Aon (AON) Stock Buybacks: 36.3% of Shares Retired Since 2010

Name: Aon (AON) shares outstanding since 1999, split adjusted
Creator: Buyback Radar
License: https://creativecommons.org/licenses/by/4.0/

Shares outstanding, 1999 to todaysplit adjusted, from SEC filings

1999, 256,453,4502026-07-28, 212,125,434

A share bought in 1999

1.2× more of Aon today, without buying another share. It was one of 256,453,450 shares then. It is one of 212,125,434 now.

Every filing we read27 fiscal years, split adjusted

Fiscal year	Date	Shares outstanding	Filing
1999	2000-02-23	256,453,450	10-K	cover page
2000	2001-02-21	261,338,989	10-K	cover page
2001	2002-02-25	271,430,890	10-K	cover page
2002	2003-02-28	311,518,091	10-K	cover page
2003	2004-02-27	314,719,764	10-K	cover page
2004	2005-02-28	317,464,955	10-K	cover page
2005	2006-01-31	321,956,147	10-K	cover page
2006	2007-01-31	298,375,565	10-K	cover page
2007	2008-01-31	305,525,469	10-K	cover page
2008	2009-01-30	273,538,245	10-K	cover page
2009	2010-01-29	266,851,500	10-K
2010	2011-01-31	333,088,304	10-K
2011	2012-01-31	325,179,163	10-K
2012	2013-01-31	311,573,644	10-K
2013	2014-01-31	301,100,416	10-K
2014	2015-01-31	280,250,522	10-K
2015	2016-02-05	270,081,701	10-K
2016	2017-02-22	262,600,762	10-K
2017	2018-02-16	246,180,510	10-K
2018	2019-02-15	239,999,442	10-K
2019	2020-02-13	231,582,094	10-K
2020	2021-02-18	225,984,346	10-K
2021	2022-02-17	213,944,460	10-K
2022	2023-02-16	205,142,379	10-K
2023	2024-02-16	198,297,735	10-K
2024	2025-02-14	216,001,106	10-K
2025	2026-02-12	214,254,496	10-K

Source: all 10-K filings of Aon on EDGAR. Download this series as CSV. Licence CC BY 4.0, credit Buyback Radar.

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Aon buybacks, answered

Is Aon buying back its stock?

Yes. Aon has 1.3% fewer shares outstanding than twelve months ago, 212,125,434 as of July 28, 2026. Over five years the share count is down 3.7%.

How many shares has Aon bought back?

Net of every new share it issued, Aon has 121.0 million fewer shares than at its 2010 peak. That is 36.3% of the company.

How many shares does Aon have outstanding?

212,125,434 shares, as of July 28, 2026, from the cover page of its latest 10-Q. At the 2010 peak it had 333,088,304.

What do Aon's buybacks mean for a shareholder?

Each share is a bigger slice of the company. Someone who held Aon stock in 2010 owns 1.6 times as much of the business today without buying another share. Whether that was a good use of cash depends on the price paid.

How does Aon compare with other cannibal stocks?

Aon ranks No. 57 of 65 companies on Buyback Radar by share of the company retired since its peak. Close to it on the list: Copart (37.3%), Columbia Sportswear (36.5%), CNX Resources (35.8%), Aptiv (34.1%).

Every answer is computed from Aon's own SEC filings and rebuilt every Monday. Latest count: 10-Q on EDGAR.

Insider buying, last 12 months

KNIGHT LESTER BDirector2026-09-02, 20,000 shares at $327.48 $6.5M total

KNIGHT LESTER BDirector2026-02-10, 4,000 shares at $319.24 $1.3M total

The story

The numbers say what happened. The story says whether it can continue. We cover companies like Aon in depth on Cannibal Stocks.

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