Active ETF Growth: The Structural Reasons ETFs Are Overtaking Mutual Funds

The mutual fund industry spent seventy years training investors to accept an annual tax bill they never asked for. Every December, actively managed funds sold winners to meet redemptions or rebalance, and shareholders who never touched their accounts still opened a 1099 showing capital gains they had to pay tax on. That arrangement is unwinding faster than almost anyone predicted five years ago, and the exchange-traded fund wrapper is the reason why.

Why This Shift Is Happening Now

Active management didn’t suddenly get better inside an ETF wrapper. The stock-picking, the research process, the portfolio manager’s judgment calls — none of that changed. What changed is the plumbing underneath the fund, and plumbing turns out to matter enormously when tax season arrives.

For most of the 2010s, active ETFs were a small, mostly overlooked corner of the fund industry. Regulatory rules made it hard to run a fully active, non-transparent strategy inside an ETF, and fund sponsors were cautious about cannibalizing their existing mutual fund fee revenue. Two things broke that logjam. First, the SEC’s 2019 “ETF Rule” (Rule 6c-11) standardized the exemptive relief that ETFs needed to operate, cutting the cost and time required to launch one. Second, a handful of large asset managers ran the numbers on what capital gains distributions were doing to their mutual fund shareholders’ after-tax returns and concluded the mutual fund wrapper itself was becoming a competitive liability.

Once a few well-known active managers proved that a converted or newly launched active ETF could track the same strategy, charge less, and avoid distributing a painful year-end capital gain, the rest of the industry had to respond. Assets follow the path of least tax friction, and money has been moving down that path for several years running.

The In-Kind Redemption Mechanism: How ETFs Sidestep Capital-Gains Distributions

To understand why active ETFs behave so differently on the tax front, you have to understand how shares actually get created and destroyed.

A traditional mutual fund is a closed loop between the fund and its shareholders. When you want out, you sell your shares back to the fund itself, and the fund often has to raise cash to pay you — sometimes by selling appreciated securities. If the fund has embedded gains sitting in a stock it has held for years, that sale realizes a capital gain at the fund level. Under the rules governing regulated investment companies, that realized gain has to be distributed to shareholders at least once a year, and every shareholder of record on the distribution date owes tax on their slice of it, whether they personally profited from the trade or not, and even if they bought their shares the week before the distribution.

An ETF works through a different circuit entirely. Retail investors buy and sell ETF shares on an exchange, trading with each other, not with the fund. The only party that transacts directly with the fund is a small set of institutional intermediaries called authorized participants (APs). When an AP wants to redeem a large block of ETF shares, the fund typically hands over a basket of the underlying securities rather than cash. Because that exchange is a security-for-security swap rather than a securities-for-cash sale, it generally does not trigger a taxable event for the fund. Fund managers use this mechanism deliberately, delivering their lowest-cost-basis (most appreciated) shares to redeeming APs first, which quietly scrubs embedded gains out of the portfolio over time without ever selling those shares for cash.

The practical result: an ETF running the exact same active strategy as a comparable mutual fund can go years without distributing a capital gain, even in a strong bull market where the mutual fund version is forced to pay out. This is not a loophole exclusive to index ETFs — it works for actively managed strategies too, as long as the portfolio holds securities liquid enough to be delivered in kind, which is true of most large-cap equity and many fixed-income strategies. It becomes harder to exploit for strategies trading in thinly traded or hard-to-transfer instruments, which is part of why not every active strategy has made a clean jump to the ETF wrapper.

Fee Compression: Comparing Expense Ratios Across Wrappers

Capital gains efficiency gets most of the attention, but the fee gap between the two wrappers has been just as important in pulling assets toward ETFs.

Legacy mutual fund share classes carry cost structures built for a distribution model that dominated the 1980s and 1990s: a network of brokers and advisors paid through 12b-1 fees, sub-transfer-agency fees, and revenue-sharing arrangements baked into the expense ratio. A retail “A share” or “investor share” class of an actively managed equity fund commonly runs an expense ratio between 0.55% and 1.10%. ETFs, distributed purely through exchanges with no need for that broker-compensation infrastructure, typically strip those costs out. Actively managed equity ETFs from major sponsors tend to land between 0.35% and 0.65% for a broadly comparable large-cap or sector strategy — often 20 to 40 basis points cheaper than the mutual fund sibling running the identical playbook.

That gap sounds small until you compound it. On a $250,000 account, 30 basis points of annual fee drag is $750 a year that never gets a chance to grow. Over fifteen years at a modest 7% return, that steady drag can cost an investor a meaningfully larger number than the raw fee difference suggests, because the fee is taken every year from a growing balance.

Fee compression alone would probably have produced some rotation toward ETFs over time. Paired with the tax advantage, it has been enough to reverse a decades-long flow pattern in a handful of years.

The Conversion Wave: Why Established Active Managers Are Rebuilding Mutual Funds as ETFs

The clearest signal that the wrapper itself matters, separate from investment skill, is how many firms have converted existing mutual funds directly into ETFs rather than simply launching a new fund alongside the old one.

A straight conversion is more surgical than a fund closure and relaunch. The mutual fund’s shareholders don’t have to sell and rebuy; their existing shares get exchanged for ETF shares of equivalent value in a transaction structured to be tax-free at the point of conversion, and the fund keeps its track record, its portfolio manager, and its historical performance numbers. Dimensional Fund Advisors ran some of the earliest large-scale conversions, moving billions of dollars of formerly mutual-fund-only assets into ETF share classes. JPMorgan, Fidelity, and several mid-size active shops have since followed with their own conversions or by filing for a “dual share class” structure that lets a single portfolio offer both a mutual fund share class and an ETF share class side by side.

That dual-share-class filing, once limited to a patent held by Vanguard, opened up after the patent expired and a wider set of asset managers received exemptive relief to copy the approach. It matters because it lets a fund sponsor keep the mutual fund distribution relationships that advisors and retirement plans still rely on while offering a tax-efficient ETF version of the identical portfolio to everyone else. Expect more sponsors to file for this structure rather than run parallel, differently-managed funds under two wrappers.

None of this activity is a verdict on active management as a discipline. It’s an admission that the mutual fund wrapper had become a drag on the very returns those managers were trying to deliver, and that admission is why so much of the growth in active ETF assets over the past several years has come from money that used to sit in an active mutual fund with the same name on the label.

What You Actually Give Up: Daily Transparency and Strategy Constraints

The move toward active ETFs is not free of tradeoffs, and it would be misleading to describe it as a strict upgrade for every strategy.

Most active ETFs are fully transparent, disclosing their complete holdings every business day. Mutual funds disclose full holdings quarterly, usually with a lag of 30 to 60 days before the report becomes public. For an index fund, daily transparency costs nothing because there’s no proprietary insight to protect. For an active manager slowly building a position in a less liquid stock, or running a concentrated portfolio where a handful of large bets drive most of the return, daily disclosure gives other market participants a live map of what the manager is doing. Sophisticated traders can, in principle, front-run known ETF rebalancing flows or infer a manager’s next move from small daily changes in the published basket.

A handful of “semi-transparent” or “active non-transparent” ETF structures were built specifically to solve this problem, using a proxy basket that approximates the real portfolio without revealing it exactly. Adoption of these structures has been modest; many managers concluded the transparency cost was smaller than feared, especially for strategies trading in liquid large-cap names where a published position doesn’t meaningfully move markets. But for small-cap stock pickers, merger-arbitrage strategies, or managers who value discretion around building a stake before it’s fully known, daily transparency remains a real reason to stay in the mutual fund wrapper, or to use a semi-transparent structure at a fee premium.

There’s a second, quieter tradeoff. ETF shares trade on an exchange at a market price that can drift slightly from the fund’s net asset value, particularly for less liquid underlying holdings or during volatile trading sessions. Market makers generally keep that gap narrow, but it’s a friction mutual fund investors, who always transact at end-of-day NAV, simply don’t experience. And some retirement plan platforms and 401(k) recordkeeping systems still aren’t built to hold ETFs at all, which is one reason the mutual fund share class isn’t disappearing even where a dual structure exists.

A Worked Example: Comparing Capital Gains Distributions Side by Side

Numbers make the mechanism easier to feel. Assume a hypothetical actively managed large-cap growth strategy is offered in two share classes run by the same portfolio management team against the identical basket of stocks — a mutual fund class and an ETF class, a structure several fund families now genuinely offer.

In a given calendar year, the strategy returns 11% gross of fees. The underlying portfolio has substantial embedded gains built up over a multi-year rally, and normal turnover forces some of those winners to be sold for portfolio management reasons unrelated to redemptions.

The mutual fund shareholder owes $690 in taxes for a position they never sold, money that either comes out of pocket or forces a partial redemption to cover the bill. The ETF shareholder, holding the identical underlying portfolio through the identical strategy, owes nothing that year. Their embedded gain isn’t erased — it will eventually be taxed when they sell their ETF shares — but it stays deferred and keeps compounding in the meantime, rather than being forced out of the account on a schedule the fund company controls rather than the investor.

Stretch that single-year difference across a decade and the gap compounds. If the mutual fund investor’s after-tax growth rate runs roughly 0.8 percentage points below the ETF investor’s each year, purely from the combination of the fee gap and the annual distribution drag, a $100,000 starting balance grows to roughly $210,000 in the mutual fund class after ten years at a hypothetical 7.7% after-tax rate, versus roughly $228,000 in the ETF class at 8.6%. That’s an $18,000 difference from wrapper mechanics alone, before considering which manager actually picked better stocks.

Active ETF vs. Active Mutual Fund: A Side-by-Side Comparison

Common Mistakes Investors Make When Weighing Active ETFs Against Mutual Funds

Assuming “ETF” automatically means “cheaper and more tax-efficient”

The wrapper tends to help, but a poorly run active ETF trading illiquid small-cap names or leaning on frequent full-portfolio turnover can still distribute meaningful gains in a rough year, and a handful have. Check the fund’s actual distribution history rather than assuming the structure alone guarantees an outcome.

Selling the mutual fund class to buy the ETF class inside a taxable account without checking your own cost basis

If your existing mutual fund shares have large unrealized gains, selling them to switch wrappers triggers exactly the tax event you were trying to avoid. Where a fund sponsor offers a genuine conversion or a tax-free exchange path between share classes of the same fund, that route avoids the problem; a plain sell-and-rebuy does not.

Ignoring bid-ask spreads on thinly traded active ETFs

A newer or smaller active ETF may have wide spreads and shallow trading volume, meaning the price you actually pay or receive can drift from the fund’s real net asset value. This friction is usually small for large, well-established funds and larger for niche or newly launched ones.

Forgetting that embedded gains inside the ETF still get taxed eventually

In-kind redemption defers capital gains for the fund and its remaining shareholders; it doesn’t make them disappear. When you personally sell your ETF shares at a profit, you’ll owe capital gains tax like anyone else. The wrapper advantage is about avoiding forced, undiversifiable distributions along the way, not about tax avoidance at the finish line.

Assuming every mutual fund has an ETF twin available

Plenty of well-regarded active strategies, particularly in small-cap, emerging-market, or specialty fixed-income categories, still exist only as mutual funds. Don’t force a switch where no comparable ETF vehicle exists just because the trend is moving that direction industry-wide.

A Practical Checklist Before You Swap a Mutual Fund for Its ETF Version

Key Takeaways

Frequently Asked Questions

What is in-kind redemption and why does it matter for taxes?

In-kind redemption is the process by which an ETF hands over a basket of its underlying securities to an authorized participant instead of selling those securities for cash to fund a redemption. Because it’s a security-for-security exchange rather than a sale, it generally doesn’t trigger a taxable capital gain at the fund level, which is why ETFs distribute far fewer capital gains than mutual funds that must sell holdings for cash to meet redemptions.

Are actively managed ETFs really outperforming actively managed mutual funds?

Not necessarily on a pre-tax, pre-fee basis when the same manager runs both wrappers against the same portfolio — the underlying investment decisions are usually identical. The performance gap that shows up favors ETFs mainly on an after-tax and after-fee basis, driven by lower expense ratios and fewer forced capital gains distributions rather than by better stock selection.

Why are so many mutual funds converting into ETFs instead of just launching new ETFs?

A direct conversion lets the fund keep its existing track record, portfolio manager, and shareholder base while moving into a more tax-efficient structure, all without forcing existing shareholders to sell and trigger a taxable event. Launching an entirely new ETF alongside the old mutual fund would mean starting from zero assets and a fresh performance history.

Do active ETFs disclose their holdings less often than mutual funds?

It’s the opposite for most active ETFs: they disclose full holdings every trading day, while mutual funds disclose quarterly with a 30- to 60-day lag. A smaller group of “semi-transparent” active ETFs use a proxy basket to limit exactly how much of the live portfolio gets revealed, but full daily transparency is the more common structure.

Is an active ETF always cheaper than the mutual fund version of the same strategy?

Usually, but not always. Expense ratios depend on the specific share class and fund sponsor, and some mutual fund share classes, particularly institutional or no-load classes without embedded distribution fees, can charge close to what an ETF version costs. It’s worth comparing the actual current expense ratio of both options rather than assuming the ETF wins by default.

For investors who want to go a layer deeper on how wrapper mechanics affect after-tax outcomes, the comparison holds up well against how direct indexing stacks up against ETFs for tax-loss harvesting, since both articles trace back to the same in-kind creation and redemption process that underpins ETF tax efficiency generally.

References

1. U.S. Securities and Exchange Commission — Final Rule: Exchange-Traded Funds (Rule 6c-11)
2. Investment Company Institute — Annual Fund Flows and ETF Industry Research
3. Internal Revenue Service — Publication 550: Investment Income and Expenses
4. Morningstar — ETF Research and Fund Flow Analysis
5. Dimensional Fund Advisors — Insights on Mutual-Fund-to-ETF Conversions
6. Vanguard — ETF Structure and Tax Efficiency Education