Plus a systematic way of keeping the Gini coefficient of wealth small in a sustainable way. I'm a fan of establishing sovereign wealth funds whose dividends are paid out equally per capita for this purpose.
Meanwhile you don't need the government to use tax dollars to buy stocks in specific companies. If you want a UBI then use VAT. Then it comes from every company instead of having government bureaucrats choose which ones, and gets paid out immediately instead of needing a generation of build-up.