Mettler Toledo Ltd  (Leicester, United Kingdom)
	Moore International Ltd  (Poole)
	M & M Controls  (Prestwich)
	M & M International (UK) Ltd  (Kempston)
	M A C S   (Manchester)
	M B K Motor Rewinds Ltd  (Coventry)
	M C D
	M Computer Technologies Ltd
	M D I S Ltd   (Livingston)
	M E C-Air (Pneumatics & Hydraulics) Ltd   (Bradford)
	M K Air Controls Ltd
	M K International Ltd   (Woking)
	M S A (Britain) Ltd
	M S T (UK)   (Ferndown)
	M Y Fans Ltd   (Oldham)
	M. A. V. Engineering Ltd  (Chard)
	M. Phillips   (Taunton)
	M.F. Hydraulics Ltd   (Cowley)
	M.J. Metalcraft Ltd
	M.J.M. Tyne & Wear Engineering Co. Ltd  (Washington)
	M.K.E. Electric Motor Sales   (Maidstone)
	M.Squared Instrumentation  (Southampton)
	M.W.M. (Engineering) Ltd  (Walsall)
	MA Instruments  (Yelverton)
	MAC Solutions (UK) Ltd  (Redditch)
	MacDonald Ventilating Co. Ltd
	Machine Vision Technology Ltd  (Leamington Spa)
	Machinery Diagnostic Services   (Tarporley)
	Machinery Safety Alliance   (Corby)
	Macro Sensors  (Pennsauken, USA)
	Magnelab, Inc  (Longmont, USA)
	Magnet Schultz Ltd (formerly Emessem Solenoid Co.)  (Woking)
	Magnetrol
	Magnetrol International UK  (Burgess Hill)
	Maidenhead Controls & Instrumentation Ltd   (Wotton-under-Edge)
	Maihak Aktiengesellschaft
	Main System Ltd  (Newhaven)
	Mainframe Communications Ltd   (Southend-on-Sea)
	Malta Development Corporation  (London)
	Malvern Instruments Ltd  (Malvern)
	Manrose Manufacturing Ltd
	Mantracourt Electronics Ltd  (Exeter)
	MAP80 Systems Ltd   (Wokingham)
	Maplesoft  (Waterloo, Canada)
	Maplesoft Europe Ltd  (Cambridge, UK)
	Marco Ltd  (Edenbridge)
	Marconi Naval Systems  (Barrow-in-Furness)
	Marcus Ltd   (Pudsey)
	Marelli UK Ltd  (Loughborough)
	Marl International Limited  (Ulverston)