---
schema_version: "secwatch.filing_event.v1"
accession: "0001062822-23-000033"
form_type: "8-K"
ticker: "LXRX"
cik: "0001062822"
company_name: "LEXICON PHARMACEUTICALS, INC."
filed_at: "2023-07-31T23:59:59+00:00"
generated_at: "2026-06-12T21:43:16.078731+00:00"
event_type: "leadership"
sentiment: "positive"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Lexicon appoints Diane Sullivan to board; Frank Palantoni resigns after 18 years

## Summary
- Diane Sullivan, former chief commercial officer at The Medicines Company, elected to Lexicon board effective July 27, 2023.
- Sullivan will serve on audit committee; received initial stock option for 96,515 shares at $1.94 per share.
- Non-employee director compensation includes $50k annual retainer plus committee fees (audit $10k, comp $7.5k, governance $5k).
- Frank Palantoni resigned after 18 years, with his service culminating in INPEFA approval.
- Sullivan's experience expected to support INPEFA launch and LX9211 program advancement.

## SEC filing metadata
- accession: 0001062822-23-000033
- form_type: 8-K
- ticker: LXRX
- cik: 0001062822
- company_name: LEXICON PHARMACEUTICALS, INC.
- filed_at: 2023-07-31T23:59:59+00:00
- event_type: leadership
- sentiment: positive
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1062822/000106282223000033/0001062822-23-000033-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1062822/000106282223000033/lxrx-20230727.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001062822-23-000033
- JSON: https://secwatch.observer/filing/0001062822-23-000033.json
- Plain text: https://secwatch.observer/filing/0001062822-23-000033.txt

## Key facts
- Executive change
  Diane E. Sullivan was elected as Director at LEXICON PHARMACEUTICALS, INC..
  - Action: elected
  - Role: Director
  source text: Effective July 27, 2023, our board of directors elected Diane E. Sullivan to serve as a member of our board of directors.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1062822/000106282223000033/0001062822-23-000033-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.