IBIT vs FBTC: Which Bitcoin ETF Is Better?

IBIT and FBTC are spot bitcoin ETFs: shares you buy in an ordinary brokerage account, each backed by real bitcoin held in storage. IBIT is BlackRock's fund, FBTC is Fidelity's. They charge the same fee - 0.25% a year - and hold the same asset, so the honest answer to which is better is that on paper they are nearly the same product. What differs is size, and who holds the coins.

What is actually different between them?

Size, mostly. IBIT is by far the largest of the US spot bitcoin funds, holding around $69bn in October 2026 - roughly three-fifths of the whole category. FBTC holds about $16bn, which makes it the second largest and still very big. The other real difference is custody: IBIT's bitcoin sits with Coinbase, which guards the coins for most of these funds, while Fidelity stores FBTC's bitcoin itself through its own digital assets arm.

Does the size difference matter to you?

A little, and not in the way people expect. A bigger fund trades more often, which usually means a narrower gap between the buying and selling price - the spread. Think of it as the difference between changing money at a busy airport counter and a quiet one: the rate on the board is the same, the queue and the margin are not. On a long-term holding of a few thousand dollars, that gap is small. For someone trading in and out weekly, or using options, IBIT's deeper market is the practical edge.

So which one is better?

Better at what, is the real question. The fee is identical, so that familiar tiebreaker is gone. IBIT wins on trading volume and options. FBTC appeals to anyone who would rather not have their coins at the same custodian as most of the market. And if you already hold an account at one of the two firms, commission-free trading there may matter more than either difference.

Whichever you pick, check the fund's own page for its current fee and holdings before buying - these funds change terms, and a comparison written months ago goes stale. Next, see every bitcoin ETF compared or add a third option with IBIT, FBTC or ARKB.