Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

Aon plc

AON · NYSE · CIK 0000315293 · Financial Services · Insurance Brokers

INSIDER SIGNAL

60.8 / 100

1 buyers · 6 purchase transaction lines · $6.5M gross purchase

WHY THIS SIGNAL?

Buyer breadthLow
Purchase sizeStrong
RoleStrong
RecencyModerate
ConvictionModerate
Score anatomy

Each bar shows the contribution to the current score; the weights and formula stay unchanged.

Cluster+7.0 / 35
Purchase size+21.7 / 25
Role+20.0 / 20
Recency+4.7 / 10
Conviction+7.5 / 10

What is holding the score back?

  • ⚠ Cluster breadth is moderate · 1 insider(s), not 4+
  • ✓ Role scores high · most senior buyer: Director

Purchase-size comments are relative to the model scale. Average daily volume is a separate market-context diagnostic.

US-v1.2 ranks qualifying equity purchases under the current 180-day rules. The score is a research priority, not a return forecast or probability. Backtests have not shown that a higher US score is followed by better returns.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
NOTEBAERT RICHARD CDirector
○○○
Zeidel DarrenGeneral Counsel
▼▼▼
STAVRIDIS JAMES G.Director
○○
SANTONA GLORIADirector
○○
KNIGHT LESTER BDirector
○●
FRANCIS CHERYL ADirector
○○
● Purchase▼ Sale○ Other

Showing the six most active owners; 8 additional owner(s) remain in Form 4 evidence.

Purchase breadth & concentration

QUALIFYING BUYERS1
PURCHASE CONCENTRATION100%Largest buyer: KNIGHT LESTER B · $6.5M
CLUSTER BUYING · 15D1 insiderPeak activity: 2026-09-02–2026-09-02

Roles in the peak window: Director. Concentration uses priced qualifying P lines only and does not change the saved score.

SIGNAL HISTORY

60.8 / 100

Latest recorded score

↓ -0.2 ptsversus the previous recorded snapshot
  1. 61.2
  2. 61.2
  3. 61.1
  4. 61.0
  5. 60.8

Only scores saved when a full US scoring run completed are shown; gaps are not reconstructed.

Recent Form 4 activity

7Purchases
11Sales
82Other Form 4 lines
42SEC filings · 365 days
BUYING6 qualifying P line(s) · 180 days
SELLING7 sale line(s) · context only
OTHER26 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context provides additional background on recent price performance and risk. It does not affect the Insider Signal.

Price performance

1M
-11.1%
3M
-25.6%
6M
-12.5%
12M
-25.2%

Volatility & liquidity

Volatility
25.0%
Beta
—
Avg daily value
USD 432.9M

Valuation

Market cap
—
P/E
—

Fundamentals

Profit margin
21.5%
ROE
39.5%
Industry
Insurance Brokers

Market data

Price data up to: 2026-10-11 · Price source: OpenBB/yfinance; volume from price cache (yfinance) · From SEC filings: Profit margin, ROE · Fiscal year ended: 2025-12-31 · Status: PASS

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
4,223,243
Previous report
3,695,919
Avg daily volume
2,402,502
Days to cover
1.8

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-02KNIGHT LESTER BPurchase (P)Class A Ordinary Stock20,000USD 327.48USD 6,549,688SEC filing ↗
2026-02-10KNIGHT LESTER BPurchase (P)Class A Ordinary Stock4,000USD 319.24USD 1,276,960SEC filing ↗
2024-08-28Spruell ByronPurchase (P)Class A Ordinary Stock725USD 340.08USD 246,558SEC filing ↗
2024-05-03KNIGHT LESTER BPurchase (P)Class A Ordinary Stock5,000USD 276.61USD 1,383,058SEC filing ↗
2024-02-07KNIGHT LESTER BPurchase (P)Class A Ordinary Stock25,000USD 301.97USD 7,549,250SEC filing ↗
2023-08-23Spruell ByronPurchase (P)Class A Ordinary Stock800USD 324.58USD 259,664SEC filing ↗
2022-08-23Spruell ByronPurchase (P)Class A Ordinary Stock400USD 291.72USD 116,688SEC filing ↗
2022-05-05KNIGHT LESTER BPurchase (P)Class A Ordinary Stock14,000USD 286.58USD 4,012,120SEC filing ↗
2021-11-23Spruell ByronPurchase (P)Class A Ordinary Stock200USD 296.32USD 59,264SEC filing ↗
2021-08-04KNIGHT LESTER BPurchase (P)Class A Ordinary Stock10,000USD 263.96USD 2,639,572SEC filing ↗
2020-11-06BRUNO JOHN GPurchase (P)Class A Ordinary Stock1,000USD 186.46USD 186,460SEC filing ↗
2020-11-05KNIGHT LESTER BPurchase (P)Class A Ordinary Stock10,000USD 186.55USD 1,865,526SEC filing ↗
2020-05-13KNIGHT LESTER BPurchase (P)Class A Ordinary Stock70,000USD 195.00USD 13,650,000SEC filing ↗

Form 4 evidence

100 transaction lines in the latest 365-day window; 761 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-02KNIGHT LESTER BPurchase (P)Class A Ordinary Stock20,000USD 327.48USD 6,549,688SEC filing ↗
2026-07-28Zeidel DarrenSale (S)Class A Ordinary Stock1,900USD 377.76USD 717,750SEC filing ↗
2026-07-17Zeidel DarrenSale (S)Class A Ordinary Stock1,950USD 372.05USD 725,500SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-02KNIGHT LESTER BPurchase (P)Class A Ordinary Stock20,000USD 327.48USD 6,549,688SEC filing ↗
2026-07-28Zeidel DarrenSale (S)Class A Ordinary Stock1,900USD 377.76USD 717,750SEC filing ↗
2026-07-17Zeidel DarrenSale (S)Class A Ordinary Stock1,950USD 372.05USD 725,500SEC filing ↗
2026-07-07Zeidel DarrenSale (S)Class A Ordinary Stock600USD 360.00USD 216,000SEC filing ↗
2026-07-01Reese EdmundOption exercise / conversion (M)Class A Ordinary Stock3,975USD —USD —SEC filing ↗
2026-07-01Reese EdmundTax withholding (F)Class A Ordinary Stock2,198USD 343.56USD 755,183SEC filing ↗
2026-06-25Spruell ByronTax withholding (F)Class A Ordinary Stock186USD 315.95USD 58,843SEC filing ↗
2026-06-25Spruell ByronAward / grant (A)Class A Ordinary Stock776USD —USD —SEC filing ↗
2026-06-25STAVRIDIS JAMES G.Tax withholding (F)Class A Ordinary Shares186USD 315.95USD 58,843SEC filing ↗
2026-06-25STAVRIDIS JAMES G.Award / grant (A)Class A Ordinary Shares776USD —USD —SEC filing ↗
2026-06-25SMITH SARAH GTax withholding (F)Class A Ordinary Stock186USD 315.95USD 58,843SEC filing ↗
2026-06-25SMITH SARAH GAward / grant (A)Class A Ordinary Stock776USD —USD —SEC filing ↗
2026-06-25SANTONA GLORIATax withholding (F)Class A Ordinary Stock186USD 315.95USD 58,843SEC filing ↗
2026-06-25SANTONA GLORIAAward / grant (A)Class A Ordinary Stock776USD —USD —SEC filing ↗
2026-06-25NOTEBAERT RICHARD CTax withholding (F)Class A Ordinary Stock186USD 315.95USD 58,843SEC filing ↗
2026-06-25NOTEBAERT RICHARD CAward / grant (A)Class A Ordinary Stock776USD —USD —SEC filing ↗
2026-06-25Karaboutis AdrianaTax withholding (F)Class A Ordinary Stock186USD 315.95USD 58,843SEC filing ↗
2026-06-25Karaboutis AdrianaAward / grant (A)Class A Ordinary Stock776USD —USD —SEC filing ↗
2026-06-25KNIGHT LESTER BAward / grant (A)Class A Ordinary Stock1,488USD —USD —SEC filing ↗
2026-06-25Jenkins Jo AnnTax withholding (F)Class A Ordinary Stock186USD 315.95USD 58,843SEC filing ↗
2026-06-25Jenkins Jo AnnAward / grant (A)Class A Ordinary Stock776USD —USD —SEC filing ↗
2026-06-25FRANCIS CHERYL ATax withholding (F)Class A Ordinary Stock186USD 315.95USD 58,843SEC filing ↗
2026-06-25FRANCIS CHERYL AAward / grant (A)Class A Ordinary Stock776USD —USD —SEC filing ↗
2026-06-25Cai Jin-YongTax withholding (F)Class A Ordinary Stock397USD 315.95USD 125,280SEC filing ↗
2026-06-25Cai Jin-YongAward / grant (A)Class A Ordinary Stock776USD —USD —SEC filing ↗
2026-06-25CAMPBELL JEFFREY CTax withholding (F)Class A Ordinary Stock186USD 315.95USD 58,843SEC filing ↗
2026-06-25CAMPBELL JEFFREY CAward / grant (A)Class A Ordinary Stock776USD —USD —SEC filing ↗
2026-06-25Alvarez Jose AntonioTax withholding (F)Class A Ordinary Stock372USD 315.95USD 117,682SEC filing ↗
2026-06-25Alvarez Jose AntonioAward / grant (A)Class A Ordinary Stock776USD —USD —SEC filing ↗
2026-05-12NOTEBAERT RICHARD CGift (G)Class A Ordinary Stock1,438USD 0.00USD 0SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerAON
CIK0000315293
SectorFinancial Services
IndustryInsurance Brokers Yahoo Finance
SEC SIC6411 Insurance Agents, Brokers & Service
ExchangeNYSE

Data coverage

Local Form 4 history761 transaction lines from 2020-02-13 to 2026-09-02
26 P purchase lines · 72 S sale lines · 663 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.