▁company ▁Sec ur ic or ▁am alg am ated ▁with ▁Dan ish ▁business ▁Group ▁ 4 ▁Fal ck . ▁The ▁company ▁offers ▁a ▁range ▁of ▁services , ▁including ▁the ▁supply ▁of ▁security ▁personnel , ▁monitoring ▁equipment , ▁response ▁units ▁and ▁secure ▁prisoner ▁transport ation . ▁G 4 S ▁also ▁works ▁with ▁govern ments ▁over se as ▁to ▁deliver ▁security . ▁ ▁G 4 S ▁is ▁the ▁world ' s ▁largest ▁security ▁company ▁measured ▁by ▁reven ues . ▁It ▁has ▁operations ▁in ▁more ▁than ▁ 9 0 ▁countries . ▁With ▁over ▁ 5 7 0 , 0 0 0 ▁employees , ▁it ▁is ▁the ▁world ' s ▁third - larg est ▁private ▁employ er , ▁the ▁largest ▁European ▁and ▁African ▁private ▁employ er , ▁and ▁among ▁the ▁largest ▁on ▁the ▁London ▁Stock ▁Exchange . ▁G 4 S ▁has ▁a ▁primary ▁listing ▁on ▁the ▁London ▁Stock ▁Exchange ▁and ▁is ▁a ▁constitu ent ▁of ▁the ▁F T SE ▁ 2 5 0 ▁Index . ▁ ▁The ▁company ▁has ▁been ▁critic ized ▁and ▁involved ▁in ▁numerous ▁controvers ies . ▁ ▁History ▁ ▁Orig ins ▁G 4 S ▁has ▁its ▁orig ins ▁in ▁a ▁guard ing ▁business ▁founded ▁in ▁C open hagen ▁in ▁ 1 9 0 1 ▁by ▁Mar ius ▁Hog ref e , ▁originally ▁known ▁as ▁K ø ben hav n ▁Freder iks berg ▁N atte v agt ▁( C open hagen ▁and ▁Freder iks berg ▁Night ▁Watch ) ▁and ▁subsequently ▁renamed ▁Fal ck ▁( F al con ). ▁ ▁In ▁ 2 0 0 0