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quarterly holdings since 2019, from its SEC Form N-PORT filings, TickerInside, https://tickerinside.com/api/v1/quarterly/xlsr.json","answer":"XLSR's largest position in its SEC filings has been State Street Technology Select (XLK) since 2019-09-30: 34.94% then and 27.81% in its report for 2026-06-30, across 28 quarterly reports."}