Holding(s) in Company

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

Ultra Electronics Holdings plc

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

An acquisition or disposal of voting rights

Yes

An acquisition or disposal of qualifying financial instruments which may result in the acquisition of shares already issued to which voting rights are attached

No

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

No

An event changing the breakdown of voting rights

No

Other (please specify):

No

3. Full name of person(s) subject to the notification obligation:

Ameriprise Financial, Inc. and its group

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

See additional information under 13

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

29 April 2010

6. Date on which issuer notified:

30 April 2010

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

Above the threshold of 5%

8. Notified details:

A: Voting rights attached to shares

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

Direct

Direct

Indirect

Direct

Indirect

GB0009123323

N/A

N/A

74,506

74,506

3,509,449

0.108%

5.126%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date

Exercise/ Conversion Period

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

Exercise/ Conversion period

Number of voting rights instrument refers to

% of voting rights

CFD

15,908

Nominal

Delta

0.023%

Total (A+B+C)

Number of voting rights

Percentage of voting rights

3,599,863

5.257%

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

Ameriprise Financial, Inc, which through intermediate holding companies controls the voting rights of Threadneedle Management Luxembourg S.A. and Threadneedle Asset Management Holdings Ltd, which itself controls the voting rights of Threadneedle Asset Management Ltd, Threadneedle International Ltd and Threadneedle Pensions Ltd.

Proxy Voting:

10. Name of the proxy holder:

N/A

11. Number of voting rights proxy holder will cease to hold:

N/A

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

N/A

13. Additional information:

Registered Owner

Littledown Nominees Ltd A/c 38295 28,783

The Bank of New York (Nominees) Limited A/c 961111 4,523

Chase Nominees Ltd A/c 42048 24,418

State Street Nominees Limited A/c 00401323 62,626

Ameriprise Financial Inc A/c 58,102

HSBC Global Custody Nominees (UK) Ltd A/c 1013333 8,994

The Bank of New York (Nominees) Limited A/c 10602670 2,242

The Bank of New York (Nominees) Limited A/c PTG 10972 1,371

HSBC Global Custody Nominees (UK) Ltd A/c 01014405 2,249

Merrill Lynch Nominees A/c XTHRF21 15,908

William & Glyns (Isle of Man) Nominees Ltd A/c 301778 12,241

William & Glyns (Isle of Man) Nominees Ltd A/c 301781 7,778

Littledown Nominees Ltd A/c 02891 1,508,274

Littledown Nominees Ltd A/c 05577 74,500

Littledown Nominees Ltd A/c 05576 786,000

The Bank of New York (Nominees) Limited A/c 52262 92,441

Littledown Nominees Ltd A/c 07197 41,200

Littledown Nominees Ltd A/c 10479 2,000

State Street Bank & Trust Boston A/c GPEI 102,522

The Bank of New York (Nominees) Limited A/c 960011 10,437

Littledown Nominees Ltd A/c 07203 30,400

Littledown Nominees Ltd A/c 21667 8,900

Littledown Nominees Ltd A/c 34789 67,800

The Bank of New York (Nominees) Limited A/c PTG 1476 13,000

Littledown Nominees Ltd A/c 10497 179,895

Littledown Nominees Ltd A/c 10491 33,779

Littledown Nominees Ltd A/c 10488 193,000

Littledown Nominees Ltd A/c 10490 104,000

Littledown Nominees Ltd A/c 30337 40,491

Littledown Nominees Ltd A/c 31348 81,989

14. Contact name:

David Garbett-Edwards, Company Secretary

15. Contact telephone number:

01242 225039