Paper finds active ETF positioning before earnings calls predicts a friendlier call tone

The fifteen trading days before an earnings call used to leave no public trace, since a mutual fund manager could build a position into a print and the next holdings disclosure would land after the tape moved. That left advisors hunting fundamentally driven active equity strategies with little to inspect during the run-up, a gap that closed when active ETFs began publishing their books daily and a new paper treats the resulting record as a measurement window.

"Positioned Before the Call: Active Equity ETF Trading and Earnings Call Voice," co-authored by Ziwei Zhao, an assistant professor of finance at the University of Lausanne, with Alan Huang, Russ Wermers and Jingyu Zhang, reports that active equity ETF positioning anticipates the "vocal affect" — the nontextual tone — realized on the call itself. Net buying, measured by the authors as changes in portfolio weights adjusted for ETF flows across those fifteen days, predicted more favorable vocal affect in analyst questions and in executive answers, according to ETF Trends' account of the research. The relationship held even after controlling for transcript text tone, earnings surprises and stock-specific variables, the authors report.

Daily transparency is no longer a niche feature. The same account points to the $42 billion iShares US Equity Factor Rotation Active ETF (DYNF) and the $39 billion Capital Group Dividend Value ETF (CGDV) as signs of how far active ETFs have come, and as the kind of portfolios that make group-level study possible in the first place.

The more useful part of the paper is where the pre-call signal comes from: source tests described by the authors show ETF managers and sell-side analysts responding to distinct inputs, with hard economic news and peer firms' earnings surprises driving fund positioning while peer analyst tone drives the affect of the questions. On that reading, positioning and vocal tone are two separate reactions to a shared pre-call environment rather than one side reading the other's hand, which makes the fifteen-day window a forecast about how a call will sound.

PWD has argued that the wrapper is now a fee and distribution tool as much as a product identity, and the paper points to a third function mutual funds cannot replicate: the daily book as a dataset, one that researchers can run through fifteen-day windows with flow adjustments. What the account does not report is any return figure attached to the positioning—it tests whether the tone was anticipated, not whether the trade paid.

TMX VettaFi conducted the interview, and its webcast stage has become a recurring venue in this publication's coverage of strategy research, from RAFI's fundamental indexing push to the derivative-heavy launch wave. Earnings season opens in the coming days. PepsiCo leads and the big banks are close behind, which puts the next pre-call window in progress now.