| A & P Instruments | A Plus Systeme Automation | A&D Company | A&G Martinelli s.r.l. |
| A. W. Chesterton Company | A.A.G. STUCCHI | A.H. Systems Inc. | A.J.T. Equipment Limited |
| A.L.E. Systems Inc. | A.R. Wilfley & Sons | A+S Sensortechnik GmbH | A1 PROs CO., LTD. |
| A1-Envirosciences GmbH | Aabspec | AAEON Technology Inc. | AAF – AmericanAirFilter |
| AALBORG | Aaronia AG | Aartec AG | AATI AnalogicTech |
| AB Brookhuis Micro Electronics | AB Trasmissioni Srl | ABB | ABBEY ELECTRONIC CONTROLS |
| ABEL Pump Technology | ABER Hydraulic | Abiss – Aneolia | ABL SURSUM |
| ABM Greiffenberger | ABM Sensor Technology Inc. | ABS Trenchless | Absopulse Electronics |
| AC Marine A/S | AC-CESS | Accutech Instruments | ACDC Dynamics |
| Ace Electrostatic | ACI – Automation Components, Inc. | ACI Air Control Industries | ACI Hoist & Crane |
| Acim Jouanin | ACKSYS Communications & Systems | ACMA ( Industrias AMAT SL) | ACME Electric |
| Acoem Group | Acoplamientos Albert S.L. | Acrison Inc. | ACRN |
| Acro Associates | Acromag | ACS Motion Control | ACS-Control-System |
| ACT- American Technical Ceramics | Act Electric Industry Co.,Ltd. | Active Sensors Inc. | ACTREG |
| Actronic | Actuatech | Aculight – Lockheed Martin | Acumentrics |
| ACU-RITE | Adactech Technologies | ADAFRUIT | ADALET |
| Adash | Adcon Telemetry | Additel Corporation | ADE Sensor Limited |
| Adel System s.r.l. | Adept Technology | ADEUNIS RF | ADEV |
| ADE-WERK GmbH | ADEX Corporation | ADI – Air Dimensions | Adixen Alcatel Vacuum Technology |
| Adlee Powertronic | Adler Spa | ADLINK TECHNOLOGY | ADM electronic |
| ADOS | ADOS GmbH | ADOS S.r.l. | ADS Transicoil |
| Ads-Tec GmbH | Advanced Interconnections | Advanced Micro Peripherals | Advanced Motion Controls |
| Advantech | Advantest Corporation | ADZ Nagano Sensortechnik | AE&T |
| AE.CAS. | A-EBERLE | AEC Allis Electric | AEC Magnetics |
| AECL Autotronic Enterprise | AECO Sensors SRL | AEES | AEG POWER SOLUTIONS |
| AEMC Instruments | Aeon International | Aerodyne Controls | Aeroflex |
| Aeron Systems | Aerotech Inc. | AERSERVICE Srl | Aerzener Maschinenfabrik |
| AES Aircraft Elektro-Elektronik System | AES CHEMUNEX | Afag | AFCON Software and Electronics |
| AFEC All Favor Enterprise | AFIMES | AGI Automation Components | Agilent Technologies |
| Agromatic AG | Ahlborn Mess- und Regelungstechnik GmbH | AHP Merkle | AIC Magnetics |
| AICHI ELEC COMPANY | AICSYS | AIMCO Corporation | AIMU DENKI KOGYO |
| AIR TORQUE Spa | AIRMAN Hokuetsu Industries | AIRTEC Pneumatic | AIS |
| AI-TEK Instruments | Aic-Analog Integrations | Aichi Pump Kogyo Co. Ltd. | Aichi Tokei Denki |
| Aichi-Pump (APC) | Aignep s.p.a. | Aihara Denki | Aikoh Engineering |
| Aimtec | Aimu | Aioi Seiki – Pascal Corporation? | Air Deviser Industrial |
| Air Logic | Air Squared | Air System Pneumatic | Airbest Pneumatics |
| AirBorn | AirCare Automation | AirCom Pneumatic | Aircomp Stampotecnica |
| Airflex | Airgo Networks | Airmat Technologie | Airpax |
| Airpot Corporation | Airtac International | Airtec Productive Environment | Airtecnics |
| Airtrol Components | Airtx International | Airwork srl Pneumatic Equipment | Akamatsu Denki – Onikaze |
| Akerströms Björbo AB | AKO Armaturen & Separations | Albany Pump | Albert Fezer Maschinenfabrik |
| ALBERT GmbH | Albin Pump S.A.S | Albright International | Alco Valves |
| ALCORTEK s.r.l. | ALEMITE | Alfa Electric | Alfa Laval Corporate AB |
| ALFAMATIC srl | Alfatronix | Algodue Elettronica s.r.l. | Alicat Scientific |
| Alicona | Alkon Corporation | All Earth Technology | Alldoo Micropump |
| Allegro MicroSystems | Allen Gears | Allen-Bradley | Allied Motion |
| Allied Vision Technologies | Alltech Dosieranlagen | ALLTORQ | Alluris GmbH |
| ALLWEILER GmbH | Alma Pompe | ALMATEC Maschinenbau | Almeco |
| Alpha Moisture Systems | Alpha Omega Instruments | Alpha Power Supplies | Alpha Slip Rings |
| Alpha Wire | Alphasense | ALPS Electric | ALRRA |
| Alstom | Altech Corporation | ALTEK Industries Corp | Altronic LLC |
| ALV-Laser Vertriebsgesellschaft | Alxion | AMBER wireless | Ambrell |
| AMCA Hydraulic Fluid Power | AMCC Applied Microcircuits | Amer SpA | Ameridrives Couplings |
| AMETEK Automation & Process Technologies | AMETEK Drexelbrook | AMETEK PMT Products | AMETEK SENSORS |
| AMETEK SWITCH | AMF Andreas Maier | AMISCO S.p.a. | AMK Arnold Müller |
| AMO GmbH | Amongo Technology | AMOT | AMP |
| Amphenol | Amphenol RF | Amphenol Alden Products Company | Amphenol Socapex |
| Amprobe | Amprobe Test Tools | Amptek | AMS Advanced Micro Systems |
| AMS Analysen Mess und Systemtechnik | AMS Messtechnik | Anacon Power & Controls | Anadigics |
| Anaheim Automation | Anaheim Scientific | Analog Devices | Analytic Systems Ware LTD. |
| Andantex USA | Anderson Instrument Company | ANDERSON POWER | Andilog Technologies |
| Andocksysteme G. Untch | Andor Technology | ANDRITZ | Andrin |
| Anest Iwata | ANILAM | ANLY | Anton Paar |
| ANVER Corp. | AO Smith | AOIP SAS | Aoki Seimitsu Kogyo |
| AoliPump | AOS Technology | AP Tech Advanced Pressure Technology | AP2E |
| APC | APC MGE | APEM Components | Apex Dynamics Inc. |
| Apex Microtechnology | API – Automated Precision | API Advanced Photonix | API Automated Precision |
| APISTE | APLITEX | Aplicaciones Tecnologicas | Aplisens S.A. |
| APM Automation Solutions | Apollo Gößnitz | Apollo Valves – Conbraco Industries | APPA |
| APP-Anderson Power Products | Applied Analytics Group | Applied Geomechanics | Applied Measurements |
| Applied Robotics | Applimotion | APT Advanced Protection Technologies | APT Associated Power Technologies |
| Aptek Instrumentation | APTIV | APV | AquaLab |
| Aquametro AG | Aquasant | Aquatrol Safety Valve & Relief Valve | AR RF/Microwave Instrumentation |
| ARBO Pompen en Filters | ARBOR Technology | ARC Systems | ARCA Regler |
| ARCEL | Arcolectric | ARCoptix S.A | Arcotec GmbH |
| ARCURE | Arcus Technology | ARDETEM | AREVA T&D |
| ARGAL s.r.l. | ARGO-HYTOS | ARI-Armaturen | ARIS Antriebe und Steuerungen |
| Aries Ingeniería y Sistemas | Arizona Instrument LLC | ARLA Maschinentechnik | ARM Ltd |
| Armagard Ltd. | Arman Ltd. | Armatherm Günthel Fabrik technischer Messinstrumente | Armaturenbau GmbH |
| Armaturenfabrik Franz Schneider | Armaturenwerk Hötensleben | Armstrong International | Arnold Magnetic Technologies |
| ARO Fluid Technologies | ARPEGE MASTER K | Arrow Gear Company | Arrow Hart – Cooper Wiring Devices |
| Arrow Precision Motor | Arrowhead Rockdrill | Art Photonics | Artec Group |
| Arteche | ARTIS | Arven s.r.l. | Arya Crafts & Engineering |
| ASA Hydraulik | ASA Srl | Asahi Keiki | ASA-Schalttechnik |
| ASC Advanced Sensors Calibration | Ascell Sensor | ASCHROFT | ASCO Joucomatic Numatics |
| Ascon Corporation | Ascott Analytical Equipment | ASEM S.P.A. | Ashcroft |
| Ashida Electronics | Asiagauge International | ASK Corporation – ASK Co.,Ltd. | Aslec |
| ASM Automation | ASM GmbH | ASO Safety Solutions | Aspen Pumps Limited |
| Aspirnova2000 | Assemtech | ASSMANN Electronic GmbH | ASSO s.r.l. |
| AST Accurate Sensors Technologies | AST- American Sensor Technologies | Astec Power | ASTEEL SENSOR |
| Astris Energi | ASTRO Motorengesellschaft | Astrodyne | Astro-Med |
| ATB Austria Antriebstechnik | ATB Schorch GmbH | ATC DigiTec | ATC-Automatic Timing & Control |
| ATEK Antriebstechnik Willi Glapiak | ATEQ | ATEXIS | ATI – Automation Technology Incorporated |
| ATI-Analog Technologies | ATI-Analytical Technology | ATIM Radiocommunications | Atlanta Antriebssysteme E. Seidenspinner |
| Atlantic Plastics Ltd | ATLAS Material Testing Technologies BV | Atmel Corporation | ATMI |
| ATOMTEX | Atop Technologies | Atos Spa | ATR Industrie Elektronik |
| Attocube Systems AG | AuCom Electronics | Audio Precision | AUGIER S.A.S |
| AUK Müller | AUMA Riester | Aupax Industrial | AUREL s.p.a. |
| Aurora Pump | Ausco Products | Austriamicrosystems | Autec s.r.l. |
| Autem | AuthenTec | Auto Maskin AS | Autoclave Engineers |
| Autogard (Rexnord Industries) | Automata | Automated Logic | AUTOMATIC TIMING & CONTROLS |
| Automatic Systems | Automation Direct | Automax | Automec srl |
| Autonics | Autorotor | Avago Technologies | Avalue Technology |
| Avatar Instruments | Avcon Controls | Avenisense | Avery Weigh-Tronix |
| Avesta Ltd. | Avex CCTV | Avisaro AG | AVK Holding A/S |
| Avocent Corporation | AVS Automatik Ventiler System AB | AVS ELECTRONICS | AVX Corporation |
| Awa Instruments | AWF S.A. | Axiomtek | AXOR Industries |
| Axotec Technologies | AYONIS | AZ Armaturen | AZ Pneumatica |
| Azbil Group | Azeta Zeo Asioli Diffusion Srl | | | |
