Josh Gruss made a fortune by investing in music royalties that included tracks from the Beatles.
Paris now has claim to the world's biggest stock market, taking the crown from London.
The shares tumbled as much as 48% on Thursday in the biggest selloff since the company went public in 2015.
U.K.-listed depositary receipts of Russian companies are evaporating in value as sanctions take effect.
BBA is among many companies that have cited U.S.-China tensions in their latest earnings releases.
Analysts expect the company's profits to increase even further.
This bank upped its share price targets for the two tech giants.
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