[arthurcolle]

Insider trading easily lends itself to automation depending on the level of conspiratorial thinking you're willing to accept.

Consider the stakes - you have a multibillion dollar sub-portfolio (Medallion has current AUM of $118B according to some random site called InsiderMonkey, idk whether its legit or not). In 2016, the AUM was reported at $76B. His returns literally don't make any sense. You can't be right all the time. Anyways, so literally you wanna use a small fraction of that to fund the construction of a small discreet, strategic team that acquires information to gain edge in public markets. Simons has background in signals intelligence, and despite his later work, wouldn't it be an extremely obvious avenue to just forcibly acquire knowledge that is non-public and then place trades accordingly?

Simplest explanation is its definitely illegal. Every couple years, you hire some algebraic geometry PhD and boom, you chalk up all your returns to magic math. Doesn't make any sense.

[sokoloff]

Your accusation makes no sense.

If you simply bought the S&P 500 in Jan 2016 and held until now, you are up 78%. (76 goes to 135)

If you bought in Dec 2016 and held til now, you’re up 49% (76 goes to 113)

I find “they roughly tracked the market over the time cited” to be a far simpler explanation than “they’re definitely doing illegal insider trading and covering it up with math mumbo-jumbo.”

https://dqydj.com/sp-500-return-calculator/

[xibalba]

You've got bias in your sample of the S&P. Medallion has blown away the S&P over a few decade span. They had years of >100% return.

[sokoloff]

I simply picked the timeframe over which the accusation of illegal activity was leveled. (I'm not arguing that those are representative long-run returns; I am arguing that those are returns which are directly comparable to [and easily explain] the growth of AUM for the time period cited.)

[xibalba]

Ah, but your claim of parsimony just isn't. Assume that Renaissance has employed ~500 individuals over its existence, most of whom have become fabulously wealthy. You believe the simplest explanation is that none of those people would have "defected" by telling others about their dirty secret of insider trading?

[codyb]

50% returns in three years? Although 2016 - 2020 has been a pretty bullish market.

Seems like they do well during downturns too?