Mason Hawkins
Longleaf Partners
Longleaf Partners Portfolio 13F
Mason Hawkins Holdings Activity
- Portfolio value:
- $1.10B≈ (-$36M≈)
- Previous value:
- $1.13B≈
- # of changes:
- 12
- New positions:
- 2
- Reported for:
- 31 Dec 2025 (Q4)
- Latest filing date:
- 02 Mar 2026
Longleaf Partners has disclosed a total of 12 changes to the portfolio in the (2025 Q4) SEC report(s): increased the number of shares of 4, bought 2 totally new and decreased the number of shares of 6 position(s).
What stocks did Mason Hawkins buy in 2025 Q4?
During 2025 Q4 Mason Hawkins has bought 6 securities out of which top 5 purchases (by % change to portfolio) were (PPLI) IAC/INTERACTIVECORP (added shares +3.96%), (EXXRF) Exor NV (added shares +19.70%), (MICC) The Magnum Ice Cream Company N.V (new buy), (RYN) Rayonier Inc (added shares +6.51%) and (PCH) PotlatchDeltic Corp (added shares +22.28%).
In the 2025 Q4 report(s) the following changes have been made to the top investments: (PPLI) IAC/INTERACTIVECORP (added shares +3.96%), (MAT) Mattel Inc (reduced shares -13.65%), (REGN) Regeneron Pharmaceuticals Inc (reduced shares -12.55%), (CNX) CNX Resources Corp (reduced shares -18.03%) and (EXXRF) Exor NV (added shares +19.70%).
12 results
| History | Ticker | Name |
% or activity |
Shares change |
Shares held after* |
% change to portfolio |
Reported price* |
% difference current price* |
% of portfolio |
Held since* | Held for* |
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|
Louisiana-Pacific Corp
|
new
|
+139,811
|
139,811
|
+1.03%
|
$80.76
|
-10.39%($72.37)
|
1.03%
|
2025 Q4
|
≈ 0.25 years
|
|
|
|
The Magnum Ice Cream Company N.V
|
new
|
+3,418,974
|
3,418,974
|
+4.98%
|
$15.97
|
+16.30%($18.57)
|
4.98%
|
2025 Q4
|
≈ 0.25 years
|
|
|
|
PotlatchDeltic Corp
|
+22.28%
|
+235,096
|
1,290,324
|
+0.85%
|
$39.78
|
|
4.68%
|
2025 Q3
|
≈ 0.50 years
|
|
|
|
Exor NV
|
+19.70%
|
+127,780
|
776,425
|
+0.99%
|
$85.12
|
-7.04%($79.12)
|
6.02%
|
2024 Q3
|
≈ 1.50 years
|
|
|
|
Rayonier Inc
|
+6.51%
|
+146,399
|
2,395,437
|
+0.29%
|
$21.65
|
-0.02%($21.64)
|
4.73%
|
2025 Q3
|
≈ 0.50 years
|
|
|
|
IAC/INTERACTIVECORP
|
+3.96%
|
+73,839
|
1,939,606
|
+0.26%
|
$39.10
|
+5.12%($41.10)
|
6.91%
|
2021 Q3
|
≈ 4.50 years
|
|
|
|
Regeneron Pharmaceuticals Inc
|
-12.55%
|
-12,383
|
86,305
|
-0.84%
|
$771.87
|
-1.71%($758.68)
|
6.07%
|
2025 Q1
|
≈ 1.00 year
|
|
|
|
Mattel Inc
|
-13.65%
|
-533,875
|
3,376,670
|
-0.93%
|
$19.84
|
-24.12%($15.06)
|
6.11%
|
2019 Q3
|
≈ 6.50 years
|
|
|
|
Avantor Inc
|
-15.20%
|
-553,218
|
3,086,436
|
-0.56%
|
$11.46
|
+19.37%($13.68)
|
3.22%
|
2025 Q3
|
≈ 0.50 years
|
|
|
|
Bio-Rad Laboratories Inc
|
-16.90%
|
-28,666
|
140,913
|
-0.77%
|
$302.99
|
+7.28%($325.05)
|
3.89%
|
2023 Q2
|
≈ 2.75 years
|
|
* 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.
* Current price: this can be a delayed price and may not reflect the real-time market value, however it is too close.
* Value or Price: If the security is completely sold out, we show the reported value (or price) prior to the actual period.
* Held since / Held for: calculated since the latest "new buy" position. If the security was previously exited and re-entered, only the most recent holding period is counted.