Holding(s) in Company

TR-1: Notifications of Major Interests in Shares

1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached:

Senior plc

(LEI - 5493002HQHWN5JQHKQ51)

2. Reason for notification (yes/no)

An acquisition or disposal of voting rights

An acquisition or disposal of financial instruments which may result in the acquisition of shares already issued to which voting rights are attached

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

X

An event changing the breakdown of voting rights

Other (please specify):

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

Henderson Group plc

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

5. Date of transaction (and date on which the threshold is crossed or reached if different):

7 July 2017

6. Date on which issuer notified:

10 July 2017

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

Below 5%

8: Notified Details

A: Voting rights attached to shares

Class/type of shares

If possible use ISIN code

Situation previous to the triggering transaction

Resulting situation after the triggering transaction

Number of shares

Number of voting rights

Number of shares

Number of voting rights

Percentage of voting rights

Direct

Indirect

Direct

Indirect

GB0007958233

17,645,400

17,645,400

Below 5%

Below 5%

B: Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date

Exercise/ conversion period/date

No. of voting rights that may be acquired (if the instrument exercised/converted)

Percentage of voting rights

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 periodi

Number of voting rights instrument refers to

% of voting rights

Nominal

Delta

CFD

Below 5%

Below 5%

Total (A+B+C)

Number of voting rights

Percentage of voting rights

Below 5%

Below 5%

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

See Annex 1 below.

Proxy Voting:

10. Name of 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:

This disclosure has been calculated based on total voting rights outstanding amount 419,416,250.

14. Contact name:

Andrew Bodenham, Company Secretary, Senior plc

15. Contact telephone number:

01923 775547

Annex 1: Information in relation to the person subject to the notification obligation (please tick the applicable box):

[ ] Person subject to the notification obligation is not controlled by any natural person or legal entity and does not control any other undertaking(s) holding directly or indirectly an interest in the (underlying) issuer.xiii

[X] Full chain of controlled undertakings through which the voting rights and/or thefinancial instruments are effectively held starting with the ultimate controlling natural person or legal entityxiv:

Namexv

% of voting rights if it equals or is higher than the notifiable threshold

% of voting rights through financial instruments if it equals or is higher than the notifiable threshold

Total of both if it equals or is higher than the notifiable threshold

Janus Henderson Group plc, Henderson Group Holdings Asset Management Limited, HGI Asset Management Group Limited, Henderson Global Group Limited, Henderson Holdings Group Limited, HGI Group Limited, Henderson Global Investors (Holdings) Limited, Alphagen Capital Limited

-

Below 5%

Below 5%

Janus Henderson Group plc, Henderson Group Holdings Asset Management Limited, HGI Asset Management Group Limited, Henderson Global Group Limited, Henderson Holdings Group Limited, HGI Group Limited, Henderson Global Investors (Holdings) Limited, Henderson Global Investors Limited

Below 5%

Below 5%

Below 5%