Holding(s) in Company

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi

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

ISG plc

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

An acquisition or disposal of voting rights

✓

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

Cathexis Stocks, LP

4. Full name of shareholder(s)

(if different from 3.):iv

(1) Cathexis Stocks, LP holds 6,317,101 ordinary

shares;

(2) N.Y. Nominees Limited holds 3,195,231 ordinary shares as nominee for Cathexis Stocks, LP;

(3) N.Y. Nominees Limited holds 19,055,845 ordinary shares as nominee for Cathexis Stocks, LP;

(4) Goldman Sachs Securities (Nominees)Limited

holds 3,100,011 ordinary shares as nominee

for Cathexis Stocks, LP;

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

February 19, 2016

6. Date on which issuer notified:

February 22, 2016

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

63.3% - 64.0%

  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

Ordinary Shares

31,298,188

31,298,188

31,668,188

31,668,188

64.0%

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

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:

14. Contact name:

15. Contact telephone number:

Annex: Notification of major interests in sharesxxii

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

Full name

(including legal form of legal entities)

Cathexis Stocks, LP

Contact address

(registered office for legal entities)

1000 Louisiana St, Suite 7000, Houston, TX 77002

Phone number & email

1+713.400.3352

[email protected]

Other useful information

(at least legal representative for legal persons)

B: Identity of the notifier, if applicable

Full name

Fran Jandjel

Contact address

1000 Louisiana St, Suite 7000, Houston, TX 77002

Phone number & email

1+713.400.3352

[email protected]

Other useful information

(e.g. functional relationship with the person or legal entity subject to the notification obligation)

Director

C: Additional information