** Shares of 3D printer co Stratasys SSYS.O up 20.1% on Mon to $11.18, about a 10-month high, after announcing equity investment from existing holder

** SSYS on Sun said Israeli PE firm Fortissimo Capital to invest $120 mln via direct purchase of ~11.7 mln newly issued shares

** Purchase price of $10.30 represents 10.6% premium to last close of SSYS shares on Fri

** With this investment, Fortissimo boosting it holdings from ~1.5% to ~15.5% of SSYS's total shares outstanding

** In connection with the investment, Yuval Cohen, Fortissimo managing partner, to be appointed to board of SSYS, replacing a current director

** SSYS has ~71.39 mln shares outstanding for roughly $800 mln market cap, per LSEG data

** With move on Mon, shares up ~25% YTD following ~38% decline in 2024

** Separately, shares of peer 3D Systems DDD.N up ~5% on the session, possibly in sympathy with SSYS

** Both stocks bucking the trend on Mon as Wall Street's main indexes slide on Trump tariff jitters .N

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

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