---
schema_version: "secwatch.filing_event.v1"
accession: "0001595974-25-000035"
form_type: "8-K"
ticker: "MGNI"
cik: "0001595974"
company_name: "MAGNITE, INC."
filed_at: "2025-09-16T23:59:59+00:00"
generated_at: "2026-05-17T06:29:59.834889+00:00"
event_type: "litigation"
sentiment: "neutral"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Magnite files antitrust lawsuit against Google over ad tech monopoly, citing April 2025 ruling

## Summary
- Lawsuit filed Sep 16, 2025 in E.D. Virginia seeking financial damages and other remedies.
- Based on April 2025 court finding that Google willfully engaged in anticompetitive acts in ad tech.
- Magnite alleges Google locked publishers into its ad server and preferenced its own exchange.
- Risk factor update warns of possible retaliatory actions by Google, a major partner and competitor.
- Magnite (MGNI) represented by Kressin Powers LLC; full complaint available online.

## SEC filing metadata
- accession: 0001595974-25-000035
- form_type: 8-K
- ticker: MGNI
- cik: 0001595974
- company_name: MAGNITE, INC.
- filed_at: 2025-09-16T23:59:59+00:00
- event_type: litigation
- sentiment: neutral
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 7.01, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1595974/000159597425000035/0001595974-25-000035-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1595974/000159597425000035/mgni-20250916.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001595974-25-000035
- JSON: https://secwatch.observer/filing/0001595974-25-000035.json
- Plain text: https://secwatch.observer/filing/0001595974-25-000035.txt

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