Rosslyn Data Regulatory News (RDT)

Rosslyn Data Technologies plc

(the "Company", "Rosslyn" or the "Group")

Holdings in Company

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

ROSSLYN DATA TECHNOLOGIES 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 thenotification obligation: iii

MITON GROUP PLC

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

5. Date of the transaction and date onwhich the threshold is crossed orreached: v

15/05/2017

6. Date on which issuer notified:

16/05/2017

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

10%

8. Notified details:

A: Voting rights attached to shares viii, ix

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 x

Direct

Direct xi

Indirect xii

Direct

Indirect

GB00BKX5CP01

7,817,346

7,817,346

14,966,955

14,966,955

7.95%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate xiii

Exercise/Conversion Period xiv

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

% of votingrights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments xv, xvi

Resulting situation after the triggering transaction

Type of financialinstrument

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

14,966,955

7.95%

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

CF MITON UK SMALLER COMPANIES FUND

14,966,955

Proxy Voting:

10. Name of the proxy holder:

11. Number of voting rights proxy holder will ceaseto hold:

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

13. Additional information:

THE FIGURE OF 188,130,067 ORDINARY SHARES HAS BEEN USED AS THE DENOMINATOR FOR THIS CALCULATION.

14. Contact name:

GEORGE LATIMER-BUTLER

15. Contact telephone number:

0203 714 1486