The Fastest Growing ETFs 2026 Has Produced So Far

"Fastest growing" means two different things

When a fund company calls an ETF fast growing, it usually means assets under management. When a ranking site says it, it usually means trailing returns. The two measures can point in opposite directions, and mixing them up is the most common mistake in this corner of the internet.

Here is a purely illustrative example. Imagine a fund that starts the year with $10 billion in assets. Its price goes nowhere, but investors pour in another $10 billion of fresh cash. By the asset measure, the fund grew 100% while paying its holders nothing. Now flip it: a tiny fund posts a huge return, attracts no inflows, and stays tiny. One ranking crowns the first fund. The other crowns the second.

This post follows the asset measure, because it is the one you can verify. Return rankings change with every market swing. Flow numbers come with as-of dates and get filed with the SEC.

Where the money went in the first half of 2026

Start with the largest numbers on the board. BlackRock's Q2 2026 earnings release, filed with the SEC as an 8-K exhibit, reported record first-half net inflows of $321 billion, including $192 billion in the second quarter. The release describes those flows as "broad-based across the platform and driven by ETFs, private markets, active fixed income."

Two more figures from the same filing round out the picture. Total BlackRock assets hit a record $15.3 trillion, with first-half flows more than doubling year over year. And iShares, the ETF arm, crossed $6 trillion on its own, roughly doubling in three years per the filing.

Doubling a multi-trillion-dollar asset base in three years is the kind of growth rate people usually associate with startups. Here it happened inside the most boring product category in finance, and the filing is public if you want to check the math yourself.

State Street: growth in the boring aisle

The second data point comes from State Street. In June 2026 the firm announced a new Nasdaq-100 ETF as an addition to its low-cost SPDR Portfolio suite. The press release put the suite at approximately $433 billion in assets as of June 15, 2026.

The same release disclosed total SPDR ETF assets of $1,940.32 billion as of March 31, 2026, of which about $184.18 billion sits in gold funds. Call it roughly $1.94 trillion, with gold making up a bit under a tenth of the total.

The detail worth chewing on is which shelf State Street chose to extend. It did not launch anything exotic. It added a plain Nasdaq-100 fund to its cheapest lineup, the one that already held $433 billion. Issuers expand the shelves that are already selling, and in 2026 the low-cost core shelf is the one getting the extension.

The rate backdrop behind the flows

One piece of context for all of this: the effective federal funds rate averaged 3.63% in June 2026, per the St. Louis Fed's FRED data. Cash still pays something. That makes the size of these ETF inflows more notable, since money market yields near that level compete for the same dollars.

Nobody can prove causation from a rate print and a flow number. But when you read a "fastest growing" list, the as-of date matters, and the rate environment behind that date matters too. A flow record set with cash yielding 3.63% reads differently than one set with cash yielding close to zero.

How to read a fast-growth ETF list without getting fooled

A short checklist, learned from reading too many of these rankings:

• Find the measure. Trailing returns or asset growth? A 5-year-return table and a flows table can rank the same funds in nearly opposite order.
• Check the as-of date. The State Street figures above carry two different dates, March 31 and June 15 of 2026, in a single press release. Lists that omit dates are guessing.
• Trace the numbers. Issuer press releases and SEC filings beat scraped databases. Every figure in this post links back to one of those two.
• Ask what other people's inflows buy you. Mostly they benefit the fund company's fee line. Fund size on its own says nothing about future returns.

Investors considering a fast-growing fund often start with what it holds rather than how fast it grew. You can pull up any ticker on a MarketPlays symbol page to see data, news, and community research, or scan what is moving on the Explore page before going deeper on any single fund.

Key takeaways

• "Fastest growing" can mean asset growth or price returns. The two rankings rarely agree, so check which one a list uses.
• iShares crossed $6 trillion in ETF assets, roughly doubling in three years (BlackRock Q2 2026 earnings release).
• BlackRock recorded $321 billion of net inflows in the first half of 2026, including $192 billion in Q2 alone (same filing).
• State Street's low-cost SPDR Portfolio suite held about $433 billion as of June 15, 2026, and the firm added a new Nasdaq-100 fund to it.
• The backdrop: the fed funds rate averaged 3.63% in June 2026 (FRED), so cash was a real competitor for those dollars.

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