=== SEC Form 4 — Statement of Changes in Beneficial Ownership ===
Document Type: 4
Period of Report: 2026-09-02
10b5-1 Pre-arranged Plan: No
--- Issuer ---
Name: Aon plc (AON)
CIK: 0000315293
--- Reporting Owner ---
Name: KNIGHT LESTER B
CIK: 0001023262
Role: Director
--- Non-Derivative Transactions ---
[Transaction #1]
Security: Class A Ordinary Stock
Date: 2026-09-02 | Code: P (Open market purchase)
Shares: +1,739 | Price: $325.63
Total Value: $566,270.57
Shares Owned After: 144,739 | Ownership: I (Indirect) | Nature: By Family Partnership
Footnotes:
[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.
[Transaction #2]
Security: Class A Ordinary Stock
Date: 2026-09-02 | Code: P (Open market purchase)
Shares: +5,097 | Price: $326.53
Total Value: $1,664,323.41
Shares Owned After: 149,836 | Ownership: I (Indirect) | Nature: By Family Partnership
Footnotes:
[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.
[Transaction #3]
Security: Class A Ordinary Stock
Date: 2026-09-02 | Code: P (Open market purchase)
Shares: +7,212 | Price: $327.52
Total Value: $2,362,074.24
Shares Owned After: 157,048 | Ownership: I (Indirect) | Nature: By Family Partnership
Footnotes:
[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.
[Transaction #4]
Security: Class A Ordinary Stock
Date: 2026-09-02 | Code: P (Open market purchase)
Shares: +4,145 | Price: $328.34
Total Value: $1,360,969.30
Shares Owned After: 161,193 | Ownership: I (Indirect) | Nature: By Family Partnership
Footnotes:
[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.
[Transaction #5]
Security: Class A Ordinary Stock
Date: 2026-09-02 | Code: P (Open market purchase)
Shares: +1,440 | Price: $329.69
Total Value: $474,753.60
Shares Owned After: 162,633 | Ownership: I (Indirect) | Nature: By Family Partnership
Footnotes:
[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.
[Transaction #6]
Security: Class A Ordinary Stock
Date: 2026-09-02 | Code: P (Open market purchase)
Shares: +367 | Price: $330.51
Total Value: $121,297.17
Shares Owned After: 163,000 | Ownership: I (Indirect) | Nature: By Family Partnership
Footnotes:
[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.
--- Holdings ---
[Holding #1]
Security: Class A Ordinary Stock
Ownership: D (Direct)
[Holding #2]
Security: Class A Ordinary Stock
Ownership: I (Indirect)
[Holding #3]
Security: Class A Ordinary Stock
Ownership: I (Indirect)
--- Footnotes (Complete Index) ---
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.
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.
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.
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.
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.
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.
--- Signature ---
/s/ /s/ Colby Alexis - Colby Alexis pursuant to a power of attorney from Lester Knight (2026-09-03)
