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AON

Aon plc Class A

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AON in the last 90 days

Aon plc Class A (AON) had no congress transactions and 6 insider purchases worth $6,549,688 by 1 insider in filings from the last 90 days.

FINRA’s latest report (settlement 15 SEPT 2026) shows 3,695,919 shares held short, 1.8 days to cover, down 2.2% from the report before.

  • Insiders: open-market purchases only (Form 4 code P); a purchase filed by related owners counts once.
  • Delay: each filing below shows how many days passed between the trade and its publication. None of this is real-time.

Latest filing on file: 03 SEPT 2026 · FINRA settlement 15 SEPT 2026 · public filings, reported as filed

What the price is doing

$276$326 → $276 · -15% over six months

AON is down 15%. Short sellers still aren't backing off.

Bets against it — they pay off if the price falls — are up 53% over the same stretch.

$326 STARTAPRMAYJUNJULAUGSEPTOCT02 SEPT 2026 — KNIGHT LESTER B — $121,29702 SEPT 2026 — KNIGHT LESTER B — $474,75402 SEPT 2026 — KNIGHT LESTER B — $566,27102 SEPT 2026 — KNIGHT LESTER B — $1,360,96902 SEPT 2026 — KNIGHT LESTER B — $1,664,32302 SEPT 2026 — KNIGHT LESTER B — $2,362,074NOW $276

Insider activityBoughtSold

Short sellers

11 reports · twice a month

APR 0%peak +103%15 SEPT +53%APRMAYJUNJULAUGSEPTOCT

Money betting AON falls. Reported twice a month, and it shows up seven working days late.

Politicians

None filed

Traded over six months

View activity →

Short sellers

Bets up 53%

Over six months · newest 15 SEPT 2026

See the numbers →

Insiders

6 reported

Traded over six months

See the filings →

Quiet Money

Our take on how well AON holds up when sellers show up.

How it holds up · last 60 trading days

Through 21 SEPT 2026

Vulnerable

When AON gets hit, it tends to drop more easily than usual.

Lately, AON has been easier to push down than usual.

That's been true for the last 30 trading days.

The last 6 months

ResilientMixedVulnerable
MAYJUNJULAUGSEPT
31 MAR 2026Now · 21 SEPT 2026

What the filings show

What the filings show · last 90 days

2 of 4 sources

+47Tilted in

Leaning outBalancedLeaning in

The disclosed money is leaning into this name, on what has actually been filed. This reads on two of the four sources we track.

Short interest
Short interest fell 18.9% — 4,554,648 to 3,695,919 shares between 15 JUL 2026 and 15 SEPT 2026. See the filings →
+47
Insider purchases
1 insider disclosed buying $6,549,688 across 1 filing.
+46

This summarises filings that have already been published — it is not a forecast, a rating of the company, or advice. Every figure above is listed in full further down this page, with the document it came from.

FINRA short interest

Settlement 15 SEPT 2026 · shares held short

3,695,919shares held short

Days to cover

1.75

Avg daily volume

2,110,475

Since last report

-2.24%

As of 15 September 2026, 3,695,919 Aon plc Class A shares were held short — the total across every reporting firm, not one fund's position. That is 84,532 shares fewer than the previous report, a 2.24% decrease. At the average daily volume of 2,110,475 shares, that position represents 1.75 days of trading — what the filing calls days to cover.

This is the most recent figure that exists, and it is 17 days old. FINRA collects short interest twice a month, on a settlement date, and publishes it about eight business days later. So nobody has a live short-interest number for AON — not us, and not anyone quoting one. We print the settlement date on the figure so you always know which day you are looking at.

Across the 12 reports we hold, the position has risen from 2,485,940 shares on 31 March 2026 to 3,695,919 today, a change of 48.7%. The highest reading in that window was 4,919,769 shares on 31 July 2026.

SettlementShares shortDays to cover
15 SEPT 20263,695,9191.75
31 AUG 20263,780,4514.44
14 AUG 20263,368,6293.60
31 JUL 20264,919,7693.05
15 JUL 20264,554,6484.04
30 JUN 20263,695,8561.61
15 JUN 20263,590,6302.41
29 MAY 20262,993,0701.97
15 MAY 20262,857,0231.83
30 APR 20262,372,2051.89
15 APR 20262,422,5071.80
31 MAR 20262,485,9401.87
What is AON's short interest?
3,695,919 shares, as of the 15 September 2026 settlement date. That is the figure FINRA published, unadjusted.
What percentage of the float is short?
We do not publish that, because FINRA does not publish float. The regulator reports the number of shares held short; turning it into a percentage needs a share count from somewhere else, and different sources disagree about what counts as float. We would rather give you the number that was actually filed than a percentage built on an assumption.
How current is this?
It is 17 days old, and that is as fresh as short interest gets. FINRA measures it twice a month and publishes it seven business days after the settlement date. Any site showing you a "live" short interest figure is showing you something else.
What does days to cover mean?
It is the short position divided by average daily trading volume — here, 1.75. It describes how many days of ordinary trading the position is equivalent to. It is arithmetic from the filing, not a prediction about what will happen.
Where does this come from?
FINRA's consolidated short interest file, which is public. We read it directly and store it unchanged, except that we blank the days-to-cover placeholder FINRA writes when a stock has almost no volume.

Disclosed insider buying on file

$6,549,688across 6 purchases

Open-market purchases only — the amount is a fact, not a verdict.

On file here

Short positions0

Insider purchases6

Congress transactions2

Latest change03 SEPT 2026

SHORT POSITIONS · 0INSIDER BUYS · 6CONGRESS · 2

Insider purchases on file

  • SEC — Form 4 insider purchase

    KNIGHT LESTER BDirector

    BOUGHTClass A Ordinary Stock

    $2,362,074

    7,212 sh @ $327.52

    02 SEPT 2026 → filed 03 SEPT 2026

    Filed 1 day after the tradeSEC EDGAR · 0001193125-26-382419 →

  • SEC — Form 4 insider purchase

    KNIGHT LESTER BDirector

    BOUGHTClass A Ordinary Stock

    $1,360,969

    4,145 sh @ $328.34

    02 SEPT 2026 → filed 03 SEPT 2026

    Filed 1 day after the tradeSEC EDGAR · 0001193125-26-382419 →

  • SEC — Form 4 insider purchase

    KNIGHT LESTER BDirector

    BOUGHTClass A Ordinary Stock

    $474,754

    1,440 sh @ $329.69

    02 SEPT 2026 → filed 03 SEPT 2026

    Filed 1 day after the tradeSEC EDGAR · 0001193125-26-382419 →

  • SEC — Form 4 insider purchase

    KNIGHT LESTER BDirector

    BOUGHTClass A Ordinary Stock

    $121,297

    367 sh @ $330.51

    02 SEPT 2026 → filed 03 SEPT 2026

    Filed 1 day after the tradeSEC EDGAR · 0001193125-26-382419 →

  • SEC — Form 4 insider purchase

    KNIGHT LESTER BDirector

    BOUGHTClass A Ordinary Stock

    $566,271

    1,739 sh @ $325.63

    02 SEPT 2026 → filed 03 SEPT 2026

    Filed 1 day after the tradeSEC EDGAR · 0001193125-26-382419 →

  • SEC — Form 4 insider purchase

    KNIGHT LESTER BDirector

    BOUGHTClass A Ordinary Stock

    $1,664,323

    5,097 sh @ $326.53

    02 SEPT 2026 → filed 03 SEPT 2026

    Filed 1 day after the tradeSEC EDGAR · 0001193125-26-382419 →

Congress transactions on file

2 disclosed · newest first · every row links to its filing

WhoAmount as filedTradedFiledLag
Hon. Jefferson ShreveSOLD$15,001 – $50,00008 MAY 202522 JUN 202545 days
Hon. Thomas H. Kean JrBOUGHT$1,001 – $15,00027 MAY 202517 JUN 202521 days
What this page will never showNo price targetsNo score out of 100No buy or sell callsNo predictionsDocuments, dates, and how late they were.