** Shares of Disc Medicine IRON.O down 3.7% at $56.31 before the bell after follow-on priced
** Watertown, Massachusetts-based firm late Weds sold 4.1 mln shares, including 181,818 pre-funded warrants, for $225.5 mln gross raise
** Offering size boosted from $200 mln, and priced at $55, 6% discount to last sale
** Co plans to use net offering proceeds to fund research, clinical development of its product candidates, support potential commercialization of its treatment for erythropoietic protoporphyria (EPP), a rare disease that causes painful sensitivity to light
** IRON shares on Tues rose ~4% to close at $60.52 after co received positive feedback from US FDA for bitopertin in EPP, saying it planned to file new drug application later this year
** Co has 29.7 mln shares outstanding for roughly $1.7 bln market cap
** Through Weds close, shares off 7.7% YTD, but have risen about 25% over past three months. Stock's 1-yr high is $77.60 (Mar 4) and 1-yr low is $25.60 (Apr 1)
** Jefferies, Leerink, Stifel and Cantor jt bookrunners for stock offering