** Vor Biopharma's VOR.O shares down 29% post-market at $13.35 as co seeks equity raise

** Autoimmune disease-focused biotech commences $100 mln stock offering

** JP Morgan, Jefferies, Citigroup and TD Cowen are joint bookrunners

** Boston-based VOR has ~6.84 mln shares outstanding for roughly $130 mln market cap, per LSEG data

** VOR effected a 1-for-20 reverse stock split in Sept

** VOR shares on Mon ended up 0.5% at $18.80

** Stock has gained ~449% over the past six months, putting it up ~15% YTD

(Lance Tupper is a Reuters market analyst. The views expressed are his own)

((lance.tupper@tr.com 1-646-279-6380))