Compounder

Mattel Inc

Held by 3 superinvestors (MAT).

Educational data only — not investment advice. 13F positions are self-reported and can lag up to 45 days.

This quarter1 opened2 added1 exited
TickerMAT
Holder count3
Total value held$383.9M
Largest holderJohn Rogers
External
Ownership overview

Mattel Inc (MAT) is held by 3 of the superinvestors tracked on Compounder, with a combined $383.9M in reported 13F value. The largest position belongs to John Rogers, where it makes up 2.2% of the portfolio.

Other notable holders by value include Mason Hawkins (9.2% of its book) and Ray Dalio (0.0% of its book).

Over the latest quarter, 1 of the tracked filers opened a new position in MAT, 2 added to existing ones, 0 trimmed, and 1 sold out entirely.

Holder counts and values reflect the most recent SEC Form 13F filings, through the quarter ended 2026-03-31. Source: SEC EDGAR. A 13F shows only long US-listed positions and can lag the real portfolio by up to 45 days, so this is disclosed long ownership, not a complete picture.

Holders over time

Superinvestors holding this security over the last 8 quarters: 3 → 3.

Early quarters may understate holder counts due to data backfill — read the slope with care.

Superinvestors Holding This Security
  • John Rogers
    Value$197.1MWeight (prev→now)2.7% → 2.2% ▲
  • Mason Hawkins
    Value$186.2MWeight (prev→now)7.6% → 9.2% ▲
  • Ray Dalio
    Value$600,423Weight (prev→now)New · 0.0%
Exited this quarter (1)
Samantha McLemore

Sources· SEC EDGAR 13F as of 2026-05-15

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