Forty-two companies have raised $2.9 billion in IPOs so far in 2013, with 17 bringing in $1.3 billion in the third quarter. Thirty-one of the 42 are up from their initial valuations. Three of these - cancer stem cell play Stemline Therapeutics Inc. (NASDAQ:STML), cancer vaccine company Immunicum AB (SSE:IMMU) and Japanese peptide discovery company PeptiDream Inc. (Tokyo:4587) - have more than quadrupled in market cap.

Thirteen of 17 IPOs