---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-23-196872"
form_type: "8-K"
ticker: "PTEN"
cik: "0000889900"
company_name: "PATTERSON UTI ENERGY INC"
filed_at: "2023-07-28T23:59:59+00:00"
generated_at: "2026-06-12T23:28:49.228391+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Patterson-UTI and NexTier clear HSR waiting period for pending all-stock merger

## Summary
- HSR Act waiting period expired July 27, 2023, satisfying one key closing condition for the merger.
- Merger remains subject to shareholder approvals of both companies and other customary conditions.
- The parties executed a first amendment to the merger agreement related to the Delaware voting standard for the charter amendment proposal.
- Transaction remains on track to close in 2023; no financial terms revised.

## SEC filing metadata
- accession: 0001193125-23-196872
- form_type: 8-K
- ticker: PTEN
- cik: 0000889900
- company_name: PATTERSON UTI ENERGY INC
- filed_at: 2023-07-28T23:59:59+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 1.01, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/889900/000119312523196872/0001193125-23-196872-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/889900/000119312523196872/d496875d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-196872
- JSON: https://secwatch.observer/filing/0001193125-23-196872.json
- Plain text: https://secwatch.observer/filing/0001193125-23-196872.txt

## Key facts
- Material Agreements
  PATTERSON UTI ENERGY INC amended First Amendment to the Merger Agreement with NexTier Oilfield Solutions Inc. (effective 2023-07-27).
  - Action: amendment
  - Agreement: merger
  - Counterparty: NexTier Oilfield Solutions Inc.
  - Effective: 2023-07-27
  source text: On July 27, 2023, Patterson-UTI and NexTier entered into the First Amendment to the Merger Agreement (the “ Amendment ”) with respect to the new voting standard under Delaware law for the Patterson-UTI charter amendment proposal.
  evidence_url: https://www.sec.gov/Archives/edgar/data/889900/000119312523196872/0001193125-23-196872-index.htm

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