Seth Klarman
Baupost Group
Seth Klarman Aon PLC stake
total: 272
Baupost Group AON trades
- Total transactions:
- 2
- New positions:
- 1
- Reduced:
- 1
- Held since:
- 2026 Q1
- Held for:
- 2 quarters
- Latest activity:
- 2026 Q2
According to 2026 Q2 report, Seth Klarman holds 687,000 Aon PLC (AON) shares with a market value of roughly $227.87M accounting for 4.21% of the overall portfolio. To date, the estimated cost basis is nearly $322.78 for "buy" trades and estimated average "sell" price is $331.69. Baupost Group first purchased AON in 2026 Q1, initially acquiring 769,000 shares. Since the initial investment in Aon PLC (AON), Baupost Group has made 1 more transaction.
When did Seth Klarman buy Aon PLC (AON)?
Seth Klarman first invested in Aon PLC (AON) in 2026 Q1 at the reported quarter-end price of $322.78 per share.
What's the cost basis of Baupost Group's AON stake?
The estimated cost basis for Aon PLC (AON) stake is around $322.78 per share. This represents their average reported price* across all buy transactions
Estimated cost basis*
- Weighted AVG buy price:
- $322.78
- Weighted AVG sell price:
- $331.69
Seth Klarman's historical trades in Aon PLC
2 results
| Period |
% of portfolio |
Shares held after* |
Reported price* |
Value* |
% (shares) of activity |
% change to portfolio |
|---|---|---|---|---|---|---|
|
2026 Q2
|
4.21%
|
687,000
|
$331.69
|
$227,871,000
|
-10.66% (-82,000)
|
-0.53%
|
|
2026 Q1
|
4.85%
|
769,000
|
$322.78
|
$248,218,000
|
new
|
+4.85%
|
* 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.