Reading today’s session…
Unusual options activity updated every trading day
Spot unusual options activity while it’s still building.
Xeros reads every US options chain after the close and ranks the contracts whose open interest keeps climbing, session after session — the positions traders are adding to, not one-off prints.
- Contracts read per session
- 1.7M+
- Stocks & ETFs covered
- 5,300+
- Price during early access
- $0
All of today’s builds →
The signal
Big trades make noise. Open interest makes the move.
A single print
A 5,000-contract sweep hits the tape and lights up every flow feed. But it might be closing an old position, hedging a book, or one leg of a spread — and by tomorrow it can be gone.
An open-interest streak
Open interest only rises when new contracts are opened and held overnight. When it climbs on one strike session after session, someone is building a position — and is still adding to it.
The read · New
Ask what it adds up to. Get it in plain English.
Every symbol’s sentiment report scores its whole options chain, factor by factor. One click turns that into a short read: what’s driving the lean, what limits it, and what would change it.
- Run a screenAny window, any filters, across every optionable US stock and ETF.
- Click AI summary on a symbolOr open its Report and press Summarize with AI.
- Read it in about ten secondsWritten only from that report’s own figures, with its caveats spelled out.
Lean bearish −21 / 100 · medium confidence
Lean bearish read: put adds chased the down move, though calls led new OI and earnings fall after the window closes.
Key points
- Put timing is the largest contributor at −15.0: 100% of delta-weighted put adds came on down days, none on up days.
- Long-dated (60+ DTE) flow is more bearish at −35% of gross, net −$2.2M, versus −12% for the full chain.
- Calls were 56% of new OI against this symbol’s usual 51%, a +3.8 contribution that pushes against the bearish read.
Caveat
- The window is two trading days, so the verdict rests on very little price history.
What would change the read
- Whether put adds continue on down days in the next sessions, which would keep put timing strongly bearish.
Generated by Xeros from Alcoa Corp’s Oct 15, 2026 report. Excerpt; not investment advice.
The product
Five ways to read the build.
- 01
Open-interest screener
Filter every listed chain by ΔOI, build multiple, volume/OI and unusual stock volume — over any window you choose.
ΔOI ≥ 1,000× ≥ 2Vol/OI ≥ 0.5AAPL 345C +2,940 1.37× - 02
Earnings positioning
Every upcoming report, next to the open interest traders stacked into the chain before the print.
MonpreTuepostWedpostThupre - 03
Crypto unusual
Perp open interest, funding and volume anomalies across 24/7 markets, scored against each coin’s own baseline.
BTC-PERP1h +3.1σ4h +2.2σ24h +1.4σ - 04
Daily leaderboard
Today’s biggest open-interest builds, sector call/put flow and a market-wide heatmap.
- 05
Sentiment read + AI summary
A bullish-or-bearish read of a symbol’s whole chain over your window, explained factor by factor — and put into plain English by AI in one click.
BearishBullish AI summaryBeta
The session
Built around the trading day.
The close
The session ends. Volume is final; open interest settles overnight.
Stock volume
Underlying volume and its 10-day and 1-year averages land, powering the unusual-volume filter.
First read
Every options chain is pulled — strikes, expiries, volume — for every optionable stock and ETF.
Settled open interest
Chains are read again before the open, after open interest updates, and every streak is re-ranked.
The open
Today’s builds are waiting for you before the opening bell.
FAQ
Questions, answered.
What is unusual options activity?
Unusual options activity is trading in a contract that is far outside its normal pattern — much more volume, or much more open interest, than that strike usually sees. It often marks a trader positioning ahead of an expected move, a hedge, or an event like earnings.
What is open interest, and why does it matter?
Open interest is the number of option contracts that are open and not yet closed. Unlike volume, it only rises when new positions are opened and held overnight. When open interest on one strike climbs session after session, someone is building a position — which is the signal Xeros is built around.
How is Xeros different from options flow trackers?
Flow trackers alert on individual large trades as they print, but a single print can be closing an old position, a hedge, or one leg of a spread. Xeros tracks open interest instead, and ranks the contracts where it keeps rising day after day — positions that were opened and are still being added to.
How often is the data updated?
Every trading day. Options chains are read after the close and again before the next open, once open interest has updated overnight, so the screener always reflects the latest completed session.
Which stocks and ETFs does Xeros cover?
Every optionable US stock and ETF — more than 5,300 symbols, and over 1.7 million contracts read each session.
Can AI summarize the options positioning in a stock?
Yes. In the screener, click "AI summary" next to any symbol, or open its Report and press "Summarize with AI". In about ten seconds you get a plain-English read of that symbol’s whole options chain over your window: what is driving the bullish or bearish lean, what limits confidence in it, and what would change it. It is written only from the report’s own figures and is included free during early access.
Is Xeros free?
Yes. Xeros is free during early access. The daily leaderboard needs no account; the screener, earnings and crypto tools need a free account.
Is Xeros investment advice?
No. Xeros provides market data and analytics for informational purposes only. Options involve risk and are not suitable for all investors.
Watch it build.
Free during early access. Make an account, run your first screen, and see what’s stacking up today.