Scientists predict that a pair of supermassive black holes will merge together sometimes within the next three years.
The opposite of HFT is ULFT: stock trading on a gigayear timescale outliving the typical planetary civilization. Its biggest enemy is inflation -- meaning cosmological inflation, that nasty phenomenon tearing the universe apart and doing a number on intergalactic shipping indices. To quote an extremely recent earthling philosopher: intergalactic trade grows strong when elderly hominids plant {untranslatable #32} in whose {untranslatable #993} they know they shall never {untranslatable #440}.