Updates with pricing details
** American Superconductor's AMSC.O shares down 17.3% premarket at $28.50 after equity raise
** Ayer, Massachusetts-based power grid systems and solutions provider says sold ~4.1 mln shares at $28 for gross proceeds for $115.5 mln
** Offering price is 18.7% discount to stock's last close on Tues
** Co plans to use net proceeds for working capital and general purposes, including potential acquisitions
** Oppenheimer sole bookrunner for offering
** With ~39.5 mln shares outstanding, co has roughly $1.4 bln market cap
** AMSC shares on Tues closed up 4.1% at $34.45, up 40% YTD
** All 3 analysts covering AMSC are bullish with $39 median PT, LSEG data reflects
(Lance Tupper is a Reuters market analyst. The views expressed are his own)
((lance.tupper@tr.com 1-646-279-6380))