How to Close Part of an OKX Futures Position?

Understanding Partial Position Closure Mechanics

1. OKX futures contracts support partial closure through standard order placement, not via dedicated 'partial close' API endpoints.

2. The position size reduction is determined solely by the order quantity submitted—no special flags or parameters are required.

3. Users must ensure their order quantity does not exceed the current open position size; exceeding triggers an error response with code 51000.

4. Both market and limit orders function identically for partial closure, with execution depending on prevailing liquidity and price conditions.

5. Partial closure preserves the original position’s average entry price, leverage setting, and margin mode—only the position size changes.

Step-by-Step Execution Workflow

1. Retrieve current position details using AccountAPI.get_positions() to confirm instrument ID, side, and available size.

2. Calculate desired reduction amount based on base asset units—not USD value—to avoid rounding inconsistencies.

3. Construct a new order with side opposite to the open position (e.g., “sell” for long positions) and exact sz value.

4. Submit via TradeAPI.place_order() with tdMode matching the position’s margin mode (cross or isolated).

5. Verify success by checking the returned ordId and confirming updated position size in subsequent get_positions() calls.

Order Type Selection Criteria

1. Market orders execute instantly at best available price but may incur slippage during high volatility or low depth.

2. Limit orders guarantee price control but risk non-execution if the specified price deviates significantly from mid-price.

3. Post-only limit orders prevent unintended taker fees but require precise price placement relative to order book top.

4. Trigger orders (stop-market, take-profit) enable automated partial closure upon technical condition fulfillment.

5. Trailing stop orders dynamically adjust trigger price as market moves favorably, preserving gains while allowing partial exit.

Margin and Risk Implications

1. Partial closure reduces used margin proportionally, freeing up collateral for new positions or risk mitigation.

2. Liquidation price recalculates immediately after closure, shifting higher for longs and lower for shorts due to reduced position size.

3. No impact occurs on unrealized PnL calculation methodology—the formula remains (markPrice - avgPx) posSize contractMultiplier.

4. Funding fee obligations scale linearly with remaining position size; no retroactive adjustments apply to past periods.

5. Isolated margin positions retain their assigned initial margin after closure, while cross margin positions reallocate freed margin across all active positions.

Frequently Asked Questions

Q: Can I partially close a position using a trailing stop order?Yes. Trailing stop orders support partial closure when configured with a specific sz parameter. The order executes as a market order once triggered, reducing only the specified quantity.

Q: Does partial closure affect my position’s entry time or trade history?No. The original opening timestamp and transaction ID remain unchanged. Only the position size field updates in the position object; historical fills are preserved separately in trade history.

Q: What happens if I submit two simultaneous partial close orders for the same position?The first order processes normally. The second fails with error code 51000 if its size exceeds the newly reduced position balance after the first order settles.

Q: Can I use OCO (One-Cancels-the-Other) orders for partial profit-taking and stop-loss?OKX supports OCO only for spot markets. Futures users must implement equivalent logic manually via separate conditional orders or WebSocket event listeners monitoring mark price movements.