---
schema_version: "secwatch.filing_event.v1"
accession: "0001595974-25-000030"
form_type: "8-K"
ticker: "MGNI"
cik: "0001595974"
company_name: "MAGNITE, INC."
filed_at: "2025-09-05T23:59:59+00:00"
generated_at: "2026-05-17T07:57:37.795984+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "medium"
source: SEC EDGAR
---

# Magnite expands office sublease with Zillow, adding 8th floor space

## Summary
- Entered First Amendment to Sublease with Zillow Group, effective November 1, 2025.
- Adds entire 8th floor to previously leased 9th floor premises.
- Full terms of the amendment to be filed in Q3 2025 10-Q.
- No financial terms (rent, square footage) disclosed in this 8-K.

## SEC filing metadata
- accession: 0001595974-25-000030
- form_type: 8-K
- ticker: MGNI
- cik: 0001595974
- company_name: MAGNITE, INC.
- filed_at: 2025-09-05T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: medium
- sec_items: 1.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1595974/000159597425000030/0001595974-25-000030-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1595974/000159597425000030/mgni-20250831.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001595974-25-000030
- JSON: https://secwatch.observer/filing/0001595974-25-000030.json
- Plain text: https://secwatch.observer/filing/0001595974-25-000030.txt

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