Market Data Quality for Bond Markets

An evaluated price is not necessarily a recent trade

Many fixed-income securities do not produce a fresh observable trade whenever a reader checks a screen. A service may show an evaluated price derived from available inputs and a pricing method rather than a transaction at that exact level. Treat the label and timestamp as part of the number; do not describe an estimate as an execution.

A trade print and an evaluated value answer different questions. A print records a reported transaction under its applicable rules; an evaluation may provide a value for a security with limited recent activity. Differences can reflect timing, size, side, instrument features, or methodology instead of an error by one provider.

Freshness and reporting coverage set the limits

Check when a value was observed or calculated, when the source last refreshed, and whether the page identifies a delay. A stale quote may still be useful as historical context, but it should not be presented as the price available for a new order. The required level of caution rises when markets move quickly or a security trades infrequently.

Trade-reporting systems such as TRACE may help researchers examine eligible reported transactions, but coverage, timing, and instrument treatment depend on the applicable reporting rules. Do not infer that a missing print means no trading occurred, or that one report represents every dealer's current market. Confirm the system's scope before drawing a completeness conclusion.

Interpolated curves are constructed reference points

A published yield curve usually summarizes selected observations by maturity; it does not provide a directly traded yield for every possible date. An interpolated point fills a gap between curve inputs under a chosen method. Its value therefore inherits the source observations and the provider's construction choices, which matter when comparing calculations.

Index and vendor fields can also differ in eligible securities, pricing time, accrued-interest treatment, and return calculation. Preserve the named series and methodology version instead of relying on a shortened label. For an audit trail, retain:

• Source name and the precise series or security identifier
• Observation time, calculation date, and stated delay
• Whether the value is a trade, evaluation, or interpolation
• Methodology version and any visible coverage limitation

Resolve a discrepancy through provenance

When sources disagree, compare their security identifiers, timestamps, valuation labels, and definitions before selecting a figure. A Treasury curve observation, a dealer indication, and a vendor evaluation are not interchangeable merely because each is expressed as a yield or price. Preserve the conflicting values if their difference is relevant to the analysis.

Explain which source supports each conclusion and what it cannot establish. Methodology and reporting details can vary by provider or instrument, so verify documentation before making a precise claim about a particular feed. This is educational information, not individualized investment, tax, legal, or accounting advice.