Rigetti Computing rises as Mizuho initiates with 'outperform'
** Quantum computing firm Rigetti Computing's RGTI.O shares rise ~1% to $26.39 premarket ** Mizuho initiates coverage on stock with "outperform" rating ** Brokerage sets PT at $50, implying an upside of 91.4% to stock's last close ** Average rating of 8 analysts is "buy," their median PT is $37 - data compiled by LSEG ** Up to last close, stock has risen 71.2% this year (Reporting by Anhata Rooprai in Bengaluru) ((Anhata.Rooprai@thomsonreuters.com))