Market Making
Introduction
Market making involves continuously quoting both bid and ask prices for a security, providing liquidity to the market. Kdb+'s speed and efficiency make it a suitable platform for developing market making algorithms. This chapter explores the core components of a market making system using kdb+.
Data Acquisition and Processing
High-quality, low-latency market data is essential for effective market making.
Code snippet
// Define a table schema for market data
market_data:([]sym:symbol;time:`times$;bid:float;ask:float;bid_size:int;ask_size:int;last_price:float;last_size:int)
// Function to handle incoming market data
handle_market_data:{[data]
// Parse incoming data
parsed_data:parse_data[data]
// Insert data into market_data table
market_data insert parsed_data
// Update market maker's internal state
update_market_maker_state[parsed_data]
}
Order Book Management
Efficiently managing the order book is crucial for market making.
Code snippet
// Define an order book table
order_book:([]sym:symbol;side:`buy`sell;price:float;size:int;order_id:int)
// Function to submit a market order
submit_market_order:{[sym, side, size]
// Generate order ID
order_id:next order_id
// Insert order into order book
order_book insert ([]sym;side;0f;size;order_id)
// Send order to exchange
send_order[order_id]
}
Inventory Management
Controlling inventory levels is essential for managing risk.
Code snippet
// Calculate net inventory
net_inventory:sum order_book[`size] where side=`buy - sum order_book[`size] where side=`sell
// Adjust quotes based on inventory levels
adjust_quotes:{[net_inventory]
// Adjust bid/ask prices and sizes based on inventory
}
Pricing Model
A robust pricing model is fundamental for profitable market making.
Code snippet
// Simple pricing model based on bid-ask spread
pricing_model:{[market_data]
mid_price:(market_data[`bid] + market_data[`ask]) / 2
spread:target_spread
bid:mid_price - spread / 2
ask:mid_price + spread / 2
[bid; ask]
}
Risk Management
Market makers face various risks, including inventory risk, market risk, and operational risk.
Code snippet
// Calculate VaR for inventory
inventory_var:quantile[0.05] net_inventory * avg price
// Monitor market volatility
volatility:dev price from market_data
Order Lifecycle Management
Efficiently managing the order lifecycle is crucial for minimizing costs.
Code snippet
// Function to handle order fills and cancellations
handle_fill_or_cancel:{[order_id, status]
// Update order book
// Update inventory
// Calculate profit/loss
}
Performance Optimization
Low latency is essential for market making.
Use in-memory databases.
Leverage vectorized operations.
Optimize data structures.
Minimize network latency.
Conclusion
Market making is a complex and challenging endeavor. Kdb+'s capabilities make it a suitable platform for building high-performance market making systems. By effectively managing order book, inventory, and risk, market makers can improve profitability.
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