The Hidden Mechanics of ETFs: APs, Creation Units, and Pricing (EP.246)

Mar 4, 2026

A plain-English tour of the hidden plumbing behind ETFs. You hear how creation and redemption keep supply and demand balanced. The role of authorized participants and why NAV can diverge from market price are unpacked. Practical trading, spread, and tax implications for everyday investors are highlighted.

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INSIGHT

ETFs Run On Two Linked Markets

ETFs operate in two markets simultaneously: the visible secondary exchange and the unseen primary market with authorized participants.
The primary market is where APs create/redeem shares directly with the fund, which is what truly differentiates ETFs from mutual funds.

INSIGHT

APs Keep ETF Prices Anchored To NAV

Authorized participants (APs) can swap a basket of securities for large blocks of ETF shares or vice versa, and they act when price and NAV diverge.
APs profit from arbitrage, so their activity tends to keep market price close to NAV by creating new ETF shares when demand pushes price above NAV.

INSIGHT

Premiums And Discounts Create Arbitrage

NAV is the fund's underlying holdings divided by shares outstanding, while the market price is the live exchange price that can trade at a premium or discount.
Significant premiums or discounts create arbitrage opportunities that APs exploit to restore alignment between NAV and market price.

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ETFs look simple on the surface—you buy a ticker and move on. But behind every ETF is a set of mechanics that explains how shares get created, why prices usually stay close to what the fund owns, and when trading costs and tax outcomes can surprise you. In Part 2 of this three-episode series, I break down the ETF "plumbing" in plain English so you can use ETFs more confidently and avoid common mistakes.

Listen now and learn:

► What authorized participants actually do—and why they matter to everyday ETF investors

► How the creation/redemption process works behind the scenes when supply and demand shift

► Why NAV and market price can diverge, and what typically pulls them back together

► The practical implications for you: spreads, execution, and when ETFs can behave differently than mutual funds

Visit www.TheLongTermInvestor.com for show notes, free resources, and a place to submit questions.

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Editing and post-production work for this episode was provided by The Podcast Consultant (⁠https://thepodcastconsultant.com ⁠)