Building a Free Stock Analysis Tool Revealed How Messy SEC Filing Data Really Is

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A developer building Intrinsiqq, a platform providing financial scores and valuations for roughly 7,800 listed companies, chose to source all data directly from free, public SEC filings rather than purchasing it from third-party vendors. The decision kept costs low and ensured figures matched official regulatory disclosures, but exposed a far more complex data quality problem than anticipated. Unlike typical API errors that fail visibly, SEC filing data consistently delivers numbers in the correct format and field that are nonetheless silently wrong, with no alerts or test failures to signal the issue. Structural quirks compound the problem: companies use varying fiscal year-end dates, annual reports embed multiple years of figures under the same label, quarterly data must be mathematically reconstructed since no fourth-quarter filing exists, and different statements within the same filing cover different time spans. The developer published this account to document pitfalls that cost months of work, noting the challenges are rarely discussed openly despite being widespread among anyone building directly on raw filing data.

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