Mason Hawkins
Longleaf Partners
Mason Hawkins Mattel Inc stake
total: 52
Longleaf Partners MAT trades
- Total transactions:
- 15
- New positions:
- 1
- Added:
- 3
- Reduced:
- 11
- Held since:
- 2019 Q3
- Held for:
- 27 quarters
- Latest activity:
- 2026 Q1
According to 2026 Q1 report, Mason Hawkins holds 5,093,424 Mattel Inc (MAT) shares with a market value of roughly $74.01M accounting for 7.03% of the overall portfolio. To date, the estimated cost basis is nearly $12.29 for "buy" trades and estimated average "sell" price is $16.95. Longleaf Partners first purchased MAT in 2019 Q3, initially acquiring about 9.96M shares. Since the initial investment in Mattel Inc (MAT), Longleaf Partners has made 14 more transactions.
When did Mason Hawkins buy Mattel Inc (MAT)?
Mason Hawkins first invested in Mattel Inc (MAT) in 2019 Q3 at the reported quarter-end price of $11.39 per share.
What's the cost basis of Longleaf Partners's MAT stake?
The estimated cost basis for Mattel Inc (MAT) stake is around $12.29 per share. This represents their average reported price* across all buy transactions
Estimated cost basis*
- Weighted AVG buy price:
- $12.29
- Weighted AVG sell price:
- $16.95
Mason Hawkins's historical trades in Mattel Inc
15 results
| Period |
% of portfolio |
Shares held after* |
Reported price* |
Value* |
% (shares) of activity |
% change to portfolio |
|---|---|---|---|---|---|---|
|
2026 Q1
|
7.03%
|
5,093,424
|
$14.53
|
$74,007,451
|
+50.84% (+1,716,754)
|
+2.37%
|
|
2025 Q4
|
6.11%
|
3,376,670
|
$19.84
|
$66,993,133
|
-13.65% (-533,875)
|
-0.93%
|
|
2025 Q3
|
5.81%
|
3,910,545
|
$16.83
|
$65,814,472
|
+12.91% (+447,058)
|
+0.66%
|
|
2025 Q2
|
5.78%
|
3,463,487
|
$19.72
|
$68,299,964
|
-0.82% (-28,509)
|
-0.05%
|
|
2025 Q1
|
5.83%
|
3,491,996
|
$19.43
|
$67,849,482
|
-7.44% (-280,502)
|
-0.43%
|
|
2023 Q2
|
5.37%
|
3,772,498
|
$19.54
|
$73,714,611
|
-9.62% (-401,369)
|
-0.59%
|
|
2023 Q1
|
5.74%
|
4,173,867
|
$18.41
|
$76,840,891
|
-4.91% (-215,402)
|
-0.32%
|
|
2022 Q4
|
6.33%
|
4,389,269
|
$17.84
|
$78,304,559
|
+14.35% (+550,921)
|
+0.79%
|
|
2022 Q3
|
6.11%
|
3,838,348
|
$18.94
|
$72,698,311
|
-12.05% (-525,893)
|
-0.69%
|
|
2022 Q1
|
5.54%
|
4,364,241
|
$22.21
|
$96,929,793
|
-19.01% (-1,024,134)
|
-1.27%
|
|
2021 Q4
|
6.47%
|
$21.56
|
-5.28% (-300,419)
|
|||
|
2021 Q1
|
6.01%
|
$19.92
|
-3.15% (-184,745)
|
|||
|
2020 Q4
|
6.28%
|
$17.45
|
-29.45% (-2,451,604)
|
|||
|
2020 Q1
|
6.23%
|
$8.81
|
-16.38% (-1,630,908)
|
|||
|
2019 Q3
|
6.37%
|
$11.39
|
new
|
|||
* Shares, change to shares, sold shares, shares held after: split-adjusted.
* Reported price: this doesn't represent the actual buy or sell price. It is the split-adjusted price of the security as of the last day of the reported period.
If the security is completely sold out, we show the reported split-adjusted price prior to the actual period.
If the security is completely sold out, we show the reported split-adjusted price prior to the actual period.
* Estimated cost basis: based on "Reported price*" (not earlier than 2013 Q2). Calculation starts from the latest "new buy" activity to the latest "close out" activity (if any).
* Value or Price: If the security is completely sold out, we show the reported value (or price) prior to the actual period.
* New buy or own: this means there is no earlier reporting (for us or in general). So we can't know if the actual purchase of the security happened at the reported period or earlier.