Bond-ETF NAV dislocation — literature and mechanism review

By Arhan Canli, Canli Capital

Reviewed: 2026-08-16. Stage: source review only. No market observations, returns, signs, thresholds, horizons, or portfolio statistics were inspected.

Mechanism under review

Corporate-bond ETFs can trade away from their reported net asset value because ETF shares trade continuously while many underlying bonds trade infrequently and are valued using evaluated marks. The creation/redemption mechanism is also not a frictionless full-holdings arbitrage: bond ETF baskets can be fractional, change through time, and differ systematically between creations and redemptions. Liquidity and dealer balance-sheet constraints can therefore permit persistent price/NAV gaps.

That observation does not establish a secondary-market alpha. A discount may mean the ETF is discovering the value of stale underlying marks rather than that the ETF is mispriced. Authorized participants have creation/redemption access and basket information that an ordinary brokerage account does not. ALPHAC must not label a long/short ETF trade as AP arbitrage or assume convergence to an accounting NAV is executable.

Adversarial evidence

Federal Reserve research finds ETF arbitrage efficacy depends on liquidity, with stronger and more persistent effects for less-liquid bond ETFs.
BIS work documents fractional and high-turnover bond baskets and links persistent premiums and discounts partly to slow NAV adjustment to ETF prices.
The March 2020 episode is not clean proof of ETF underpricing: bond ETF prices could incorporate information faster than stale constituent marks.
Public iNAV/indicative values are not necessarily real-time executable portfolio values and may reuse stale evaluated prices.

Source implications

A credible historical test needs synchronized point-in-time records for ETF NBBO/trades, official NAV and publication time, holdings and creation/redemption baskets, bond identifiers and corporate actions, underlying TRACE trades, executable spread/impact estimates, and valuation timestamps. Daily premium/discount data alone cannot identify which side of the gap contains the information.

FINRA offers transaction-level historical TRACE data with execution time, price, size, and yield, but historical products require agreements and fees. Rule 6c-11 requires recent daily ETF website disclosures and a chart for the most recently completed calendar year/current quarters; it does not create a free permanent ten-year archive.

Primary sources

Federal Reserve, Arbitrage and Liquidity: Evidence from a Panel of Exchange Traded Funds: https://www.federalreserve.gov/econres/feds/arbitrage-and-liquidity-evidence-from-panel-of-exchange-traded-funds.htm
BIS, The anatomy of bond ETF arbitrage: https://www.bis.org/publ/qtrpdf/r_qt2103d.htm
BIS, ETFs, illiquid assets, and fire sales: https://www.bis.org/publ/work975.htm
SEC Rule 6c-11 adopting release: https://www.sec.gov/files/rules/final/2019/33-10695.pdf
FINRA TRACE historical-data information: https://www.finra.org/industry/trace-historic-academic-data

Claim boundary

The literature supports a real price-discovery and market-structure question, not a return claim. No evidence here establishes sign, timing, net profitability, diversification, capacity, or sleeve admissibility.