Money Math

how I understand the Black-Scholes formula

Paid subs will recall my story of Doug teaching Black-Scholes to my cohort at SIG back in 2001. Four hours in one…

1 year ago

the GFC through a quant’s eyes

I can’t remember which of the 3 Todd Simkin interviews on my blog I summarized where he mentions it but…

1 year ago

calendar spreads through the eyes of a vol trader

I got long IBIT (BTC etf) when my April calls expired ITM. IBIT continued rallying, I was happy to stay…

1 year ago

Betting on PLTR to $40

Notable short seller Andrew Left’s firm Citron Research gave his “all roads lead to $40” pronouncement on X this week regarding PLTR 2.90%↑ : Created…

1 year ago

Vol drag is misunderstood…until now

Yesterday, we (yet again) discussed the topic of how vol drag affects the skewness of a return distribution. In particular…

1 year ago

Sparring with AI: Theoretical options p/l vs discrete hedging

A conversation with Claude Opus 4 KA: What is the compact formula for daily option pl that relates realized variance…

1 year ago

Why meme stock put spreads look expensive

I got words today tying back practically to Sunday’s Money Angle about the relationship of vol to stock distributions. It’s…

1 year ago

using elementary school geometry to explain gamma

In options land, you constantly hear the returns are “non-linear”, “convex”, or maybe even “have curvature”. It comes from the…

1 year ago

the dirties are down the cleans are up

On June 2nd I tweeted: June expiry in USO vol change on the 3% rally... OPEC agreed over the weekend to…

1 year ago

The “most important” gambling topic and a riddle

Non-self weighting strategy We watched Ocean’s Eleven with my older son Friday night (we’ve recently established a Friday night ritual…

1 year ago