# Put writers underneath — NSE scan

> Heavy put open interest under an uptrend — option sellers paid to defend the levels below.

Canonical: https://patternsradar.com/screener/put-support

```sift
from fno where pcr_oi > 0.8 and close > sma(50)
```

A put-call ratio above 0.8 means put open interest rivals call open interest, and most of that put OI is written, not bought: sellers collecting premium who now have a financial interest in the stock staying above their strikes. In an uptrend that behaves like a floor being defended. The same ratio in a downtrend reads very differently — panic hedging — which is why the trend filter is not optional.

Category: [Derivatives](https://patternsradar.com/scans/derivatives.md). Default universe: top 500 NSE stocks by 20-day turnover.

The rendered page runs this scan against the latest session and can replay it across the last 250 sessions to measure its hit rate: https://patternsradar.com/screener/put-support.