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quarterly holdings since 2019, from its SEC Form N-PORT filings, TickerInside, https://tickerinside.com/api/v1/quarterly/iyt.json","answer":"In IYT's SEC filings, its largest position went from Norfolk Southern (NSC) at 10.54% on 2019-10-31 to Union Pacific Corporation (UNP) at 17.38% on 2026-07-31, across 27 quarterly reports."}