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Equity Compensation
Section 351 Exchanges: Moving Appreciated Stock into an ETF
How Section 351 ETF conversions let investors exchange a diversified basket of appreciated securities, including a concentrated position, for ETF shares without triggering immediate capital gains.
Section 351 Exchanges: Moving Appreciated Stock into an ETF
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What Is a Section 351 Exchange
- Section 351 of the Internal Revenue Code allows property to be transferred to a corporation in exchange for its stock without triggering immediate tax, subject to strict conditions
- Applied to investing, it lets investors contribute portfolios of appreciated securities to a newly launching ETF in exchange for shares of that ETF
- Often called a 351 conversion or ETF seeding, the technique gained traction as new ETF sponsors began launching funds specifically to accept outside portfolios
- The result is swapping a basket of individual positions for a single diversified ETF holding, with the tax bill deferred rather than paid at the exchange
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What Is a Section 351 Exchange
- Section 351 of the Internal Revenue Code allows property to be transferred to a corporation in exchange for its stock without triggering immediate tax, subject to strict conditions
- Applied to investing, it lets investors contribute portfolios of appreciated securities to a newly launching ETF in exchange for shares of that ETF
- Often called a 351 conversion or ETF seeding, the technique gained traction as new ETF sponsors began launching funds specifically to accept outside portfolios
- The result is swapping a basket of individual positions for a single diversified ETF holding, with the tax bill deferred rather than paid at the exchange
How the Tax Deferral Works
- No capital gain is recognized when eligible securities are contributed; the unrealized gain carries into the ETF shares received
- Cost basis and holding period transfer over, so selling the ETF shares later triggers the deferred gain at that time
- Deferral is not elimination: taxes are postponed, not forgiven, though under current law heirs may receive a step-up in basis at death
- Once operating, an ETF can use in-kind creation and redemption mechanics to manage its internal holdings tax-efficiently, which is part of the structure's appeal
The Diversification Test
- Tax rules for transfers to investment companies require each contributed portfolio to be diversified, commonly summarized as the 25/50 test
- No single issuer may exceed 25% of the value of the portfolio being contributed
- The five largest issuers combined may not exceed 50% of the contributed portfolio's value
- A single stock cannot be exchanged on its own; the contribution must be a basket that passes the test on the day of the exchange
Using a 351 Exchange for a Concentrated Position
- A concentrated holding can make up to roughly a quarter of the contributed basket, with other securities, often other appreciated positions, filling the remainder
- This can convert a portfolio dominated by one name into a diversified ETF position without an immediate tax bill on the appreciation
- Investors with several low-basis positions, such as long-tenured employees with company stock plus legacy holdings, may find the basket requirement easier to satisfy
- Larger concentrations may take multiple steps or complementary techniques over several years, since the 25% issuer cap applies to each exchange
How 351 Conversions Compare to Exchange Funds
- Traditional exchange funds are partnerships that accept a single concentrated stock but typically require a seven-year holding period before diversified shares are delivered
- A 351 conversion delivers ETF shares that trade daily, with no required lockup, though selling them realizes the deferred gain
- ETFs generally offer daily transparency and often lower ongoing fees than partnership exchange funds
- The tradeoff runs the other way on eligibility: exchange funds take one stock but restrict access and liquidity, while 351 exchanges demand a diversified basket up front
Risks and Practical Considerations
- The structure is newer and less time-tested than partnership exchange funds; execution details matter and sponsors rely on tax opinions rather than a specific IRS blessing of every variation
- After the exchange, returns follow the ETF's strategy, which may differ meaningfully from the securities contributed
- The transaction is effectively one-way: exiting the ETF means selling shares and recognizing the deferred gain
- Sponsor minimums, transferability of the contributed securities, state taxes, and interactions with other techniques all require case-by-case review with a qualified tax professional
Key Takeaways
- Section 351 exchanges allow appreciated securities to move into a newly launched ETF without triggering immediate capital gains
- The 25/50 diversification test means a concentrated stock can anchor, but not constitute, the contributed portfolio
- Compared with traditional exchange funds, 351 conversions trade a lockup requirement for a diversified-basket requirement
- Tax deferral, carryover basis, and potential step-up at death make the technique worth evaluating alongside other concentrated-stock strategies with professional tax guidance
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