The ratings agency has maintained a positive watch on ClearView following a strategic business simplification and the announcement of a planned A$415m acquisition by Zurich.
Roach joins from Marsh where he has worked for over 17 years, while Marsden is the broker's latest hire from Lockton, where he has worked for 14 years.
The insurance sector faces the potential for added pressure amid ongoing claims from recent NT and QLD floods, both states which could be impacted by Narelle.