Aptitude Regulatory News (APTD)

1.

Name of the issuer

2.

State whether the notification relates to (i) a transaction notified in accordance with DR 3.1.4R(1)(a); or

(ii) DR 3.1.4(R)(1)(b) a disclosure made in accordance with section 324 (as extended by section 328) of the Companies Act 1985; or

(iii) both (i) and (ii)

MICROGEN PLC

(i)

3.

Name of person discharging managerial responsibilities/director

4.

State whether notification relates to a person connected with a person discharging managerial responsibilities/director named in 3 and identify the connected person

CLARE GROOM

N/A

5.

Indicate whether the notification is in respect of a holding of the person referred to in 3 or 4 above or in respect of a non-beneficial interest

6.

Description of shares (including class), debentures or derivatives or financial instruments relating to shares

SEE 3 ABOVE

ORDINARY SHARES OF 5P EACH

7.

Name of registered shareholders(s) and, if more than one, the number of shares held by each of them

8

State the nature of the transaction

CLARE GROOM

SALE OF SHARES

9.

Number of shares, debentures or financial instruments relating to shares acquired

10.

Percentage of issued class acquired (treasury shares of that class should not be taken into account when calculating percentage)

N/A

N/A

11.

Number of shares, debentures or financial instruments relating to shares disposed

12.

Percentage of issued class disposed (treasury shares of that class should not be taken into account when calculating percentage)

20,000 SHARES

0.02%

13.

Price per share or value of transaction

14.

Date and place of transaction

20,000 SHARES SOLD AT A PRICE OF 118 PENCE

21 MARCH 2013, UK

15.

Total holding following notification and total percentage holding following notification (any treasury shares should not be taken into account when calculating percentage)

16.

Date issuer informed of transaction

33,970 SHARES

0.04%

21 MARCH 2013

17

Date of grant

18.

Period during which or date on which it can be exercised

N/A

N/A

19.

Total amount paid (if any) for grant of the option

20.

Description of shares or debentures involved (class and number)

N/A

N/A

21.

Exercise price (if fixed at time of grant) or indication that price is to be fixed at the time of exercise

22.

Total number of shares or debentures over which options held following notification

N/A

N/A

23.

Any additional information

24.

Name of contact and telephone number for queries

INFORMATION IS BASED ON THE COMPANY'S CURRENT ISSUED SHARE CAPITAL WHICH IS 82,527,244

ANJUM O'NEILL, COMPANY SECRETARY, MICROGEN PLC: 020 7496 8100

Name and signature of duly authorised officer of issuer responsible for making notification

ANJUM O'NEILL, COMPANY SECRETARY, MICROGEN PLC

Date of notification: 21 MARCH 2013

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