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quarterly holdings since 2019, from its SEC Form N-PORT filings, TickerInside, https://tickerinside.com/api/v1/quarterly/pho.json","answer":"In PHO's SEC filings, its largest position went from Waters Corporation (WAT) at 7.84% on 2019-10-31 to Roper Technologies (ROP) at 9.12% on 2026-07-31, across 26 quarterly reports."}