The spike in purchases is the highest since June 2009.
In November, the GSE purchased or guaranteed $46.6 billion in single-family refinancings, compared to $37.2 billion in October.
The November activity report also shows the secondary market agency issued $59.9 billion in Participation Certificates, up 32% from the previous month.
Meanwhile, Freddie Mac’s purchases of PCs for its own investment portfolio fell to $9.4 billion in November from $15.3 billion in the prior month.
The serious delinquency rate on Freddie’s guaranteed single-family mortgage portfolio dropped six basis points in November, following a similar six basis point drop in October.
The percentage of single-family loans that are 90 days or more past due fell to 3.25% in November. A year ago, Freddie’s serious delinquency rate was 3.57%.