has been held for 50 % by the latter and by law

[Alex16]

Then, from XXX to XXX 2007, Tomskneft’s capital was controlled by ___ and, since December 2007, it has been held for 50 % by the latter and by JSC XXX.

50% [акционерного] капитала (акций) принадлежит ___ (последней компании), а 50% - АО ХХХ.

?

[Irisha]

в равных долях между ... и ...
или (по) 50% акций принадлежало...
Вы не то ОАО иксами закрасили. :-) Да по-любому это открытая информация.

[Alex16]

:-)
it has been held - значит "принадлежит", а не "принадлежало"?

[Irisha]

ну да, "принадлежит"