Pegasystems (PEGA) will replace Nordstrom (JWN) in the S&P MidCap 400, effective prior to the opening of trading on Thursday, S&P Global Research (SPGI) said Monday.

The change is taking place because the Nordstrom family and El Puerto de Liverpool are acquiring Nordstrom and taking it private in a deal expected to be completed Tuesday, the indexing and research firm said.