OKW Enclosures Ltd  (Fareham)
	OMAL S.p.A.  (Rodengo Saiano, Italy)
	Omega Engineering Ltd  (Irlam)
	OC Robotics  (Filton, Bristol)
	Oil Tank Supplies Ltd  (Moreton-in-Marsh)
	Oil-Dri (UK) Ltd  (Wisbech)
	Okazaki Manufacturing Company  (Taffs Well)
	OL Sealing Systems  (London)
	Oliver Valves Limited  (Knutsford)
	Oliver Wight EAME   (Gloucester)
	Olmec-UK Ltd  (Barton-Upon-Humber)
	Olsen Engineering UK Ltd  (Newtown)
	Olympus Industrial  (Southend-on-Sea)
	Opal-RT Technologies Inc.  (Montreal, Canada)
	OPC Training Institute  (Alberta, Canada)
	Open Date Equipment (UK) Ltd  (Mitcham)
	Optris GmbH  (Berlin, Germany)
	Orbit Pumps  (Trafford Park)
	Origin IT Systems Ltd
	Orion Fans (Division of Knight Electronics)  (Dallas, USA)
	Orseal Ltd  (Bolton)
	Orthos (Engineering) Limited  (Market Harborough)
	Ovivo Water (formerly Eimco Water Technologies)  (West Bromwich)
	Owlstone Ltd  (Cambridge)