(Bloomberg) -- Stock picker futility may be back, courtesy of Apple.

The iPhone maker, under-owned by the majority of actively managed funds according to Citigroup, has jumped 13% this month to a record, poised for its best return relative to the S&P 500 in three years. Its contribution to the benchmark gauge is almost four times greater than any other stock. At $81 billion, the increase in Apple's market cap this month alone exceeds the value of 85% of the index's members.

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