Holding(s) in Company

HALMA p.l.c.

NOTIFICATION OF MAJOR INTERESTS IN SHARES

In conformity with the Transparency Directive, Halma p.l.c. ('Halma') is required to announce to the market the receipt of notifications of major interests in shares. Halma received the notice below on 11 November 2011 in respect of Massachusetts Financial Services Company.

Carol Chesney

Company Secretary, Halma p.l.c.

Tel +44 (0)1494 721111

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

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

Halma p.l.c.

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

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

An event changing the breakdown of voting rights

Other (please specify):

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

Massachusetts Financial Services Company

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

MFS invests in securities of the issuer on behalf of its various mutual funds and institutional account clients.

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

9 November 2011

6. Date on which issuer notified:

11 November 2011

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

5%

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

Direct

Indirect

Direct

Indirect

GB0004052071

18,849,270

18,849,270

18,904,896

5.0113%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate

Exercise/conversionPeriod

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

% of votingrights

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

Resulting situation after the triggering transaction

Type of financialinstrument

Exerciseprice

Expirationdate

Exercise/Conversionperiod

Number of votingrights instrumentrefers to

% of voting rights

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

18,904,896

5.0113%

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

Halma p.l.c. - 0405207

Holdings as of 9 November 2011

Entity

Holding

Percentage held

MFS Investment Management (MFS)

7,114,594

1.8859%

MFS Heritage Trust Company (MFSHE)

111,923

0.0297%

MFS Institutional Advisors, Inc. (MFSI)

1,410,169

0.3738%

MFS International Ltd. (MIL)

3,750,250

0.9941%

MFS International (U.K.) Limited (MIL U.K.)

6,517,960

1.7278%

Notifiable interest

18,904,896

5.0113%

Shares outstanding

377,244,620

Proxy Voting:

10. Name of the proxy holder:

N/A

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

N/A

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

N/A

13. Additional information:

14. Contact name:

15. Contact telephone number:

Annex to Notification of Major Interests in Shares

A: Identity of the person or legal entity subject to the notification obligation

Full name (including legal form for legal entities)

Massachusetts Financial Services Co.

Contact address (registered office for legal entities)

500 Boylston Street

Boston, MA 02116

USA

Phone number & email

617-954-5814

Other useful information (at least legal representative for legal persons)

Robert Flaherty