# Unusual OI growth shift toward calls

Canonical: https://halfonadouble.com/screens/unusual-call-oi-growth-shift
Data through: 2026-10-16 close
Publisher: Half on a Double

Where did the balance of call-versus-put OI growth shift unusually far toward calls on Oct 16, 2026?

Rising call OI with a growth advantage over puts, and a call-minus-put growth gap at least two standard deviations toward calls 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.

4 published matches, in the same order as the HTML screen.

| Ticker | Close (USD/share) | Open interest (contracts) | Call / put growth and gap surprise |
| --- | --- | --- | --- |
| [ETN](https://halfonadouble.com/stock/ETN) | 391.25 | 123,796 | Calls +99.1% · puts -18.7% · gap +117.8 pp · gap +13.27σ |
| [JBS](https://halfonadouble.com/stock/JBS) | 13.03 | 198,146 | Calls +54.8% · puts -5.6% · gap +60.4 pp · gap +10.73σ |
| [XBI](https://halfonadouble.com/stock/XBI) | 144.32 | 565,719 | Calls +4.0% · puts -15.2% · gap +19.3 pp · gap +4.52σ |
| [KNX](https://halfonadouble.com/stock/KNX) | 64.81 | 161,941 | Calls +16.6% · puts -28.6% · gap +45.2 pp · gap +2.62σ |

An em dash means unavailable or not applicable, not zero. [Definitions and limitations](https://halfonadouble.com/methodology.md).