This excerpt taken from the NDAQ 8-K filed Feb 20, 2008.
OMX has provided guarantees for clearing related operations of a total value of SEK 4,575 million as of September 30, 2007. These bank guarantees are guaranteed by OMX by counter indemnities. OMX has also provided other guarantees of SEK 191 million, primarily related to obligations for leasing contracts and in conjunction with the IT-platform sales in Market Technology. In addition to these guarantees, there are general parent guarantees for wholly-owned subsidiaries of OMX.