So no, Apple is not the big tech with the most cash. They do have a much higher market cap than the others but it's simply based on their brand image and speculation.
It's based on their consistently enormous income generation.
Apple has $114 billion in operating income over the past four quarters. Alphabet is close to $75b by comparison; Microsoft is $83b; Meta is $29b. Amazon is a joke at $12b (which is increasingly being reflected in their very mediocre stock market performance; Amazon stock has nearly contracted on an inflation adjusted basis over five years).
For large corporations like Apple, Microsoft, Meta, Alphabet, etc., profit generation is overwhelmingly what matters. Apple has led the way on that for a long time now and it's reflected in their market cap.
Apple: ~$395bn Microsoft: ~$200bn Amazon: ~$500bn Meta: $116bn
Amazon extracts a poor margin out of their $514 billion in sales. Over the past four quarters their operating income margin is a pathetic ~2.4%.
Apple's operating income margin is ~29.4% by comparison. They have a vastly superior business.
Eventually Amazon investors will tire of the terrible stock market returns that present Amazon is generating and the garbage that is retail and they'll demand the company split itself up. That will involve spinning off AWS so investors can realize max value for that (before it's too late and growth slows to a crawl in that space).
So it refers to a credit balance, and it does not mention investments.