"A hedge fund copycat strategy which typically holds 50 positions would have outperformed the S&P 500. Minimum trading is required: four times per year when a few stocks are sold and bought (rebalancing to equal weights)." https://imarketsignals.com/2021/outperforming-the-sp-500-with-50-consensus-stock-holdings-of-40-large-hedge-funds/ …
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Replying to @ReformedTrader
The trick: "Hedge funds considered had to have Assets Under Management (AUM) greater than $3.5 billion and to have outperformed the S&P 500 Total Return from 2008, and also over the last 3 years."
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Replying to @SuperLopez_85
Yep - it may be an effect of survivorship bias.
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Replying to @ReformedTrader @SuperLopez_85
It’s not even survivorship bias — it is literally picking the hedge funds with the best performance over this period and discarding the others. It is 100% a look-ahead effect.
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Replying to @macrocephalopod @SuperLopez_85
I agree. The 13F effect more generally (which doesn't use past returns as a filter) could be an effect of survivorship bias. I don't know the answer to that one.
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Yeah definitely could be — hard to figure that one out!
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