Unusual OI growth shift toward puts
Where did the balance of call-versus-put OI growth shift unusually far toward puts on Oct 16, 2026?
Rising put OI with a growth advantage over calls, and a call-minus-put growth gap at least two standard deviations toward puts relative to its own prior year. The gap has its own standardized history; subtracting the separate call and put z-scores is not this measure. Requires 200 prior comparisons, 100,000 current contracts and 1,000 contracts on each side at the prior close. This measures the OI balance, not implied-volatility skew. Data through close. Descriptive only, not a recommendation.
At a glance
5 tickers qualified. First five: TGB (Calls -5.9% · puts +31.0% · gap -36.9 pp · gap -9.01σ), IYR (Calls -20.4% · puts +40.4% · gap -60.8 pp · gap -7.74σ), XLP (Calls -4.4% · puts +24.0% · gap -28.4 pp · gap -4.30σ), GRAB (Calls -5.0% · puts +5.7% · gap -10.7 pp · gap -2.98σ), AKAM (Calls -2.2% · puts +5.3% · gap -7.5 pp · gap -2.52σ).
| # | Ticker | Close | Open interest | Call / put growth and gap surprise |
|---|---|---|---|---|
| 1 | TGB | 7.97 | 101,876 | Calls -5.9% · puts +31.0% · gap -36.9 pp · gap -9.01σ |
| 2 | IYR | 97.39 | 191,092 | Calls -20.4% · puts +40.4% · gap -60.8 pp · gap -7.74σ |
| 3 | XLP | 87.62 | 648,584 | Calls -4.4% · puts +24.0% · gap -28.4 pp · gap -4.30σ |
| 4 | GRAB | 2.94 | 2,228,242 | Calls -5.0% · puts +5.7% · gap -10.7 pp · gap -2.98σ |
| 5 | AKAM | 87.81 | 292,423 | Calls -2.2% · puts +5.3% · gap -7.5 pp · gap -2.52σ |
Screens describe what the data shows after the close. They are not trade recommendations; see the disclaimer and the methodology.