Exhibit 22.1

Subsidiary Guarantors and Issuers of Guaranteed Securities

The table below sets forth the respective issuers, co-issuers, and guarantors of the notes issued by Aon Global Limited, Aon Global Holdings plc, Aon North America, Inc., and Aon Corporation and the jurisdiction of incorporation of each such entity.

Aon CorporationAon Global LimitedAon North America, Inc.Aon Corporation and
Aon Global Holdings plc		Aon North America, Inc. and
Aon Global Holdings plc
EntityJurisdiction of Incorporation

8.205% Junior Subordinated Notes due 2027
4.50% Senior Notes due 2028
3.75 Senior Notes due 2029
2.8% Senior Notes due 2030
6.25% Senior Notes due 2040



4.25% Senior Notes due 2042
4.45% Senior Notes due 2043
4.60% Senior Notes due 2044
4.75% Senior Notes due 2045		5.125% Senior Notes due 2027
5.150% Senior Notes due 2029
5.300% Senior Notes due 2031
5.450% Senior Notes due 2034
5.750% Senior Notes due 2054		2.85% Senior Notes due 2027
2.05% Senior Notes due 2031
2.60% Senior Notes due 2031
5.00% Senior Notes due 2032
5.35% Senior Notes due 2033
2.90% Senior Notes due 2051
3.90% Senior Notes due 2052		5.350% Senior Notes due 2029
5.625% Senior Notes due 2031
5.800% Senior Notes due 2033
5.950% Senior Notes due 2036
6.100% Senior Notes due 2038
6.450% Senior Notes due 2046
6.450% Senior Notes due 2056
Aon plcIrelandGuarantorGuarantorGuarantorGuarantorGuarantor
Aon Global LimitedUKGuarantorIssuerGuarantorGuarantorGuarantor
Aon Global Holdings plcUKGuarantorGuarantorGuarantorCo-IssuerCo-Issuer
Aon CorporationUSIssuerGuarantorGuarantorCo-IssuerGuarantor
Aon North America, Inc.USGuarantorGuarantorIssuerGuarantorCo-Issuer