Filings Radar

SEC 8-K and 6-K filings classified by Claude with reasoning, plus Form 4 insider transactions. Ingested from EDGAR’s filing stream in near-real time, reconciled overnight.

Aon plc (AON)

CIK 0000315293 6 material events

Insider activity (SEC Form 4)

Open-market buys and sells only — the deliberate trades. Zero here doesn’t mean no filings: grants, option exercises and tax withholding (below) are compensation, not market trades.

Open-market · last 30 days: 1 buyer bought $6.5M 0 sellers sold $0
Open-market · last 90 days: 1 buyer bought $6.5M 1 seller sold $1.7M
InsiderRoleDateTransactionSharesValue
KNIGHT LESTER B Director 2026-09-02 Open-market buy 1739 $566K
KNIGHT LESTER B Director 2026-09-02 Open-market buy 5097 $1.7M
KNIGHT LESTER B Director 2026-09-02 Open-market buy 7212 $2.4M
KNIGHT LESTER B Director 2026-09-02 Open-market buy 4145 $1.4M
KNIGHT LESTER B Director 2026-09-02 Open-market buy 1440 $475K
KNIGHT LESTER B Director 2026-09-02 Open-market buy 367 $121K
Zeidel Darren General Counsel 2026-07-28 Open-market sell 10b5-1 700 $263K
Zeidel Darren General Counsel 2026-07-28 Open-market sell 10b5-1 725 $274K
Zeidel Darren General Counsel 2026-07-28 Open-market sell 10b5-1 475 $180K
Zeidel Darren General Counsel 2026-07-17 Open-market sell 10b5-1 625 $231K
Zeidel Darren General Counsel 2026-07-17 Open-market sell 10b5-1 650 $242K
Zeidel Darren General Counsel 2026-07-17 Open-market sell 10b5-1 675 $252K
Zeidel Darren General Counsel 2026-07-07 Open-market sell 10b5-1 600 $216K
Reese Edmund Chief Financial Officer 2026-07-01 Option exercise 3975
Reese Edmund Chief Financial Officer 2026-07-01 Tax withholding 2198 $755K
Alvarez Jose Antonio Director 2026-06-25 Grant/award 776
Alvarez Jose Antonio Director 2026-06-25 Tax withholding 372 $118K
CAMPBELL JEFFREY C Director 2026-06-25 Grant/award 776
CAMPBELL JEFFREY C Director 2026-06-25 Tax withholding 186 $59K
Cai Jin-Yong Director 2026-06-25 Grant/award 776
Most recent 20 reported transactions. Open-market buys (P) and sells (S) are the deliberate ones; grants and option exercises are compensation. Not investment advice.

Risk Radar (year-over-year Risk Factors)

← All Risk Radar

Fiscal period ending 2025-12-31 versus 2024-12-31view filing on EDGAR →

Regulatory risk is the dominant mover: escalating Pillar Two retroactive tax exposure and a materially broadened data/AI compliance perimeter offset meaningful progress on M&A integration and balance-sheet deleveraging. The NFP integration overhang is effectively cleared and gross debt is down ~$1.8B, but new covenant compliance language tempers the leverage improvement. On balance, the regulatory deterioration outweighs the operational and financial easing.

0 company-specific · 2 eased/removed · 2 common-mode

Eased / removed

Removed

Removal of NFP integration risk disclosure indicates integration substantially complete or concluded. Material easing of previously disclosed M&A execution and cost realization risk.

We have incurred and may continue to incur significant integration-related costs in connection with the acquisition of NFP. Aon has incurred and expects to continue to incur a number of non-recurring…

Revised

Debt reduced from $17.0B to $15.2B (10.6% decrease), easing leverage risk. However, new covenant compliance language added, slightly offsetting the improvement.

We have debt outstanding that could adversely affect our financial flexibility. As of December 31, 2025, we had total consolidated debt outstanding of approxim ately $15.2 billion. T he level of debt…

Also disclosed — common-mode (Global tax reform pillar two, AI regulatory compliance)
Global tax reform pillar two Revised

Removal of Inflation Reduction Act excise tax reference and addition of prior-year Pillar Two exposure escalates tax uncertainty and retroactive liability risk.

Our tax assets and liabilities are subject to a variety of different factors, which could create volatility in our global effective tax rate, expose us to greater than anticipated tax liabilities or…

AI regulatory compliance Revised

Scope expanded from data privacy/cybersecurity to explicitly include data management, data localization, and AI regulation. Title broadened to emphasize business opportunity impact.

Regulation in the areas of data privacy, data protection, data management, data transfer, data localization, artificial intelligence, and cybersecurity could increase our costs and affect or limit…

Material year-over-year changes to this company's Risk Factors (Item 1A), found by comparing each annual report to the prior year, judged for materiality, and classified as company-specific or common-mode against the cross-company catalog. Common-mode changes are the macro themes many companies disclose in common; they are collapsed above. A filing marked unchanged had no material change from the prior year; its summary describes the company's standing risks, which remain in force. Fiscal periods are the reporting period ends. Not investment advice.

M&A activity

8-K filed 2026-09-11 confidence 95% Item 8.01

This Item 8.01 disclosure concerns the merger of Aon's subsidiary (Merger Sub) with USI Advantage, with USI Advantage surviving as a direct, wholly-owned subsidiary of Aon North America. The filing provides audited and unaudited financial statements of USI and pro forma combined financial statements reflecting the merger. This is a material acquisition activity under Item 1.01/2.01 framework, disclosed here with supporting financial exhibits required for SEC compliance in connection with the merger transaction.

View raw filing on EDGAR →

M&A activity

8-K filed 2026-08-31 confidence 99% Item 1.01

Aon plc entered into a definitive Agreement and Plan of Merger on August 30, 2026, to acquire USI Advantage Corp. for $17 billion in cash, establishing a premier U.S. middle-market platform with expected annual synergies of $395 million and accretion to adjusted EPS in 2028, subject to regulatory approvals and expected to close in Q4 2026.

View raw filing on EDGAR →

Exec appointment

8-K filed 2026-08-17 confidence 75% Item 5.02

The disclosure centers on Nadin Virani's appointment as interim Chief Financial Officer effective August 17, 2026, a material executive role. While Edmund Reese's transition from CFO is also disclosed, the principal action emphasized is Virani's appointment to fill the CFO position, supported by details of his background, compensation adjustment ($50,000/month increase), and bonus eligibility. This is a material change in senior leadership affecting investor assessment of the company's financial management.

View raw filing on EDGAR →

Earnings release

8-K filed 2026-07-29 confidence 99% Item 2.02

Aon plc issued a press release on July 29, 2026 announcing its second-quarter 2026 results of operations for the period ended June 30, 2026. The disclosure includes comprehensive financial metrics (revenue, operating income, EPS, cash flow), segment performance, and forward guidance. This is a standard quarterly earnings release filed under Item 2.02, which is material to investors assessing the company's financial performance and operational execution.

View raw filing on EDGAR →

Shareholder vote

8-K filed 2026-07-01 confidence 95% Item 5.07

Aon held its Annual Meeting of Shareholders on June 26, 2026, with voting results on seven proposals including election of 13 directors (approved), an advisory vote on executive compensation (not approved), ratification of auditors, and authorizations for share issuance and pre-emption rights.

View raw filing on EDGAR →

Dividend Distribution

8-K filed 2026-07-01 confidence 92% Item 8.01

The Board approved an increase to Aon's share repurchase program by $7.5 billion, bringing total authorization to approximately $8.3 billion, representing a material capital return to shareholders.

View raw filing on EDGAR →