1956 Companies
125 3M 281.9
328 Abbott Laboratories 91.7
234 Abex 147.1
185 ACF Industries 190.8
178 Admiral 202.4
126 Aeroquip-Vickers 281.5
476 Alan Wood Steel 58.4
278 Alco Products 120.7
33 Alcoa 845.0
141 Allegheny International 255.2
311 Allied Mills 97.8
65 Allis-Chalmers 535.1
220 Altria Group 157.0
399 AM International 73.4
49 AMAX 660.2
303 Amerada Hess 101.8
423 American Agricultural Chemical 68.7
253 American Bakeries 139.0
396 American Bosch Arma 73.8
39 American Can 714.8
305 American Chain & Cable 101.1
79 American Cyanamid 451.1
411 American Enka 71.3
410 American Forest Products 71.3
441 American Metal Products 63.5
81 American Motors 441.1
413 American Optical 71.0
99 American Standard 339.6
136 American Viscose 259.4
386 American Zinc, Lead & Smelting 76.7
204 American-Marietta 165.3
240 AMF 145.0
14 Amoco 1,781.3
107 Amstar 325.9
371 Amsted Industries 80.7
52 Anaconda 636.2
239 Anaconda Wire & Cable 145.2
284 Anchor Hocking 113.8
455 Anderson-Prichard Oil 61.0
179 Anheuser-Busch 201.7
167 Archer Daniels Midland 221.0
174 Arden Farms 212.3
43 ARMCO 692.7
9 Armour 1,967.7
144 Armstrong Holdings 249.4
421 Armstrong Rubber 69.0
427 Arvin Industries 67.4
64 Asarco 540.5
147 Ashland 245.9
12 AT&T Technologies 1,853.3
72 Atlantic Richfield 513.0
462 Atlas Powder 60.3
315 Automatic Canteen 95.8
114 Avco 299.3
422 Avon Products 68.9
153 A.O. Smith 237.1
Since 1955, when the first FORTUNE 500 was created, more than 1,800 companies have appeared on the list. Many of these companies have changed names over this period, owing to mergers, acquisitions, and bankruptcies. Other companies have gone private, or simply changed their names.

Companies are listed by the name with which they were associated in 2005, or at the time of their most recent list appearance before that. FORTUNE 500 companies that have been acquired by other FORTUNE 500 companies are listed under the name of the acquiring company. Rankings have been revised to reflect corrections in data.
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