---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-24-142562"
form_type: "8-K"
ticker: "MPLX"
cik: "0001552000"
company_name: "MPLX LP"
filed_at: "2024-05-20T23:59:59+00:00"
generated_at: "2026-06-01T12:39:10.454104+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 supplemental indenture for debt offering; terms not disclosed in filing

## Summary
- Underwriting Agreement dated May 15, 2024 with Mizuho, RBC, TD Securities as representatives.
- Twenty-Ninth Supplemental Indenture dated May 20, 2024 with Bank of New York Mellon as Trustee.
- Jones Day opinion filed along with the documents as exhibits to existing S-3 registration.
- No principal amount, interest rate, maturity, or use of proceeds provided in the 8-K text.

## SEC filing metadata
- accession: 0001193125-24-142562
- form_type: 8-K
- ticker: MPLX
- cik: 0001552000
- company_name: MPLX LP
- filed_at: 2024-05-20T23:59:59+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/1552000/000119312524142562/0001193125-24-142562-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1552000/000119312524142562/d839755d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-24-142562
- JSON: https://secwatch.observer/filing/0001193125-24-142562.json
- Plain text: https://secwatch.observer/filing/0001193125-24-142562.txt

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