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July 15 (Reuters) - Eli Lilly LLY.N is in talks to acquire psychedelic drugmaker AtaiBeckley ATAI.O and a deal could be announced as soon as this week, Bloomberg News reported on Wednesday, citing people familiar with the matter.

AtaiBeckley shares soared 66% in aftermarket trading, while Lilly was flat. AtaiBeckley was up 31% so far this year and had a market value of $1.97 billion as of Wednesday's close, according to LSEG data.

Lilly is negotiating a deal at a premium, Bloomberg News said.

Eli Lilly and AtaiBeckley were not immediately available for comment outside regular business hours.

New York-based AtaiBeckley focuses on psychedelic-based treatments for mental health conditions and is developing BPL-003, an intranasal formulation of 5-MeO-DMT for treatment-resistant depression.

The company's shares received a boost this year after U.S. President Donald Trump ordered health regulators to speed up reviews of psychedelic treatments and increased federal funding for their research.