The answer to this question may become vitally important to the global financial system.

Some of you may guess that they are all Tech IPO's in 2019.
Except that WeWork hasn't managed to go IPO yet. I'll get back to that point shortly.

Some of you may guess that they are all losing money hand-over-fist, and you would be right.

Scores of spirited demonstrators, including many Uber and Lyft drivers and others showing solidarity, rallied outside Uber headquarters in San Francisco’s Mid-Market district on Wednesday to demand rideshare companies improve driver pay and working conditions.

Tomorrow will witness Uber's IPO, and thousands of "investors" will throw billions of dollars into Uber stocks.
Uber's IPO filing stated such gems as it has “incurred significant losses since inception” and expects its operating expenses to “increase significantly in the foreseeable future.”