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quarterly holdings since 2019, from its SEC Form N-PORT filings, TickerInside, https://tickerinside.com/api/v1/quarterly/usrt.json","answer":"In USRT's SEC filings, its largest position went from Prologis (PLD) at 5.43% on 2019-10-31 to Welltower (WELL) at 9.03% on 2026-07-31, across 27 quarterly reports."}