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A comment on IBM is splitting itself into two public companies. Parent comment

Re:IBM is splitting itself into two public companies by WalterBright on Friday October 09, 2020 @04:58PM (#24734363)
Keep going back in time. RCA, for example, used to be the biggest market cap company. Now, few people even know it ever existed.
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Re:IBM is splitting itself into two public companies by areyousure on Friday October 09, 2020 @05:22PM (#24734584)
I do plan to go back farther in time; I think it will also be interesting.

The claim about RCA seems unlikely. Radio Corporation of America stock grew very fast through the 1920s, peaking in September 1929 before the crash. However, even at the very end, it doesn't seem to even have been top 10 among industrials in the S&P index: http://piketty.pse.ens.fr/files/McGrattanPrescott2001.pdf#pa...

Instead, on that list we have companies like General Motors, General Electric, and Standard Oil of New Jersey that were still big in 1960 (and as mentioned above, some still so in the last decade).

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