Disney has supported basic rights for LGBTQ+ people. This is one of those things which pretty much isn't up for debate anymore in most other developed countries. Beyond that, Disney has been solidly pro-corporate, anti-union, and generally right wing in its policies. I'm unaware of any stances Netflix and Salesforce have taken beyond similar support for LGBTQ and lip service to "racism is bad". Again, as far as I know, their economic stances are solidly anti-union, anti-worker, and pro-corporate.
None of those are "leftist".
Staff support is entirely different than institutional corporate support. Is Amazon leftist because one of its warehouses just unionized? No, it fought (and is fighting) that union effort tooth and nail. Similarly, Google has punished staff who were too open with their leftist beliefs.
Nor is support for the Democratic party "leftist". The Democratic party is split between neoliberals (who would be considered right of center anywhere else) and social democrats (who would be considered center left anywhere else) for the most part (with some rare Democratic Socialists who might actually qualify as leftist).
Hillary Clinton is a prime example of this. Anywhere but the United States, she would be considered solidly center right. It is only in the United States, where Fox News, et al have dragged the spectrum so far to the right that anything less than neo-fascist or anarcho-capitalist is considered left, where you could even pretend these corporations had a less than rightward slant.
Edit: I will note, this dragging of the spectrum is one of many, many reasons why I try to avoid spectrum based labels (left/right, etc) and stick to actual ideological labels. There is no single "leftist". There are Democratic Socialists, State Socialists, Communists, various flavors of Anarchist, etc who all get grouped together as "leftist", but generally don't agree on much. The other group of ideologies that get grouped with leftist are those supporting historically oppressed minorities - antiracism, antipatriarchy, and pro-lgbtq+ rights. Again, these are discrete ideologies and while people who subscribe to one often subscribe to the others, just as often they don't.
Similarly on the right, neo-facist, neoconservative, paleoconservative, evangelical theocrat, and anarcho-capitalist (the proper term for US libertarians) all get grouped together under the heading "right". When many of these ideologies are (or should be) completely at odds with each other.