---
schema_version: "secwatch.filing_event.v1"
accession: "0000097745-23-000072"
form_type: "8-K"
ticker: "TMO"
cik: "0000097745"
company_name: "THERMO FISHER SCIENTIFIC INC."
filed_at: "2023-11-07T23:59:59+00:00"
generated_at: "2026-06-08T18:48:07.309848+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.25
calibrated_materiality_score: 0.25
confidence: "high"
source: SEC EDGAR
---

# Thermo Fisher Scientific 401(k) blackout Dec 21 to Jan 14 due to plan admin transition

## Summary
- 401(k) plan transitioning to a new administrator, causing temporary suspension of participant transactions.
- Blackout period expected from 4:00pm ET Dec 21, 2023 through week of Jan 14, 2024.
- Participants cannot change contributions, investment allocations, loans, or withdrawals during blackout.
- Directors and executive officers prohibited from trading TMO common stock under Regulation BTR during blackout.
- Notice sent to directors/executive officers on Nov 7, 2023; shareholders may obtain blackout dates by contacting Corporate Secretary.

## SEC filing metadata
- accession: 0000097745-23-000072
- form_type: 8-K
- ticker: TMO
- cik: 0000097745
- company_name: THERMO FISHER SCIENTIFIC INC.
- filed_at: 2023-11-07T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.25
- calibrated_materiality_score: 0.25
- confidence: high
- sec_items: 5.04, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/97745/000009774523000072/0000097745-23-000072-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/97745/000009774523000072/tmo-20231107.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000097745-23-000072
- JSON: https://secwatch.observer/filing/0000097745-23-000072.json
- Plain text: https://secwatch.observer/filing/0000097745-23-000072.txt

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