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:

Hampson Industries PLC

2. Reason for notification (yes/no)

An acquisition or disposal of voting rights

X

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

An event changing the breakdown of voting rights

Other (please specify):______________

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

Henderson Global Investors

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 June 2012

6. Date on which issuer notified:

8 June 2012

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

Direct

Number of voting rights

Percentage of voting rights

Direct

Indirect

Direct

Indirect

GB00B0P8RT68

14,802,370

14,802,370

4,644,148

1.66%

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 Financial Instrument

Exercise Price

Expiration date

Exercise/Conversion period

Number of voting rights instrument refers to

% of voting rights

Nominal

Delta

Total (A+B +C)

Number of voting rights

Percentage of voting rights

4,644,148

1.66%

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

Name of Company/Fund Number of Shares % of Issued Share Capital

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:

14 Contact name:

Malcolm Dolan

15. Contact telephone number:

01384 485345