The 26-year-old Harry Potter star's has appeared in a searchable database containing more details about the Panama Papers tax-dodging scandal.
A staggering 11 million documents, said to be from secretive Panama law firm Mossack Fonseca, reveal how the rich and famous legally avoid paying tax using offshore companies.
Prime ministers, presidents, celebrities and Fifa officials are among those who have been exposed.
But Watson’s spokesman claims she listed her company in the British Virgin Islands to protect her privacy.
According to reports Watson is anxious over her security, including unwanted approaches by her fans.
In 2014, it was revealed she was forced to hire a bodyguard for £90,000 to protect her from stalkers.
Watson’s spokesman said: "Emma (like many high profile individuals) set up an offshore company for the sole purpose of protecting her anonymity and safety.
"UK companies are required to publicly publish details of their shareholders and therefore do not give her the necessary anonymity required to protect her personal safety, which has been jeopardised in the past owing to such information being publicly available.
"Offshore companies do not publish these shareholder details.
"Emma receives absolutely no tax or monetary advantages from this offshore company whatsoever – only privacy."
Among those listed in the Panama Papers was Prime Minister David Cameron’s late dad, Ian, who died in 2010.
Using offshore companies is legal but Mr Cameron has repeatedly slammed schemes that hold money out of British jurisdictions to avoid UK tax as "morally wrong".
