Seth Klarman's Aon plc (AON) position

Yes: as of Q1 2026, Seth Klarman holds 769K shares of AON worth $249M (4.9% of the disclosed portfolio). Last quarter the position was opened. First disclosed Q1 2026.

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Current value

$249M

Shares held

769K

% of portfolio

4.9%

Est. average buy price (i)

$332.53

Quarter-end price

$323.23

Estimated trade prices

Average price in quarters with purchases: $332.53

AON price vs Klarman's position

1Y 3Y 5Y MAX

Dates

Average closing price · filing quarter: $332.53
Price range · filing quarter: $309.97 – $351.97

Every quarterly change

Quarter	Action	Shares change	Est. value change	Δ Own	Shares held	Filing date
Q1 2026	New	+769K	+$256M	–	769K	May 14, 2026

Data through Q1 2026 · filed May 14, 2026

1 grouped rows from 1 quarters

Who else owns AON

Capital World Investors

owns 5.4% of shares outstanding

Est. $3.7B · Shares: 11.5M

Massachusetts Financial Services Co

owns 3.9% of shares outstanding

Est. $2.7B · Shares: 8.4M

Dodge & Cox

owns 3.8% of shares outstanding

Est. $2.6B · Shares: 8.1M

Morgan Stanley

owns 3.0% of shares outstanding

Est. $2.1B · Shares: 6.4M

See all owners of AON →

More Klarman positions

WESCO International, Inc.(WCC)

$393M

7.7% of portfolio

Union Pacific Corporation(UNP)

$370M

7.3% of portfolio

Common questions

Does Seth Klarman own AON?

Yes. As of Q1 2026, Seth Klarman disclosed 769K shares of AON, worth $249M. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

When did Seth Klarman buy AON?

Seth Klarman first disclosed a AON position in Q1 2026; every quarterly buy and sell since is in the table above. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

Did Seth Klarman sell AON?

The quarter-by-quarter table above shows each sale and reduction Seth Klarman disclosed in AON. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

How many shares of AON does Seth Klarman own?

Seth Klarman disclosed 769K shares of AON as of Q1 2026. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

What price did Seth Klarman pay for AON?

Seth Klarman's estimated average buy price for AON is $332.53, from quarter-average prices weighted by the shares added each quarter. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

How are the estimated trade prices calculated?

13F filings disclose quarter-end holdings, not trade dates or execution prices. These estimates use each covered quarter's average market price; the add average excludes the opening position and quarters without price data. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.