Standard & Poor's said Monotype Imaging Holdings Inc. will replace Dionex Corp. in the S&P SmallCap 600 index after the close of trading Friday.

Dionex is being acquired by Thermo Fisher Scientific Inc., which is in the S&P 500. The deal is expected to be completed soon.

Monotype Imaging Holdings, which licenses typographic fonts to designers and manufacturers, is based in Woburn, Mass.