Fill-or-Kill Order
An order that must execute immediately in full or be cancelled entirely.
An order that must execute immediately in full or be cancelled entirely.
How Fill-or-Kill Order works
Execution microstructure focuses on how an investment decision becomes an actual trade. The distinction matters because order instructions, routing rules and fill conditions can materially change realized cost even when the investment view is unchanged. Fill-or-Kill Order matters at the point where an order interacts with available liquidity. Its practical effect depends on the instruction's priority, the quantity available at each price, and whether the venue or dealer can execute the requested size without moving the market.
Why it matters in markets
In fixed income, many instruments still trade through dealer and RFQ workflows rather than a single consolidated order book, so execution quality often depends on protocol choice, dealer response, size and prevailing liquidity. Understanding Fill-or-Kill Order helps distinguish a fundamental repricing from a move caused primarily by execution mechanics, inventory pressure or temporary scarcity of liquidity. That distinction is important when comparing yields, spreads or prices across instruments and venues.
How to interpret it
Fill-or-Kill Order should be compared across similar instruments, trade sizes and market regimes. A value that looks favorable in normal conditions may deteriorate rapidly when volatility rises or dealer capacity contracts. Cross-sectional comparison is usually more informative than reading the measure in isolation.
Limits and context
Microstructure measures are highly sensitive to market design and data quality. Public feeds may omit hidden interest, bilateral dealer negotiations or delayed reports, while definitions can vary across venues and jurisdictions. BondStats therefore treats Fill-or-Kill Order as a structural concept rather than a universal trading rule, and users should defer to the relevant venue, regulator or instrument documentation for binding definitions.
Independently written BondStats reference content. Venue rules, regulatory definitions and official instrument documentation remain authoritative where terminology differs across markets.