Bloomberg was a partner at Solomon Brothers, where he developed their in house IT systems. Solly infamously demutualized, under John Gutfreund, and in that pro

Bloomberg was a partner at Solomon Brothers, where he developed their in house IT systems. Solly infamously demutualized, under John Gutfreund, and in that process, Bloomberg left, presumably with any IP waivers he needed (after all, they had to get partners to agree to be paid off, and that was a political battle) and from that position, it was I imagine, certainly easier, to attract Merril to invest in the new venture, as 50% partners. Merill later sold i think all but a token stake, and Bloomberg was the majority buyer for their shares. At no time did Michael Bloomberg work for Merill Lynch. His timing, and trading, was impeccable. Solly was long the 800lb gorilla of fixed income. Coming from a former partner, the intimacy he had with the intriciacies of data (especially the archaic clearing systems he led to be automated, literally Solomon Brothers cared only for their front desks by habit, legendarily earning so much as to get away with a devil may care attitude long past when most firms would have been bust by conterparties declaring oprisk indigestible) he probably could have held a beauty parade for potential investors. Merril was probably chosen for two equally important characteristics, however: passivity as investors, and out size retail salesforce, immediate users for new equities data products Bloomberg wanted to launch. Pretty sure they were long one of the largest Tandem customers, and may still rum Tandem for messaging. As noted in other comments, their messaging is nigh bullet proof. As is also noted in other comments, they give a real damn about latency, so make telcos (at least telco sales reps) weep no doubt more than most customers. If there is a lesson for the startup world, i think it is this (besides way to trade to get his investment): there are apparently infinite messaging products, and a multiple thereof of features for messaging, but if you want to grow a high margin niche monopoly, or just a business period, build your messaging like civilization itself depends on it. How many hundreds of billions in capital have been made and lost in what are essentially messaging products? But name one that can count a few nines of reliability you'd entrust your capital, your family's emergencies, your daily banking, to, that is on the web?