---
schema_version: "secwatch.filing_event.v1"
accession: "0001437749-23-034441"
form_type: "8-K"
ticker: "UNP"
cik: "0000100885"
company_name: "UNION PACIFIC CORP"
filed_at: "2023-12-14T23:59:59+00:00"
generated_at: "2026-06-07T12:28:33.374240+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "high"
source: SEC EDGAR
---

# Union Pacific appoints John Tien, former DHS deputy secretary, to board of directors

## Summary
- John Tien elected to board effective December 14, 2023; fills current vacancy.
- Tien most recently served as Deputy Secretary of Homeland Security (2021-2023), overseeing multi-billion-dollar budget and 3,000+ overseas personnel.
- He held senior executive roles at Citigroup for 10 years, including chief administrative officer and chief of staff for global consumer operations.
- Tien served 24 years in U.S. Army (Colonel), three combat tours in Iraq, and as NSC Senior Director for Afghanistan and Pakistan.
- Board determined Tien independent under NYSE standards; no material relationship with Union Pacific.

## SEC filing metadata
- accession: 0001437749-23-034441
- form_type: 8-K
- ticker: UNP
- cik: 0000100885
- company_name: UNION PACIFIC CORP
- filed_at: 2023-12-14T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: high
- sec_items: 5.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/100885/000143774923034441/0001437749-23-034441-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/100885/000143774923034441/unp20231213_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001437749-23-034441
- JSON: https://secwatch.observer/filing/0001437749-23-034441.json
- Plain text: https://secwatch.observer/filing/0001437749-23-034441.txt

## Key facts
- Executive change
  John K. Tien was elected as Director at UNION PACIFIC CORP.
  - Action: elected
  - Role: Director
  source text: The Board of Directors (the Board) of Union Pacific Corporation (the Company) elected John K. Tien, age 60, to serve on the Board as a director of the Company, effective December 14, 2023.
  evidence_url: https://www.sec.gov/Archives/edgar/data/100885/000143774923034441/0001437749-23-034441-index.htm

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