How Options Are Created(and Why Open Interest & Volume Actually Matter)

    Options don't just "appear" — they're created the moment someone is willing to sell them. Here's the real mechanics + why OI and volume are your best friends as a retail trader.

    Step 1 – Someone Writes (Sells) the Option

    Every single options contract starts when a trader (or market maker) clicks "Sell to Open".

    That act literally creates a brand-new contract out of thin air.

    No central bank, no company issuing shares — just a promise between two parties.

    Open Interest = Total Live Contracts

    OI counts how many contracts are currently open across all traders.

    OI goes UP when new contracts are created
    OI goes DOWN when contracts are closed or expire

    Volume = Contracts Traded Today

    Volume resets to zero every morning. It simply tells you how many contracts changed hands today.

    High volume = tight spreads & easy entry/exit

    Live Example – Watch OI and Volume Move

    Imagine the TSLA $800 Call expiring this Friday:

    Scenario 1 – Brand New Strike

    Monday morning: OI = 0

    Market maker sells 500 contracts to retail traders →

    Volume = 500 | OI = 500

    Scenario 2 – Closing Trades

    Wednesday: 300 of those buyers sell to close →

    Volume = 300 | OI drops to 200

    Key Rule

    New contracts created → OI ↑
    Contracts closed or expired → OI ↓
    Volume just counts today's activity (resets daily)

    Rising Open Interest + Rising Price = Strong Conviction

    When price is going up and OI is increasing → big players are adding new positions, not just closing old ones.

    Very bullish signal for calls (and bearish for puts).

    High Volume = Liquidity = Your Best Friend

    • ✓ Tighter bid-ask spreads (save real money)
    • ✓ Easier to get filled at fair prices
    • ✓ Less slippage when entering or exiting
    • ✓ Market makers are actively quoting

    Rule of thumb: Never trade options with volume under ~500–1,000 contracts/day unless you love overpaying.

    Open Interest & Volume Cheat Sheet

    OI ↑ + Price ↑

    New money entering = strong trend

    OI ↓ + Price ↑

    Short covering or profit taking

    High Volume

    Liquidity → easy & cheap trades

    Low Volume

    Wide spreads → expensive & risky

    Bonus: Open Interest = Real Liquidity Zones

    Yes — the strikes with the highest OI are where the market actually breathes.

    Open Interest LevelWhy It Creates LiquidityWhat You'll Actually See
    Very High OI
    (15k–50k+ contracts)    		Market makers & institutions are heavily hedged here• $0.05–$0.15 spreads
    • Instant fills
    • Price magnet / pinning zone
    OI Clusters / WallsGamma hedging creates support & resistanceStock gravitates to max-pain strike on OPEX
    Rising OI on new strikesBig money opening fresh positionsLiquidity appears in 1–3 days
    Very Low OI
    (< 100 contracts)    		Nobody is hedging → market makers quote wide• Huge spreads
    • Slippage city
    • Avoid!

    Practical Rules Most Pros Actually Use

    1

    Never fight the largest OI strike on expiration week → extreme pinning risk

    2

    Only trade strikes with ≥ 1,000–2,000 OI for decent fills

    3

    Watch OI migration → liquidity (and price) follows the new big OI strike

    4

    0DTE & weekly traders live by OI heatmaps (bright = liquid paradise)

    TL;DR → Highest Open Interest = True Liquidity Zone

    Volume tells you what's hot today.
    OI tells you where the market is actually parked and breathing.

    Live Tracker: Open Interest & Volume

    Live Option Chain Activity

    Open Interest (OI)
    12,450
    Total active contracts
    Volume Today
    8,945
    Contracts traded
    Live market data (simulated)

    How to read:

    • OI up → New positions being opened
    • Volume > OI → Day trading or closing
    • OI = Volume → Likely all new openings

    Key Concepts

    TermMeaning
    Open InterestTotal number of active contracts (not closed or expired)
    VolumeNumber of contracts traded today
    OCCCentral clearer — guarantees every option trade
    Market MakerProvides liquidity — quotes bid/ask for all strikes

    Pro Tip:

    High OI + low volume = institutional holding. High volume + rising OI = momentum building.

    Quick Quiz (3 Questions)

    1. Who guarantees the option contract?

    2. Open Interest increases when:

    3. True or False: You can lose more than your premium if you're the buyer.

    See real OI & volume in action — free paper account.

    Open Paper Account

    How Options Are Created FAQ

    Apply This on Treeova

    Understanding how options are created helps you read open interest and liquidity signals. Here's how to use that on Treeova.

    1

    View Options Chains

    Open the Trading Workspace and pull up an options chain to see open interest and volume at each strike.

    2

    Identify Institutional Activity

    Look for strikes with unusually high open interest — these often represent key support/resistance levels.

    3

    Create Monitoring Alerts

    Use the prompt-based strategy builder to monitor open interest changes on strikes you're watching.

    💡 Example Prompt

    "Monitor SPY options and alert me when open interest at any single strike increases by more than 10,000 contracts in a single day."

    Try it Now →Learn More →

    Last updated: November 06, 2025

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