Intersil in particular has suffered from many acquisitions and divestitures.
The Wikipedia page mentions that Harris acquired it, but there is a particular datapoint which tells me that they were briefly held by GE:
Around the time my daughter was born, circa 1984, I went to a job interview. My interviewer brought out an Intersil databook, for which he asked me to explain the importance of certain parameters in a component datasheet.
I distinctly remember the data book with soft black covers, which had a photo of a steaming light bulb with the caption: GE and Intersil. Hot ideas in CMOS.
By then, GE had already acquired RCA. But shortly thereafter, "Neutron Jack" Welch became GE's CEO and he publicly stated that he hated electronics companies, and promptly disposed of all the assets, including its homegrown semiconductors, to Harris.
At least that is how I recall it, but my memory may be fading.