---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-23-032368"
form_type: "8-K"
ticker: "MAT"
cik: "0000063276"
company_name: "MATTEL INC /DE/"
filed_at: "2023-09-15T23:59:59+00:00"
generated_at: "2026-06-10T16:54:09.034429+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.15
calibrated_materiality_score: 0.15
confidence: "high"
source: SEC EDGAR
---

# Mattel amends bylaws to update shareholder nomination and proposal procedures

## Summary
- Board approved amendments to Amended and Restated Bylaws effective Sept 14, 2023.
- New procedural and disclosure requirements for director nominations and other business proposals by stockholders.
- Stockholders must disclose certain equity-related financial transactions; proxy cards must be non-white.
- Amendments conform to Delaware law changes on electronic transmission of notices and in-person stock voting.
- Non-compliance or materially inaccurate disclosure will cause nominations/proposals to be disregarded.

## SEC filing metadata
- accession: 0001628280-23-032368
- form_type: 8-K
- ticker: MAT
- cik: 0000063276
- company_name: MATTEL INC /DE/
- filed_at: 2023-09-15T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.15
- calibrated_materiality_score: 0.15
- confidence: high
- sec_items: 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/63276/000162828023032368/0001628280-23-032368-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/63276/000162828023032368/mat-20230914.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-23-032368
- JSON: https://secwatch.observer/filing/0001628280-23-032368.json
- Plain text: https://secwatch.observer/filing/0001628280-23-032368.txt

## Key facts
- Governance Changes
  MATTEL INC /DE/: Amended Bylaws to update procedural and disclosure requirements for stockholder nominations and proposals, and to reflect Delaware law changes on electronic transmission and in-person voting (effective 2023-09-14).
  - Change: bylaw amendment
  - Effective: 2023-09-14
  source text: On September 14, 2023, the Board of Directors (the “Board”) of Mattel, Inc. (the “Company”) approved amendments to the Company’s Amended and Restated Bylaws (the “Bylaws”), which became effective immediately.
  evidence_url: https://www.sec.gov/Archives/edgar/data/63276/000162828023032368/0001628280-23-032368-index.htm

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