Credit spread surface

A credit spread surface is a multi-dimensional view of where credit risk is being priced across an asset class at a single point in time. Conceptually, it's a 3-D plot: rating bucket on one axis, maturity bucket on another, spread (the premium over a benchmark rate) on the third. Once you can see the surface, every individual loan can be scored against it: a loan whose spread sits above the surface for its rating + maturity is "cheap" (offers more compensation than peers), and a loan below the surface is "rich" (less compensation than peers).

Spread surfaces matter for portfolio analysis because absolute spreads don't tell you much — a 700bp spread might be normal for a B-rated 5-year loan but expensive for a BB-rated 2-year. You need the cross-sectional comparison to know whether a position is well-priced. Equally important, surface deviations are usually transient: a loan that's priced above the surface tends to drift back toward it over time as the market re-prices, which gives analysts a way to forecast mark direction.

Building a spread surface by hand is slow work: you need spread, rating, maturity, and seniority for hundreds of loans observed at the same period-end, sourced from filings running to hundreds of pages each. SpreadVista builds the BDC spread surface from the filings themselves — reading spread, rate floor, reference rate, and instrument type out of the Schedules of Investments it ingests — and scores each of those positions against it. Positions whose filer never tagged a spread cannot be placed on the surface, and are excluded rather than estimated.

The spread surface is also the foundation for cross-vehicle analysis: when a credit is held by multiple BDCs or funds, the spread surface lets you compare how each manager is being compensated for the same underlying credit risk, which is one of the cleanest views of relative-value mismatches in the asset class.