ETF Heartbeat Trades: How the Creation/Redemption Mechanism Can Reduce Capital-Gains Distributions

Direct Answer

Direct answer: An ETF heartbeat trade is a large creation of ETF shares followed a short time later by a roughly offsetting in-kind redemption. The pattern can allow an ETF to place appreciated securities into the redemption basket instead of selling those securities inside the fund. That can reduce the capital gains the ETF would otherwise distribute to remaining shareholders. The mechanism depends on the ETF creation/redemption system, authorized participants, basket construction, portfolio events such as index rebalances, and U.S. tax rules. It does not make an investor's eventual sale of ETF shares tax-free.

Why This Concept Deserves More Than a Glossary Definition

"Heartbeat trade" sounds like trading-floor slang. Without context it can be mistaken for a rapid trading strategy, a market-timing signal, or a form of wash trading. None of those descriptions captures the mechanism.

Heartbeat trades sit inside the operational structure of an exchange-traded fund. To understand them, a reader needs to understand:

• ETF shares trade on an exchange, but large institutions can also create and redeem shares directly with the fund in large blocks;
• creations and redemptions can occur in kind, using baskets of securities rather than only cash;
• an ETF may need to remove appreciated securities because an index changed, the portfolio was rebalanced, or the manager altered holdings;
• selling appreciated securities inside a fund can create realized gains that may eventually be distributed;
• an in-kind redemption can transfer securities out of the fund rather than force an internal sale; and
• custom baskets can give qualifying ETFs flexibility in what securities are delivered in a creation or redemption basket, subject to Rule 6c-11 policies and procedures.

A heartbeat trade is therefore best understood as a portfolio implementation mechanism, not as a standalone investment strategy for the ETF shareholder.

Ordinary ETF Creations and Redemptions

Most investors buy and sell ETF shares on an exchange. If you buy 50 shares of an ETF through a brokerage, you normally trade with another market participant. The ETF itself does not need to issue 50 new shares because you clicked Buy.

At a larger scale, however, specialized institutions called authorized participants can transact directly with the ETF in creation units.

Creation

In a simplified in-kind creation: an authorized participant assembles the basket specified by the ETF, delivers the basket to the fund, the fund issues a creation unit of ETF shares, and the authorized participant can hold, distribute, or sell those ETF shares.

Redemption

In a simplified in-kind redemption: the authorized participant delivers a creation-unit quantity of ETF shares to the fund, the fund cancels those ETF shares, and the fund transfers a basket of portfolio securities or other permitted assets to the authorized participant.

That in-kind pathway is one reason ETFs can have different tax characteristics from conventional mutual funds.

Where Capital Gains Enter the Picture

Suppose an ETF owns Stock A with a very low tax basis because the position appreciated substantially. Now suppose Stock A must leave the portfolio. Maybe the index removed it. Maybe a merger changes eligibility. Maybe the fund rebalances.

If the ETF simply sells Stock A for cash, the sale can realize a capital gain inside the fund. Depending on the fund's overall tax position and applicable law, realized gains can contribute to capital-gains distributions to shareholders.

An in-kind redemption can create a different path. Instead of selling Stock A, the ETF may be able to deliver Stock A out as part of a redemption basket. The fund no longer owns those shares, but it did not dispose of them through the same kind of taxable sale-for-cash mechanism. That is the economic background behind heartbeat transactions.

Why the Pattern Looks Like a Heartbeat

Academic researchers Ke Shen and Raisa Velthuis describe heartbeat trades as a synthetic creation/redemption process. A large inflow into an ETF is followed within a few days by an outflow of similar magnitude. On a chart of ETF shares outstanding or estimated fund flows, the pattern can resemble a heartbeat spike:

1. Large creation: ETF shares outstanding jump.
2. Short interval: the additional shares remain outstanding briefly.
3. Large redemption: shares outstanding fall by a similar amount.

The important part is not the chart shape. The important part is what the redemption basket can accomplish. If the ETF needs to remove appreciated holdings, a sufficiently large in-kind redemption can carry those holdings out of the portfolio.

A Simplified Worked Example

Example scenario, for education only.

Assume an index ETF holds $8.0 billion of normal portfolio positions plus $200 million of Stock X with a tax basis of $70 million (unrealized gain: $130 million). The index announces that Stock X will be removed at the next rebalance.

Path A: sell Stock X

The ETF sells $200 million of Stock X for cash. Ignoring other tax items, the fund has realized a $130 million gain.

Path B: ordinary redemption demand is already sufficient

If ordinary authorized-participant redemptions happen to be large enough, the ETF may be able to include low-basis Stock X shares in its redemption baskets. The position leaves the fund without requiring the same internal cash sale. No synthetic heartbeat is needed.

Path C: heartbeat structure

If ordinary outflows are insufficient, a large creation can increase shares outstanding. A short time later, an authorized participant redeems a similar number of ETF shares. The ETF's redemption basket can include Stock X, subject to its policies, legal requirements, and basket practices. The appreciated security leaves through an in-kind redemption.

The Role of Custom Baskets

Rule 6c-11, adopted by the SEC in 2019, created a more standardized regulatory framework for many ETFs and permits qualifying ETFs to use custom baskets if they adopt written policies and procedures meeting the rule's requirements.

A custom basket is not simply "whatever the manager wants." Rule 6c-11 defines and governs baskets that can differ from a representative or pro-rata slice of the portfolio, and requires policies, procedures, review responsibilities, and records.

If an ETF needs to remove particular appreciated securities, a basket that can include a non-pro-rata selection can be operationally more targeted than one that must mirror the entire portfolio. The SEC's rule is not a "heartbeat trade rule." It is the basket framework that can make flexible in-kind portfolio management easier for ETFs operating under Rule 6c-11.

What the Academic Evidence Found

The 2025 Review of Financial Studies paper "Role of Taxes in the Rise of ETFs" examines the tax-deferral role of ETF in-kind redemptions and heartbeat trades. Researchers identify heartbeat patterns using daily shares-outstanding data and study how those flows relate to capital-gains distributions and tax burden.

Several findings are useful for investor education:

• heartbeat use increased over the study period;
• heartbeat activity was associated with lower capital-gains distributions and tax burdens in the researchers' sample;
• heartbeat transactions were more likely when ordinary investor outflows were not sufficient to remove unrealized gains that would otherwise need to be realized;
• the pattern was often associated with portfolio rebalancing or index changes; and
• ordinary in-kind redemptions also contributed substantially to ETF tax efficiency.

The correct takeaway is not "heartbeat ETFs are always better." The research provides evidence about a mechanism. An investor still needs to evaluate the ETF itself: exposure, tracking, fees, spread, liquidity, portfolio construction, securities lending, distributions, and tax circumstances.

Heartbeat Trades vs. Ordinary Redemptions

A heartbeat trade is best understood as a special case of creation/redemption activity, not a separate asset class.

What Heartbeat Trades Can and Cannot Do for Shareholders

Potential benefit: lower fund-level capital-gains distributions

If appreciated positions leave in kind rather than through taxable sales inside the fund, remaining shareholders may receive fewer or smaller capital-gains distributions. This can matter in a taxable brokerage account because a fund distribution can create a tax obligation even if the shareholder did not sell the ETF.

Potential benefit: more investor control over realization timing

When the ETF does not distribute gains, more of the tax realization can remain tied to the individual investor's eventual decision to sell ETF shares. That can improve tax deferral.

What it cannot do: erase the investor's gain

If an investor buys an ETF for $50 and later sells it for $80 in a taxable account, the investor generally has a gain on that ETF position regardless of whether the fund used heartbeat trades.

What it cannot do: guarantee zero distributions

ETFs can still distribute capital gains or other taxable income. Fund structure, holdings, corporate actions, derivatives, cash redemptions, portfolio changes, and other factors can affect outcomes.

How to Evaluate an ETF's Actual Tax Behavior

Rather than trying to detect heartbeat trades from charts, most investors can use simpler evidence:

• Capital-gains distribution history: Has the fund distributed capital gains? How often? How large relative to NAV?
• Turnover: Higher turnover can increase tax realization pressure, although ETF mechanics can change the relationship between turnover and distributions.
• Portfolio events: Does the strategy face frequent rebalances, index changes, corporate actions, or derivative resets?
• Structure: Does the fund commonly transact in kind? Does it hold instruments that are difficult to transfer in kind?
• Premium/discount and spread: Tax efficiency is not useful if an investor ignores trading costs and buys a poor-fit ETF.
• After-tax return: Where available and methodologically comparable, after-tax performance can provide a broader outcome measure than distribution history alone.

Common Misconceptions

"A heartbeat trade is illegal tax evasion."

That is not a sound general description. Heartbeat trades are documented ETF creation/redemption practices operating within a regulatory and tax framework. Specific transactions must comply with applicable law.

"A heartbeat trade is a wash trade."

Not simply. The ETF creation/redemption pattern involves fund shares and redemption baskets and should not be collapsed into an unrelated market-abuse label without legal analysis.

"Only actively managed ETFs use them."

No. Index rebalances and deletions can be important triggers.

"The fund avoids all taxes."

No. The mechanism can reduce fund-level realized-gain distributions under certain circumstances; it does not eliminate every tax at the fund or shareholder level.

"I should buy an ETF because it has heartbeat trades."

Heartbeat activity is not a standalone suitability criterion. Exposure, cost, liquidity, risk, tracking, and portfolio fit remain primary.

Frequently Asked Questions

References

• Ke Shen and Raisa Velthuis: Role of Taxes in the Rise of ETFs, Review of Financial Studies (2025)
• SEC: Adopts New Rule to Modernize Regulation of Exchange-Traded Funds (2019)
• SEC: Exchange-Traded Funds Small Entity Compliance Guide
• SEC: Exchange-Traded Funds, Rule 6c-11 Final Rule
• U.S. House Office of the Law Revision Counsel: 26 U.S.C. § 852