Managing Concentrated Public Stock Positions by Seeding an Exchange-Traded Fund

Wealth managers increasingly seed new exchange-traded funds (ETFs) under Internal Revenue Code Section 351,<xref>¹</xref> allowing clients to reallocate low-basis stock into a diversified, professionally managed fund without immediate gain recognition. The primary challenge for practitioners is distinguishing between routine transactions and those that invite IRS scrutiny. Most Section 351 seeds are straightforward applications of a century-old nonrecognition rule. Still, two fact patterns raise harder questions: “Stuffing,” in which investors use borrowed money to pad a portfolio before seeding, and “Sequential Seeding,” in which investors spread the transaction across multiple funds over time. For each, we identify the circumstances that could trigger Section 351(e), which requires recognition of gain on transfers of stock and securities, and support substance-over-form challenges even when the transaction satisfies the literal requirements for nonrecognition under Section 351(a). We conclude with a practical diligence guide summarizing the conditions that most often drive scrutiny risk.