What happened to Quotron systems inc.?

Answer 1

Citibank purchased Quotron in 1986 and held on until 1994 when Quotron was sold to Reuters. By the time of the Reuters purchase Quotron was much smaller than in their 70's - 80's heyday.

Quotron's Advantage AE product survived and was marketed as Reuters Plus.
This product was actively used through the '90s as a market data application by professional traders and brokers.

Quotron staff in NY were rolled into Reuters America and moved to 1700 Broadway.
By 1994 the LA manufacturing arm that produced all those Quotron terminals and custom hardware had been scaled back to bare minimum. Development staff for Advantage AE continued to work in the LA site through the mid 90's.