This is based on companies' longevity in the top ten rankings. You might dispute RCA's place but it was one of only four companies (the other three being TI, Motorola and GE) which made the transition from being a top ten discrete transistor supplier to becoming a top ten IC supplier. RCA was a top tenner for over 20 years and was also, of course, the great pioneer of CMOS.
Fairchild
Intel
Motorola (now Freescale)
Philips (now NXP)
NEC
Toshiba
Samsung
RCA

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