Standard & Poor's Ratings Services has assigned SVB Syndicates 2147 & 1007, Assigned Lloyd's Syndicate Assessments of '2'(high dependency).
The ratings agency said the outlook on the syndicates is stable.
Standard & Poor's credit analyst Matthew Day, said: "The assessments on the syndicates primarily reflect the potential drag on ongoing profits caused by the legacy business, as well as the marginal capitalization and limited financial flexibility of the syndicates' principal backer, SVB Holdings."
"These weaknesses are mitigated, however, by the syndicates' good forecast operating performance, strong competitive position, and the strong financial strength of the UK based Lloyd's insurance market."
Lloyd's is currently rated A by Standard & Poor's but it is on ratings watch negative.