It has vav which gets transliterated as v, u, o, or w. How does the average modern Hebrew speaker pronounce these company names in a sentence? Vix, Vayz, Viz? Is the "w" transliteration an example of Latin to Hebrew transliteration but not vice-versa?

It's pronounced the same as in English. Wiz, Waze, Wix. It's written with "double vav" in Hebrew, not just a single vav which would make it read as Viz.