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8/1/2026
The user wants me to rewrite a headline for a mobile feed. Let me analyze the original:

The user wants me to rewrite a headline for a mobile feed. Let me analyze the original:

Original: Parsing SEC EDGAR's Form 4 feed: the edge cases nobody warns you about

Short summary

A detailed field guide on building a near-real-time pipeline for SEC EDGAR Form 4 insider trading filings, covering undocumented edge cases like type=4 returning non-Form-4 filings, duplicate entries under different CIKs, holdings-only filings that crash parsers, and HTML-escaping inconsistencies. The author defends a strings-as-filed design philosophy for numeric data to preserve fidelity. Production incidents like 403-vs-throttling ambiguity and amendment handling are also addressed with concrete fixes.

  • •EDGAR's type=4 feed returns non-Form-4 filings; re-filter on parsed form type from entry title
  • •Use accession number as primary key to avoid duplicate storage; validate root XML element not file extension
  • •Deliver numbers as strings to preserve filing fidelity; handle 403 ambiguity with canary requests

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