Aon plc (AON)Sen. Alan Armstrong disclosed a purchase $1K–$15K

$1,001–$15,000

Reported range · official band, not an exact amount

116 days

Disclosure lag

Traded

Mar 27, 2026

Disclosed

Jul 21, 2026

The story around this disclosure

Every dated public record OQRO holds about the company from 60 days before to 120 days after, oldest first. It shows what was going on; none of it is a stated reason for the trade.

1. Jan 30, 2026Company filing · Form 8-K · ResultsReported its results
2. Feb 10, 2026Insider · First insider buy since Aug 2024Director purchased ~$1.28M of AON shares in the open market
3. Feb 17, 2026InsiderOfficer sold ~$1.64M of AON shares in the open market
4. Feb 26, 2026InsiderOfficer sold ~$1.42M of AON shares in the open market
5. Mar 26, 20265% stakeThe Vanguard Group reported a passive stake (13G)
6. Mar 27, 2026 · this disclosureCongressDisclosed purchase of AON — reported range $1,001 - $15,000

What came next

1. Apr 29, 20265% stakeVanguard Capital Management reported a passive stake (13G) of 7.3%
2. May 1, 2026Company filing · Form 8-K · ResultsReported its results
3. Jun 26, 2026Company filing · Form 8-K · Executive change, Shareholder voteChanged a top executive or board member, and held a shareholder vote (and 1 more item)“On June 26, 2026, Aon Corporation (“Aon Corporation”), an indirect, wholly owned subsidiary of Aon plc (“Aon” or the “Company”), and Gregory C. Case entered into an amendment (the “Case Amendment”) to the international assignment letter agreement dated July 1, 2016 between Aon Corporation and Mr. Case (as amended, the “Case International Assignment Letter”).”
4. Jul 7, 2026InsiderOfficer sold ~$216K of AON shares in the open market
5. Jul 16, 20265% stakeJPMORGAN CHASE & CO reported a passive stake (13G) of 5.6%
6. Jul 17, 2026Insider · 1 personInsiders: 3 sales (~$726K)

How to read Senate eFD periodic transaction report

The STOCK Act is a 2012 US law that requires members of Congress, and some senior staff, to publicly report their stock trades, and those of their spouse and dependent children, within 45 days.

Full guide: What is the STOCK Act?

What else is on file for Aon plc

For Aon plc, OQRO holds 12 insider filings (SEC Form 4 or Form 144), 1 Congress trade report and 35 fund holdings reports (13F) dated in the last 90 days.

These are records OQRO holds, counted by their date, not a measure of how much trading took place. Routine paperwork such as option exercises and tax withholding is left out. Everything for the company is on its AON page.

Other recent filings by Sen. Alan Armstrong

• Senate eFD periodic transaction report at Williams Companies (WMB)Sep 17, 2026
• Senate eFD periodic transaction report at Williams Companies (WMB)Sep 17, 2026
• Senate eFD periodic transaction report at KKR & Co. (KKR)Jul 21, 2026
• Senate eFD periodic transaction report at Globe Life (GL)Jul 21, 2026
• Senate eFD periodic transaction report at Copart (CPRT)Jul 21, 2026

The full history of Sen. Alan Armstrong is on the profile page.

How this filing works

• The STOCK Act

Other disclosures at Aon plc

• SEC Form 4Sep 4, 2026
• SEC Form 4Sep 4, 2026
• SEC Form 4Sep 4, 2026
• SEC Form 4Sep 4, 2026
• SEC Form 4Sep 4, 2026
• SEC Form 4Sep 4, 2026

Everything OQRO holds on this company is on its AON page.