HEAD­QUAR­TERS: New York City FOUNDERS: Bradley Rothen­berg (CEO), Greg Schroy EM­PLOY­EES: 82

Rothen­berg, 35, is build­ing next-gen­er­a­tion de­sign soft­ware that re­lies on math­e­mat­i­cal com­pu­ta­tions to cre­ate 3D-printed parts and prod­ucts that are lighter and more ef­fi­cient than would be pos­si­ble with older CAD sys­tems. The nTop soft­ware has, for ex­am­ple, been used to redesign brack­ets for space satel­lites and to make more-ef­fi­cient spinal cages for back surgery. De­spite the pan­demic, it raised an ad­di­tional $42 mil­lion in June, led by In­sight Part­ners. Other in­vestors in­clude Canaan and Lock­heed Martin, which is also a cus­tomer. The fresh cap­i­tal will help nTop ex­pand as in­dus­tries in­clud­ing aero­space, au­to­mo­tive and health care adopt 3D print­ing for fu­ture prod­ucts such as elec­tric vehicles. Rev­enue is ex­pected to more than triple this year, to $5 mil­lion, up from $1.5 mil­lion in 2019.

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