Looks like there were 9 block trades today of 10,000 shares or more. Based upon pasta's post earlier regarding INCA, it may have been the same seller. On a dollar basis, that is a lot more block trades than I can ever remember seeing for CBMI.
Since the index funds have presumably already gotten out of CRIS, the large sales may be coming from a venture capital firm that owned stock in either CBMI, Ontogeny or Reprogenises and is now free to sell. In many such instances, the reasons for selling don't have anything to do with the fundamentals of the company. Such funds may just want to lighten up, the term of a particular investment fund may be coming to an end and there is a need to distribute to the fund owners, or there may be other reasons which are particular to the fund. Perhaps someone with Level II could keep us informed next week if they see or don't see large orders coming in from a single market maker.