** Sana Biotechnology's SANA.O shares down 12.7% premarket to $3.71 after $75 mln overnight follow-on priced
** Seattle, Washington-based firm late Weds announced ~22.4 mln shares, including ~1.5 mln p re-funded warrants
** Offering price of $3.35 represents 18.5% discount to stock's last sale
** Co, which develops engineered cells to treat diseases, plans to use net offering proceeds to support its preclinical and most advanced product candidates, per the prospectus
** Morgan Stanley, Goldman Sachs, BofA and TD Cowen are joint bookrunners for the offering
** With ~225.5 mln shares outstanding, co has roughly $960 mln market cap
** SANA shares on Weds edged down 0.2%, trimming YTD gain to 161%
** 6 of 7 analysts rate SANA "strong buy" or "buy", and 1 has "hold" rating and median PT is $9, LSEG data reflects