Grounded Event Extraction from SEC 8-K Filings with a Fine-Grained Taxonomy

Two-stage LLM system extracts fine-grained events from 292K SEC 8-K filings with grounded citations

Researchers present a two-stage LLM pipeline that classifies SEC Form 8-K filings against a 119-type event taxonomy, anchoring every label to a verbatim quote via fuzzy n-gram validation and re-scoring each citation for quality. Applied to 292,984 filings from 2022–2026, the system produces 601,088 grounded event tags with precision rising from 12% to 96% as quality scores increase. The authors release the tagged dataset and validate economic signal via an event study on abnormal returns, confirming the taxonomy captures economically distinct events that the SEC's coarse item codes conflate.