Plexus Regulatory News (POS)

Plexus Holdings plc ('Plexus' or 'the Company')

Total Voting Rights

Plexus Holdings PLC, the AIM quoted oil and gas engineering services business and owner of the proprietary POS-GRIP® friction-grip method of wellhead engineering confirms that, following the exercise of employee options during December 2015, the Company issued and allotted 19,843 new Ordinary Shares of 1p per share ("Ordinary Shares") from its block listing of 2,000,000 shares admitted to AIM on 20 February 2014 pursuant to the Plexus Holdings Plc 2005 Share Option Scheme.

Following the issue of the Ordinary Shares, the total number of shares in issue and with voting rights is 89,390,576. This figure may be used by shareholders in the Company as the denominator for the calculation by which they will determine if they are required to notify their interest in, or a change of interest in, the share capital of the Company under the Financial Service Authority's Disclosure and Transparency Rules.

**ENDS**

For further information please visit www.posgrip.com or contact:

Notes to Editors:

Plexus Holdings PLC, which began trading on AIM in December 2005, is an oil and gas engineering and services business, which supplies wellhead and mudline suspension equipment for exploration and production applications. Based in Aberdeen, with offices in London, Cairo, Kuala Lumpur, Singapore and a presence in Houston, Texas, it has developed and patented a friction-grip method of engineering for oil and gas field wellheads and connectors, POS-GRIP®, which involves deforming one tubular member against another to effect gripping and sealing.

The Company plans to accelerate the roll out of POS-GRIP wellhead equipment as a superior alternative to current technology and for it to become the future industry standard for wellhead design. In particular, the technology has advantages in High Pressure/High Temperature (HP/HT) and Extreme HP/HT (X-HP/HT) oil and gas environments, for which there is growing global demand and where Plexus is being increasingly recognised as the supplier of choice. Importantly, the Company is focussed on extending its proprietary technology into an increasing number of subsea applications. In line with this, in March 2011 the Company launched a Joint Industry Project ('JIP') initiative to develop a new subsea wellhead design, HGSS™, utilising its friction-grip technology in collaboration with key oil and gas operators and service companies. BG, Royal Dutch Shell, Wintershall, Maersk, TOTAL, Tullow Oil, ENI, Oil States Industries Inc., and the UK entity of the world's largest offshore drilling company have joined the initiative to date as Consulting Partners. The JIP is nearing completion and the resultant HGSS subsea wellhead design will include a combination of key features never before seen in a subsea wellhead which include being rated to 15,000 psi, 4,000,000 pounds of 'instant' casing lockdown capacity, and importantly rigid metal annular seal technology qualified to match the performance of premium connectors. The JIP will also be designing solutions for annulus pressure monitoring and access for 'bleed off' capability to address sustained casing pressure ('SCP') issues which for many years have been recognised by the industry as a serious industry problem. The design process has now been completed, with testing is due for completion end 2014, and the running of a prototype in the field targeted for the second half of 2015.

To date, POS-GRIP wellhead systems have been used or selected to be used in over 300 oil and gas wells by international companies including AGR, Apache Energy Australia, BHP Billiton, BG International, Bowleven plc, BP, Brunei Shell Petroleum, Cairn Energy, Centrica, ConocoPhillips, Dana Petroleum, Dubai Petroleum, GDF SUEZ, Global Santa Fe, Maersk, Niko Resources, Petro-Canada Trinidad & Tobago, Red Sea Petroleum Operating Company, Repsol, RWE, Senergy Limited, Shell China, Shell Egypt, StatoilHydro, Silverstone Energy, Talisman Energy, Tullow Oil, and Wintershall.