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Aon director buys 20,000 shares in open market

Aon plc director Lester B. Knight disclosed open-market purchases totaling 20,000 AON shares via a family partnership, adding to his direct and indirect holdings.

Filing Impact
(Very High)
Filing Sentiment
(Very Positive)
Form Type
4

Rhea-AI Filing Summary

Aon plc (AON) director Lester B. Knight reported a series of open-market purchases of Class A Ordinary Stock on September 2, 2026 through a family partnership, totaling 20,000 shares at weighted-average prices between about $325 and $331 per share. No Rule 10b5-1 trading plan is reported. Following these transactions, Knight is shown with 5,227 shares held directly and additional indirect holdings through his spouse and a personal revocable trust.

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Insider KNIGHT LESTER B
Role Director
Bought 20,000 shs ($6.55M)
Type Security Shares Price Value
Purchase Class A Ordinary Stock F1 1,739 $325.63 $566K
Purchase Class A Ordinary Stock F2 5,097 $326.53 $1.66M
Purchase Class A Ordinary Stock F3 7,212 $327.52 $2.36M
Purchase Class A Ordinary Stock F4 4,145 $328.34 $1.36M
Purchase Class A Ordinary Stock F5 1,440 $329.69 $475K
Purchase Class A Ordinary Stock F6 367 $330.51 $121K
holding Class A Ordinary Stock -- -- --
holding Class A Ordinary Stock -- -- --
holding Class A Ordinary Stock -- -- --
Holdings After Transaction: Class A Ordinary Stock — 163,000 shares (Indirect, By Family Partnership); Class A Ordinary Stock — 5,227 shares (Direct); Class A Ordinary Stock — 124,604 shares (Indirect, By Wife); Class A Ordinary Stock — 26,033 shares (Indirect, Personal Revocable Trust)
Footnotes (6)
  1. F1. The price reported is a weighted average price. Shares were purchased in a series of transactions within the same trading day at prices ranging from $325.03 to $326.02, inclusive. Full information regarding the number of shares purchased at each separate price is available upon request by the Commission staff, the issuer, or a security holder of the issuer.
  2. F2. The price reported is a weighted average price. Shares were purchased in a series of transactions within the same trading day at prices ranging from $326.03 to $327.02, inclusive. Full information regarding the number of shares purchased at each separate price is available upon request by the Commission staff, the issuer, or a security holder of the issuer.
  3. F3. The price reported is a weighted average price. Shares were purchased in a series of transactions within the same trading day at prices ranging from $327.04 to $328.03, inclusive. Full information regarding the number of shares purchased at each separate price is available upon request by the Commission staff, the issuer, or a security holder of the issuer.
  4. F4. The price reported is a weighted average price. Shares were purchased in a series of transactions within the same trading day at prices ranging from $328.04 to $329.03, inclusive. Full information regarding the number of shares purchased at each separate price is available upon request by the Commission staff, the issuer, or a security holder of the issuer.
  5. F5. The price reported is a weighted average price. Shares were purchased in a series of transactions within the same trading day at prices ranging from $329.08 to $330.07, inclusive. Full information regarding the number of shares purchased at each separate price is available upon request by the Commission staff, the issuer, or a security holder of the issuer.
  6. F6. The price reported is a weighted average price. Shares were purchased in a series of transactions within the same trading day at prices ranging from $330.09 to $330.88, inclusive. Full information regarding the number of shares purchased at each separate price is available upon request by the Commission staff, the issuer, or a security holder of the issuer.
Total shares purchased 20,000 shares Class A Ordinary Stock purchased on September 2, 2026 via family partnership
Largest single purchase block 7,212 shares Purchased on September 2, 2026 at a weighted-average price of $327.52
Purchase price range (footnote F1) $325.03–$326.02 per share Prices for transactions included in the 1,739-share weighted-average block at $325.63
Highest stated weighted-average price $330.51 per share Weighted-average for a 367-share purchase block on September 2, 2026
Direct holdings after transaction 5,227 shares Class A Ordinary Stock held directly by Lester B. Knight as of September 2, 2026
Indirect holdings by wife 124,604 shares Class A Ordinary Stock held indirectly, noted as “By Wife”
Indirect holdings by personal revocable trust 26,033 shares Class A Ordinary Stock held indirectly through a Personal Revocable Trust
Class A Ordinary Stock financial
"reported purchases of Class A Ordinary Stock on September 2, 2026"
weighted average price financial
"The price reported is a weighted average price. Shares were purchased"
Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.
Family Partnership financial
"indirect ownership noted as By Family Partnership for the purchases"
indirect ownership financial
"shares reported as indirect ownership By Wife and Personal Revocable Trust"
Personal Revocable Trust financial
"indirect holdings described as held by a Personal Revocable Trust"

FAQ

What insider transactions did AON director Lester B. Knight report on this Form 4?
He reported six open-market purchases of Aon plc Class A Ordinary Stock on September 2, 2026 through a family partnership, totaling 20,000 shares at weighted-average prices in the mid-$320s to around $331 per share.

How many AON shares did the family partnership buy and at what prices?
The family partnership bought 20,000 shares in blocks of 1,739; 5,097; 7,212; 4,145; 1,440; and 367 shares at weighted-average prices of $325.63 to $330.51, with each price footnote stating purchases occurred within specified intraday price ranges.

Were Lester B. Knight’s AON share purchases made under a Rule 10b5-1 trading plan?
No. The filing’s Rule 10b5-1 checkbox is not selected, and no footnote states that the trades were made pursuant to a Rule 10b5-1 or other pre-arranged trading plan.

What are Lester B. Knight’s reported direct holdings of AON after these transactions?
He is reported as holding 5,227 shares of Aon plc Class A Ordinary Stock directly as of September 2, 2026, separate from his indirect holdings through related parties and entities.

What indirect AON holdings does Lester B. Knight report on this Form 4?
He reports 124,604 shares held indirectly “By Wife” and 26,033 shares held indirectly through a Personal Revocable Trust, in addition to the shares held through the family partnership that executed the reported purchases.

Does this Form 4 show any sales or derivative transactions in AON by Lester B. Knight?
No. The filing shows only purchases of Class A Ordinary Stock totaling 20,000 shares and no reported sales or derivative transactions such as option exercises, conversions, or gifts.

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SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
KNIGHT LESTER B
(Last)(First)(Middle)
200 EAST RANDOLPH ST.
(Street)
CHICAGO ILLINOIS 60601
(City)(State)(Zip)
UNITED STATES
(Country)		2. Issuer Name and Ticker or Trading Symbol
Aon plc [ AON ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
09/02/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Class A Ordinary Stock09/02/2026P1,739A$325.63(1)144,739IBy Family Partnership
Class A Ordinary Stock09/02/2026P5,097A$326.53(2)149,836IBy Family Partnership
Class A Ordinary Stock09/02/2026P7,212A$327.52(3)157,048IBy Family Partnership
Class A Ordinary Stock09/02/2026P4,145A$328.34(4)161,193IBy Family Partnership
Class A Ordinary Stock09/02/2026P1,440A$329.69(5)162,633IBy Family Partnership
Class A Ordinary Stock09/02/2026P367A$330.51(6)163,000IBy Family Partnership
Class A Ordinary Stock5,227D
Class A Ordinary Stock124,604IBy Wife
Class A Ordinary Stock26,033IPersonal Revocable Trust
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. The price reported is a weighted average price. Shares were purchased in a series of transactions within the same trading day at prices ranging from $325.03 to $326.02, inclusive. Full information regarding the number of shares purchased at each separate price is available upon request by the Commission staff, the issuer, or a security holder of the issuer.
2. The price reported is a weighted average price. Shares were purchased in a series of transactions within the same trading day at prices ranging from $326.03 to $327.02, inclusive. Full information regarding the number of shares purchased at each separate price is available upon request by the Commission staff, the issuer, or a security holder of the issuer.
3. The price reported is a weighted average price. Shares were purchased in a series of transactions within the same trading day at prices ranging from $327.04 to $328.03, inclusive. Full information regarding the number of shares purchased at each separate price is available upon request by the Commission staff, the issuer, or a security holder of the issuer.
4. The price reported is a weighted average price. Shares were purchased in a series of transactions within the same trading day at prices ranging from $328.04 to $329.03, inclusive. Full information regarding the number of shares purchased at each separate price is available upon request by the Commission staff, the issuer, or a security holder of the issuer.
5. The price reported is a weighted average price. Shares were purchased in a series of transactions within the same trading day at prices ranging from $329.08 to $330.07, inclusive. Full information regarding the number of shares purchased at each separate price is available upon request by the Commission staff, the issuer, or a security holder of the issuer.
6. The price reported is a weighted average price. Shares were purchased in a series of transactions within the same trading day at prices ranging from $330.09 to $330.88, inclusive. Full information regarding the number of shares purchased at each separate price is available upon request by the Commission staff, the issuer, or a security holder of the issuer.
/s/ Colby Alexis - Colby Alexis pursuant to a power of attorney from Lester Knight09/03/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR