ICVT offers modest differences from its State Street rival, CWB. The fund can hold smaller issues (250M vs. 500M minimum) and screens out certain kinds of convertibles (mandatory, preferred, and zero coupons). Investors with a nuanced view of the space might appreciate having a choice in exposure. By design, convertible bonds hold equity-like upside while tending to fare well when rates rise. However, they carry more credit risk and are much more volatile than a diversified, total-market bond portfolio.