Northern Trust Proposes ETF Share Classes

NTRS Northern Trust has filed a proposal with the SEC to introduce ETF share classes within its existing Series Trusts. The move follows a structural precedent set by Vanguard, whose patent on the ETF share class concept expired in 2023. Since expiration, several asset managers including Dimensional Fund Advisors and Fidelity have received SEC approval to add ETF share classes to mutual funds — allowing fund holders to access the same underlying portfolio through a lower-cost, exchange-traded wrapper.

The ETF share class structure offers two key advantages: it enables tax efficiency through in-kind redemptions (ETF share class can purge low-basis securities without triggering taxable events for the mutual fund), and it allows institutional managers to offer ETF access to retail investors without launching a separate fund with separate operational overhead. For Northern Trust, which manages the FlexShares ETF lineup with over $20 billion in AUM, attaching ETF share classes to its mutual fund Series Trusts would simplify distribution across both registered investment advisors (who favor ETFs) and traditional institutional channels (who use mutual funds).

The SEC has been granting these approvals selectively — typically requiring enhanced disclosure around the structural implications for existing shareholders and portfolio management processes. Northern Trust's filing signals confidence that the regulatory path is clear, and positions the firm ahead of what analysts expect will be a broader industry migration toward the hybrid structure. Asset managers with large mutual fund AUMs that have not yet filed — including T. Rowe Price and Capital Group — may face competitive pressure to follow.