REG-Psion PLC: Holding(s) in Company

TR-1 (i) NOTIFICATION OF MAJOR INTERESTS IN SHARES

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

PSION PLC - GB00BOD5VH57

2. Reason for the notification State
Yes/No

An acquisition or disposal of voting rights Yes

An acquisition or disposal of financial instruments which may No
result in the
acquisition of shares already issued to which voting rights are
attached

An event changing the breakdown of voting rights No

Other (please specify): No

3. Full name of person(s) subject to the UBS Global Asset Management -
notification obligation (iii): Traditional

4. Full name of shareholder(s) (if UBS Global Asset Management
different from 3.) (iv): (Americas) Inc.

UBS Global Asset Management
(Australia) Limited

UBS Global Asset Management Life
Limited

UBS Global Asset Management (UK)
Limited

5. Date of the transaction (and date on 12 May 2009
which the threshold is crossed
or reached if different) (v):

6. Date on which issuer notified: 14 May 2009

7. Threshold(s) that is/are crossed or 6.03%
reached:

8. Notified details:

A: Voting rights attached to shares

Class/type Situation previous Resulting situation after the triggering
of shares to transaction (vii)
if possible the Triggering
using the transaction (vi)
ISIN CODE

Number Number Number Number of voting % of voting
of of of rights (ix) rights
Shares Voting shares
Rights
(viii)

Direct Direct Indirect Direct Indirect
(x) (xi)

GB00B0D5VH57 7,207,494 7,207,494 8,473,186 637,851 7,835,335 0.45% 5.58%

B: Financial Instruments

Resulting situation after the triggering transaction (xii)

Type of Expiration Exercise/Conversion Number of voting % of
financial date (xiii) Period/ Date (xiv) rights that may be voting
instrument acquired if the rights
instrument
is exercised/c
onverted

Total (A+B)

Number of voting rights % of voting rights

8,473,186 6.03%

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

UBS Global Asset Management (Americas) Inc. - 857,812 (0.61%)

UBS Global Asset Management (Australia) Ltd - 48,369 (0.04%)

UBS Global Asset Management Life Limited - 637,851 (0.45%)

UBS Global Asset Management (UK) Limited - 6,929,154 (4.93%)

Proxy Voting:

10. Name of the proxy holder: UBS Global Asset
Management on behalf of a
number of asset management
clients

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: Louise Meads, Company Secretary

15. Contact telephone number: +44 20 3008 5158

END