# Unusual put open interest accumulation

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

Which put OI increases were unusually large for their own ticker on Oct 16, 2026?

Positive daily put contract changes at least two standard deviations above their preceding-year norm. Requires at least 200 prior observations and 100,000 current total contracts. Calls and puts are standardized separately. More open contracts do not establish who bought or sold them.

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

| Ticker | Close (USD/share) | Open interest (contracts) | Call / put daily OI surprise |
| --- | --- | --- | --- |
| [TGB](https://halfonadouble.com/stock/TGB) | 7.97 | 101,876 | Calls -1.06σ · puts +9.95σ · Put change +6071 contracts |
| [IYR](https://halfonadouble.com/stock/IYR) | 97.39 | 191,092 | Calls -2.40σ · puts +5.51σ · Put change +44609 contracts |

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