---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-22-074316"
form_type: "8-K"
ticker: "MPLX"
cik: "0001552000"
company_name: "MPLX LP"
filed_at: "2022-03-14T23:59:59+00:00"
generated_at: "2026-06-26T23:12:26.407032+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.4
calibrated_materiality_score: 0.4
confidence: "low"
source: SEC EDGAR
---

# MPLX LP files underwriting agreement and indenture for debt issuance; terms not disclosed

## Summary
- Underwriting agreement dated March 10, 2022 with Citigroup, RBC Capital Markets, and TD Securities for a new debt offering.
- Twenty-fifth supplemental indenture dated March 14, 2022 with Bank of New York Mellon as trustee.
- Specific terms (principal amount, interest rate, maturity) are not provided in the 8-K body.
- Opinion of Jones Day on legality of the notes also filed.

## SEC filing metadata
- accession: 0001193125-22-074316
- form_type: 8-K
- ticker: MPLX
- cik: 0001552000
- company_name: MPLX LP
- filed_at: 2022-03-14T23:59:59+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.4
- calibrated_materiality_score: 0.4
- confidence: low
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1552000/000119312522074316/0001193125-22-074316-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1552000/000119312522074316/d474104d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-22-074316
- JSON: https://secwatch.observer/filing/0001193125-22-074316.json
- Plain text: https://secwatch.observer/filing/0001193125-22-074316.txt

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