Ole Andreas Halvorsen
Viking Global Investors
Ole Andreas Halvorsen Aon PLC stake
total: 670
Viking Global Investors AON trades
- Total transactions:
- 32
- New positions:
- 7
- Sold out:
- 6
- Added:
- 13
- Reduced:
- 6
- Held since:
- 2025 Q3
- Held for:
- 4 quarters
- Latest activity:
- 2026 Q2
According to 2026 Q2 report, Ole Andreas Halvorsen holds 1,151,269 Aon PLC (AON) shares with a market value of roughly $381.86M accounting for 1.09% of the overall portfolio. To date, the estimated cost basis is nearly $349.93 for "buy" trades and estimated average "sell" price is $352.88. Viking Global Investors first purchased AON in 2014 Q3, initially acquiring about 1.66M shares. Ole Andreas Halvorsen later completely sold out the position and invested in Aon PLC again in 2025 Q3. Since the initial investment in Aon PLC (AON), Viking Global Investors has made 31 more transactions.
When did Ole Andreas Halvorsen buy Aon PLC (AON)?
Ole Andreas Halvorsen first invested in Aon PLC (AON) in 2014 Q3 at the reported quarter-end price of $87.67 per share.
What's the cost basis of Viking Global Investors's AON stake?
The estimated cost basis for Aon PLC (AON) stake is around $349.93 per share. This represents their average reported price* across all buy transactions
Estimated cost basis*
- Weighted AVG buy price:
- $349.93
- Weighted AVG sell price:
- $352.88
Ole Andreas Halvorsen's historical trades in Aon PLC
32 results
| Period |
% of portfolio |
Shares held after* |
Reported price* |
Value* |
% (shares) of activity |
% change to portfolio |
|---|---|---|---|---|---|---|
|
2026 Q2
|
1.09%
|
1,151,269
|
$331.69
|
$381,864,415
|
+5.90% (+64,155)
|
+0.06%
|
|
2026 Q1
|
0.98%
|
1,087,114
|
$322.78
|
$350,898,657
|
+38.72% (+303,464)
|
+0.27%
|
|
2025 Q4
|
0.73%
|
783,650
|
$352.88
|
$276,534,412
|
-44.60% (-630,968)
|
-0.58%
|
|
2025 Q3
|
1.31%
|
1,414,618
|
$356.58
|
$504,424,486
|
new
|
+1.31%
|
|
2025 Q1
|
0.00%
|
0
|
$359.16
|
|
-100% (-720,364)
|
-0.84%
|
|
2024 Q4
|
0.84%
|
720,364
|
$359.16
|
$258,725,934
|
+27.94% (+157,337)
|
+0.18%
|
|
2024 Q3
|
0.71%
|
563,027
|
$345.99
|
$194,801,712
|
new
|
+0.71%
|
|
2022 Q3
|
0.00%
|
0
|
$269.68
|
|
-100% (-704,639)
|
-0.87%
|
|
2022 Q2
|
0.87%
|
704,639
|
$269.68
|
$190,027,000
|
-55.77% (-888,441)
|
-0.97%
|
|
2022 Q1
|
2.10%
|
1,593,080
|
$325.63
|
$518,755,000
|
+5.47% (+82,563)
|
+0.11%
|
|
2021 Q4
|
1.31%
|
$300.56
|
new
|
|||
|
2021 Q3
|
0.00%
|
$238.76
|
-100% (-2,903,054)
|
|||
|
2021 Q2
|
2.10%
|
$238.76
|
+34.74% (+748,565)
|
|||
|
2021 Q1
|
1.48%
|
$230.11
|
-16.19% (-416,131)
|
|||
|
2020 Q4
|
1.49%
|
$211.27
|
-14.68% (-442,286)
|
|||
|
2020 Q3
|
2.25%
|
$206.30
|
+1.92% (+56,877)
|
|||
|
2020 Q2
|
2.46%
|
$192.60
|
+29.05% (+665,509)
|
|||
|
2020 Q1
|
1.97%
|
$165.04
|
+196.69% (+1,518,493)
|
|||
|
2019 Q4
|
0.75%
|
$208.29
|
-2.61% (-20,730)
|
|||
|
2019 Q3
|
0.80%
|
$193.57
|
-6.93% (-59,021)
|
|||
|
2019 Q2
|
0.74%
|
$192.98
|
+30.20% (+197,554)
|
|||
|
2019 Q1
|
0.64%
|
$170.70
|
+24.90% (+130,417)
|
|||
|
2018 Q4
|
0.43%
|
$145.36
|
+8.48% (+40,939)
|
|||
|
2018 Q3
|
0.41%
|
$153.78
|
new
|
|||
|
2016 Q3
|
0.00%
|
$109.23
|
-100% (-703,995)
|
|||
|
2016 Q2
|
0.33%
|
$109.23
|
+23.17% (+132,439)
|
|||
|
2016 Q1
|
0.26%
|
$104.45
|
new
|
|||
|
2015 Q3
|
0.00%
|
$99.68
|
-100% (-1,912,946)
|
|||
|
2015 Q2
|
0.72%
|
$99.68
|
+124.06% (+1,059,185)
|
|||
|
2015 Q1
|
0.32%
|
$96.12
|
new
|
|||
|
2014 Q4
|
0.00%
|
$87.67
|
-100% (-1,662,625)
|
|||
|
2014 Q3
|
0.59%
|
$87.67
|
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.