# What is options flow? > Options flow is the stream of individual options trades as they print, showing the strike, expiry, premium, size and side of each one. People watch it to see where money is being positioned, then check each trade against the stock price, the day’s volume and the open interest before reading anything into it. - Canonical page: [https://caymanbot.com/what-is-options-flow](https://caymanbot.com/what-is-options-flow) - Content type: guide - Last reviewed: 2026-09-29 - Publisher: CaymanBot, LLC ## Quick answer Options flow is the stream of individual options trades as they print, showing the strike, expiry, premium, size and side of each one. People watch it to see where money is being positioned, then check each trade against the stock price, the day’s volume and the open interest before reading anything into it. ## Key points - **One trade at a time:** Each print shows a contract, a price, a size and a side. Premium is price × 100 × contracts. - **Size needs context:** Compare the contracts traded with the open interest already there before you call a trade unusual. - **A print is not a plan:** One trade can be a bet, a hedge or a close. Look for the pattern, not the headline. ## A real example: one AAPL put, field by field Here is a past trade from the options tape, used only as an example. The contract has already expired. On September 9, 2026 at 15:58 ET, 193 contracts of the AAPL September 18, 2026 $317.50 put traded at $6.75, labeled bought to open (BTO). The quote was $6.60 bid and $6.85 ask. AAPL was at $315.55, so the put was already in the money, with 9 days left to expiry. - Ticker and type: AAPL, put. A put gains value as the stock falls. - Strike: $317.50. The price the put lets its owner sell AAPL shares at. - Expiry: September 18, 2026. After that date the contract is gone. - Size: 193 contracts. One contract covers 100 shares. - Price: $6.75. The quote was $6.60 bid / $6.85 ask, so the midpoint was $6.725. This fill sits just above the middle, leaning only slightly toward the ask. - Side: labeled bought to open (BTO). That’s the feed’s read of a buyer starting a new position. Whether a trade opens or closes a position is inferred, not printed on the trade. - Premium: $6.75 × 100 × 193 = $130,275. ## Bid, ask and what the fill price hints at The ask is the lowest price sellers will take right now, and the bid is the highest price buyers will pay. A trade that fills at or near the ask usually means the buyer was the one in a hurry, paying up instead of waiting. A fill near the bid points the other way, to a seller. It is a strong hint, not proof. A fill near the middle, like this AAPL put at $6.75 against a $6.725 midpoint, tells you little about who was in a hurry. Premium is the total cash that changed hands: the option price, times 100 shares per contract, times the number of contracts. That is how a $6.75 option becomes a six-figure trade. ## Size vs open interest: is it unusual? Open interest is the number of contracts already open before today’s trading. Volume is how many traded today. The [volume vs open interest guide](/options-volume-vs-open-interest) covers both in depth. Before this print, the $317.50 put had 2,079 contracts open, and the day’s volume shown with this print was 1,119. 193 contracts is under 10% of what was already open (about 9%). That is real money, but it is not new positioning big enough to stand out. It is a modest trade, not unusual activity. A BTO put is also not automatically a bet that AAPL falls. Someone who owns AAPL shares might buy puts as insurance. That is a hedge, and on the tape it looks the same. So what does unusual mean? In plain terms: size that is large compared with the contract’s open interest and its normal daily volume, traded on the ask or the bid side, often in a contract with a short time to expiry. The classic tell is a single trade bigger than the open interest itself, because that many contracts cannot all be closing old positions. The [unusual options activity page](/unusual-options-activity) goes further. ## The common mistake: a $1 million trade that is less than it looks Another past example from the same expiry. On September 2, 2026 at 11:55 ET, 600 contracts of the AAPL September 18, 2026 $310 call traded at $17.15 against a $17.10 bid / $17.35 ask (midpoint $17.225), so near the bid, labeled sold to open (STO). Premium: $17.15 × 100 × 600 = $1,029,000. A headline would call that a $1M call trade and a bullish sign. Look closer. The fill near the bid points to a seller, and selling a call is not a bet that the stock goes up. The $310 call also had 20,252 contracts open, so 600 is about 3% of that. Big premium does not mean bullish, and it does not mean unusual. ## Common mistakes when reading options flow Most flow mistakes come from reading one number and skipping the rest. When you want the full checklist, the [how to read options flow guide](/how-to-read-options-flow) goes deeper on sweeps, spreads and multi-leg orders. - Treating every big print as a directional bet. Many are hedges, one leg of a spread, or someone closing a position. - Ignoring the side. Bought to open (BTO) and sold to open (STO) on the same contract mean opposite things. - Chasing after the fact. By the time you see a print, the price it filled at is gone, and the move may be over. - Reading one print instead of the pattern. Repeated trades in the same strike and expiry say more than one big trade. - Skipping open interest. A size that looks big can be small next to what is already open. ## Where CaymanBot fits CaymanBot shows options trades with their strike, expiry, premium, size and side, next to volume and open interest. The Free plan shows options data delayed 60 minutes and never expires, and you get a $100K paper balance to practice with. In the first two Learning Mode stages, each trade on the feed comes with a plain-English sentence you can check against the strike, expiry and premium. Real-time options flow is on Premium, for users who complete the OPRA non-professional attestation. CaymanBot, LLC receives consolidated options market data as a licensed OPRA vendor. Real-time options data is delivered to Premium subscribers who have completed the OPRA non-professional attestation; Free-plan data is delayed and conspicuously labeled as delayed. [Start on the Free plan](/start?utm_source=what-is-options-flow&utm_medium=aeo&utm_campaign=push-2026-10) and read your first prints on delayed data. Educational only, not financial advice. Market data is for informational purposes only. Trading involves substantial risk of loss. ## Primary sources - [Options Industry Council: Open Interest, Why It Matters](https://www.optionseducation.org/news/open-interest-why-it-matters) - [Options Industry Council: Understanding the Bid and Ask Prices for Options](https://www.optionseducation.org/news/understanding-the-bid-and-ask-prices-for-options) ## Frequently asked questions ### What is options flow? Options flow is the stream of individual options trades as they print, showing the strike, expiry, premium, size and side of each one. Traders watch it to see where money is being positioned. ### Is options flow free? Yes. On CaymanBot, the Free plan shows options data delayed 60 minutes and never expires. ### What is unusual options activity? It is options trading that is large compared with the contract’s open interest and normal volume, usually on the ask or bid side and often in a short-dated contract. A single trade bigger than the open interest is the classic tell. ### Does a big call trade mean the stock will go up? No. The call may have been sold rather than bought, it may be a hedge or one leg of a spread, and even a real bet can be wrong. ### Where should a beginner start with options flow? Pick a ticker you know and read a few prints field by field: strike, expiry, premium, size and side, then compare the size with open interest. Practice on delayed data and a paper account before you risk real money. ### Is options flow delayed? It depends on your data plan. On CaymanBot, real-time options flow is on Premium for users who complete the OPRA non-professional attestation, and the Free plan is delayed 60 minutes. ### What do BTO and STO mean? BTO means bought to open (a buyer starting a new position) and STO means sold to open (a seller starting a new position). Both are labels our feed infers, not facts reported on the trade. ## Related CaymanBot resources - [How to read live options flow](https://caymanbot.com/how-to-read-options-flow) - [Find unusual options activity in live options flow](https://caymanbot.com/unusual-options-activity) - [Options volume vs open interest](https://caymanbot.com/options-volume-vs-open-interest) - [Options flow glossary: the tape, translated](https://caymanbot.com/options-flow-glossary) - [What is an options sweep?](https://caymanbot.com/options-sweep) Market data, modeled analytics, calculators and public-filing summaries are informational. Verify time-sensitive data and original filings before making decisions.