[piva00]

Sixty years is perhaps too long, neoliberalism really kicked off in the 80s/90s with an increase in globalisation, and corporate consolidation through M&As ramped up quickly in the 2000s after financialisation of the economy went in high gear. If we backtrack to the last thirty to forty years and check which top 20 companies got to that spot through M&As it might paint a different picture.

[Turing_Machine]

1990 list:

1 General Motors

2 Ford Motor

3 Exxon Mobil

4 Intl. Business Machines

5 General Electric

6 Mobil

7 Altria Group

8 Chrysler

9 DuPont

Again, Exxon Mobil is the only overlap with 2020's list. (I presume that the references to "Exxon Mobil" in the 1990 and 1960 lists actually refer to pre-merger Exxon, since Mobil by itself is also on both lists).

I checked, and of the 2020 list, only AT&T, McKesson, and Exxon even existed in 1960 (Berkshire Hathaway kinda did, but they made shirts. Warren Buffet didn't come along and turn it into an investment operation until 1965.

Edit: list formatting.