What does CUSIP 037389103 represent in this 13F holders report?

CUSIP 037389103 is the security identifier for AON - AON PLC - COM used to aggregate holder disclosures.

How many institutions held AON - AON PLC - COM in Q1 2021?

4 institutional investors reported AON - AON PLC - COM for Q1 2021. Use the holders table for investor-level position and value details.

AON PLC - COM (AON)

CUSIP: 037389103

Q1 2021 13F Holders as of 31 Mar 2021

Security type / class: Equity / COM
Total 13F shares: 59,099
Total 13F value: $13,598,000
Share change: -5,330
SEC-reported price per share: $230.08
Number of holders: 4
Value change: -$1,226,323
Number of buys: 1
Number of sells: 1

Security key

037389103

Report period

Q1 2021

Institutions

Top holders

AON full security history Ownership snapshot Full 13F holder table Newer quarter: Q3 2025 Aon plc SEC filings Aon plc company facts

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

Reporting periods

Holder history for CUSIP 037389103

Newer quarter: Q3 2025

Recent filing periods:

Q2 2026 Q1 2026 Q4 2025 Q3 2025

Ownership snapshot

Top reported holders of AON - AON PLC - COM (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader

MASSACHUSETTS FINANCIAL S...

Disclosed value leader

MASSACHUSETTS FINANCIAL S...

Comparable rows

15/15

Latest evidence

31 Dec 2020

13F Lead comparable stake: 9.3% Showing 1-6 of 15 holder rows.

Quick read

MASSACHUSETTS FINANCIAL SERVICES CO /MA/ leads the comparable SEC ownership view at 9.3%.

15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens MASSACHUSETTS FINANCIAL SERVICES CO /MA/'s linked filing trail.

Comparable ownership Top 5

MASSACHUSETTS FINANCIAL SERVICES ... 9.3%

VANGUARD GROUP INC 8.1%

BlackRock Finance, Inc. 8%

Capital International Investors 4.6%

STATE STREET CORP 4.1%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-6 of 15 holder rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
MASSACHUSETTS FINANCIAL SERVICES CO /MA/	13F Company 13F	9.3%	$4,267,118,000 20,197,468 shares	—	31 Dec 2020
VANGUARD GROUP INC	13F Company 13F	8.1%	$3,717,343,000 17,595,225 shares	—	31 Dec 2020
BlackRock Finance, Inc.	13F Company 13F	8%	$3,656,520,000 17,307,328 shares	—	31 Dec 2020
Capital International Investors	13F Company 13F	4.6%	$2,123,044,000 10,055,114 shares	—	31 Dec 2020
STATE STREET CORP	13F Company 13F	4.1%	$1,885,676,000 8,925,432 shares	—	31 Dec 2020
EAGLE CAPITAL MANAGEMENT LLC	13F Company 13F	3.3%	$1,511,175,000 7,152,814 shares	—	31 Dec 2020

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

13F holder rows

Institutional holders as of Q1 2021

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions

59,099

Rows available

Investor	Option	Weight %	Change %	SEC-reported value	* Price	Shares	Share Change	Activity	Report Period

^* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.

Compare Q1 2021 vs Q1 2026 Across Filers

Q1 2026 holders

Q1 2021 holders

Holder diff

Investor	Q1 2026 Shares	Q1 2021 Shares	Share Diff	Share Chg %	Q1 2026 value	Q1 2021 value	Value change	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend