What is a data tape?
A data tape is a single, granular data file in which every individual asset in a portfolio occupies one row, with columns capturing the attributes a buyer needs to value it. In a loan portfolio sale, each row is a loan — its balance, rate, term, borrower characteristics, payment history, and delinquency status. In other contexts the rows might be individual accounts, leases, or customers.
The name is a holdover from when such data was delivered on magnetic tape. Today it is a spreadsheet or database extract, but the concept is unchanged: the tape is the loan-level or account-level ground truth, the raw material a buyer's analysts build their valuation model on.
Where summary financials tell a buyer what a portfolio earns in aggregate, the data tape lets the buyer interrogate it at the individual-asset level — stratifying by risk, vintage, geography, or any other dimension to find the concentrations and the soft spots the averages hide.
How a data tape is used
For any portfolio transaction — loan books, lease portfolios, receivables, or large customer bases — the tape is the central analytical artifact.
- Delivery. The seller provides the tape, ideally with a data dictionary defining every field, so the buyer can interpret each column correctly.
- Cleaning. The buyer validates the file — checking for missing values, duplicate rows, and fields that don't reconcile to the reported totals.
- Stratification. The buyer slices the portfolio by vintage, credit grade, geography, balance band, and delinquency to understand its composition and concentrations.
- Modeling. Cash flows, loss assumptions, and pricing are built bottom-up from the tape, then aggregated to a portfolio value and bid.
The integrity of the tape is everything. A tape with inconsistent definitions, stale fields, or rows that don't sum to the reported totals forces the buyer to discount for uncertainty — or to widen the price to cover the risk that the data is hiding something.