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quarterly holdings since 2020, from its SEC Form N-PORT filings, TickerInside, https://tickerinside.com/api/v1/quarterly/arkk.json","answer":"ARKK's largest position in its SEC filings has been Tesla, Inc. (TSLA) since 2020-04-30: 11.69% then and 9.74% in its report for 2026-07-31, across 26 quarterly reports."}