Holding(s) in Company

Holding(s) in Company

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi
1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached: ii	INFORMA PLC

2 Reason for the notification (please tick the appropriate box or boxes):
An acquisition or disposal of voting rights		Yes
An acquisition or disposal of qualifying financial instruments which may result in the acquisition of shares already issued to which voting rights are attached		No
An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments		No
An event changing the breakdown of voting rights		No
Other (please specify):

3. Full name of person(s) subject to the notification obligation: iii	FMR LLC
4. Full name of shareholder(s) (if different from 3.):iv	See below
5. Date of the transaction and date on which the threshold is crossed or reached: v	17 NOVEMBER 2010
6. Date on which issuer notified:	18 NOVEMBER 2010
7. Threshold(s) that is/are crossed or reached: vi, vii	5%

8. Notified details:

A: Voting rights attached to shares viii, ix

Class/type of shares	Situation previous to the triggering transaction
if possible using the ISIN CODE	Number of Shares	Number of Voting Rights
E00B3WJHK45	31,215,852	31,215,852

Resulting situation after the triggering transaction
Number of shares	Number of voting rights		% of voting rights x
Indirect	Direct xi	Indirect xii	Direct	Indirect
29,446,919		29,446,919		4.90%

B: Qualifying Financial Instruments
Resulting situation after the triggering transaction
Type of financial instrument	Expiration date xiii	Exercise/ Conversion Period xiv	Number of voting rights that may be acquired if the instrument is exercised/ converted.	% of voting rights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments xv, xvi
Resulting situation after the triggering transaction
Type of financial instrument	Exercise price	Expiration date xvii

Exercise/ Conversion periodConversion period xviii

Number of voting rights instrument refers to

% of voting rights xix, xx

Total (A+B+C)
Number of voting rights	Percentage of voting rights
29,446,919	4.90%

9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable: xxi
FMR LLC is the parent holding company of	721,844	BROWN BROTHERS HARRIMAN AND CO	FMRCO
Fidelity	94,655	BROWN BROTHERS HARRIMAN AND CO	FMRCO
Management & Research Company	1,206,385	CITIBANK NA	FMRCO
(FMRCO), Investinoni	354,306	MELLON BANK NA	FMRCO
Manager for US mutual funds, and FIL	305,132	MELLON BANK NA	PTC
Management Trust	676,222	NORTHERN TRUST CO	FRMRC
Company (FMTC) and Pyramis Global	6,447,126	STATE STREET BANK AND TR CO	FMR
Advisors Trust Company	5,150,768	STATE STREET BANK AND TR CO	FMRCO
(PGATC), a US states chartered bank	333,542	STATE STREET BANK AND TR CO	PTC
which acts as a trustee	374,174	STATE STREET BANK AND TR CO	PGATC
or investment manager of various pension	160,086	JP MORGAN CHASE BANK	FMR
and trust accounts	12,775,935	JP MORGAN CHASE BANK	FMRCO
and Pyramis Global Advisors LLC	519,111	CIBC MELLON TRUST (C)	FCL
(PGALLC)	327,632	MELLON BANK	PTC

Proxy Voting:
10. Name of the proxy holder:		FMR LLC
11. Number of voting rights proxy holder will cease to hold:		1,768,933
12. Date on which proxy holder will cease to hold voting rights:		17 NOVEMBER 2010
13. Additional information:
14. Contact name:	Robert Crayston
15. Contact telephone number:	[e-mail]

A: Identity of the persons or legal entity subject to the notification obligation
Full name (including legal form of legal entities)	INFORMA PLC
Contact address (registered office for legal entities)	22 Grenville Street, St Helier, Jersey JE4 8PX
Phone number & email	020 7017 4314 [e-mail]
Other useful information (at least legal representative for legal persons)	Julie Woollard Deputy Company Secretary

B: Identity of the notifier, if applicable
Full name
Contact address
Phone number & email
Other useful information (e.g. functional relationship with the person or legal entity subject to the notification obligation)

C: Additional information

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