Notification of major interest in shares

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

Clarkson PLC

2 Reason for the notification (please tick the appropriate box or boxes):

An acquisition or disposal of voting rights

X

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: ⁱⁱⁱ

Mason Hill Advisors, LLC

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

Nortrust Nominees Limited is a nominee shareholder in respect of 149,290 shares in Clarkson PLC and Goldman Sachs International is a nominee shareholder in respect of 818,075  shares in Clarkson PLC.

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

23 April 2013

6. Date on which issuer notified:

26 April 2013

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

if possible using
the 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

% of  voting rights ^x

Direct

Direct ^xi

Indirect ^xii

Direct

Indirect

761,402

761,402

967,365

967,365

5.10%

ORDINARY SHARES ISIN:GB002018363

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 period ^xviii

Number of voting rights instrument refers to

% of voting rights ^{xix, xx}

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

967,365

5.10%

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

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:

Mason Hill Advisors, LLC acts as an investment manager for Equinox Partners, LP and Mason Hill Partners, LP.

Equinox Partners, LP  beneficially holds 818,075 (or 4.31%) of the shares in Clarkson PLC described above and Mason Hill Partners, LP beneficially holds 149,290 (or 0.79%) of the shares in Clarkson PLC described above.

14. Contact name:

Roger Anscher

15. Contact telephone number:

+001 646 833 2788