SEC CENTRAL INDEX KEY

Aon plc CIK Number

The SEC Central Index Key (CIK) for Aon plc (AON).

CIK (CENTRAL INDEX KEY)
0000315293
Also written as 315293 (without leading zeros).
Company
Aon plc
Ticker
AON
Download AON filings (PDF) →View on SEC EDGAR

What is a CIK number?

A CIK (Central Index Key) is the unique, permanent identifier the U.S. Securities and Exchange Commission assigns to every filer — companies, funds, and individuals — in its EDGAR system. Unlike a stock ticker, a CIK never changes: even if Aon plc changed its ticker or name, its CIK (0000315293) would stay the same.

That stability is why the CIK is the most reliable way to pull a company's filings programmatically. Every 10-K, 10-Q, 8-K, and Form 4 for Aon plc is indexed under CIK 0000315293.

CIK vs ticker — what is the difference?

  • Ticker (AON) — exchange trading symbol; can change or be reused.
  • CIK (0000315293) — SEC filer ID; permanent, one per filer, used across all EDGAR filings.
  • Leading zeros are optional: 0000315293 and 315293 refer to the same filer.

How to use Aon plc's CIK

Paste CIK 0000315293 into EDGAR full-text search to see every filing, or skip the friction and download AON filings as clean PDFs here. To look up any other company's CIK, use the CIK lookup directory.

Source: SEC EDGAR company index (sec.gov). CIK data is public.