Its not clear if Alibaba's founder Jack Ma has been arrested, but BABA shares are plunging

Bloomberg terminal story notes:

• Chinese authorities in the city of Hangzhou, home base to Alibaba Group Holding Ltd. and Ant Group Co., have imposed"compulsory curbs" on an individual surnamed Ma, state broadcaster CCTV reported Tuesday.
• The person,who was otherwise unidentified, was placed under the so called controls on April 25 after being accused of inciting subversion of state power and other activities that endangered national security, CCTV said in its brief report, without elaborating.

Its not clear if its Jack Ma of Alibaba. BABA shares were cut by around 9% but have since rebounded somewhat.

UPDATE - further info from China security authorities indicate its not Jack Ma.

eur EUR The euro (EUR) is the official currency of the European Union (EU) and 19 of 27 member states at the time of writing. It is the second most-traded currency worldwide in forex markets after the US dollar.The euro was originally introduced back on January 1, 1999, having replaced the European Currency Unit. Banknotes and physical euro coins subsequently entered circulation only in 2002.Upon its adoption, the euro replaced domestic currencies in participating EU member states. The rise in its value The euro (EUR) is the official currency of the European Union (EU) and 19 of 27 member states at the time of writing. It is the second most-traded currency worldwide in forex markets after the US dollar.The euro was originally introduced back on January 1, 1999, having replaced the European Currency Unit. Banknotes and physical euro coins subsequently entered circulation only in 2002.Upon its adoption, the euro replaced domestic currencies in participating EU member states. The rise in its value Read this Term