That may've been the case at Unimatrix-01, but Borg that were not around her may've continued to function normally despite here death. This is supported by the fact that the Borg Sphere that was pursuing Voyager continued to function (and attack Voyager, weakening it's armor) even after the Queen had died.
Dow and Union Carbide to merge: two companies that have profited from the deaths of thousands. By Martin McLaughlin. 6 August 1999. Dow Chemical and Union Carbide announced a corporate merger Wednesday, with Dow acquiring control of the smaller firm through a stock swap and assuming its debts, in a deal worth $11.6 billion.
The Dow Jones index is not set in stone; companies have been added and subtracted over the years. The Dow 30 started out as the Dow 12 in 1896, but by 2012, only General Electric from the original 12 was still a member of the Dow.