Market Radar
The Market Radar flags US stocks showing unusual activity — in the options market, in insider filings or in positioning data. Open it from the Radar entry in the sidebar.
What it scans
Every day before the US market opens, Obside scans the previous session's data on S&P 500 stocks plus a curated watchlist of biotech and mid-cap catalyst names, looking for footprints that experienced traders watch closely:
- Unusually high call-option volume versus the stock's own average.
- Day volume exceeding open interest on short-dated, out-of-the-money calls — a sign of fresh positioning rather than existing positions changing hands.
- Option activity concentrated in far out-of-the-money, near-expiry calls.
- A jump in implied volatility.
- Stock purchases reported by members of the US Congress.
- Significant insider buying on the open market.
- Elevated or rising short interest.
Reading an alert
Each flagged stock appears with an alert score (0–100) that condenses the strength of its triggers, the date the alert was first detected, and the price move since detection.
Click a row to see exactly which triggers fired for that stock — and jump to its asset page for the full picture (chart, key stats, news, upcoming catalysts).
Alerts age out automatically: a stock drops off the radar after about two weeks without a new detection.
Warning
The radar is an informational signal, not a recommendation. Unusual flow has many benign explanations — hedging, rolled positions, institutional blocks — and is never proof of insider knowledge. Treat an alert as a starting point for your own research, not as a reason to trade on its own.
The Market Radar is included on every plan.