Mattel (MAT): EdgePoint Investment Group Inc. disclosed a 17.7% stake in MAT and may seek to influence the company 17.7%

17.7%

Stake

50.5M

Shares owned

Stake as of

Oct 21, 2026

Filed

Oct 22, 2026

The story around this disclosure

Every dated public record OQRO holds about the company from 60 days before to 120 days after, oldest first. It shows what was going on; none of it is a stated reason for the trade.

1. Sep 29, 2026Company filing · Form 8-K · Executive change, Reg FDChanged a top executive or board member, and shared information with investors“On September 30, 2026, Mattel, Inc. (the “Company” or “Mattel”) announced that the Board of Directors (the “Board”) of the Company has appointed Roger Lynch, current Board member and Independent Lead Director, as Chairman of the Board and Diana Ferguson as its new Independent Lead Director, effective October 2, 2026, and that the Board has appointed Roger Lynch as the Chief Executive Officer of the Company,…”
2. Oct 12, 2026Company filing · Form 8-K · Executive changeChanged a top executive or board member“On October 12, 2026, Mattel, Inc. (the “Company” or “Mattel”) entered into an amendment (the “Amendment”) to the letter agreement, dated September 29, 2026, between the Company and Roger Lynch (the “Offer Letter”), with respect to Mr. Lynch’s service as the Company’s Chief Executive Officer.”
3. Oct 19, 2026Company filing · Form 8-K · Executive change, Reg FDChanged a top executive or board member, and shared information with investors“On October 19, 2026, Mattel, Inc. (the “Company” or “Mattel”) announced that Peter Griffith has been appointed Chief Financial Officer of the Company (“CFO”) and as a non-independent director of the Board of Directors of the Company (the “Board”), in each case effective October 20, 2026 (the “Start Date”).”

What came next

1. Oct 22, 20265% stakeEdgePoint Investment Group Inc. filed an activist stake (13D) of 17.7%

How to read SEC Schedule 13D

A Schedule 13D and a Schedule 13G both disclose beneficial ownership of more than 5% of a US company's voting shares. A 13D is the long form, filed by holders who may seek to influence or control the company, and it must state what they intend to do. A 13G is the short form, open only to passive holders and to certain institutions holding in the ordinary course of business, and it asks no question about intent.

Full guide: Schedule 13D vs Schedule 13G: what is the difference?

What else is on file for Mattel

For Mattel, OQRO holds 5 fund holdings reports (13F) dated in the last 90 days.

These are records OQRO holds, counted by their date, not a measure of how much trading took place. Routine paperwork such as option exercises and tax withholding is left out. Everything for the company is on its MAT page.

How this filing works

• Schedule 13D vs 13G

Other disclosures at Mattel

• SEC Form 13F-HRAug 14, 2026
• SEC Form 13F-HRAug 14, 2026
• SEC Form 13F-HRAug 14, 2026
• SEC Form 13F-HRAug 14, 2026
• SEC Form 13F-HRMay 15, 2026
• SEC Form 13F-HRMay 15, 2026

Everything OQRO holds on this company is on its MAT page.