Markit's new synthetic total return swaps ndex — Markit IOS Index —  appears to have seen good participation on its first day, Barclays Capital analysts said.

The initial launch consisted of sub indices referencing the interest component of FNCL 2009 vintage 4s, 4.5s and 5s. Additional sub indices, including for FHLMC Gold and GNMA, will be launched on a semi-annual basis with the next date scheduled for Sept. 12.

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