Case Study · The Skew Flipped
Free to readWhen the Skew Flipped — GameStop, January 2021
Equity skew is almost always tilted toward puts. For a few days in January 2021, relentless call buying flattened it — the kind of regime the Slope component is built to catch.
The cleanest way to understand the Slope component is to watch a name where it broke its own rule. In a normal stock, Slope is firmly negative — puts trade richer than calls because everyone wants downside protection. The January 2021 meme squeeze inverted that intuition: the crowd wanted upside, violently, and the skew told you so before the headlines did.
The setup
Through the back half of January 2021, a coordinated retail bid turned GameStop into a short-and-gamma squeeze. Options activity exploded and implied volatility went vertical. From January 21 to January 27 the stock rose roughly 1,500%, peaking around January 27–28 before brokers restricted trading. The options market wasn't pricing a possible crash — it was pricing a possible moonshot.
Price acceleration; option volume surges; IV spikes. Level explodes; Slope starts flattening as call demand floods in.
Squeeze peaks (~+1,500% on the run). Slope flattens hard toward zero — on the hottest squeeze names it briefly inverted, calls bid like puts. Curvature blows out as both wings get paid.
Trading restrictions; the bid breaks. Level stays extreme but begins to recede; Slope reverts back toward its normal negative tilt.
What the deconstruction showed
Three things happened at once, and the deconstruction separated them. Level went to a reading you'd almost never see in a major name — overall IV in the hundreds of percent. Slope, normally deeply negative, flattened dramatically toward zero as call IVs caught up to and rivaled puts; the structural put-skew temporarily dissolved. Curvature spiked too — both tails were bid, because nobody knew whether the next move was a vertical melt-up or an air-pocket down. A single "skew" number would have just said "huge." The components told you it was a demand-for-calls regime, not a fear regime.
Illustrative of the regime change, not a price chart. The squeeze lifted the whole curve (Level) and flattened the put-skew (Slope toward zero), with both wings bid (Curvature).
Slope is the tell. A name whose Slope flattens toward zero — or inverts — is a name where the crowd is paying up for calls, not puts. That's the structural signature of a squeeze, and it shows up in the Slope component while price is still going vertical. RiskDex®, which Slope drives, would have screamed the same thing.
The trade the components pointed to
A flattened or inverted Slope is a relative-value statement: calls are rich versus their usual discount to puts. The clean expression is a risk reversal read in reverse — when the normal put-over-call premium has vanished, structures that are long the (now-cheap-relative) put skew and short the (now-rich) call skew carry the edge, sized for the fact that a squeeze can stay irrational longer than you can stay solvent. The exploding Level and Curvature are the warning: this is not a quiet mean-reversion; it's a violent regime where short-vol of any kind is dangerous.
This case study is free. To deconstruct a single name like GME yourself you need ETF + Equities; to replay the components across the squeeze, the historical series is an Everything capability.
See plans →Educational content from Nations Indexes. Event facts (squeeze dates, the ~1,500% run, IV surge, trading restrictions) are historical and verifiable. Component descriptions characterize how the options market priced risk; the figure is an illustrative recreation, not a price chart, and nothing here is investment advice.