HGG.L Regulatory News (HGG)

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

1. Identity of the issuer or the underlying issuerof existing shares to which voting rights areattached:

Henderson Group PLC

JE00B3CM9527, AU000000HGG2

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

n/a

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

n/a

An event changing the breakdown of voting rights

n/a

Other (please specify):

n/a

3. Full name of person(s) subject to thenotification obligation:

UBS Investment Bank

UBS Group AG

4. Full name of shareholder(s)  (if different from 3.):

UBS AG London Branch

UBS Limited

UBS Securities Australia Limited

5. Date of the transaction and date onwhich the threshold is crossed or reached:

19 May 2017

6. Date on which issuer notified:

25 May 2017

7. Threshold(s) that is/are crossed orreached:

5% Section A

6% Section (A+B+C)

8. Notified details:

A: Voting rights attached to shares

Class/type ofshares

if possible usingthe ISIN CODE

Situation previousto the triggeringtransaction

Resulting situation after the triggering transaction

NumberofShares

NumberofVotingRights

Numberof shares

Number of votingrights

% of voting rights

Direct

Indirect

Direct

Indirect

JE00B3CM9527

AU000000HGG2

Below Notifiable Threshold

Below Notifiable Threshold

-

-

66,895,432

-

5.91%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate

Exercise/Conversion Period

Number of votingrights that may beacquired if theinstrument isexercised/ converted.

% of votingrights

Right to Recall lent shares

-

Any Time

2,450,800

0.22%

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Exercise price

Expiration date

Exercise/Conversion period

Number of voting rights instrument refers to

% of voting rights

Equity Swaps

-

From 30-05-17 To 11-05-20

-

9,434,003

Nominal

Delta

-

0.83%

Total (A+B+C)

Number of voting rights

Percentage of voting rights

78,780,235

6.96%

9. Chain of controlled undertakings through which the voting rights and/or thefinancial instruments are effectively held, if applicable:

UBS Group AG is a group holding company for UBS Investment Bank business. Voting rights are held through its controlled undertakings as set out below.

UBS AG:

- directly through its branches: UBS AG London Branch - 12,831,511 (1.13%);

- indirectly through its subsidiaries: UBS Limited - 351,032 (0.03%) and

- indirectly through its subsidiaries: UBS Securities Australia Limited - 65,597,692 (5.80%)

Proxy Voting:

10. Name of the proxy holder:

11. Number of voting rights proxy holder will cease to hold:

12. Date on which proxy holder will cease to hold voting rights:

13. Additional information:

14. Contact name:

Jamie Bonney / David Iglesias

15. Contact telephone number:

+41 44 239 8058