Mason Hawkins
Longleaf Partners
Mason Hawkins Affiliated Managers Group, Inc stake
total: 52
Longleaf Partners AMG trades
- Total transactions:
- 8
- New positions:
- 1
- Sold out:
- 1
- Added:
- 1
- Reduced:
- 5
- Held since:
- 2019 Q3
- Held for:
- 23 quarters
- Latest activity:
- 2025 Q2
According to 2026 Q1 report, Mason Hawkins doesn't hold any Affiliated Managers Group, Inc (AMG) shares. To date, the estimated cost basis is nearly $82.82 for "buy" trades and estimated average "sell" price is $161.94. Longleaf Partners first purchased AMG in 2019 Q3, initially acquiring 975,850 shares. Since the initial investment in Affiliated Managers Group, Inc (AMG), Longleaf Partners has made 7 more transactions.
When did Mason Hawkins sell Affiliated Managers Group, Inc (AMG)?
Mason Hawkins sold off the entire Affiliated Managers Group, Inc (AMG) position in 2025 Q2.
When did Mason Hawkins buy Affiliated Managers Group, Inc (AMG)?
Mason Hawkins first invested in Affiliated Managers Group, Inc (AMG) in 2019 Q3 at the reported quarter-end price of $83.35 per share.
What's the cost basis of Longleaf Partners's AMG stake?
The estimated cost basis for Affiliated Managers Group, Inc (AMG) stake is around $82.82 per share. This represents their average reported price* across all buy transactions
Estimated cost basis*
- Weighted AVG buy price:
- $82.82
- Weighted AVG sell price:
- $161.94
Mason Hawkins's historical trades in Affiliated Managers Group, Inc
8 results
| Period |
% of portfolio |
Shares held after* |
Reported price* |
Value* |
% (shares) of activity |
% change to portfolio |
|---|---|---|---|---|---|---|
|
2025 Q2
|
0.00%
|
0
|
$168.03
|
|
-100% (-326,197)
|
-4.71%
|
|
2025 Q1
|
4.71%
|
326,197
|
$168.03
|
$54,810,882
|
-25.89% (-113,958)
|
-1.5%
|
|
2024 Q3
|
5.73%
|
440,155
|
$177.80
|
$78,259,559
|
-10.58% (-52,097)
|
-0.73%
|
|
2022 Q4
|
6.31%
|
492,252
|
$158.43
|
$77,987,484
|
-20.48% (-126,774)
|
-1.69%
|
|
2021 Q4
|
5.67%
|
619,026
|
$164.51
|
$101,835,967
|
-16.04% (-118,245)
|
-1.11%
|
|
2021 Q1
|
5.83%
|
737,271
|
$149.03
|
$109,875,497
|
-26.11% (-260,516)
|
-2.38%
|
|
2020 Q1
|
5.02%
|
$59.14
|
+2.25% (+21,937)
|
|||
|
2019 Q3
|
4.57%
|
$83.35
|
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.