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Here is a comprehensive analysis of the Top 20 Spec Pool Issuers (Fannie Mae & Freddie Mac) over the last 12 months, ranked by total issuance volume, with a breakdown of Generic TBA vs. Spec Pool creation.

UWM leads all issuers with $94.8B in total origination balance, followed by Quicken at $85.2B and PennyMac at $67.5B. These three mega-originators collectively account for the lion’s share of GSE MBS issuance.

Nationstar is the most TBA-oriented issuer at 78.3% generic, followed by PennyMac (73.1%), CMG Financial (71.8%), and Quicken (68.8%). Movement Mortgage (67.8%) and New Residential (63.6%) also skew heavily toward generic TBA delivery.

Lakeview stands out as the most spec-pool-oriented issuer at 60.9% spec, followed by “Other” aggregated sellers (57.4%), Citizens Bank (54.3%), Chase (53.5%), and Truist Bank (50.2%). These issuers are more active in creating spec stories — low loan balance, high geographic concentrations — which command pay-ups in the TBA market.

US Bank (50.9% / 49.1%), Guild Mortgage (51.8% / 48.2%), and Truist Bank (49.8% / 50.2%) maintain a relatively balanced mix.

• The top 3 issuers (UWM, Quicken, PennyMac) are all non-bank mortgage companies with efficiency-driven origination models — consistent with their TBA-heavy delivery profiles.
• Bank issuers (Chase, US Bank, Truist, Citizens) tend to have higher spec pool ratios, likely reflecting their ability to curate pools with specific characteristics for better execution.
• Lakeview’s high spec pool ratio is notable given its focus on servicing-retained strategies.