What SEC filings does Aon plc submit to the SEC?

Aon plc (AON) submits several types of SEC filings including Form 4 (insider transactions), Form 144 (proposed insider sales), 8-K reports (material events such as earnings releases, acquisitions, leadership changes), and periodic reports — the 10-Q (quarterly) and 10-K (annual). All filings are publicly available through SEC EDGAR.

What does a Form 4 filing tell me about AON?

A Form 4 for AON discloses a transaction by a company insider — typically a director, officer, or 10%+ shareholder. It shows the source-reported date, number of shares, price, and updated ownership. These facts do not establish motive or predict future returns.

How do I interpret an 8-K filing from Aon plc?

An 8-K signals a material event requiring prompt disclosure. Common triggers include earnings pre-announcements, acquisitions, leadership appointments or departures, credit changes, or regulatory actions. Read the item codes inside the filing to understand exactly what was disclosed before drawing conclusions.

What is the difference between a 10-K and 10-Q for AON?

The 10-K is Aon plc's annual report with fully audited financial statements, comprehensive MD&A, and complete risk factor disclosures — filed 60–90 days after fiscal year-end. The 10-Q is a lighter quarterly report with unaudited financials filed for the first three quarters. Together they provide a continuous financial picture of the company.

Where can I see all AON SEC filings directly on EDGAR?

You can view all historical Aon plc filings on the SEC EDGAR company page for AON. Each filing card on this page links directly to the original SEC document.

How often does Aon plc file with the SEC?

Aon plc files one 10-K per year and up to three 10-Qs per year. Form 4 insider transactions must be reported within two business days of each trade, so the frequency depends on how often insiders are buying or selling AON shares. 8-K filings occur whenever a material event happens — which can be several times per quarter for an active company.

AON SEC Filing News — Aon plc

Latest SEC filings for Aon plc (AON) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-09-22.

Aon plc operates as a professional services firm in the United States, rest of the Americas, the United Kingdom, Ireland, rest of Europe, the Middle East, Africa, and the Asia Pacific. It operates through Risk Capital and Human Capital segments. The company offers commercial risk solutions comprising retail and insurance brokerage, specialty solutions, global risk consulting, captives management, and affinity programs; health solutions, such as consulting and brokerage, consumer benefits, and ta…

Sector: Financial Services Industry: Insurance Brokers Market Cap: $61.3B

Total Filings

Bullish Classifications

Bearish Classifications

Insider Transactions

Material Events (8-K)

Periodic Reports

Rule-based classifications for AON currently lean bearish. Of the 20 filing records displayed, 3 carry bearish classifications (such as insider sales or negative 8-K disclosures) versus 1 bullish. This does not necessarily signal fundamental deterioration — insiders sell for many reasons — but it is worth monitoring alongside the company's core financial metrics.

AON Filing Activity Snapshot 2026-06-29 — 2026-09-22

Insider Transactions (Form 4)

1 buy vs 3 sells

Net insider selling in this period — insiders sell for many reasons beyond conviction.

Largest Form 144 Filing

$6.55M

KNIGHT LESTER B (Director) · 2026-09-03

20,000 shares · Form 4

Form 144 Notices

Proposed insider sales filed — Form 144 is a notice of intent, not a confirmed transaction. Actual sales are confirmed via Form 4.

Insider Transactions 9 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 9 filings in this group are Form 4s for Aon plc.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 9 insider filings shown, the breakdown is 4 compensation award, 3 open-market sale, 1 option exercise and 1 open-market purchase. 4 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Compensation award ×4: Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.
Open-market sale ×3: The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Option exercise ×1: The insider converted options into shares. The exercise price was fixed when the options were granted, so the timing usually tracks an expiry schedule.
Open-market purchase ×1: The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Form 4 Open-market purchase Insider Buying 2026-09-03

AON insider KNIGHT LESTER B (Director) bought 20,000 shares (~$6.55M)

KNIGHT LESTER B, listed as Director at Aon plc, reported an open-market purchase of 20,000 AON shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`P`	Open-market purchase	1,739	$325.63	$566.3K
`P`	Open-market purchase	5,097	$326.53	$1.66M
`P`	Open-market purchase	7,212	$327.52	$2.36M
`P`	Open-market purchase	4,145	$328.34	$1.36M
`P`	Open-market purchase	1,440	$329.69	$474.8K
`P`	Open-market purchase	367	$330.51	$121.3K

Filing: Form 4 (Insider Transaction) Insider: KNIGHT LESTER B (Director) Shares: 20,000 Est. Value: $6.55M

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-07-30

AON insider Zeidel Darren (General Counsel) sold 1,900 shares (~$717.8K)

Zeidel Darren, listed as General Counsel at Aon plc, reported an open-market sale of 1,900 AON shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`S`	Open-market sale	700	$376.00	$263.2K
`S`	Open-market sale	725	$378.00	$274.1K
`S`	Open-market sale	475	$380.00	$180.5K

Filing: Form 4 (Insider Transaction) Insider: Zeidel Darren (General Counsel) Shares: 1,900 Est. Value: $717.8K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-07-21

AON insider Zeidel Darren (General Counsel) sold 1,950 shares (~$725.5K)

Zeidel Darren, listed as General Counsel at Aon plc, reported an open-market sale of 1,950 AON shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`S`	Open-market sale	625	$370.00	$231.2K
`S`	Open-market sale	650	$372.00	$241.8K
`S`	Open-market sale	675	$374.00	$252.4K

Filing: Form 4 (Insider Transaction) Insider: Zeidel Darren (General Counsel) Shares: 1,950 Est. Value: $725.5K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-07-09

AON insider Zeidel Darren (General Counsel) sold 600 shares (~$216.0K)

Zeidel Darren, listed as General Counsel at Aon plc, reported an open-market sale of 600 AON shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`S`	Open-market sale	600	$360.00	$216.0K

Filing: Form 4 (Insider Transaction) Insider: Zeidel Darren (General Counsel) Shares: 600 Est. Value: $216.0K

View on SEC EDGAR → Open Filing Document →

Form 4 Option exercise Tax / Compensation Filing 2026-07-06

AON insider Form 4 filed for equity award, exercise, or tax withholding

Reese Edmund (Chief Financial Officer) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

The insider converted options into shares. The exercise price was fixed when the options were granted, so the timing usually tracks an expiry schedule.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`M`	Option exercise	3,975	—	—
`F`	Tax withholding on vested shares	2,198	$343.56	$755.1K
`M`	Option exercise derivative · Restricted Share Unit (Right to Receive)	3,975	—	—

Filing: Form 4 (Insider Transaction) Insider: Reese Edmund (Chief Financial Officer) Shares: 6,173

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-06-29

AON insider Form 4 filed for equity award, exercise, or tax withholding

KNIGHT LESTER B (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	1,488	—	—

Filing: Form 4 (Insider Transaction) Insider: KNIGHT LESTER B (Director) Shares: 1,488

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-06-29

AON insider Form 4 filed for equity award, exercise, or tax withholding

Alvarez Jose Antonio (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	776	—	—
`F`	Tax withholding on vested shares	372	$315.95	$117.5K

Filing: Form 4 (Insider Transaction) Insider: Alvarez Jose Antonio (Director) Shares: 1,148

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-06-29

AON insider Form 4 filed for equity award, exercise, or tax withholding

FRANCIS CHERYL A (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	776	—	—
`F`	Tax withholding on vested shares	186	$315.95	$58.8K

Filing: Form 4 (Insider Transaction) Insider: FRANCIS CHERYL A (Director) Shares: 962

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-06-29

AON insider Form 4 filed for equity award, exercise, or tax withholding

STAVRIDIS JAMES G. (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	776	—	—
`F`	Tax withholding on vested shares	186	$315.95	$58.8K

Filing: Form 4 (Insider Transaction) Insider: STAVRIDIS JAMES G. (Director) Shares: 962

View on SEC EDGAR → Open Filing Document →

Proposed Insider Sales 3 · Form 144

A Form 144 is a notice of intent to sell restricted or control securities. It is not a record that anything was sold. Aon plc has 3 such notices in this period.

The distinction matters because a Form 144 is frequently reported as though it were a completed insider sale. The filer may sell all of the shares covered, some of them, or none at all, and there is no obligation to update the notice either way. A sale that is actually executed by an officer or director shows up separately on a Form 4, which is the filing to check before treating a proposed sale as a real one.

Form 144 Proposed Insider Sale 2026-07-28

AON Form 144 filed for proposed insider sale by Zeidel Darren (1,900 shares) ~$717.8K

Zeidel Darren filed a Form 144 with the SEC indicating intent to sell AON (Aon plc) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Zeidel Darren Shares: 1,900 Est. Value: $717.8K

View on SEC EDGAR → Open Filing Document →

Form 144 Proposed Insider Sale 2026-07-17

AON Form 144 filed for proposed insider sale by Zeidel Darren (1,950 shares) ~$725.5K

Filing: Form 144 (Proposed Sale Notice) Insider: Zeidel Darren Shares: 1,950 Est. Value: $725.5K

View on SEC EDGAR → Open Filing Document →

Form 144 Proposed Insider Sale 2026-07-07

AON Form 144 filed for proposed insider sale by Zeidel Darren (600 shares) ~$216.0K

Filing: Form 144 (Proposed Sale Notice) Insider: Zeidel Darren Shares: 600 Est. Value: $216.0K

View on SEC EDGAR → Open Filing Document →

Material Events 7 · Form 8-K

An 8-K reports a material event in the window between scheduled reports. There are 7 in this period for Aon plc. Each 8-K names the item number it is filed under, and that number is the fastest way to tell a routine disclosure from a consequential one.

Item 2.02 is an earnings release, Item 5.02 is a change of directors or officers, and Item 1.01 or 2.01 covers a material agreement or a completed acquisition. Item 7.01 and Item 8.01 are the general-purpose disclosure items and carry no fixed meaning on their own.

Form 8-K Material Company Update 2026-09-22