** Shares of drug developer Atea Pharmaceuticals Inc
AVIR.O up 26.2% at $4.69
** Concentra Biosciences, an affiliate of investment firm
Tang Capital Partners, proposes to buy all outstanding shares of
AVIR
** Tang Capital owns 3.6% of AVIR
** Concentra intends to engage in discussions with AVIR to
negotiate the offer - 13D SEC filing
** Financial terms of the offer not disclosed
** AVIR has not yet responded to the offer
** Stock down 23% YTD
(Reporting by Aditya Samal)
((Aditya.Samal@thomsonreuters.com;))