(Bloomberg) -- Sequoia Fund was co-founded in 1970 by a friend of Warren Buffett’s who believed in focusing on “your best six ideas in life.” These days, the $7.8 billion fund has only needed one idea to crush its competition.

Representing 26% of the portfolio, Valeant Pharmaceuticals International is leading Sequoia past 99% of peers in 2015 and 98 percent over five years, according to data compiled by Bloomberg. The acquisitive drugmaker’s surging stock accounts for 85% of Sequoia’s gain in 2015.

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