LLM-based Triplet Extraction from Financial Reports

• URL: http://arxiv.org/abs/2602.11886v1
• Date: Thu, 12 Feb 2026 12:36:10 GMT
• Title: LLM-based Triplet Extraction from Financial Reports
• Abstract summary: We present a semi-automated pipeline for Subject-Predicate-Object triplet extraction using Ontology Conformance and Faithfulness metrics.<n>We also propose a hybrid verification strategy that combines matching with an LLM-as-a-judge check, reducing apparent subject hallucination rates from 65.2% to 1.6%.
• Score: 39.146761527401424
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Corporate financial reports are a valuable source of structured knowledge for Knowledge Graph construction, but the lack of annotated ground truth in this domain makes evaluation difficult. We present a semi-automated pipeline for Subject-Predicate-Object triplet extraction that uses ontology-driven proxy metrics, specifically Ontology Conformance and Faithfulness, instead of ground-truth-based evaluation. We compare a static, manually engineered ontology against a fully automated, document-specific ontology induction approach across different LLMs and two corporate annual reports. The automatically induced ontology achieves 100% schema conformance in all configurations, eliminating the ontology drift observed with the manual approach. We also propose a hybrid verification strategy that combines regex matching with an LLM-as-a-judge check, reducing apparent subject hallucination rates from 65.2% to 1.6% by filtering false positives caused by coreference resolution. Finally, we identify a systematic asymmetry between subject and object hallucinations, which we attribute to passive constructions and omitted agents in financial prose.

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