a 24-year-old ex-openai researcher ran a fund to $45 billion with eight people, was up 439% net through june, and by the end of july had sold his entire public stock portfolio to ken griffin in a single block trade.
griffin described this exact failure mode two years ago, asked why portfolio managers wash out at citadel:
"you have a portfolio that is extraordinarily highly concentrated, you have large positions, you cannot demonstrate a clear and concise competitive advantage in why you own those positions."
"and there are some people that just, with full information, are unable to help themselves and get to a better portfolio construction."
he was also asked the opposite question in the same interview, why citadel keeps working, his third and final answer was this:
"it's experience. it's the price paid in losses and pain that converts into wisdom. my leadership team, we've been through a lot of very difficult moments of the markets together. we've learned some very bitter lessons. but it makes us much more effective as investors in periods of turmoil and crisis."
citadel started in november 1990. situational awareness started in 2024, long AI infrastructure and short software at roughly 4x leverage. both legs went against it in the same three weeks.
there was no bitter lesson priced into that book yet.
that's what got bought.
he wasn't wrong about AI. he was wrong about the construction of his book.
Bill Ackman spoke on how get through a very low and negative time in your life…
This is probably one of my favorite clips of all time, I re-watch it very often.
Philadelphia wants to embrace LeBron James like Los Angeles never did, per @tjonesonthenba.
The governor declared Friday “LeBron James Day,” while the mayor welcomed him into the “One Philly Family.” 🙏