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quarterly holdings since 2019, from its SEC Form N-PORT filings, TickerInside, https://tickerinside.com/api/v1/quarterly/pff.json","answer":"In PFF's SEC filings, its largest position went from JPMorgan Chase & Co preferred stock (JPM.PFD) at 3.45% on 2019-09-30 to Boeing Co preferred stock (BA.PFD) at 3.93% on 2026-06-30, across 28 quarterly reports."}