The Cobblers will not receive a sell-on payment as part of the deal that took former midfielder Michael Jacobs from Derby County to Wolves.
Town were due a percentage of any profit the Rams made on the amount they paid for Jacobs in July 2012, believed to be £400,000.
But Wolves have paid less than that for the 22-year-old, who played nine games on loan at Molineux before the January transfer window opened.
It means Northampton have no sell-on clauses in place for former players, except for those who left Sixfields before signing professional terms.
“We just felt he should be playing first-team football at this stage of his career and unfortunately, with the options at our disposal, that is something we weren’t able to offer him,” said Derby head coach Steve McClaren.
“It goes without saying we wish Michael all the very best in his future career with Wolves and thank him for his contribution in a Derby County shirt.”
Jacobs made 47 appearances for the Rams and scored three goals. His final start was in the Capital One Cup victory at Oldham Athletic in August, in which he scored the winning goal.