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quarterly holdings since 2019, from its SEC Form N-PORT filings, TickerInside, https://tickerinside.com/api/v1/quarterly/oih.json","answer":"OIH's largest position in its SEC filings has been Schlumberger (SLB) since 2019-09-30: 20.39% then and 19.00% in its report for 2026-06-30, across 28 quarterly reports."}