30-day median bid-ask spread has run around 0.02% — the tightest in the category — against roughly 0.05% for ARKB and wider still on the small funds. Cross that gap twenty-four times a year and it dominates any fee difference available.

IBIT is also the only spot Bitcoin fund with a genuinely deep listed options market, which matters if you write covered calls, buy protective puts, or want to express a bearish view without shorting shares (see shorting). Paying 0.25% for that liquidity is a defensible trade for an active account.

If it is a retirement account

Two things change. Tax drag disappears, so the small reportable events created when the trust sells bitcoin to pay its fee stop mattering. And switching funds later becomes free — no capital gain, so you can move to a cheaper fund whenever one appears.

That second point is underrated. In a taxable account, fund choice is semi-permanent because switching costs tax. In an IRA it is fully reversible, which means you can simply take whatever is cheapest today and revisit it when the fee war moves again. Full detail in Bitcoin ETF in a Roth IRA or 401(k).

Should you switch out of a fund you already hold?

This comes up most often from GBTC holders, and the answer depends entirely on account type.

In a retirement account: switch, without much deliberation. GBTC charges 1.50% against 0.15% for Grayscale's own Mini Trust holding the same bitcoin at the same custodian. There is no tax cost to moving and the saving is permanent.

In a taxable account: do the arithmetic. Selling realises your gain. If you bought GBTC years ago at a fraction of today's price, the tax bill can be large enough that staying in a 1.50% fund is the better financial decision — which is precisely why GBTC retains so many assets despite its fee. Run the numbers on your actual basis and holding period, and consider talking to a tax professional. Both funds are compared in the GBTC profile.

The ten-minute checklist

• Confirm the fund name says it holds bitcoin, not futures or a multiple.
• Check net assets are comfortably above $50 million.
• Read the sponsor fee from the issuer page, and check whether it is a waiver with an expiry.
• Note the typical bid-ask spread and weigh it against your trading frequency.
• Identify the custodian and whether it is diversified or affiliated.
• Verify your broker carries it in the account type you want.
• Check the published premium and discount history looks like a tight band around zero.
• Write down your position size before you open the order ticket.