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Historical data on ETF holdings?

There are many instances where it may be desirable to know what an ETF's holdings are. For example, you might want to:

  • maintain a long/short position in the ETF with the exception/inclusion of a few securities
  • approximately replicate a desired portfolio via linear combinations of different ETFs
  • avoid possible lack of liquidity, tracking issues, and inefficient habits of an otherwise good ETF

Is there a way for our algorithm to fetch the data before the trading day begins?