** Shares of heart valve maker Anteris Technologies AVR.O rise as much as 6.8%; last up 4.2% at $5.84 in early trading
** Wall Street brokerages start coverage of AVR as IPO research quiet period comes to an end
** Barclays initiates coverage with "overweight" rating and $22 PT, a 292.2% upside to stock's last close
** Brokerage says AVR's transcatheter aortic valve replacement (TAVR) platform is positioned to capture 4%-5% of the U.S. TAVR market
** Adds that the timing for AVR's entry into TAVR could not look better
** TD Cowen initiates coverage with "buy" rating and $15 PT, a 167.4% upside to stock's last close
** Brokerage says AVR's TAVR platform has disruptive potential that fills unmet needs in the industry
** Adds that AVR should capture meaningful share in the ~$10 bln TAVR market
** TD Cowen, Barclays and Cantor were the joint book-running managers for AVR's IPO
** As of last close, AVR shares down 6.5% since Nasdaq debut on Dec. 13
(Reporting by Arasu Kannagi Basil in Bengaluru)
((ArasuKannagi.Basil@thomsonreuters.com;))