тяжеловес – English translation

heavy-weight; heavy; heavyweight; behemoth (The economist: For good or for ill, multidisciplinary behemoths like Deloitte seem to be the future of professional services. nosorog)

Игорь Миг

bigwig; mandarin; outsize figure; top dog; top honcho; power player

busin.

extraweight

econ.

bulky goods; deadweight cargo

ed.

heavy hitter (a person or company that has a lot of power, especially in business or politics. LDOCE. She spoke to a room full of political heavy hitters. Their company is one of the industry's heavy hitters. MWALD Alexander Demidov)

fig.

powerhouse (Ремедиос_П)

giant (warsheep)