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quarterly holdings since 2019, from its SEC Form N-PORT filings, TickerInside, https://tickerinside.com/api/v1/quarterly/rsph.json","answer":"In RSPH's SEC filings, its largest position went from Align Technology (ALGN) at 2.26% on 2019-10-31 to Bio-Techne (TECH) at 2.13% on 2026-07-31, across 28 quarterly reports."}